131results about "Pressure difference control" patented technology

The invention provides an intelligent gas pipeline differential pressure safety monitoring Internet of Things system and method and a storage medium. The Internet of Things system comprises a gas company management platform and a plurality of other platforms. The method is executed by a gas company management platform and comprises the following steps: acquiring a pressure difference data matrix of a current gas pipe network; based on the pressure difference data matrix, determining an abnormity judgment result of the current gas pipe network; determining anomaly probability distribution based on the differential pressure data matrix in response to the existence of the anomaly; generating an operation instruction set based on the abnormal probability distribution; and based on the differential pressure data matrix, generating a voltage regulation instruction, the voltage regulation instruction being configured to control a voltage regulation device to perform voltage regulation. The method can also be operated after a computer instruction stored in a computer readable storage medium is read. According to the Internet of Things system and method, real-time and accurate monitoring and analysis of the pressure difference of the gas pipeline can be realized, and safe and stable operation of a gas pipeline network is ensured.

Provide are an IoT system, a method, and a storage medium for smart gas pipeline pressure difference safety monitoring. A gas company management platform of the IoT system is configured to: obtain a pressure difference data matrix of a current gas pipeline network from a gas equipment object platform; determine an abnormality judgment result for the current gas pipeline network based on the pressure difference data matrix; in response to determining that the abnormality judgment result indicates an abnormality, determine an abnormality probability distribution of the current gas pipeline network based on the pressure difference data matrix; generate an operation instruction set based on the abnormality probability distribution; generate a pressure adjustment instruction based on the pressure difference data matrix, and send the pressure adjustment instruction to the gas equipment object platform to control a pressure adjustment device to regulate an abnormal gas pipeline in the current gas pipeline network.

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 hybrid flow ratio controller system is provided, which includes an inlet configured to receive a total inlet fluid flow and three or more distribution channels. Each of the three or more distribution channels has a respective variable flow control valve and carries a respective portion of the total inlet fluid flow. The hybrid flow ratio controller further includes a controller operatively coupled to the respective variable flow control valves. The controller is configured to control a flow rate of at least a first distribution channel according to a predetermined flow ratio of the inlet fluid flow in accordance with a flow ratio control mode, to control a flow of at least a second distribution channel in either a flow rate control mode or a pressure control mode, and to control a third distribution channel in an overflow mode.

A gas supply line control system and method for preventing flow reversal due to an upstream pressure drop in a natural gas supply line, the system and method include setting a threshold low pressure for the upstream gas flow, continually sensing the upstream pressure, activating a trigger valve when the upstream pressure falls below the threshold low pressure, and closing a control valve in response to the trigger valve to prevent reversal of flow in the gas supply line.

A system of controlling the capture of emissions from an exhaust emitter includes a housing including an inlet, a first outlet, and a second outlet; an adapter configured to attach to the exhaust emitter and the inlet of the housing; an attachment assembly coupled to the exhaust emitter, the attachment assembly including at least one leg pivotably coupled to the adapter; at least one valve coupled to the housing; and a control unit capable of communicating with the at least one valve to control the emission of exhaust through the device.

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.

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, different range of angular positions in which the second port (12, 22) is in fluid communication with the third port (13, 23).

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 modular hydrogen generation system (“system”) comprises a high-pressure containment vessel (“vessel”) defining a hydrogen plenum. The system also comprises a hydrogen generation insert (“insert”) shaped to be received in the hydrogen plenum. The insert includes a cover, one or more proton-exchange membrane (“PEM”) cells, an oxygen-water separator; and a passive dual regulator with relative differential venting (“regulator”). The insert is inserted into the hydrogen plenum such that hydrogen and oxygen can be produced at an interior pressure of from 200 to 6,000 psi. The regulator receives oxygen from the oxygen-water separator and hydrogen from the hydrogen plenum and regulates pressure imbalances between an oxygen-side of the system, vents oxygen to an exterior of the high-pressure containment vessel, and vents hydrogen to an exterior of the vessel to allow collection of hydrogen and oxygen and avoid rupture of the one or more PEM cells during operation.

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).

The differential pressure sensing apparatus has a housing enclosing three chambers and a piston which slides within the housing chambers where two fluids cause movement of the piston corresponding to a differential pressure between the locations. The piston includes a first cylindrical section 202 coupled between two second cylindrical sections of lesser diameter 204, and having first and second annular surfaces 512A&B joining the first and the two second sections. A third annular surface 510 at the opposite end of one of the second cylindrical sections has a surface area equal to that of the first and second annular surfaces. The housing had first and second chambers (302, 306 in figure 3) to apply first and second fluid pressures to the first and second annular surfaces and a third chamber (310 in figure 3) in which the third annular surface applies pressure to a fluid based on the difference between the first and second fluid pressures. A method of operating the apparatus is also disclosed.

