Foot valve assembly

Abstract

The disclosure relates to a foot valve assembly for use with an elongated pipe for encapsulating a removably arranged pump with components within a container, such as a fuel tank The elongated pipe comprising at least a first opening at a proximal end and at least a second opening at a distal end. The foot valve assembly being arranged at the distal pipe end and configured to close off flow and to open to let flow into the pump.

Description

[0001] FOOT VALVE ASSEMBLY

[0002] FIELD OF THE INVENTION

[0003] The present disclosure relates to a foot valve assembly for use with an elongated pipe for encapsulating a removably arranged impeller within a container for storing any type of liquid fuel. More specifically, the disclosure relates to a foot valve assembly for use with an elongated pipe for encapsulating a removably arranged impeller within a container for storing any type of liquid fuel as defined in introductory parts of the independent claims.

[0004] BACKGROUND OF THE INVENTION

[0005] Containers or tanks used for offshore and onshore industry when transporting liquified fuel uses pumps for loading and / or supplying fuel into the containers and / or out of the containers. The pumps, or at least the impeller of the pump, are commonly removably arranged in elongated pipes or caissons comprising valves for sealing off and / or opening the inlets to the pump. In order to achieve fossil fuel free society, the Power-to-X industry (PtX) is an essential element. There is also a need for fuels for ships, trucks, and for those parts of manufacturing industry that cannot immediately be electrified. Typically, liquified gas such as liquid petroleum gas (LPG), liquified natural gas (LNG), methane, ethane, propane, methanol, ammonia, LCO2, and liquified nitrogen (LiN) is pumped from the tank to the engine that consumes it. To enable pump maintenance without having to empty the container or tank of fuel, a valve shut-off mechanism is usually installed at a sump support and pipe support at, on, or close to the bottom of the container.

[0006] Previous solutions are related to foot valves using movable plates to open and close the inlet at the end of the elongated pipe or caisson. Foot valves operate similarly to check valves using a disc that seats against a bottom inlet orifice, thereby preventing any flow through the orifice. The disc is held against the seat by its own weight and, in some cases, by a closing spring. When the pressure difference on the two sides of the disc is sufficiently high, the disc is lifted from the seat, allowing flow through the orifice. In some cases, springs are used to keep the valve open, which can disturb the inlet flow and compromise the Net Positive Suction (NPSH) required for the pump. An example of a foot valve solution with a movable plate is disclosed in EP 3 377 803 Bl. Additionally, securing such springs and ensuring they function correctly presents another challenge.

[0007] SUMMARY OF THE INVENTION It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above-mentioned problem.

[0008] In a first aspect of the invention, the invention relates to a foot valve assembly for use within a container, such as a fuel tank. The foot valve assembly comprises:

[0009] - an elongated pipe comprising a first opening at a first end and a radial fenestration defining a fluid inlet arranged at a second end. The elongated pipe encloses an impeller arranged at the second end.

[0010] - a valve casing comprising a first sealing surface and a second sealing surface for impermeably contacting the elongated pipe.

[0011] The valve casing is configured to be displaceable along the longitudinal axis of the elongated pipe between a first position and a second position. In the first position, both the first and second sealing surface is arranged on the same side of the radial fenestration along the longitudinal axis of the elongated pipe. In the second position, the first sealing surface and the second sealing surface are located across from the radial fenestration along the longitudinal axis of the elongated pipe. The first and second sealing surface are configured to exert a sealing force against at least a portion of the surface of the elongated pipe normal to the longitudinal axis of the elongated pipe. The first and second sealing surface of the valve casing impermeably covers at least the radial fenestrations when the valve casing is in the second position.

[0012] The foot valve assembly has the technical effect of closing off flow through the fluid inlets and to the impeller, so that the pump and other upstream components can be isolated from the fluid in the tank. The radial fenestration allows a fluid to enter the elongated pipe, such as when suction is provided by the impeller. Having the fluid inlet as radial fenestrations facilitates better flow of the fluid into the inlet. The radial fenestrations should have an area at least 3-4 times greater than the pump suction area to avoid impeding the flow. The first and second sealing surface of the valve casing facilitates that the fluid inlet is impermeably closed off from the fluid in which the foot valve assembly is submerged, thereby preventing fluid from entering the inlet. By moving the valve casing, with the sealing surfaces, along the longitudinal axis of the elongated pipe (e.g., in parallel with the elongated pipe), the technical effect of scraping the contact area between the sealing surfaces and the elongated pipe is facilitated. This facilitates that the sealing contact is free from debris, impurities or other solids that could prevent an impermeable sealing. The sealing force exerted by the first and second sealing surface against the surface of the elongated pipe facilitates the impermeable contact between the sealing surfaces and the elongated pipe.

[0013] The first sealing surface may be configured to impermeably contact at least a portion of the surface of the elongated pipe in the first and the second position of the valve casing. This facilitates the technical effect of preventing impurities, debris, and / or solids from entering / falling down between the first and second sealing surfaces. It further facilitates the effect that as the first sealing surface remains in constant contact, it acts as a guide that helps maintain coaxial alignment between the valve casing and the caisson pipe.

[0014] The valve casing may be actively actuated, such as by an electromotor, pneumatic actuator and / or a hydraulic actuator. This facilitates the technical effect of opening and closing the fluid inlets by actuating the valve casing between the first position and the second position without relying on passive forces. The active actuation may be the sole source of actuation force, apart from gravity.

[0015] The valve casing may be actuated by an at least partially threaded actuation rod extending through a threaded nut, so that the actuation rod moves translationally when the nut and / or actuation rod is rotated. This facilitates the technical effect of converting rotational movement to translational movement. Thereby it is possible to use standard electromotors instead of more complicated linear actuators. This may ease the manufacturing and maintenance of the foot valve assembly.

[0016] The valve casing may enclose the second end of the elongated pipe. This facilitates the technical effect of ensuring that the valve casing achieves a good sealing fit at least when in the second position. It further facilitates that the valve casing is more easily accessible for maintenance.

[0017] The valve casing may comprise at least one spring-energized seal for biasing the first and / or second sealing surface to exert a / the sealing force against at least a portion of the surface of the elongated pipe normal to the longitudinal axis of the elongated pipe at least when the valve casing is in the second position. The spring-energized seal may be energized by a circumferentially extending and / or expanding and / or biased spring, a helical spring, a U-spring or by various elastomeric materials. This facilitates the technical effect of supporting and / or reinforcing the impermeable contact between the sealing surfaces and the elongated pipe. The spring-energized seal also facilitates the technical effect of adjusting a circumference of the first and second sealing surface in response to thermal expansion and / or contraction of the elongated pipe and / or the valve casing.

[0018] The first sealing surface and the second sealing surface may be arranged on the spring energized seal and / or be part of the spring energized seal and / or form the spring energized seal. This facilitates the technical effects of utilizing a spring-energized seal in a simpler construction. This facilitates that the foot valve assembly is easier to manufacture and maintain. This further facilitates the technical effect of supporting and / or reinforcing the impermeable contact between the sealing surfaces and the elongated pipe. The spring-energized seal also facilitates the technical effect of adjusting a circumference of the first and second sealing surface in response to thermal expansion and / or contraction of the elongated pipe and / or the valve casing. Thus, the sealing is improved and made more robust and repeatable / reproducible.

[0019] The valve casing may be configured so that at least a portion of the valve casing, such as the first sealing surface and / or the second sealing surface, scrape(s) against at least a portion of the surface of the elongated pipe when moving between the first and second position. This facilitates that the sealing contact is cleared from debris, impurities or other solids, even rust and / or ice, that could prevent an impermeable sealing. Notably this may therefore be achieved without adding further steps or components.

[0020] The valve casing may be arranged between the elongated pipe and a strainer in a direction normal to the longitudinal axis of the elongated pipe. The strainer facilitates that impurities, debris and / or solids in the fluid do not enter / flow into the inlet. This facilitates that such impurities or debris does not clog the inlets or other components downstream of the inlets. This arrangement facilitates the technical effect of the strainer protecting the sealing surfaces from debris, impurities and / or solids that could compromise the impermeable contact between the first and second sealing surface and the surface of the elongated pipe.

[0021] At least the edges of the radial fenestration running normal to the longitudinal axis of the elongated pipe may be chamfered edges. This facilitates the technical effect of guiding the second sealing surface toward the surface of the elongated pipe, and smoothens the engagement of the second sealing surface and the transition over and onto the surface of the elongated pipe again after having passed across the radial fenestrations. This facilitates a proper sealing fit and reduces the risk of the sealing surface catching on to an edge of the radial fenestration, this could otherwise compromise the sealing fit and / or tear the sealing surface. This further facilitates the technical effect of preventing the sealing surfaces from catching on to a sharp edge which could cause them to tear and / or wear prematurely / excessively, in particular as the sealing surface may be biased radially inwards towards the centre of the elongated pipe. This further has the technical effect of making it easier to slide the second sealing surface across the fenestration while ensuring a press fit to the elongated pipe when the second sealing surface is across the radial fenestration relative to the first sealing surface.

[0022] A surface normal to the longitudinal axis of the elongated pipe and arranged at the second end of the elongated pipe and facing towards the first end, may be sloped with a decline from a centre of the surface and towards the radial fenestration(s). This facilitates the technical effect of draining the elongated pipe from fluid when the foot valve assembly is no longer submerged in the fluid. This design further facilitates effective draining of the elongated pipe when the foot valve assembly is activated. Specifically, the downward slope from the centre radially and / or circumferentially outward ensures that the bottom components do not create any dead volume, allowing the pump, impeller, and / or elongated pipe to be fully emptied or stripped before maintenance. As a result, the entire fluid can drain out easily and completely from the pump and elongated pipe structure. In some cases, this decline may form the inside of the second end of the elongated pipe as a cone with its vertex facing towards the first end of the elongated pipe.

[0023] The first and second sealing surface and / or valve casing may be comprised of a polymer material with a glass transition temperature below 0 degrees Celsius, such as below -167 degrees Celsius, such as below -196 degrees Celsius, such as below -253 degrees Celsius. This is especially important for cryogenic applications such as when handling liquefied natural gas or liquefied hydrogen. This facilitates that the sealing surfaces retain their elasticity when used with cold fluids so that they effectively provide the sealing force against the surface of the elongated pipe. The valve casing may be an open-ended pipe or cylinder. This facilitates the technical effect of making the valve casing easy to manufacture and achieve a good sealing fit around the elongated pipe.

[0024] The foot valve assembly may comprise a strainer enclosing the second end of the elongated pipe and covering the radial fenestration(s). This facilitates the technical effect of preventing impurities, debris and / or solids in the fluid from entering / flowing into the inlet(s). This facilitates that such impurities or debris does not clog the inlet(s) or other components downstream of the inlet(s), such as the impeller. This arrangement facilitates the technical effect of the strainer protecting the sealing surfaces from debris, impurities and / or solids that could compromise the impermeable contact between the first and second sealing surface and the surface of the elongated pipe.

[0025] The foot valve assembly may comprise a strainer arranged inside the elongated pipe covering the radial fenestration(s). This facilitates the technical effect of preventing impurities, debris and / or solids in the fluid do not enter / flow into the inlet(s) and continue upstream of the foot valve assembly where they may clog or damage the system or upstream components, such as the impeller.

