42results about "Pressure difference control" patented technology

A force balanced valve apparatus for downhole steering tools that includes a valve actuator (214), first and second valve bodies (218, 220), an inverse travel linkage (230), and a flow twisting section (208) for pressure balancing. The flow twisting section reorients fluid flow paths by approximately 180°from an uphole valve section (207) of the apparatus to a downhole steering pressure generation section (210). Hydraulic forces are balanced across the valve apparatus are balanced by force balancing pistons (222, 224) responsive to pressures in the steering pressure generation section. The force balanced valve apparatus may generate steering pressure differentials for directional drilling and mud pulse telemetry by modulating fluid flow.

A differential pressure controller comprises a differential pressure plug configured to change a variable cross-section of a flow passage between an inlet and an outlet of a valve body. A first movable membrane is connected to the differential pressure plug and has a first high-pressure membrane side and an opposite low-pressure membrane side. A second movable membrane is connected to the differential pressure plug and has a second high-pressure membrane side and an opposite intermediate-pressure membrane side. A spring element is arranged to exert a spring force on the differential pressure plug and arranged to hold the differential pressure plug in an end position when a differential pressure (P1-P2) between the second high-pressure membrane side and the intermediate-pressure membrane side is below a threshold value, wherein when said differential pressure (P1-P2) subsequently exceeds the threshold value the second movable membrane causes the differential pressure plug to move from said end position to reduce said variable cross-section of the flow passage.

The present invention relates to a pressure independent commissioning unit for connection to for example a heat exchanger comprising a H-body bypass arrangement having primary and secondary inlets (12A; 10A) and outlets (12B; 10B), forming the sides of the H-body and communication between them via a bypass (13) forming the centre of the H-body; containing: - a bonnet mechanism (18) connecting the primary inlet (12A) and the bypass (13), - a pressure independent valve connecting the secondary inlet (10A) to the bypass (13), wherein the flow path through the outlets (12B; 10B) and inlets (12A; 10A) can be controlled by rotation of the bonnet mechanism (18) and closing the pressure independent valve.

A control valve (1) for selectively regulating a fluid flow from one of two sources, comprising a housing with a first inlet (11), a second inlet (12), and an outlet, a flow selection element (55) rotatable around a centre axis (A) to bring the first inlet (11) or the second inlet (12) is in fluid communication with the outlet, said flow selection element (55) comprising a flow passage (51) comprising an axial section (51a) extending a distance along the centre axis (A) for the flow passage to be connectable at a first axial position (T1) to selectively one of the inlets (11; 12) and to be connectable to the outlet at a second axial position (T2), and a differential pressure regulator (100) arranged in the housing at an axial end of the control valve (1) and comprising a throttle member (106) axially movable along the centre axis (A).

A differential pressure controller comprises a differential pressure plug configured to change a variable cross-section of a flow passage between an inlet and an outlet of a valve body. A first movable membrane is connected to the differential pressure plug and has a first high-pressure membrane side and an opposite low-pressure membrane side. A second movable membrane is connected to the differential pressure plug and has a second high-pressure membrane side and an opposite intermediate-pressure membrane side. A spring element is arranged to exert a spring force on the differential pressure plug and arranged to hold the differential pressure plug in an end position when a differential pressure (P1-P2) between the second high-pressure membrane side and the intermediate-pressure membrane side is below a threshold value, wherein when said differential pressure (P1-P2) subsequently exceeds the threshold value the second movable membrane causes the differential pressure plug to move from said end position to reduce said variable cross-section of the flow passage.

Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a first housing including a first port, the first port fluidly coupled to a first location, first fluid to flow into the first port from the first location, a second housing coupled to the first housing, the second housing including a second port, the second port fluidly coupled to a second location, second fluid to flow into the second port from the second location, and a piston slidably disposed between the first and second housings, the first and second fluids to cause movement of the piston, the movement of the piston corresponding to a differential pressure between the first and second locations.