The differential pressure sensing apparatus has a housing enclosing three chambers and a piston which slides within the housing chambers where two fluids cause movement of the piston corresponding to a differential pressure between the locations. The piston includes a first cylindrical section 202 coupled between two second cylindrical sections of lesser diameter 204, and having first and second annular surfaces 512A&B joining the first and the two second sections. A third annular surface 510 at the opposite end of one of the second cylindrical sections has a surface area equal to that of the first and second annular surfaces. The housing had first and second chambers (302, 306 in figure 3) to apply first and second fluid pressures to the first and second annular surfaces and a third chamber (310 in figure 3) in which the third annular surface applies pressure to a fluid based on the difference between the first and second fluid pressures. A method of operating the apparatus is also disclosed.

Apparatus to compress a fluid (e.g. natural gas) has two three-way valves coupled between a first compressor 106A and second compressor 106B having two operatively coupled pistons in cylinders 110A,11

A nitrogen generation system includes a nitrogen generator and a bypass device. The nitrogen generator receives air and outputs nitrogen using the air along a first flow path to an outlet. The bypass device is coupled with an air source and the nitrogen generator. The bypass device controls flow of air from the air source to flow along the first path through the nitrogen generator or along a second path to the outlet based on a pressure condition.

A pressure control system for pressure control of at least two pressurized fluid systems comprises a duct for each fluid system having an inlet connectable to the respective fluid system and an outlet, a pressure control valve arranged within each of the ducts to control the fluid flow from the inlet to the outlet of the duct, wherein the pressure control valves are pilot-operated pressure relief valves having an inlet port for a pilot gas to affect a cracking pressure of the pressure control valves, wherein the pressure control system further comprises a common pilot gas buffer system, which is connected to each of the inlet ports of the pressure control valves for a simultaneous pressure control of the fluid systems.

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.

In some examples, a pressure reducing valve includes a valve body defining a defining a flow path and a restricting element within the flow path. A sensing element is configured to modify a position of the restricting element in the flow path. The sensing element defines a first area in fluid communication with the flow path and a second area fluidly isolated from the flow path. The pressure reducing valve includes control circuitry configured to determine a differential pressure over a section of the flow path, determine a position of the restricting element, and determine a flow rate based on the differential pressure and the position of the restricting element.

A flow control system in which processing circuitry repeatedly performs control cycles for meeting a requested low flow rate which is lower than a minimum measurable flow rate. Each control cycle comprises: i) moving a closing member towards a closed position until it reaches a waiting position, ii) keeping the closing member in the waiting position, and then iii) moving the closing member to a measuring position, the time elapsed being t1, an estimated or calculated fluid volume V1 has pass through the valve body during t1, and then iv) maintaining the closing member at said measuring position while continuously integrating the measured flow rate over a second time period t2, thereby obtaining a measure of a second volume V2 of fluid flowing through the valve body during the second time period t2, and then v) determining that the cycle is completed when (V1 + V2) / (t1 + t2) equals said requested low flow rate.

A passive dual modulation regulator is provided that responds to a pressure differential between the hydrogen and oxygen sides of one or more proton exchange membrane (PEM) cells. The passive dual modulation regulator includes a flexible diaphragm clamped along its periphery between hemispherical chambers. A bidirectional valve assembly extends through the flexible diaphragm and includes opposing valve plugs for selectively closing the exhaust ports of each hemispherical chamber. Large or sustained pressure imbalances between the hydrogen and oxygen sides of the hydrogen generation system are avoided without any type of active control input, and as a result, PEM rupture is generally avoided.

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

Fuel cell arrangement (10) for an H2 / O2 fuel cell (16), comprising: - an anode (26) at which H2 (14) is oxidized during operation and which is connected to an H2 inlet (48) for supplying H2 (14) to the anode (26), wherein a valve (58) with a valve seat (62) and a valve element (60) is arranged in the H2 inlet (48), which valves cooperate in a closed position to interrupt an inflow of H2 (14) from the H2 inlet (48) to the anode (26), - a cathode (30) at which O2 (28) is reduced during operation and which is connected to an O2 inlet (50) for supplying O2 (28) to the cathode (30), wherein a differential pressure control device (52) for controlling a differential pressure between the H2 inflow (48) and the O2 inflow (50) is arranged between the H2 inflow (48) and the O2 inflow (50), wherein the differential pressure control device (52) has a fluid connection (52) between the H2 inflow (48) and the O2 inflow (50), in which a deflection force (F A ) deflectable membrane (56) is arranged for closing the fluid connection (54), wherein a pin (64) is coupled to the deflectable membrane (56) and the valve element (60) in such a way that the pin (64) presses the valve element (60) away from the valve seat (62) in the opening direction when the membrane (56) is deflected in the direction of the H2 inflow (48).

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.

The invention relates to a method for determining a pressure difference between a high-pressure region and a low-pressure region of a valve 1 for refrigerant, comprising the method steps: adjusting a valve body 3 of the valve, arranged in a valve chamber 2, from a first valve position to a second valve position by means of an electric actuator 4, in particular a stepper motor, of the valve; measuring an electrical energy, in particular an electrical power and / or a phase current, drawn by the electric actuator 4 to adjust the valve body 3; comparing the measurement with a data set whose data correspond to an electrical energy required to adjust the valve body by the electric actuator in a depressurized state of the valve, in order to determine the pressure difference Δp. The invention further relates to a corresponding valve and a motor vehicle.