[0026] In a second aspect, the invention relates to a system for pumping fluid from a container comprising

[0027] - a pipe, such as an inner elongated pipe, for transporting the fluid

[0028] - a foot valve assembly according to any preceding / subsequent aspect / embodiment connected to the pipe and arranged inside the container,

[0029] - a motor arranged on the outside of the container and connected to an impeller arranged within the pipe via an impeller shaft.

[0030] The system facilitates the technical effect of pumping fluid while being able to close off the components downstream of the foot valve assembly from the fluid, such as the impeller / pump. This is especially important when working with volatile, flammable, toxic, and / or explosive fluids and materials.

[0031] It is a further technical effect of the invention that the closing and sealing areas may be located further from the impeller / pump inlet or entrance compared to prior art. The invention also facilitates a decreased risk of local accumulation or jamming of impurities such as large particles, which can be present in dirty cargo / containers. Therefore, sealing is improved and made more effective in a more robust way.

[0032] The arrangement of the sealing surfaces on the valve casing also facilitates a reduction in interference with the inlet flow. It further facilitates the elimination of physical barriers near the impeller / pump suction that could distort the flow as the sealings on the valve casing are far from the suction area of the impeller / pump.

[0033] The sealing surfaces are arranged external to the impeller / pump inlet, so there is less spatial limitations on where to arrange them. There is also less restriction on the number of sealing surfaces that can be accommodated, e.g., two or three or more sealing surfaces is applicable.

[0034] The valve casing is placed outside the impeller / pump inlet, so there is more space to arrange suitable parts or mechanisms used to guide and control the movement and movement path of the valve casing.

[0035] In an alternative embodiment of the first aspect there is provided a foot valve assembly for use with an elongated pipe for encapsulating a removably arranged pump with components within a container, e.g., a fuel tank. The elongated pipe may enclose an inner elongated pipe for transporting a fluid and enclosing the impeller and impeller shaft. The elongated pipe comprises at least a first opening at a first end and at least a radial fenestration at a second end. The radial fenestration at the second end is embodied in the elongated pipe and / or in a fixed or detachable segment of the elongated pipe. The foot valve assembly is arranged at the second end and configured to open and close off flow into the impeller / pump inlet. The valve casing is movably connected to an actuator to control closing and opening of the foot valve assembly.

[0036] The foot valve assembly may further comprise a mismatch flange connection, a base, and a sealing mechanism comprising valve sealings and valve seats. The valve sealings and valve seats are displaced relative to each other when the valve casing is moved between the second position and the first position. The mismatch flange connection is defined as a pair of flanges both comprising at least one sealing element, such as a gasket and / or an energized seal wherein the gaskets and / or energized seals on the two flanges do not align when the two flanges about each other. This creates at least two impermeable sealings and / or sealing areas and thereby provides redundancy in the sealing of the foot valve assembly when closed i.e., when the valve casing is in its second position.

[0037] The valve sealings and valve seats of the sealing mechanism form at least two different valve sealing areas of which at least a first valve sealing area is configured to seal at the mismatch flange connection and is arranged closer to the first end of the elongated pipe than at least a second valve sealing area configured to seal at the base. The valve casing is configured as an outer cover, movably arranged at the second end of the elongated pipe. In the second position of the valve casing, the valve sealings and valve seats of the sealing mechanism sealingly mate at both the first and second valve sealing areas. In the first position of the valve casing, the valve sealings and valve seats of the sealing mechanism are distanced from each other providing at least one orifice enabling flow through the impeller / pump inlet. This minimizes any disturbance of the pump's inlet flow, as the sealing mechanism is positioned far from the impeller inlet, ensuring that the impeller's efficiency is not compromised.

[0038] With the sealing areas located further from the impeller / pump inlet compared to prior art, there is less possibility of local accumulation of large particles because of impurities, such as in dirty cargo / containers / fluids. Therefore, sealing is improved and made more effective in a more robust way. This is independent of the amount and / or type of dirt in the cargo, big or small dirt particles. This also reduces interference with the inlet flow, as it facilitates that any physical barrier which could distort the flow near the impeller / pump inlet is eliminated or at least much reduced since the sealing areas are distanced further from the impeller / pump inlet compared to the prior art.

[0039] The sealing surfaces are also arranged external to the impeller / pump and impeller / pump inlet, so there are less spatial limitations on where to arrange these. It is also facilitated that the number of suitable sealing surfaces can be increased, as there is also less restriction on the number of sealing surfaces that can be accommodated.

[0040] Since the valve casing is placed outside the impeller / pump inlet, there is more space to arrange parts or mechanisms for guiding and controlling the movement and the actual movement path of the valve casing. According to some embodiments, the valve casing comprises at least a first pair of first valve sealings in the first valve sealing area and at least a second pair of second valve sealings in the second valve sealing area. This improves the sealing effect further.

[0041] According to some embodiments, the sealing mechanism comprises at least one pair of valve sealings and at least one pair of valve seats in the first valve sealing area which are configured to sealingly mate. Having at least two seating areas provide a more stable and controllable movement for the valve casing. Having at least two sealing surfaces facilitates a higher probability of at least one sealing area achieving a good sealing, even if there are impurities and coarse particles obstructing the sealing in one or more other sealing areas.

[0042] According to some embodiments, the base is configured as a stationary support for the elongate pipe and / or inner elongated pipe inside the container. Having a sealing surface that is stationary and fixed to the bottom of the container may facilitate an improvement in sealing performance. It facilitates that the sealing components can be activated well, and any risk for leakage is eliminated or at least greatly reduced.

[0043] According to some embodiments, the base comprises at least the second valve sealing area and is configured to be at least partly enclosed or covered by the movable valve casing to thereby sealingly mate with the movable valve casing when the valve casing is in the second position.

[0044] According to some embodiments, the second end of the elongated pipe comprises at least one flange extending radially outwards around the circumference of the elongated pipe end and is configured to be at least partly enclosed by and to sealingly mate with the movable valve casing when the foot valve assembly is in the second position.

[0045] According to some embodiments, the at least one flange of the second end of the elongated pipe is arranged between the first end of the elongated pipe and the base of the foot valve assembly. If the flange is attached closer to the middle of the foot valve assembly and is connected to the elongated pipe, then the valve casing and the elongated pipe may be stabilized by the flange and this provides a more stable surface for the upper sealing surface thereby facilitating an improvement of the sealing quality. According to some embodiments, the at least one flange of the second end of the elongated pipe is configured as a part of the first valve sealing area. Having a bottom support that is close to the second end of the elongated pipe provides a more stable surface, which may increase the sealing quality.

[0046] According to some embodiments, the sealing mechanism comprises at least one pair of valve sealings and at least one pair of valve seats at the second valve sealing area, which pair of valve sealings and valve seats of this second valve sealing area are configured to sealingly mate. By having at least two sealing levels a more stable and stronger sealing may be achieved and thereby further reducing the risk of leakage.

[0047] According to some embodiments, the second end of the elongated pipe comprises at least one fenestrated conical wall extending in a direction being inclined relative to the second end of the elongated pipe. Alternatively, it may comprise at least one fenestrated wall with the fenestration being oriented normal to a radial direction of the elongated pipe i.e. in parallel to the longitudinal axis of the elongated pipe. Having two sealing surfaces at different orientations, such as in parallel or perpendicular, provides an advantage by further preventing any leakage in unstable or dirty conditions.

[0048] According to some embodiments, at least one of the radial fenestrations at the second end is / are through-going holes in the at least one fenestrated tubular wall. This type of hole configuration helps to ensure that an inlet flow to the impeller is not disturbed. This prevents a reduction of the Net Positive Suction Head (NPSH). NPSH is a measure of the pressure experienced by a fluid on the suction side of a centrifugal pump, e.g., an impeller.

[0049] According to some embodiments, the at least one fenestrated tubular wall is configured as an extension of the second end of the elongated pipe and / or the inner elongated pipe.

[0050] This type of configuration and length extension of the elongated pipe provides an improved sealing due to a more stable and robust sealing surface located away from the pump / impeller inlet. According to some embodiments, the at least one fenestrated tubular wall forms an inlet into the elongated pipe while also providing a connection between the at least one flange and base. This provides a more stable and sturdier configuration of both the elongated pipe and the foot valve assembly itself.

[0051] According to some embodiments, the at least one fenestrated tubular wall extends between and perpendicularly to the planes of extension of the at least one flange and the base. This type of configuration facilitates the technical effect of having a more stable sealing surface which is critical in harsh and / or unstable conditions.

[0052] According to some embodiments, the at least one flange may be configured as an upper radially extending flat enclosure of the at least one fenestrated tubular edge or wall. The base may be configured as a lower radially extending flat enclosure of the at least one fenestrated tubular wall.

[0053] By way of example, two flanges with for example four contact surfaces can be used for sealing, and the flanges are connected to each other by a solid wall that can provide fixed seats providing an improved sealing.

[0054] According to some embodiments, the second pipe end resembles a lying down spool, cable drum, or reel shape with the at least one fenestrated tubular wall being the central, cylindrical core and the at least one flange and the base being the large, flat circular ends or flanges having the base as a lower or bottom side. This provides the options of having the second end of the elongated pipe spaced at a distance from the container bottom or having the second end of the elongated pipe be in direct or indirect contact with the container bottom or even resting on the container bottom. If the second end of the elongated pipe is arranged at a distance from the container bottom, this may provide enough space for lengthwise thermal expansion / contraction of the elongated pipe when subjected to varying temperatures, i.e., cold or hot cargo. If the second end of the elongated pipe is arranged at a distance from the container bottom, this enables using a lower support that controls the movement of the elongated pipe in two directions enabling movement freely up and down in the direction of gravity. This facilitates the reduction of additional vibration of the second end of the elongated pipe and provides stable surfaces for sealing. This further improves the stability of the elongated pipe inside the container and the sealing between associated parts. It further enables the use of several supports in the pump structure such as the lower supports, middle supports, internal supports and spider supports. This is particular important for all long pumps requiring lower supports, inner supports and middle supports to ensure stability.

[0055] According to some embodiments, the movable valve casing is configured as a cylindrical open-ended pipe with one end facing upwards forming part of the at least first valve sealing area with a centre hole configured to slidably surround the second end of the elongated pipe and the other end facing downwards forming part of the at least second valve sealing area. Alternatively, the movable valve casing is configured with a cone stub shape. The larger diameter rim faces downwards, and the smaller diameter rim has a centre hole configured to slidably surround the second end of the elongated pipe. The smaller diameter rim forms part of the at least first valve sealing area and the larger diameter rim forms part of the at least second valve sealing area. Alternatively, the movable valve casing is configured as a cylinder with a flange attached at one end. The flange forming part of the at least second valve sealing area and the other end of the cylinder forms part of the at least first valve sealing area and has a centre hole configured to slidably surround the second end of the elongated pipe. This provides the valve casing with a strong structure that does not deform easily which helps to seal with a reduced risk of leakage.

[0056] According to some embodiments, the valve casing is configured as an open-ended cone stub with the larger opening facing downwards and the smaller opening facing upwards and configured to slidably surround the second end of the elongated pipe end and / or the elongated pipe. The elongated pipe is configured with a conical outer shape at the second end fitting to the conical inner shape of the valve casing. The at least first valve sealing area is configured to seal off flow at the smaller upper opening of the valve casing and the at least second valve sealing area is configured to seal off flow at the larger lower opening of the valve casing when the valve casing is in the second position. This conical configuration enables removal of any existing impurities and large particles in the cargo as the inclined surfaces help to remove the particles on the sealing surfaces, by pushing, pressing, or flushing the particles away from the surfaces with help of the cargo fluid before the surfaces sealingly engage when the valve casing is moved from the first position to the second position. Therefore, no cleaning member, special element or detail is required to clean the sealing surfaces before engaging.