This invention belongs to the field of petroleum exploration technology and discloses a pressure-controlled gas volume testing system and method. The pressure-controlled gas volume testing system includes an inner cylinder, a pressure replenishing component, a gas volume testing component, a pressure gauge, a pressure control valve, and a control component. The pressure replenishing component is connected to the inner cylinder via a pipeline; the gas volume testing component is connected to the pressure replenishing component via a pipeline; the pressure gauge is used to test the pressure of the inner cylinder and the pressure replenishing component; the pressure control valve includes a first pressure control valve and a second pressure control valve, the first pressure control valve being located between the inner cylinder and the pressure replenishing component, and the second pressure control valve being located between the pressure replenishing component and the gas volume testing component; the control component is configured to control the opening of the first and second pressure control valves when the pressure difference between the first and second pressure gauges reaches a set threshold. The pressure-controlled gas volume testing system provided by this invention can accurately measure the gas volume in the pipeline at each pressure range, improving the accuracy of the measurement.

A control system for controlling the storage of metabolically active produce in a defined confined environment, said control system comprising at least one gas analyzing and one pressure measurement means comprising a control unit for determining an adjusted gas medium composition of the confined environment for protecting the produce against metabolic degradation; at least one operating / actuating means for adapting the gas medium in the confined storage environment based on said determined adjusted gas medium composition; wherein the control unit is adapted for determining the adjusted gas medium composition based on a mathematical model of the system that determines a metabolic coefficient of the produce by combining measured, changes of gas composition in the confined environment with dynamic pressure changes in the confined space. The value of the metabolic coefficient is used as input for a control algorithm to continuously adjust the gas composition in the confined space in response to the metabolic activity of the produce.

To provide an operation facility for an unmanned aircraft including a passage space which can stabilize flying of a rotor type unmanned aircraft.SOLUTION: An operation facility for a rotor type unmanned aircraft includes: a passage space 30 which is formed so as to extend in a vertical direction Z and in which an unmanned aircraft moves upward or downward; and an atmospheric pressure control system 40 which controls an atmospheric pressure in the passage space 30. The atmospheric pressure control system 40 provides control so that an atmospheric pressure above the unmanned aircraft becomes lower than an atmospheric pressure below the unmanned aircraft.SELECTED DRAWING: Figure 2

Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a piston including a first cylindrical section having a first diameter and first and second annular surfaces, each of the first and second annular surfaces having a first surface area, and second cylindrical sections having a second diameter less than the first diameter, the first cylindrical section between the second cylindrical sections, and a housing including a first chamber to receive a first fluid, the first fluid to apply a first pressure on the first annular surface, a second chamber to receive a second fluid, the second fluid to apply a second pressure on the second annular surface, and a third chamber including a third fluid, the third annular surface to apply a third pressure on the third fluid, the third pressure corresponding to a difference between the first pressure and the second pressure.

In order to suppress a flow rate that is unexpectedly output, and quickly stabilize the output flow rate, provided is a fluid control device 100 which is provided with a fluid control valve 1, an upstream pressure sensor 21, a fluid resistance element 22, and a downstream pressure sensor 23 are disposed in this order from the upstream side, the fluid control device comprising: an actual flow rate calculation unit 24 which calculates the flow rate on the basis of the pressures measured by the upstream pressure sensor 21 and the downstream pressure sensor 22; a delayed flow rate calculation unit 4 which calculates a delayed flow rate by causing a response delay in the calculated flow rate calculated by the actual flow rate calculation unit 24; and a flow rate output unit 5 which compares an absolute difference between the predetermined reference value and the calculated flow rate and an absolute difference between the reference value and the delayed flow rate, and outputs the calculated flow rate or the delayed flow rate with the smaller absolute difference.

A passive dual modulating regulator that responds to a pressure differential between a hydrogen-side and an oxygen-side of one or more proton-exchange membrane (PEM) cells is provided. The passive dual modulating regulator includes a flexible diaphragm that is clamped along its periphery between hemispherical chambers. A bi-directional valve assembly extends through the flexible diaphragm and includes opposing valve plugs for selectively closing the output ports of the respective hemispherical chambers. Large or sustained pressure imbalances between the hydrogen-side and the oxygen-side of a hydrogen generation system are avoided without active control inputs of any kind, and consequently a rupture of the PEM is entirely avoided.

