A pressure relief valve includes a first port configured to receive a first gas at an input pressure, a second port configured to receive a second gas at a regulating pressure and a third port in fluid communication with the first port via an orifice and configured to output the first gas at an output pressure. The valve also includes a piston movable along an axis and configured to control the passage of gas through the orifice between the first port and the second port, such that the output pressure of the gas is dependent on the axial position of the piston, a resilient member configured to bias the piston. and a chamber at least partly defined by the piston and in fluid communication with the second port, such that the force exerted by the gas within the chamber on the piston acts against the action of the resilient member.

An oil pressure regulator valve assembly includes a cap comprising a polygonal section and a passage along an axis. A stem is at least partially telescoped into the passage along the axis; and a spring that biases the stem with respect to the cap.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

Pressure reducer (10) having a housing (11) with a valve (12) positioned in said housing (11), wherein in closed position the valve (12) separates an inlet pressure chamber (13) of the housing (11) from an outlet pressure chamber (14) of the housing (11), and in open position connects the inlet pressure chamber (13) and the outlet pressure chamber (14), wherein the valve (12) has a diaphragm (16) acting on a valve tappet (15), on which diaphragm, by providing a pressure reducing function, a spring force of a spring element (17) acting in the opening direction of the valve (12) acts on the one hand and a force that is a function of the pressure prevailing in the outlet pressure chamber (14) acting in the closing direction of the valve (12) acts on the other hand, wherein the valve (12) has, attached to the valve tappet (15), a valve body (21) which, in closed position, bears against a valve seat (22) in a sealing manner and which in open position is raised off the valve seat (22), and wherein the spring element (17) is arranged between spring plates (18, 19), namely between a spring plate (18) facing the diaphragm (16) and a spring plate (19) facing away from the diaphragm (16). A sensor (27) for detecting leakage is integrated into the pressure reducer.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

A pressure reduction plant including two or more valve assemblies arranged in parallel and including: pressure reducers for fuel gas from the supply pressure to the delivery pressure; pilot valves to transmit a control pressure to the pressure reducers when the delivery pressure reaches the calibration value of the pilot valves; derivation conduits to transmit the delivery pressure to the pressure reducers, the pilot valves and the pressure reducer devices; command lines to transmit the control pressure from the pilot valves to the pressure reducers. One of the pilot valves is configured with a calibration value greater than the calibration value of all the remaining pilot valves and each command line is configured to communicate with a control line.

A control line stabilizer includes a body defining an inlet chamber, an outlet chamber, a passageway connecting the inlet chamber and the outlet chamber, a first seat, and a second seat. A disc is disposed in the passageway and is movable between a first closed position, in which the disc engages the first seat, an open position, in which the disc is spaced away from the first seat and the second seat, and a second closed position in which the disc engages the second seat. A first spring is disposed in the outlet chamber and is operatively coupled to the disc. A second spring is disposed in the inlet chamber and is operatively coupled to the disc. The disc restricts fluid flow through the passageway by moving to the first closed position and by moving to the second closed position.

A method to operate a pressure regulator including an inlet flow passage and an outlet flow passage; a plunger reciprocally between the inlet and outlet flow passages, wherein an axis of the plunger is offset from an axis of the inlet flow passage and the plunger moves with respect to a stationary valve seat to regulate pressure of liquid flowing through the pressure regulator.

A pressure regulator is described. The pressure regulator includes a diaphragm, a vent limiting component, a relief valve stem, and a main spring. The diaphragm has an inner edge that defines a main relief opening. The vent limiting component is positioned within the main relief opening and adjacent to an upper side of the diaphragm about the inner edge. The vent limiting component defines an orifice, wherein the lower side of the diaphragm is in fluid communication with the upper side of the diaphragm through the orifice. The relief valve stem is positioned adjacent to a lower side of the diaphragm about the inner edge. The main spring is configured to provide a force to the vent limiting component to removably secure the vent limiting component to the diaphragm.

The present invention relates to a liquid metering device (1) for metering pumps which is formed by a main longitudinal conduit (2) with a first and second opposite ends (2.1, 2.2) comprising a fluid inlet (3) at the first end (2.1) located perpendicular thereto, a first outlet (4) at the second end (2.2), and a first connection (5) to backpressure control means (6), a second connection (7) to safety means (8), acting in parallel and in an independent manner, and a second overpressure outlet (9), arranged in one and the same connecting section (10), and where said connecting section (10) has an inclined wall (11) allowing the fluid to exit through the first outlet (4) for a fluid pressure equal to or greater than a fixed backpressure value and the fluid to exit through the second outlet (9) for a pressure greater than a fixed value.