[0057] According to some embodiments, the sealing areas of the sealing mechanism comprise at least two valve sealing contact areas being arranged on the valve casing and on at least one flange of the mismatch flange connection and on the base, sump support and / or on the elongated pipe. The sealing areas comprise one or more sealing elements and / or stopping and positioning components being arranged on the valve casing, a flange of the mismatch flange connection, the base or the sump support, second end of the elongated pipe, and / or the elongated pipe. In at least this configuration it is possible to increase the number of sealing surfaces from two to four or more sealing surfaces if needed.

[0058] According to some embodiments, the actuator comprises a closing mechanism comprising a rod, a wire and / or chain, configured to pull up the valve casing from the closing position to the opening position to put the valve casing at a parking or non-operative position. When using a wire and / or chain, it comprises a pulling mechanism for providing a pull in the wire and / or chain. When using a rod it comprises a nut-screw through the rod to position the valve casing.

[0059] If a pneumatic actuator is used, a reciprocating piston may be used to move the valve casing between the first and second position. Alternatively, a one-way piston may be used to move the valve casing to the second position with another mechanism to move the valve casing into the first position.

[0060] According to some embodiments, the pulling mechanism comprises one or more eyebolts, one or more rods, one or more hydraulic and / or pneumatic pistons, such as a reciprocative piston, one or more optional pipes for supply of inert gas into the foot valve assembly, one or more optional winches, and one or more wires and / or chains to move the valve casing. This provides a flexible and optional application of a suitable activation and deactivation mechanism of the foot valve according to the customer's request. Any suitable components and method for raising and lowering the valve casing can be selected based on customer request and cargo (with due consideration of the thermal load and mechanical and chemical interaction between components).

[0061] According to some embodiments, the hydraulic piston, pneumatic piston, the rod, the pipe, and / or the nut-screw is / are arranged at the second end of the elongated pipe, the elongated pipe, and / or on the valve casing. This provides a wide selection of usable mechanisms and locations of those and an improved ability to control the load applied on the sealing surfaces.

[0062] According to some embodiments, the sealing mechanism comprises at least one pair of sealing elements forming at least one pair of valve sealings and valve seats at each of the first and the second valve sealing area. Pairs of sealing elements are configured to be arranged on one or more horizontally extending surfaces of the movable valve casing and the mismatch flange connection and / or the base. Alternatively, the sealing elements are configured to be arranged on one or more vertically extending surfaces of the movable valve casing, the mismatch flange connection, and / or the base. Alternatively, the sealing elements are configured to be arranged on one or more inclined surfaces of the movable valve casing, the mismatch flange connection, and / or the base extending at an angle between horizontal and vertical orientation.

[0063] The sealing mechanism of the foot valve assembly may have at least one or two sealings arranged at any preferred orientation e.g., one or more sealings can be arranged horizontally, vertically, and / or inclined relative the other. This means that sealing can be effectively achieved even in unstable conditions. Having several sealing areas at the same or differing orientation and / or positions / heights facilitates that if one of the sealings does not work well in one place, e.g., due to obstacles hindering a sealable mating, there is a high probability that another sealing can perform well and seal, which is useful for harsh and unstable conditions. There is a low risk of all sealings being misaligned at the same time. There is also a low risk that all sealings are obstructed by non-desired particles creating leaks.

[0064] According to an embodiment of the second aspect there is provided a container for storing any type of liquid fuel, the container comprises a foot valve assembly and an elongated pipe according to any of the preceding aspects and embodiments. This enables choosing any of the different aspects and / or embodiments. Any suitable solution can be chosen based on the dimensions of the pump structure, the dimensions of the tank and any sump dimension if a sump support is present.

[0065] Based on vibration analysis of the pump, it might be needed to have mid-support(s) along the longitudinal axis of the elongated pipe, which are connected to the container and the elongated pipe to stabilize and make the supportive parts sturdier, more stable, and more durable.

[0066] The present disclosure also pertains to a system designed to make a closed volume around a pump / impeller within a fuel tank, a foot valve assembly, an elongated pipe, a mismatch flange connection, and a base or sump support connection to create an impermeable boundary around the pump / impeller. The pump / impeller is encapsulated by the foot valve assembly, the elongated pipe, the mismatch flange connection, and a base or sump support connection. There are side openings close to the second end of the elongated pipe or mismatch flange connection and to the inlet(s) of the impeller / pump for suction. A side valve flange may be mounted on the mismatch flange connection to make a closed volume around the pump / impeller. The side valve flange may be mounted on the elongated pipe and the sump support to make a closed volume around the pump / impeller. The top of the side or foot valve assembly seats on the mismatch flange connection or elongated pipe. The bottom of the side or foot valve assembly seats on the mismatch flange connection or sump support. The system is capable of moving a valve casing between a first position, in which the inlet of the pump / impeller is open, and a second position in which the inlet of the pump / impeller is closed. The side or foot valve assembly flange, elongated pipe, and either the mismatch flange connection or the sump support connection seals off the pump / impeller from other parts of the container. The side or foot valve assembly is configured to stand in a first position when open when the side or foot valve casing is at a distance from the seating places. The seating places are located on the elongated pipe, mismatch flange connection, and the base and / or the sump support connection. The system includes all impermeable members that bias the side or foot valve assembly casing towards its closed position. An opening / closing mechanism is provided for positioning the valve casing in its first or second positions to close and open the inlet of the impeller / pump which is located at the side of the pump / impeller close to the suction area of the impeller / pump. According to the disclosure, the exemplary shapes of the valve casing with an open-ended pipe, such as an open-ended cylindrical shape have the advantage that the valve casing is easier to move since this shape displaces less fluid when displaced along the longitudinal axis of the elongated pipe, thereby experiencing less drag and requiring less force to displace it as compared to valve casings with a flared or conical profile. It displaces less fluid as it does not "shovel" or "scoop" away as much fluid or liquid as when having a U- shape or a cup or pan shape, even though the cup or pan has a bottom hole.

[0067] Effects and features of the second aspect are to a large extent analogous to those described above in connection with the first aspect and / or any other aspect below. Embodiments mentioned in relation to the first aspect are largely compatible with embodiments of the second aspect and / or any other aspect below. For example, an area could be a portion or section or part of an entity and / or even different levels as seen in the longitudinal or vertical direction of the elongated pipes, such as sealing areas at different heights and / or levels vertically and / or in the direction of the elongated pipe.

[0068] Thus, the object described above, along with several other objects, is intended to be achieved in another aspect by providing a mechanism for encapsulating a pump and / or impeller in a fuel tank without disturbing the pump function.

[0069] Compared to the side or foot valve assemblies of the prior art where the opening and closing are controlled by the pressure difference between top and bottom sides of a plate or disc, the present invention allows the opening and closing to be controlled independently and easier with less effort / energy used for moving the valve case.

[0070] Brief description of the drawings

[0071] The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and nonlimiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings.

[0072] Figures 1A and IB each shows a side cross-sectional view of a container comprising a fuel pump system with a foot valve assembly in different states, fig. 1A shows a foot valve assembly in an open state and fig. IB shows a foot valve assembly in a closed state according to an embodiment of the present disclosure.

[0073] Figures 2A and 2B each shows a side cross-sectional view of a container comprising a fuel pump system with a foot valve assembly in different states, fig. 2A shows a foot valve assembly in an open state and fig. 2B shows a foot valve assembly in a closed state according to another embodiment of the present disclosure.

[0074] Figures 3A and 3B each shows a side view of the foot valve assembly as shown in figs. 1A and IB in the same different states, i.e., fig. 3A shows the foot valve assembly of fig. 1A in the open state and fig. 3B shows the foot valve assembly of fig. IB in the closed state.

[0075] Figures 4A and 4B each shows a side view of the foot valve assembly as shown in figs. 2A and 2B in the same different states, i.e., fig. 4A shows the foot valve assembly of fig. 2A in the open state and fig. 4B shows the foot valve assembly of fig. 2B in the closed state.

[0076] Figure 5 shows a side cross-sectional view of the foot valve assembly as shown in figs. 1A and 3A in the same open state but in greater magnification for more detail.

[0077] Figure 6 shows a side cross-sectional view of a container comprising a fuel pump system with a foot valve assembly in an open state according to yet another embodiment of the present disclosure.

[0078] Figures 7A and 7B each shows a cross-sectional view in perspective of a foot valve assembly in a closed state according to other embodiments of the present disclosure.

[0079] Figure 7C shows a side cross-sectional view of a foot valve assembly in a closed state according to one more embodiment of the present disclosure.

[0080] Figs. 8A - 8C show a system comprising an embodiment of a foot valve assembly for use within a container. When in use, the foot valve assembly is submerged within a fluid contained within the container.

[0081] Figs 9A and 9B shows an embodiment of the foot valve assembly. Fig 9A show the foot valve assembly 9A from the outside while fig. 9B show a cross section of the foot valve assembly of figs. 8A - 9B along the A-A plane indicated on fig. 9A. Fig. 9C shows a cross section similar to fig. 9B of an embodiment like the one shown in figs. 9A and 9B but with a slanted or declining bottom at the second end of the elongated pipe.

[0082] Detailed description

[0083] The present disclosure will now be described with reference to the accompanying drawings 1A to 9C, in which preferred example embodiments of the disclosure are shown.

[0084] Figures 1A to 2B and 6 show schematic depictions of cross-sectional views of a container 100 comprising one or more vertical pumps with components 4 and 5 to pump liquid fuel, an elongated pipe 3, and an inner elongated pipe 3', and one or more foot or side valve assemblies 1. The whole pump and valve system comprises the elongated pipe 3, at least one foot valve assembly 1, at least one mismatch flange connection, with at least one flange 2a and at least one base 2b or sump support 2d to make an encapsulated volume around an impeller lb in the container 100 when the foot valve assembly 1 is closed.

[0085] The mismatch flange connection is defined as a pair of flanges both comprising at least one sealing element, such as a gasket, an energized seal, and / or a seal wherein the gaskets, energized seals, and / or seals do not align when the two flanges abut each other. This creates at least two impermeable sealings and thereby provides redundancy in the sealing of the foot valve assembly 1 when closed.

[0086] The elongated pipe 3 is working as a support pipe inside the container 100 for the foot valve assembly 1 and comprises at least one or more first openings 3a at a first end 3b and at least one or more radial fenestrations 3c at a second end 3d and surrounds the inner elongated pipe 3' which acts as a cargo or fluid path or cargo tube or pipe for the liquid fuel.

[0087] The cargo fluid is pumped by the impeller lb and rises upwards between an impeller shaft 4 and the inner elongated pipe 3' when the impeller lb is rotating and the foot valve assembly is in an open state, as shown in figs. 1A, 2A, 3A, 4A, 5, and 6 (corresponding to figs. 8C, 9B and 9C of another embodiment). Figs. IB, 2B, 3B, 4B, and 7A to 7C show the foot valve assembly 1 in a closed state (corresponding to at least fig. 8A of the other embodiment). The inner elongated pipe 3' is in fluid communication with a housing 6 of the pump to be able to receive cargo fluid or liquid fuel when pumped and lead it out of the container 100 at the upper or top opening 3a when the impeller lb rotates and the foot valve assembly 1 is open.