A fluid control device includes a fluid resistance element provided to a channel, an upstream pressure sensor configured to detect an upstream pressure of the fluid resistance element, a downstream pressure sensor configured to detect a downstream pressure of the fluid resistance element, a flow rate calculating unit configured to calculate a flow rate flowing through the channel based on the upstream and downstream pressures, a valve provided upstream of the upstream pressure sensor or downstream of the downstream pressure sensor, and a valve control unit configured to control the valve based on the calculated flow rate. When the valve is fully closed, the flow rate calculating unit is configured to calculate the flow rate by switching a first flow rate calculation formula that is used when the valve is open, to a second flow rate calculation formula that is different from the first flow rate calculation formula.

One embodiment of a media handling system (5) is disclosed for mixing and or entraining grinding media (15) with a liquid media (10) for supply to a selected destination (D). In one form, the system (5) comprises a first media transfer module (30) configured operable for providing a flow of liquid media (10) having a respective flow condition to a first inlet (11) by way of which liquid media is receivable by the system (5). The system (5) comprises a second media transfer module (25) arranged in fluid communication with and downstream of both of the first inlet (11) and a second inlet (16) by way of which grinding media (15) is receivable by the system (5). The second media transfer module (25) is configured operable for supplying to the selected destination (D) a mixed flow of liquid and grinding media having a respective flow condition. In operation, one or both of the first (30) and second media transfer modules (25) are configured operable relative to the other for modifying one or both of the respective flow conditions so as to be operable or cooperable for facilitating a drawing or urging of a flow of the grinding media (15) into the system (5) via the second inlet (16) for controllably modifying a concentration of grinding media in the mixed flow of liquid and grinding media so as to converge toward and or substantially maintain a target concentration of grinding media (15) determined to be suitable for enabling supply of the mixed flow to the selected destination (D) by the second media transfer module (25).

A valve (1) comprises a valve housing (2) with a flow control arrangement (6); and a differential pressure regulator (7) for maintaining a constant differential pressure across the flow control arrangement (6), wherein the differential pressure regulator (7) comprises a cup-shaped, valve member (8) positioned in a valve chamber (13) in the valve housing (2), the valve member (8) comprising a rim (9), wherein the valve chamber (13) comprises a space (17) around the valve member (8) said space (17) comprising an annular area (18) radially outside the rim (9), wherein an inlet passage (19) from a valve inlet (4)10 of the valve to the flow control arrangement (6) comprises a smallest inlet cross-sectional area (20), and a ratio between the size of the annular area (18) and the size of the smallest inlet cross-sectional area (20) is at least 2.4.

A control device for controlling the pressure of a fluid, and a porometer that includes the control device. A regulating unit includes a pipe system for conveying a fluid and a regulating device associated with the pipe system. The regulating unit includes a first pressure regulator and a second pressure regulator, and the first and second pressure regulators each generate a regulating variable for an actuator for configuring the flow of the fluid in the pipe system; and a controller. The first pressure regulator is arranged on the inlet side in the pipe system. The second pressure regulator is arranged in series downstream of the first pressure regulator with respect to the direction of flow of the fluid in the pipe system. The controller is configured to specify a pressure setpoint value as a reference variable for the first pressure regulator and the second pressure regulator.

A pressure regulator for regulating a differential pressure between a first fluid pressure of a first fluid and a second fluid pressure of a second fluid is disclosed. The pressure regulator has a valve between a regulator body and a valve member. The valve member is moveably disposed within a first longitudinal bore of the regulator body between a first-fluid-pressure sensing chamber and a second-fluid-pressure sensing chamber. The first-fluid-pressure sensing chamber is in fluid communication with the first-fluid inlet and the second-fluid-pressure sensing chamber is in fluid communication with the second-fluid port. The valve member is moveable between a closed position where a cross-sectional flow area through the valve is below a predetermined level and an open position where the cross-sectional flow area through the valve is above the predetermined level.

Hydraulic systems and associated methods configured to reduce leakage past a spool valve when the system is in a neutral state. Leakage reduction is achieved by shifting the spool valve within the spool bore. The amount of shifting can be controlled by a pressure controller that sets one or pressures in the system and actively / dynamically adjusts the system to achieve a desired pressure or set of pressures by shifting the spool valve.

A control valve (1) for regulating a water flow to or from a device in a HVAC system, having a valve body (2), a shaft (15,25) rotatable about a valve axis X, a first ceramic plate (16,26) and a second ceramic plate (17,27) mounted about the shaft (15,15',15''), the first ceramic plate (16,26) being stationary, while the second ceramic plate (17,27) is coupled to the shaft (15,15',15'') to rotate with the shaft (15,15',15''), the first ceramic plate (16,26) having first- and second through-going openings (31,32,41,42), the second ceramic plate (17,27) having one through-going opening or recess (33,43), first-, second- and third, ports (11,21,12,22,13,23), wherein the second ceramic plate (17,27) is rotatable: to a first range of angular positions in which the first port (11, 21) is in fluid communication with the third port (13, 23), and to a second range of angular positions in which the second port (12, 22) is in fluid communication with the third port (13, 23), wherein the first range of angular positions does not overlap with the second range of angular positions.

The valve can include a self-cleaning feature that can be configured to at least partially displace material from a portion of the valve. Such a valve can be used in a pressure exchanger. The present application also provides a method of operating a valve.

A body structure includes an inlet port (15) that receives fluid from a delivery device, a first outlet port (12) that connects to a top-fill line in communication with a cryogenic tank, a second outlet port (13) that connects to a bottom-fill line in communication with a cryogenic tank and a slider tube cylinder (19). A cylinder housing (22) is connected to the body structure and has a pressure comparison cylinder with an upper volume (23) and a lower volume (27), with the latter in fluid communication with a cryogenic tank. A piston (21) slides within the pressure comparison cylinder and a piston shaft is connected to the piston. A pressure regulator (24) is in fluid communication with the upper volume of the pressure comparison cylinder and the slider tube cylinder. A slider tube (29) is connected to the piston shaft and slides within the slider tube cylinder. The slider tube cylinder directs fluid to a top-fill line through the first outlet port when a pressure in the lower volume exceeds a pressure setpoint and fluid to a bottom-fill line through the second outlet port when the pressure in the lower volume is below a pressure setpoint.

To improve flow rate measurement accuracy in a state in which a valve is fully closed.SOLUTION: A fluid control device comprises: a fluid resistive element 33 which is provided on a flow path 2R; an upstream pressure sensor 31a which detects an upstream pressure P1 of the fluid resistive element 33; a downstream pressure sensor 31b which detects a downstream pressure P2 of the fluid resistive element 33; a flow rate calculation unit 4a which calculates a flow rate Q for a flow through the flow path 2R based on the upstream pressure P1 and the downstream pressure P2; a valve 32 which is provided upstream of the upstream pressure sensor 31a or downstream of the downstream pressure sensor 31b; and a valve control unit 4b which controls the valve 32 based on the flow rate Q calculated by the flow rate calculation unit 4a. When the valve 32 is fully closed, the flow rate calculation unit 4a calculates the flow rate Q by switching from a first flow rate calculation method Eq1 used when the valve 32 is open to a second flow rate calculation method Eq2 different from the first flow rate calculation method Eq1.SELECTED DRAWING: Figure 1

Mass flow controllers that can provide for improved bleeding time and can be manufactured with less complexity and cost are provided. A mass flow controller includes a body having a valve outlet bore defining a flow path and an adjustable valve configured to control flow of a gas through the flow path. A valve element includes an outlet orifice of the adjustable valve and is disposed within the bore. The mass flow controller further includes a pressure drop element disposed coaxially with the valve element within the bore. An upstream pressure sensor is configured to detect a pressure at a location in the flow path between the adjustable valve and the pressure drop element, and a controller is configured to determine a flow rate through the flow path based on pressure as detected by the upstream pressure sensor.