[0088] The foot valve assembly 1 comprises a valve casing 2 which is actuated to be able to move between a first position and a second position. The foot valve assembly 1 is in the open state when the valve casing 2 is in its first position and in closed state when the valve casing 2 is in its second position.

[0089] The at least one or more radial fenestrations 3c at the second end 3d of the elongated pipe 3 forms one or more inlets into the impeller lb that receives flow when the foot assembly 1 is opened or in the open position as shown in figs. 1A, 2A, 3A, 4A, 5, 6 8C, 9B and 9C. The foot valve assembly 1 is arranged at the second end 3d of elongated pipe 3. The foot valve assembly 1 comprises valve housing 2 and at least one flange 2a fixed to a base 2b extending the elongated pipe 3. In an embodiment, the foot valve assembly 1 comprises the valve casing 2, the at least one flange 2a and a separate sump support 2d. The base 2b or sump support 2d is configured to be a support for the valve casing 2.

[0090] A first end 3a of the elongated pipe 3 is preferably sealingly attached to a top of the container 100. The foot valve assembly 1 is arranged at the second end 3d of the elongated pipe 3 and configured to close off flow and to open to let flow into a valve opening 2c and the radial fenestration 3c and out of a first pipe opening 3a arranged at the first end 3b of the elongated pipe 3 when pumping out of the inner elongated pipe 3'. When the pump requires maintenance, it should be disconnected from the inside of the container 100, such as by closing off flow with the foot valve assembly 1.

[0091] According to the disclosure, the foot valve assembly 1 comprises at least two valve sealing contact areas 7, 8, 9, 10, 11, 12 each with one or more sealing elements 19 or one or more pairwise arranged sealing elements 19.

[0092] According to the disclosure, at least two valve sealing areas 7, 8 of the foot valve assembly 1 comprises at least two valves sealing and seating contact sections or portions 9, 10, 11, 12 configured to sealingly engage when closing the foot valve assembly 1 and when closed by usage of sealing elements 19.

[0093] According to the disclosure, a top or upper seating or sealing area 7 on the foot valve assembly 1 seals at a sealing section 9 10 on a horizontal surface 9, 10 and / or on a vertical surface 9, 10 on at least one upper flange 2a of the foot valve assembly 1.

[0094] According to the disclosure, a lower seating or sealing area 8 on foot valve assembly 1 seals on a sealing section 11, 12 on a horizontal surface 11, 12 and / or on vertical surface 11, 12 on at least one base 2b and / or at least one sump support 2d interacting to provide the function and use of foot valve assembly 1 with a sealing system or mechanism 30 using movable parts and stationary parts to achieve the inventive valve functionality and sealing.

[0095] Figures 1A, 2A, 3A, 4A, 5, and 6 show the new system with the foot valve assembly 1 with the valve casing 2 in its first position, while figs. IB, 2B, 3B, 4B and 7A to 7C depict the foot valve assembly 1 with the valve casing 2 in its second position. In figs. 1A, IB, 3A, 3B, 5, 6 7A and 7B, the combination of the foot valve assembly 1, and the mismatch flange connection with flange 2a, base(s) 2b and / or sump support(s) 2d, and the elongated pipe 3 is shown.

[0096] Figures 1A to 2B, and 6 depict a new deep well pump system designed to encapsulate a vertical pump with an impeller lb components 4, 5 within a container 100, these components are also comprised in the system of figs. 8A to 8C but with other numerals. This container 100 is typically a fuel tank, which stores LNG, butane, ethane, or propane gas on a vessel, where the gas is used as fuel for the ship's engine or auxiliary equipment. The pump can be used in containers 100 for offshore industries and onshore industries.

[0097] The foot valve assembly 1 is made of an appropriate material resisting any negative effects from the stored substance and / or thermal load, i.e., incurred by low and / or high temperatures. Varying temperatures incur cyclic stresses on all parts affected by the varying temperatures or affected by constantly low or high temperatures in container 100. The foot valve assembly 1 is made from a fluid-impermeable material and has two sealing surfaces 7, 8, one at the upper level 7 and one at the lower level 8. According to the disclosure, the foot valve assembly 1 is connected to an actuator la to control closing and opening of the foot valve assembly 1 via the valve casing 2 as shown in figs. 1A to 7C. According to the disclosure, the sealing mechanism 30 comprises valve sealings and valve seats being displaceable by the actuator la relative to each other between the first position of the valve casing 2 in which the foot valve assembly 1 is closed to seal off flow - as shown in figs, IB, 2B, 3B, 4B, 7A, 7B and 7C - and the second position of the valve casing 2 where the valve seats and valve sealings are at a distance from each other - as shown in figs. 1A, 2A, 3A, 4A, 5 and 6.

[0098] According to the disclosure, these valve sealings and valve seats of the sealing mechanism 30 form the at least two different valve sealing areas 7, 8, 9, 10, 11, 12. According to the disclosure, at least one or more upper valve sealing areas 7, 9, 10 are arranged closer to the first end 3b than at least one or more lower valve sealing areas 8, 11, 12 as shown in figs. 1A to 7C of the disclosure. According to the disclosure, the movable valve casing 2 is an outer cover slidably or telescopically arranged around the second end 3d of the elongated pipe 3 as applicable in all embodiments of the disclosure.

[0099] According to the disclosure, this enables displacing the valve casing 2 by means of the actuator la along the longitudinal axis of the elongated pipe 3. The valve casing is displaced between its second position where the valve sealings and valve seats of the sealing mechanism 30 sealingly mate at both the first and second valve sealing areas 7, 8, 9, 10, 11, 12 and its first position where the valve sealings and valve seats of the sealing mechanism 30 are distanced from each other providing at least one or more orifices 2c at each of the first and second valve sealing areas 7, 8, 9, 10, 11, 12 to enable flow.

[0100] The foot valve assembly 1 and the valve casing 2 can have any suitable shape, e.g., a cross-sectional S-shape or a Z-shape as shown in figs. 1A, IB, 2A, 2B, 5, and 6.

[0101] The valve casing 2 can alternatively have a cross-sectional U -shape or cup-shape as shown in fig. 7B with a through hole in the bottom of the U or cup for the elongated pipe 3 and / or its second end 3d to move through when the valve casing 2 is moved along the elongated pipe 3. Alternatively, the valve casing 2 may be shaped like a cone stub with open ends as shown in fig. 7C with the larger opening of the cone stub facing downwards. Another exemplary shape of the valve casing 2, 120 is an open-ended cylindrical shape as shown in figs. 7A and 8A to 9C. According to the disclosure, the valve casing 2 has openings at each end enabling the valve casing 2 to circumferentially surround and move or slide along the elongated pipe 3 and / or its second end 3d without jamming and to provide as little obstruction as possible for any flow of substance stored in the tank 100 to pass through easily and smoothly and into the impeller lb when the valve casing 2 is in its first position.

[0102] According to the disclosure, the valve casing 2 may be a single piece movably supported around the second end 3d of the elongated pipe 3. The elongated pipe 3 comprises a lower flange 3f at its second end 3d. The lower flange 3f is in an embodiment configured to be detachably connected to an upper flange 2e of the mismatch flange connection 2a as shown in figs. 7A to 7C.

[0103] The lower flange 2f is in an embodiment configured to sealingly engage the valve casing 2 when it is in the second position and to disengage when it is in the first position as shown in figs. 2A and 2B. The at least one flange 2a forms a mismatch flange connection with the base 2b or the sump support 2d also being configured as flanges as shown in figs 1A-7B.

[0104] In fig. 7C the base 2b has an outer conical shape corresponding to the inner cone stub shape of the valve casing 2. When using a mismatch flange connection with the flange 2a as shown in figs. 7A and 7B there is always one base 2b formed as a lower flange adjacent to the bottom of the elongated pipe 3 when being a sump support 2d.

[0105] In figs. 7A and 7B, a mismatch flange connection with three vertically mismatched flanges 2a, 2b and 2e is shown. An upper flange 2e on the second end 3d is connected to the lower flange 3f of the elongated pipe 3 as shown in figs. 1A, IB and 5 (this upper flange 2e is also shown in figs. 7A to 7C).

[0106] In figs. 7A and 7B, there are two other flanges 2a and 2b - besides the upper flange 2e - for sealing and seating of the associated sealing surfaces of the valve casing 2 on the two flanges 2a and 2b that are part of the mismatch flange connection.

[0107] It should be noted that protrusion of the flanges, such as upper flange 2e and the lower flange 2f can be minimized to save material. In fig. 7a-7c the protrusion is exaggerated to demonstrate that the sealing surface must be smooth for optimal performance, and the roughness of protruding surfaces should be within an acceptable range — maintaining low values as recommended by the seal supplier.

[0108] When using a sump or sump connection as shown in figs. 2A, 2B, 4A, and 4B, the flange 3f at the second end 3d of the elongated pipe 3 is used for sealing against the upper parts of the valve casing 2 and another lower flange 2f that is part of the sump support 2d is used for sealing against the lower part of the movable valve casing 2.

[0109] The elongated pipe 3 is connected to the container 100 at the top of the container 100. The elongated pipe 3 can also be connected to walls of the container 100 by the use of mid-support(s) 23 and internal structures to the non-rotating parts 5 of the pump and the inner elongated pipe 3' to prevent any excess vibration.

[0110] Sealing elements 19 are arranged around the circumference of the flange 2a and around the circumference of the base 2b or the sump support 2d on the outer vertical edges and / or arranged circumferentially on the horizontal surfaces of the flange 2a and on the horizontal surfaces of the base 2b or the sump support 2d (see figs. 1A to 7B). Alternatively, they may be arranged circumferentially around on an inclined or conical outer surfaces as shown in fig. 7C.

[0111] Corresponding or complementary sealing elements 19 are arranged circumferentially on the inside of the valve casing 2 to sealingly mate with the associated sealing elements on the flange 2a and the base 2b or the sump support 2d as seen in figs. 1A to 7C.

[0112] Hence, the sealing elements 19 of the sealing mechanism 30 are possible to arrange on differently orientated inner and outer surfaces of the foot valve assembly 1, i.e., the movable valve casing 2, the flange 2a or the sump support, the second end 3d and lower flange 3f of the elongated pipe 3 and / or the second end 3d that can be removably attached to the lower flange 3f of the elongated pipe 3.

[0113] According to the disclosure, the second end 3d of the elongated pipe 3 comprises at least one inner fenestrated tubular wall 3e extending in a direction being inclined, such as a cone as shown in fig. 7C, relative the second end 3d or in parallel with the longitudinal axis of the elongated pipe 3 as shown in figs. 1A-7B of the disclosure. When using mismatch flange connection as shown in figs. 7A to 7C, at the lower flange 3f of the elongated pipe 3, the mismatch section is bolted at its top flange 2e, which can be inclined or vertical / horizontal. sump support 2d as shown in figs. 2A, 2B, 4A, and 4B, the sump support 2d is supported on the bottom of the container 100.

[0114] According to the disclosure, at least one of the radial fenestrations 3c on the second end 3d is / are through-going holes in the at least one inner fenestrated tubular edge or wall 3e to form impeller inlets. This inner fenestrated tubular edge or wall 3e is configured at the second end 3d of the elongated pipe 3. This inner fenestrated tubular edge or wall 3e forms the impeller inlet and connects the at least one flange 2a, base 2b, or sump support 2d. This inner fenestrated tubular edge or wall 3e is located at a radial distance inward from the outer edges or ends of the at least one flange 2a and the base 2b or the sump support 2d. This minimizes any disturbance of the pump's inlet flow, as the sealing system 30 is positioned far from the inlet, ensuring the pump's efficiency is not compromised. It is preferable that the size of the radial fenestrations 3c should be more than three or four times the pump / impeller suction area. This ratio depends on the size of the pump / impeller suction, but preferably this ratio is more than three or four times to ensure effectiveness. Much effort and numerical analysis have been required for the inventors to find this ratio for different pump / impeller sizes.

[0115] According to the disclosure, the at least one fenestrated tubular edge or wall 3e extends between and perpendicularly to the planes of extension of the at least one flange 2a and the base 2b or the sump support 2d. Close to the bottom of the elongated pipe 3 which is connected to the mismatch flange connection are enough radial fenestrations 3c to behave like flow channels to allow an appropriate inlet for the pump / impeller suction. When in its first position the valve casing 2 is arranged at a distance from the seating or sealing areas 9, 10, 11, and 12 on the flange 2a and base flange 2b or sump support plate 2d.

[0116] By displacing the valve casing 2 by means of the actuator la from its first position to its second position, the valve casing 2 is seated on sealing sections 9, 10, 11 and 12 on the flanges 2a and base 2b as shown in figs. 2B, 3B, and 7A to 7C. When the valve casing 2 is in its second position the foot valve assembly 1 encapsulates the impeller / pump lb and its components 4, 5 from the outside of the elongated pipe 3. When the valve casing 2 is in its first position, the valve casing 2 is arranged at a distance from the flange 2a and the base 2b or the sump support 2d as shown in figs. 1A, 2A, 3A, 4A, 5 and 6 to let a flow through the orifices 2c formed between the valve casing 2, the flange 2a and the base 2b or the sump support 2b and through the radial fenestrations 3c on the inner wall 3e and into the pump housing 6.

[0117] Thus, when the valve casing is in its first position as shown in figures 1A, 2A, 3A, 4A, 5 and 6, the fluid / cargo can flow from the interior of container 100, through the orifices 2c formed by the inlet gap between the valve casing 2, the base 2b or sump support 2d, the flange 2a and elongated pipe 3, and its bottom flange 3f through the radial fenestrations 3c on the vertical or conical side (see fig. 7C) on the side wall 3e of elongated pipe 3 and / or its distal end 3d or on the flange 2a or on the sump support 2d into the pump lb and through the inner elongated pipe 3' and out of the opening 3a at the first end 3b. The orifices 3c are located on the wall 3e as shown in figs. 7A to 7C if a mismatch flange connection is used. Alternatively, radial fenestrations 3c can be on the wall of the sump support 2d if the sump support is used as shown in figs. 2A, 2B, 4A and 4B.

[0118] As illustrated in figures IB, 2B, 3B, 4B, 7A, 7B and 7C, the valve casing 2 of the side valve 1, in closing situation, can sit on the upper sealing section 9 on the elongated pipe 3 or on the upper surface or sealing section 10 of the flange 2a or the sump support 2d. The lower sealing surface or area 8 of the side valve 1 can seal via the sealing section 12 on the base 2b or the sump support connection 2d to encapsulate the impeller lb with components 4, 5 from outside of the elongated pipe 3.

[0119] To encapsulate the impeller lb and components 4, 5 from the outside of the elongated pipe 3, the upper sealing area 7 on the valve casing 2 sits on the upper sealing areas of the flange 10 or on sealing area 9 of the elongated pipe 3. When the valve casing 2 is in its second position, the lower sealing area 8 of the foot valve assembly 1 seals either via lower sealing section 11 of the base 2b or the sealing sections 12 of the sump support connection 2d.

[0120] Both sealing sections 9 and 10 are located on the flange 2a and the valve casing 2 to sealingly interact when the foot valve assembly 1 is closed. Both sealing sections 11 and 12 are located on the base 2b or the sump support 2d and the valve casing 2 to sealingly interact when the foot valve assembly 1 is closed. As shown in figs. 1A, IB, 2A, 2B, 3A, 3B, 4A, 4B, 5, and 6, a pump comprises rotating parts 4 and non-rotating parts 5. The non-rotating parts 5 of the pump comprise the pump cylinder or housing 6 at the second end 3d and in the inner elongated pipe 3'. Alternatively, the elongated pipe 3 is placed over the pump housing 6. The rotating parts 4 of the pump have an impeller lb, inducer(s) positioned inside the pump housing 6. The impeller lb is approximately located near the radial fenestrations 3c.

[0121] The non-rotating parts 5 of the pump include an inlet bell, diffuser, suction branch, the inner elongated pipe 3', and discharge / outlet. When the shaft 4 of the impeller lb rotates, the impeller lb can draw fluid from the container's interior through side holes on either the flange 2a or from the radial fenestrations 3c of the intermediate wall 3e and / or orifices 2c close to the second end 3d of the elongated pipe 3. The cargo is lead to discharge through the inner elongated pipe 3', 130. This pumping function is the same in the embodiment shown in figs. 8A to 9C.

[0122] The seating or sealing areas 7, 8 on the foot valve assembly 1 are located at the top and the bottom of the foot valve assembly 1 and comprises one or more of the same type and / or different type of seals 19, such as lip seals 19, O-rings 19, reinforced-energized seals 19, and any other appropriate components or elements for a sealing 19.

[0123] In order to adjust the correct location of sealing areas 7, 8 of the sealing mechanism 30 of the foot valve assembly 1, on sealing or seating sections 9, 10 at or on the flange 2a any mechanical guiding 20, ring or adjustable / flexible tools 21 can be implemented. Alternatively, any appropriate mechanical guiding 20, ring or adjustable / flexible tools 21 can be implemented to adjust the correct location of sealing areas 7, 8 of the sealing mechanism 30, on sealing area 9 at the elongated pipe 3, and / or on sealing area 12 at or on the base 2b or support sump support 2d.

[0124] To adjust the exact distance between sealing areas 7-12 of the sealing mechanism 30, any flexible component 21 such as O-rings and / or springs can be used. Alternatively, a precise recess and notch on the surfaces of the sealing areas and / or sections 7-12 can be used. To adjust the distance between two surfaces, the dead height of the flexible component 21 is applicable and crucial. This way, the stopping points for the two mating surfaces of the sealing areas and / or sections 7 - 12 are controlled. The function of flexible components 21 is to use the dead height of them and not their stiffness. Alternatively, or in combination, a suitable sensor can be used to measure the downward displacement of the valve casing 2 to control the location and positioning of the valve casing 2 in active conditions to ensure proper sealing by feedback to a control unit controlling the actuator la and any associated drive component.

[0125] During operation of the pump with impeller lb and components 4, 5, the foot valve assembly 1 is in its open position, where the sealing areas and / or sections 7-12 are distanced far from each other. The sealing mechanism 30 may be normally open unless a force is applied to move the valve casing 2 of side valve 1 towards its second position. In figs. 1A to 6, an appropriate mechanism, i.e., the actuator la is activated and controlled by the control unit and any powering means to move the valve casing 2 from its first position shown in figs. 1A, 2A, 3A, 4A, 5, and 6 to its second position in figs. IB, 2B, 3B, 4B, 7A, 7B and 7C. In the second position, four sealing areas are in contact to encapsulate impeller lb and components 4, 5 from other parts of container 100 by using the elongated pipe 3 and its flange 3f, the flange 2a and the base 2b or the sump support 2d.

[0126] Mechanical seals or sealing elements 19 and tools 14 - 18 are used to position, guide and stop the valve casing 2 properly. An external force is applied to move down the valve casing 2 from its first position shown in figs. 1A, 2A, 3A, 4A, 5 and 6 to make a closed volume around the impeller lb and components 4, 5 in the second position shown in figs. IB, 2B, 3B, 4B, 7A, 7B and 7C.

[0127] Figs. 1A-6 illustrate variants of the closing and opening mechanism in the form of the actuator la for the foot valve assembly 1. The actuator la includes one or more pipes 16 configured to introduce inert gas into the foot valve assembly 1 by pressurizing means, such as one or more movable pistons 15 and one or more rods 14. The piston(s) 15 is / are activated by supplying inert gas through the pipe(s) 16 pushing the valve casing 2 downwards. The mechanism used by the actuator la can alternatively be an active nut-screw 22 device as shown in fig. 6. Other mechanisms of the actuator la can be activated by usage of one or more solenoid valves. Any chosen mechanism applied by the actuator la moves the valve casing 2 along the longitudinal axis of the elongated pipe 3 towards the seating and / or sealing sections 9 -12. Such actuating entities, i.e., at least their functionality, are equally applicable to use in the embodiment of figs. 8A to 9C as the valve casing 120 in that embodiment is moved in the same or similar way when operated. The mechanical mechanism of the actuator la should hold the weight of the movable parts of the foot valve assembly 1 by one or more rods 14 or wires 18. The holding and moving components of the actuator la which move the valve casing 2 of the side valve 1 from the open position downwards to the closed position are made of stainless steel. The one or more rods 14, pistons 15, pipes 16, winches 17, and / or wires 18 are part of pushing and pulling mechanisms usable by and / or part of the actuator la. Preferably, the needed components 13-18 to move the valve casing 2 of the side valve 1 up and down are equally and / or symmetrically distributed around the periphery and / or circumference of the elongated pipe 3. The pulling mechanism of the actuator la exerts a force on each rod 14 and / or wire 18, thereby moving the valve casing 2 of the foot valve assembly 1 vertically upwards to its first position. Such mechanical members or entities, i.e., at least their functionality is equally applicable to use in the embodiment of figs. 8A to 9C as the valve casing 120 in that embodiment is moved in the same or similar way when operated.

[0128] For adjusting the positioning of the valve casing 2 of the foot vale assembly 1 at or in or on its second position, one or more sealing elements 19, guiding components 20, and positioning / stopping components 21, are applicable to ensure that sealing is appropriately achieved on or at or in the sealing areas 7-12. Such sealing, guiding, positioning and stopping members or entities, i.e., at least their functionality is equally applicable to use in the embodiment of figs. 8A to 9C as the valve casing 120 in that embodiment needs the same or similar guiding and movement control.

[0129] By pressing or pushing down the valve casing 2 of the side valve 1 on and / or into the sealing areas and / or sections 7-12, the rotating parts 4 and non-rotating parts 5 of the pump are sealed off from the content of the container 100.

[0130] If the tank 100 is filled or partially filled by cargo, the load on each rod 14 and piston 15 may be released and the valve casing 2 is securely located and sealing the pump with components. If the container 100 is filled, the fluid pressure from inside the container 100 exerts a force on the valve casing 2 of the side valve 1, maintaining it in the second position. If there is no pressure inside the tank 100, then external pressure, load or forces are needed to keep the valve casing 2 in sealing engagement and contact with the sealing areas 7-12 of the sealing mechanism 30 to tightly encapsulate and seal off the pump and its components 4, 5 from the cargo inside the container 100. To relocate the valve casing 2 from its second position to its first position, the external load may be needed to pull up each rod 14 and / or wire 18. Each winch 17 can also be used to pull up the valve casing 2. When the valve casing 2 is pulled up, the valve casing 2 is relocated in a parking position through each rod 14 and / or wire 18.