The invention relates to a constant differential pressure valve arrangement (3). The housing (4) of the constant differential pressure valve arrangement (3) comprises a fluid transfer chamber (26) for the shutter member (27) of the constant differential pressure valve arrangement (3). A shielding wall member (39) is arranged between the fluid transfer chamber (26) and the shutter member (27). The shielding wall member (39) is designed and arranged in a way that it at least significantly reduces dynamic fluid flow forces in the gap (37) between the shielding wall member (39) and the shutter member (27).

The invention relates to a control valve (10) for selectively controlling a fluid flow to a heat exchanger (30), in particular a heating element, a heating or cooling convector, or an underfloor heating or surface heating system, wherein the control valve (10) is designed as a 6-way ball valve, comprising: - an inlet selection element (4) which is arranged downstream of the first and second inlets (1, 2) and upstream of the outlet (3), the inlet selection element (4) being movable between a first position and a second position; - an outlet selection element (8) which is arranged downstream of the return flow inlet (5) and upstream of the first and second return flow outlets (6,7), the outlet selection element (8) being movable between a first position and a second position, the inlet selection element (4) and / or the outlet selection element (8) being designed such that it is possible to control the flow through the control valve (10) to the outlet (3) and / or the return flow outlets (6, 7), the control valve (10) comprising a differential pressure controller (9) which is arranged downstream of the return flow inlet (5) and upstream of the outlet selection element (8) in the flow direction.

A pressure regulating valve is provided that includes a housing, a sleeve, a piston, an adjustment nut, and a piston spring. The housing includes a sleeve bore. The sleeve has a side wall that extends axially between a base end and a distal end, an end wall disposed at the base end, an interior cavity that extends axially between the base end and the distal end, and a plurality of ports. The sleeve is disposed within the sleeve bore. The piston extends axially between a land end and a spring end. The adjustment nut is engaged with the sleeve, and is configured for axial translation relative to the sleeve. The piston spring is disposed to provide a spring force on the adjustment nut and the piston. The sleeve includes an asymmetric feature that engages with the housing to prevent rotation of the sleeve relative to the housing.

A pressure regulating valve (22) is provided that includes a housing (24), a sleeve (30), a piston (32), an adjustment nut (34), and a piston spring (36). The housing (24) includes a sleeve bore (26). The sleeve (30) has a side wall (42) that extends axially between a base end (44) and a distal end (46), an end wall (48) disposed at the base end (44), an interior cavity (50) that extends axially between the base end (44) and the distal end (46), and a plurality of ports (28). The sleeve (30) is disposed within the sleeve bore (26). The piston (32) extends axially between a land end (56) and a spring end (58). The adjustment nut (34) is engaged with the sleeve (30), and is configured for axial translation relative to the sleeve (30). The piston spring (36) is disposed to provide a spring force on the adjustment nut (34) and the piston (32). The sleeve (30) includes an asymmetric feature (68, 68A, 68C, 68D) that engages with the housing (24) to prevent rotation of the sleeve (30) relative to the housing (24).

According to the embodiments disclosed herein, a process management device includes: an air supply unit and an exhaust unit, each operating at a rotational speed to form an airflow to a slurry; and a damper for adjusting the airflow. The process management device may also include: a sensor for measuring the pressure difference between at least some of a plurality of drying zones for drying the slurry; and a controller for adjusting at least one of the rotational speed of the air supply unit, the rotational speed of the exhaust unit, or the opening degree of the damper.

Differential pressure sensors, control, and associated methods are disclosed. An example apparatus (100) includes a first housing (106) including a first port (102), the first port (102) fluidly coupled to a first location, first fluid to flow into the first port (102) from the first location, a second housing (108) coupled to the first housing (106), the second housing (108) including a second port (104), the second port (104) fluidly coupled to a second location, second fluid to flow into the second port (104) from the second location, and a piston (200) slidably disposed between the first and second housings (106, 108), the first and second fluids to cause movement of the piston (200), the movement of the piston (200) corresponding to a differential pressure between the first and second locations.