[0131] One or more guiding components 20 and any stopping components 21 are used to conduct and align at least four or more sealing areas 7-12 to seat / abut on each other correctly and seal off the inside of the elongated pipe 3. The role of one or more stopping components 21 are to stop the valve casing 2 in its movement at or in a correct position relative the sealing areas 7-12. The stopping components or tools 21 can be any mechanical tools whose dead length and / or height after deformation is appropriate. The flexible positioning and stopping component 21 can be an O-ring, rubber or a spring. Instead of any flexible component 21, it is possible to use a bump / recess with a correct height to provide a correct and reliable aligning and mating for one or more sealing elements 19. Such sealing, guiding, positioning, stopping and flexible members or entities, i.e., at least their functionality is equally applicable to use in the embodiment of figs. 8A to 9C as the valve casing 120 in that embodiment needs the same or similar guiding, sealing and movement control.

[0132] Figures 3A, 3B, 4A and 4B illustrate different closing mechanisms or actuators la for moving the valve casing 2 of the side valve 1 downward to perform sealing in contact with sealing areas 7-12. It is shown that one or more pistons 15 can be used. Alternatively, the actuator la can use one or more rods 14 and move down each rod 14 together with the valve casing 2 by any mechanism. For a piston 15 hydraulic or pneumatic actuators la can be used to force down the valve casing 2. All needed components can be made from stainless steel. In some embodiments, each rod 14 is connected to a hydraulic / pneumatic reciprocating piston 15, or the rod can be connected directly to the outside of container 100 and move the valve casing 2 downward by any other mechanical mechanism. In case of using a piston 15, the fluid / gas is supplied to the pipe 16, by any external actuator outside the container 100. By applying the needed flow of gas into a piston 15 the piston moves downward and moved the valve casing 2 to its second position. If a piston 15 is used, it can then be implemented to move the valve casing 2 upward and put the valve casing 2 in the parking position. To seal correctly between sealing areas 7-12, the closing force of the valve casing 2 should be distributed correctly over the contact surfaces, wherefore a sufficient number of rods 14 are needed to distribute vertical loads and contact pressure uniformly. To move the valve casing 2, any mechanism such as a one-way piston 15, a reciprocating piston 15 or a rod 14 and winch 17 can be used.

[0133] If the container 100 is filled with cargo and the valve casing 2 is located is int its second position, the force required to pull up the valve casing 2 may be provided by a winch 17 or similar mechanism. The wires 18 / rods 14 connected to the valve casing 2 need to apply sufficient load to move the valve casing 2 from its second to its first position and then secure the valve casing 2 of the side valve 1 in the parking position.

[0134] One or more pairs of sealing elements 19 are placed at sealing areas 7-12 to create the seal. The sealing elements 19 seal off the impeller lb with components 4, 5 from outside of the foot valve assembly 1 i.e., seal off from the cargo inside container 100.

[0135] The outer surface of the valve casing 2, is big enough to use one or more eyebolts 13 or any other appropriate connection for pulling up and pressing down the valve casing 2. It is important to have an appropriate guide mechanism 20 for the valve casing 2 to ensure that the valve casing 2 moves correctly. The valve casing 2 should abut in a correct position with respect to the sealing areas 7-12 and sealing elements 19. In case of using a wire / chain 18 for moving the valve casing 2 to its first position, the eyebolts 13 or any other lifting tools can be used. To move the valve casing 2 to its second position, a rod 14 can be bolted to the valve casing 2. Any vertical load should transfer correctly from the rod 14 to the valve casing 2. The rods 14 or any other component connected to the side valve 1 should be guided correctly, e.g., by passing through bore holes 20 which is connected to the elongated pipe 3, or by any guide 20 on the flange 2a or the base 2b or the sump support 2d. When closing the foot valve assembly 1, the rod 14 is pushed down and the valve casing 2 of is seating on sealing areas 7-12.

[0136] In some embodiments, one or more of the sealing elements 19 are added on all sealing areas 7-12. The height of the valve casing 2, is proportional to the distance between sealing areas 7, 9, 10 on the mismatch flange connection. In another embodiment the height of the valve casing 2 is proportional to the distance between sealing areas 8, 11, 12 on the elongated pipe 3 and the base 2b or the sump support 2d. In some embodiments, the height of the valve casing 2, is proportional to the distance between sealing areas 7, 9, 10 on the mismatch flange connection and the sealing areas 8, 11, 12 on the elongated pipe 3 and the base 2b or the sump support 2d as most clearly seen in figs. 7A to 7C. In case of using the sump support 2d, the inner sealing surface is connected to the elongated pipe 3 and the outer sealing surface is connected to the sump support connection 2d. The valve casing 2 can be made by casting in one piece or welding together one or more flanges and a cylinder.

[0137] The pulling up mechanism of the actuator la can be configured by a winch 17 and a nutscrew 22, as in fig. 6, or one or more hydraulic / pneumatic pistons 15. The nut-screw mechanism 22 may comprise an appropriate nut cooperating with a thread. The function of the nut-screw mechanism is to convert rotational motion into translational motion. This is achieved through the interaction between the threads of the nut and the screw. When the screw is rotated, the threads cause the nut to move linearly along the screw's axis or vice versa. This type of mechanism is commonly used in various applications, such as mechanical lifting in jacks and lifting mechanisms, rotating the screw lifts or lowers a load attached to the nut. The nut-screw makes a precision movement. The nut-screw setup allows for controlled, accurate linear positioning. Overall, the nut-screw mechanism is valued for its ability to provide precise and controlled linear motion. Such a nut-screw mechanism can be used for all embodiments.

[0138] Figure 6 shows a nut-screw 22 embodiment. The rods 14 can be connected to each other by various mechanical systems, such as a nut while the ends of the rods are threaded. One end of the rod can have a threaded hole, while the other rod has an external thread. Other connection methods include rod connectors, fasteners for two metal rods, cage system construction, or any other method to join the rods.

[0139] To connect the inside of the container 100 to the outside, a sealing construction 24 is needed, see fig. 6. The sealing construction 24 is a combination of an O-ring, gasket, sealing elements 19, a spring / flexible component 21, or any other tools necessary to create a seal. This sealing system connects the inside of the container 100 to the outside of the container 100. The nut 22 is connected to the sealing construction to position the side valve 1 and all its components incl. the valve casing 2 properly. Alternatively, the pulling mechanism comprises a hydraulicly / pneumatic operated piston 15, or any other actuator such as a solenoid. The pulling mechanism is arranged in position above and outside container 100. Based on the length and needed force for pulling up the valve casing 2 the rod 14 diameter can be changed. The appropriate diameter should be used to avoid any failure.

[0140] In some respects, the base 2b or the sump support 2d comprises the lower sealing surface 11, 12, one or more sealing elements 19, one or more guiding components 20, one or more stopping and / or positioning components 21 and several channels and / or holes for flow. Additionally, the base 2b or the sump support 2d may - besides having enough inlet channels and appropriate sealing and conducting surfaces - be strong or sturdy enough. One or more side supports 23 may be installed inside the base 2b and / or sump support 2d to avoid any excess or undesired vibration which could negatively affect the pump. The main purposes of the sump support 2d is to prepare a suitable sealing surface for the lower part of the movable casing 2. This means that there is no need to have any radial fenestrations 3c, just having a good sealing surface is good enough as the sealing surfaces when opening form a sufficient flow path without additional need of radial fenestrations 3c to improve flow.

[0141] In some embodiments, the elongated pipe 3 may have an appropriate wall thickness and sturdy contact sealing surfaces which can be used for mid-supports and maintain a proper sealing function when subjected to high loads and / or excessive vibrations.

[0142] According to some embodiments, the flange 2a, base 2b, sump support 2d, the elongated pipe 3, the second end 3d, and / or the side wall 3e with openings 3c interconnecting the flange 2a and the base 2b or the sump support 2d is / are configured such that the radial fenestrations 3c and / or orifices 2c form an appropriate inlet channel for pump suction dimensioned based on the size of the pump inlet with a size of the inlet channel being more or less 3 or 4 times larger than the pump suction area through the inlet bell of the pump / pump housing 6. However, this size is related to pump size and capacity. Moreover, the sump support 2d can also be just a proper flat sealing surface without any orifice and / or openings and / or any upstanding edges / walls. The valve orifice(s) 2c is / are closed and opened by moving the valve casing 2 along the elongated pipe 3 and or the second end 3' of the elongated pipe 3. The second end 3d of the elongated pipe 3 may be arranged close to the bottom of the container 100 and the valve casing 2 may be controlled and guided by both the flange 2a and the base 2b or the sump / bottom support 2d when moved up and down. This guiding may improve sealing quality. The sump support 2d may be fixed at the bottom of the container 100. This means that any sealing surface on the support of the sump 2d is fixed to the bottom of the container 100 and stabilised improving sealing quality.

[0143] When using a mismatch flange connection, the flange 2a is connected to the elongated pipe 3 or the second end 3d as shown in figs. 7A to 7C. There are at least two sealing surfaces 9, 10 on the flange 2a. In these embodiments, the sealing surfaces 9, 10 and area 7 are not fixed as when using the sump support 2d but the sealing quality is still improved as this upper sealing area 7 on the flange 2a interacts with the lower sealing area 8 of the base 2b as a double-acting sealing.

[0144] The sump support 2d is not fixedly connected to the elongated pipe 3 but is fixed to the bottom of the container 100. The sump support 2d is a plate / structure that surrounds the impeller lb and provides stable sealing surfaces for the sealing components 8, 11, 12 and sealing elements circumferentially around the impeller lb. The sump support 2d can be bolted or welded and attached to any other structure inside the container 100. The centre of the sump support 2d is located in or aligned with the centre of the elongated pipe 3. The sump support 2d and the impeller lb are usually coaxial.

[0145] The sealing elements 19 are in some embodiments configured as circumferentially extending solid members to ensure sealing around each entity and between mating entities 2, 2a, 2b, 2d, 3, 3d, 3f to eliminate any leakage between each of the associated circumferential sealing and contact surfaces of the foot valve assembly 1 when closed.

[0146] Figs. 8A-8C show a system comprising an embodiment of a foot valve assembly 110 for use within a container 100. When in use, the foot valve assembly 110 is submerged within a fluid contained within the container 100. Features of the foot valve assembly 110 are best seen from figs. 9A-9C. Fig. 9A shows the foot valve assembly 9A from the outside while fig. 9B shows a cross section of the foot valve assembly 110 of figs. 8A - 9B along the A-A plane indicated on fig. 9A. in the cross sections shown on figs. 9b and 9c the cross section cuts through the radial fenestrations 140 on the left of the figures and through divisions between apertures of the radial fenestration 140 on the right side of the figures. Figs. 8A to 9C do not show the tubular shape of the parts of the inventive system, e.g., the valve assembly 110 is not shown in perspective as done in Figs. 7A and 7B for the valve assembly 1, but the overall design with a tubular and / or rounded shape of the components of the system is / are the same in both embodiments.

[0147] The foot valve assembly 110 comprises an elongated pipe 130 and a valve casing 120. The elongated pipe 130 comprises a first end 133 and a second end 135. The first end 133 comprises a first opening. The second end 135 comprises a radial fenestration 140, defining an inlet for a fluid. The elongated pipe 130 further comprises an impeller 150 housed within an inner elongated pipe 180. The impeller 150 is connected via an impeller shaft 200 to a motor (not shown) in a motor housing 250. The valve casing 120 is displaceable along the longitudinal axis 290 of the elongated pipe 130 between a first and a second position. In some embodiments, the first tube end 133 may be detachably connected to the elongated pipe 130 or be an integral or integrated part or section of the elongated pipe 130. The second tube end 135 may be detachably connected to the elongated pipe 130 or be an integral or integrated part or section of the elongated pipe 130. In some embodiments, the first tube end 133 and / or the second tube end 135 may be detachably connected to the elongated pipe 130 or the first tube end 133 and / or the second tube end 135 may be an integral or integrated part or section of the elongated pipe 130. In some embodiments, the second tube end 135 forms a free end of the elongated pipe 130.

[0148] The foot valve assembly 110 further comprises a strainer 160. The valve casing 120 is arranged between the elongated pipe 130 and the strainer 160 when viewed along the longitudinal axis of the elongated pipe 130. The strainer 160 prevents debris, impurities and / or solids from entering the radial fenestrations 140 and the impeller inlet 260. The strainer 160 is bolted to the second end 135 of the elongated pipe 130 via one or more strainer bolts 270, preferably only one bolt but if needed more can be used.

[0149] The valve casing 120 comprises a slot 240 for an actuation rod 280. The slot 240 comprises an aperture 220 for insertion of a pin or bolt to secure the actuator rod in the slot 240. The actuation rod 280 extends to an actuator, such as an electromotor which actuates the valve casing 120 via the actuation rod 280. The actuation rod 280 may by way of example be threaded and inserted into a threaded aperture so that the actuation rod 280 is translationally displaced upon rotation of the actuation rod 280 and / or the threaded aperture.

[0150] Fluid pumped in through the strainer 160, radial fenestration(s) 140, and impeller inlet(s) 260 by the impeller 150 is subsequently pumped via the inner elongated pipe 180 and exits the inner elongated pipe 180 via a pump outlet 170.

[0151] The foot valve assembly 110 comprises a top flange 210 for abutment to pipe segments of the elongated pipe 130. The top flange 210 is fastened via nut and bolt connections via the flange aperture 230 on in the top flange 210.

[0152] Fig. 8A shows the valve casing 120 in the first position, fig. 8B shows the valve casing 120 in an intermediate position between the first and second position, and fig. 8C shows the valve casing 120 in its first position. The valve casing comprises a first sealing surface 123 and a second sealing surface 125. The first sealing surface 123 and the second sealing surface 125 impermeably contact at least a portion of a surface of the elongated pipe 130 in at least the second position of the valve casing 120. When the valve casing 120 is in the second position, the first sealing surface 123 and the second sealing surface 125 are located across the radial fenestration(s) 140, whereby they prevent fluid communication between an interior of the elongated pipe 130 and an exterior of the elongated pipe 130.

[0153] The elongated pipe 130 comprises a bottom 190 at the second end 135. The bottom may have slanted surface which declines from its centre and radially towards the radial fenestration(s) 140 as shown on fig. 9C which also shows the actuation rods 280. As shown in fig. 9C a surface of the bottom 190 facing away from the interior of the elongated pipe 130 may define a cavity in order to save material while maintain a sufficient stiffness of the bottom 190.

[0154] In all embodiments, the impeller 150 / 2b may be substituted by a propeller, a displacement pump piston, or similar devices for creating a pressure difference to pump the fluid through the elongated pipe 130.

[0155] The components sharing the same name but not the same numerals across the embodiments shown in figs. 1A-7C and figs. 8A-9C functionally correspond to each other. By way of example, the foot valve assembly 110 of the embodiments shown in figs. 8A - 9C corresponds functionally to the foot valve 1 shown in figs. 1A - 7C; the valve casing 120 of the embodiments shown in figs. 8A - 9C corresponds functionally to the valve casing 2 shown in figs. 1A - 7C, and the elongated pipe 130 of the embodiments shown in figs. 8A - 9C corresponds functionally to elongated pipe 3 shown in figs. 1A - 7C. The same goes for the fenestrations 3c and the fenestrated wall 3e corresponding to the fenestrations 140.

[0156] The valve assembly 110 having the valve casing 120 being an open-ended tubular cylinder displaces less fluid as it does not "shovel" or "scoop" away as much fluid or liquid as when having a U-shape or a cup or pan shape as for the valve assembly 1, even though the cup or pan shape has a bottom with a through hole working as a fenestrated piston having a greater area or surface "pushing" more water ahead of itself as it is "scooping" more water with its conical shape as shown in Figs. 7B and 7C, while the casing 120 has a much smaller projected or front area or surface that "pushes" much less water as a wall ahead of itself, i.e., the casing 120 of figs. 8A to 9C moves similar to a tubular thin blade that "cuts" through the water with a "sharper" and less "blunt" front than the casing 2 in figs. 1 to 7C. In some embodiments, foot valve assembly 1, 110 is a modular unit that can be retrofitted - as it is detachable - onto or as inlets to existing pump solutions.

[0157] ITEMS

[0158] 1. A foot valve assembly 1 for use with an elongated tube 3 for encapsulating a removably arranged pump lb with components 4, 5 within a container 100, such as a fuel tank, the elongated tube 3 comprising at least a first opening 3a at a proximal end 3b and at least a second opening 3c at a distal end 3d, the foot valve assembly 1 being arranged at distal tube end 3d and configured to close off flow and to open to let flow into the pump lb, the foot valve assembly 1 comprising an actuator la to control closing and opening of the foot valve assembly 1, a valve casing 2, a mismatch flange 2a, a base 2b, 2d, and a sealing mechanism 30 comprising valve sealings and valve seats being displaceable by actuator la relative each other between a sealing position in which foot valve assembly 1 is closed to seal off flow and a non-sealing position at a distance from each other in which the foot valve assembly is open to enable flow into pump lb, characterized in that the valve sealings and valve seats of the sealing mechanism 30 form at least two different valve sealing areas and / or sections 7, 8, 9, 10, 11, 12 of which at least a first valve sealing area and / or section 7, 9, 10 is configured to seal at the mismatch flange 2a and arranged closer to proximal tube end 3b than at least a second valve sealing area and / or section 8, 11, 12 configured to seal at the base 2b, 2d, and that the valve casing 2 is configured as an outer cover movably arranged at the distal tube end 3d to be displace-able by the actuator la between the sealing position of foot valve assembly 1 with the valve sealings and valve seats of sealing mechanism 30 sealingly mating at / in both the first and second valve sealing areas and / or sections 7, 8, 9, 10, 11, 12 and the non-sealing position of the foot valve assembly with the valve sealings and valve seats of sealing mechanism 30 distanced from each other providing at least one orifice 2c at / adjacent / in each of the first and second valve sealing areas and / or sections enabling flow.

[0159] 2. The foot valve assembly 1 according to item 1, wherein the valve casing 2 comprises at least a first pair of first valve sealings at and / or in and / or on the first valve sealing area and / or section 7, 9, 10 and at least a second pair of second valve sealings at and / or in and / or on the second valve sealing area and / or section 8, 11, 12.

[0160] 3. The foot valve assembly 1 according to any preceding item, wherein sealing mechanism 30 comprises at least one pair of valve sealings and at least one pair of valve seats at / or in the first valve sealing area and / or section 7, 9, 10, which pair(s) of valve sealings and seats of this first valve sealing area and / or section are configured to sealingly mate.

[0161] 4. The foot valve assembly 1 according to any preceding item, wherein the base 2b, 2d is configured as a stationary support for the elongated tube 3 inside the container 100.

[0162] 5. The foot valve assembly 1 according to item 1 or 3 or 4 and item 2, wherein the base 2b, 2d comprises at least the second valve sealing area and / or section 8, 11, 12 and is configured to be at least partly enclosed or covered by the movable valve casing 2 to thereby sealingly mate with the movable valve casing 2 when the foot valve assembly 1 is in the closed position.

[0163] 6. The foot valve assembly 1 according to any preceding item, wherein the distal end 3d of the elongated tube 3 comprises at least one flange 2a extending radially outwards around the circumference of the distal tube end and is configured to be at least partly enclosed by and to sealingly mate with the movable valve casing 2 when the foot assembly 1 is in the closed position. 7. The foot valve assembly 1 according to item 6, wherein the at least one flange 2a of the distal tube end 3d is arranged closer to the proximal end 3b of the elongated tube 3 than the base 2b, 2d of the foot valve assembly 1.

[0164] 8. The foot valve assembly 1 according to item 6 or 7, wherein the at least one flange 2a of the distal tube end 3d is configured as a part of the first valve sealing area and / or section 7, 9, 10.

[0165] 9. The foot valve assembly 1 according to any preceding item, wherein the sealing mechanism 30 comprises at least one pair of valve sealings and at least one pair of valve seats at / or in the second valve sealing area and / or section 8, 11, 12, which pair(s) of valve sealings and valve seats of this second valve sealing area and / or section are configured to sealingly mate.

[0166] 10. The foot valve assembly 1 according to any preceding item, wherein the distal end 3d of the elongated tube 3 comprises at least one fenestrated tubular edge or wall 3e extending in a direction being inclined relative the distal tube end 3d or in parallel with the distal tube end.

[0167] 11. The foot valve assembly 1 according to item 10, wherein at least one or two or more or all of the second openings 3c at / on the distal tube end 3d is / are through holes in the at least one fenestrated tubular edge or wall 3e.

[0168] 12. The foot valve assembly 1 according to item 10 or 11, wherein the at least one fenestrated tubular edge or wall 3e is configured as an extension of the distal tube end 3d and / or the elongated tube 3.

[0169] 13. The foot valve assembly 1 according to any one of items 6 to 8 and any one of items 10 to 12, wherein the at least one fenestrated tubular edge or wall (3e) forms a tube inlet vertically interspaced between and connecting the at least one flange 2a and the base 2b.

[0170] 14. The foot valve assembly 1 according to item 13, wherein the at least one fenestrated tubular edge or wall 3e extends between and perpendicularly to the planes of extension of the at least one flange 2a and the base 2b. 15. The foot valve assembly 1 according to any one of items 6 to 8 and any one of items 10 to 14, wherein the at least one flange 2a is configured as an upper radially extending flat enclosure of the at least one fenestrated tubular edge or wall 3e and the base 2b is configured as a lower radially extending flat enclosure of the at least one fenestrated tubular edge or wall 3e.

[0171] 16. The foot valve assembly 1 according to item 6 and any one of items 10 to 15, wherein the distal tube end 3d comprises a lying down spool or cable drum or reel shape with the at least one fenestrated tubular edge or wall 3e being the central, cylindrical core and the at least one flange 2a and the base 2b being the large, flat circular ends or flanges having the base as a lower or bottom side.

[0172] 17. The foot valve assembly 1 according to any preceding item, wherein the movable valve casing 2 is configured as a cylindrical open-ended tube with one end facing upwards forming part of the at least first valve sealing area and / or section 7, 9, 10 with a centre hole configured to slidably surround the distal tube end 3d and / or elongated tube 3 and the other end facing downwards forming part of the at least second valve sealing area and / or section 8, 11, 12, or the movable valve casing 2 is configured with a shape similar to a cup turned upside down with the cup opening rim facing downwards and the cup bottom having a centre hole configured to slidably surround the distal tube end 3d and / or elongated tube 3, which cup bottom forms part of the at least first valve sealing area and / or section 7, 9, 10 and the cup opening rim forms part of the at least second valve sealing area and / or section 8, 11, 12, or the movable valve casing 2 is configured with a shape similar to a hat turned right side up with the opening facing downwards and the radially extending hat brim forming part of the at least second valve sealing area and / or section 8, 11, 12 and the tip of the crown of the hat forms part of the at least first valve sealing area and / or section 7, 9, 10 and has a centre hole configured to slidably surround the distal tube end 3d and / or elongated tube 3.

[0173] 18. The foot valve assembly 1 according to any one of items 1 to 16, wherein the movable valve casing 2 is configured as a conical open-ended tube with the larger opening facing downwards and the smaller opening facing upwards and configured to slidably surround the distal tube end 3d and / or elongated tube 3, and the distal tube end 3d and / or elongated tube 3 is / are configured with a conical outer shape fitting to the conical inner shape of the movable valve casing 2, wherein the at least first valve sealing area and / or section 7, 9, 10 is configured to seal off flow at the smaller upper opening of the valve casing and the at least second valve sealing area and / or section 8, 11, 12 is configured to seal off flow at the larger lower opening of the valve casing when the foot valve assembly 1 is in the closed position.

[0174] 19. The foot valve assembly 1 according to any preceding item, wherein the sealing areas and / or sections 7, 8, 9, 10, 11, 12 of the sealing mechanism 30 comprise at least two valve sealing contact areas or side valve seating areas 7, 8 being arranged on the movable valve casing 2 and on the at least one flange 2a forming the mismatch flange and on the base 2b or on the base in form of a sump support 2d and / or on the elongated tube / module 3, 3d and being displaceable by the actuator la between a closing position in which the sealing sections 9, 10, 11, 12 of the side valve sealing areas 7, 8 sealingly mate to close the tube opening(s) 3c forming side inlet channels of pump lb with components 4, 5 when the foot valve assembly 1 is in the closed position, and an opening position in which the sealing sections 9, 10, 11, 12 of the side valve sealing areas 7, 8 are distanced from each other when the movable valve casing 2 is or has been moved out of sealing engagement with the mismatch flange 2a and the base 2b or the sump support 2d and / or the elongated tube / module 3, 3d, the sealing areas and / or sections 7, 8, 9, 10, 11, 12 comprising one or more sealing elements 19 and / or stopping and positioning components 20 being arranged at or in or on the movable valve casing 2 and / or the mismatch flange 2a and / or the base 2b or the sump support 2d and / or the distal tube end / module 3d and / or the elongated pipe 3.

[0175] 20. The foot valve assembly 1 according to any preceding item, wherein the actuator la comprises a closing mechanism 13-18 comprising a rod 14, a wire and / or chain 18, and a pulling mechanism for providing a pull in the wire and / or chain, while optionally a nutscrew 22 through the rod 14 positions the valve casing 2 and is configured to pull up the valve casing 2 from the closing position to the opening position to put the valve casing 2 at a parking or non-operative position.

[0176] 21. The foot valve assembly 1 according to item 20, wherein the pulling mechanism comprises one or more eyebolts 13, one or more rods 14, one or more hydraulic and / or pneumatic pistons 15, such as a reciprocative piston 15, one or more optional pipes 16 for supply of inert gas into the foot valve assembly 1, one or more optional winches 17 and one or more wires and / or chains 18 to pull up or let or press down the valve casing 2. 22. The foot valve assembly 1 according to item 21, wherein the hydraulic and / or pneumatic piston 15 and / or the rod 14 and / or, optionally, the pipe 16 and / or, optionally, the nut-screw 22 is / are arranged on the distal tube end 3d and / or the elongated tube 3 and / or on the valve casing 2, preferably close to the opening position of the foot valve assembly 1 and / or the side opening(s) / hole(s) / channel(s) 3c, and / or arranged at a lower part of the base 2b or the sump support 2d and / or the mismatch flange 2a and / or the distal tube end 3d.

[0177] 23. The foot valve assembly 1 according to any preceding item, wherein the sealing mechanism 30 comprises at least one pair of sealing elements 19 forming at least one pair of valve sealings and valve seats at / or in each of the first 7, 9, 10 and the second valve sealing area and / or section 8, 11, 12, which pairs of sealing elements 19 are configured to be arranged at or on or in one or more horizontally extending surfaces of the movable valve casing 2 and the mismatch flange 2a and the base 2b, 2d and / or are configured to be arranged at or on or in one or more vertically extending surfaces of the movable valve casing 2 and the mismatch flange 2a and the base 2b, 2d and / or are configured to be arranged at or on or in one or more inclined surfaces of the movable valve casing 2 and the mismatch flange 2a and the base 2b, 2d extending at an inclination or angle between horizontal and vertical orientation.

[0178] 24. A container 100 for storing any type of liquid fuel, the container comprising a foot valve assembly 1 and an elongated tube 3 according to any of the preceding items.

[0179] LIST OF REFERENCE NUMERALS USED for figs. 1A - 7C

[0180] 1: Foot valve assembly. la: actuator. lb: Impeller.

[0181] 2: valve casing.

[0182] 2a: flange.

[0183] 2b: base.

[0184] 2c: orifice(s).

[0185] 2d: Sump support.

[0186] 2e: Upper flange of valve assembly for connection to second pipe end 3d.

[0187] 3: Elongated pipe.

[0188] 3': Inner elongated pipe.

[0189] 3a: First pipe opening(s).

[0190] 3b: First / Proximal end.

[0191] 3c: radial fenestration.

[0192] 3d: Second / Distal end.

[0193] 3e: fenestrated wall.

[0194] 3f: lower flange of pipe 3.

[0195] 4: Rotating parts of pump.

[0196] 5: Non-rotating parts of pump.

[0197] 6: Pump housing or cylinder.

[0198] 7: Upper sealing area.

[0199] 8: Lower sealing area

[0200] 9: Sealing section of upper sealing area 7

[0201] 10: Sealing section of upper top sealing area 7

[0202] 11: Sealing section of lower sealing area 8

[0203] 12: Sealing section of lower sealing area 8.

[0204] 13: Eyebolt.

[0205] 14: Rod.

[0206] 15: Piston.

[0207] 16: Pipe to supply inert gas

[0208] 17: Winch.

[0209] 18: Wire / Chain.

[0210] 19: Sealing elements.

[0211] 20: Guiding components.

[0212] 21: Stopping or positioning component for flexible components vertically.

[0213] 22: Nut-screw.

[0214] 23: Mid-supports

[0215] 24: Sealing structure connecting tank inside to tank outside.

[0216] 25: Rod connector / Nut-threaded mechanism / fastener for two rods.

[0217] 30: Sealing mechanism

[0218] 100: Container

[0219] LIST OF REFERENCE NUMERALS USED for figs. 8A - 9C

[0220] 100: container

[0221] 110: foot valve assembly

[0222] 120: valve casing

[0223] 123: first sealing surface

[0224] 125: second sealing surface

[0225] 130: elongated pipe 133 first end of elongated pipe

[0226] 135 second end of elongated pipe

[0227] 140 radial fenestration

[0228] 145 chamfered edge

[0229] 150 impeller

[0230] 160 strainer

[0231] 170 pump outlet

[0232] 180 inner elongated pipe

[0233] 190 bottom of elongated pipe

[0234] 200 impeller shaft

[0235] 210 top flange of foot valve assembly

[0236] 220 aperture

[0237] 230 flange aperture

[0238] 240 slot for actuator rod

[0239] 250 motor housing

[0240] 260 impeller inlet

[0241] 270 strainer bolt

[0242] 280 actuation rod

[0243] 290 longitudinal axis of elongated pipe

Claims

AMENDED CLAIMS received by the International Bureau on 26 March 2026CLAIMS1. A foot valve assembly (110) for use within a container (100), such as a fuel tank, comprising- an elongated pipe (130) comprising a first opening at a first end (133) and a radial fenestration (140) defining a fluid inlet arranged at a second end (135), with the elongated pipe (130) enclosing an impeller (150) arranged at the second end (135),- a valve casing (120) comprising a first sealing surface (123) and a second sealing surface (125) for impermeably contacting the elongated pipe (110), and with the valve casing (120) being configured to be displaceable along the longitudinal axis (290) of the elongated pipe (130) between a first position, where both the first sealing surface (123) and second sealing surface (125) is arranged on the same side of the radial fenestration (140) along the longitudinal axis (290) of the elongated pipe (130), and a second position where the first sealing surface (123) and the second sealing surface (125) are arranged across from the radial fenestration (140) along the longitudinal axis (290) of the elongated pipe (130), and wherein the first sealing surface (123) and second sealing surface (125) are configured to exert a sealing force against at least a portion of the surface of the elongated pipe (130) normal to the longitudinal axis (290) of the elongated pipe (130) to impermeably cover at least the radial fenestrations (140) when the valve casing (120) is in the second position.

2. The foot valve assembly (110) according to any preceding claim, wherein the first sealing surface (123) is configured to impermeably contact at least a portion of the surface of the elongated pipe (130) in the first and the second position of the valve casing (120).

3. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) is actively actuated, such as by an electromotor, such as by a pneumatic actuator, and / or a hydraulic actuator.

4. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) is actuated by an at least partially threaded actuation rod (280) extending through a threaded nut, so that the actuation rod (280) moves translationally when the nut and / or actuation rod (280) is rotated.

5. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) encloses the second end (135) of the elongated pipe (130).

6. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) comprises at least one spring energized seal for biasing the first sealing surface (123 )and / or second sealing surface (125) to exert a / the sealing force against at least a portion of the surface of the elongated pipe (130) normal to the longitudinal axis (290) of the elongated pipe (130) at least when the valve casing (120) is in the second position.

7. The foot valve assembly (110) according to claim 6, wherein the first sealing surface (123) and the second sealing surface (125) are arranged on the spring energized seal.

8. The foot valve assembly (110) according to any preceding claim, wherein at least a portion of the valve casing (120), such as the first sealing surface (123) and the second sealing surfaces (125), are configured to scrape against at least a portion of the surface of the elongated pipe (130) when moving between its first and second position.

9. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) is arranged between the elongated pipe (130) and a strainer (160) in a direction normal to the longitudinal axis (290) of the elongated pipe (130).

10. The foot valve assembly (110) according to any preceding claim, wherein at least the edges of the radial fenestration (140) running normal to the longitudinal axis (290) of the elongated pipe (130) are chamfered edges (145).

11. The foot valve assembly (110) according to any preceding claim, wherein a surface normal to the longitudinal axis (290) of the elongated pipe (130) and arranged at the second end (135) of the elongated pipe (130) and facing towards the first end (133), is sloped with a decline from a centre of the surface and towards the radial fenestration (140).

12. The foot valve assembly (110) according to any preceding claim, wherein the first sealing surface (123) and second sealing surface (125) and / or valve casing (120) is comprised of a polymer material with a glass transition temperature below 0 degrees Celsius, such as below -167 degrees Celsius, such as below -196 degrees Celsius, such as below -253 degrees Celsius.

13. The foot valve assembly (110) according to any preceding claim, wherein the valve casing (120) is an open-ended pipe.

14. The foot valve assembly (110) according to any preceding claim, comprising a strainer (160) enclosing the second end (135) of the elongated pipe (130) and covering the radial fenestration (140).

15. Foot valve assembly (110) according to an any preceding claim, comprising a strainer (160) arranged inside the elongated pipe (130) covering the radial fenestration (140).

16. A system for pumping fluid from a container (100) comprising- a pipe, such as an inner elongated pipe (180), for transporting the fluid- a foot valve assembly (110) according to any preceding claim connected to the pipe and arranged inside the container,- a motor arranged on the outside of the container (100) and connected to an impeller (150) arranged within the pipe via an impeller shaft (200).

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