A regulating piston for a pressure regulating shut-off valve comprises: a tubular sleeve; a first closed end; a second open end; a port defined in the tubular sleeve between the first and second ends, arranged to permit fluid flow between the exterior and interior of the regulating piston; and a support structure disposed within the piston arranged to direct fluid flow between the port and the second open end. The piston can be included in a pressure regulating shut-off valve, and methods for manufacturing the piston and valve.

A device is provided for controlling the flow of a fluid through a conduit from an upstream side to a downstream side of the device. The device includes a valve aperture, a cylindrical mounting member on the downstream side of the valve aperture, a valve member on the outside of the cylindrical mounting member that moves reciprocally to open and close the valve aperture, a control volume defined between the cylindrical mounting member and the valve member, an arrangement for introducing a control pressure into the control volume, and a seal between the outer surface of the cylindrical mounting member and the inner surface of the valve member that substantially seals the control volume. The valve member is acted on by the pressure of the upstream side (P.sub.1) and the control pressure (P.sub.4) so as to be moved by the difference between these pressures.

A regulator, e.g., a pressure regulator for supplying a high pressure fuel to an engine, is disclosed. The regulator includes at least a pair of annular bearings composed of a rigid synthetic resin interposed along a length direction of a pressure regulating valve body at a predetermined distance at a position on a valve seat side in an axial direction of a gap formed between the pressure regulating valve body and an inner wall of the passage formed in a body main body.

A pressure regulating and pressure relief valve, has a valve body defining an inlet port, outlet port, valve seat and pressure relief opening. A pressure regulating plug is displaced during a first portion of a motion from an open position, which provides a continuous flow path from the inlet port to the outlet port, to a closed position in which the plug is closed against the valve seat to obstruct the continuous flow path. A spring biases the plug to the open position. An actuation surface is exposed to a pressure at the outlet port that displaces the plug against the spring bias toward the closed position. Further displacement of the plug beyond the closed position during a second portion of the motion that is beyond a range of the first portion of the motion, opens a relief flow path from the outlet port through the pressure release opening.

A method of functionally testing a pressure actuated regulator. The pressure actuated regulator includes a valve member arranged to open a valve aperture, and a control pressure volume in which a control pressure is set to act on the valve member. The method includes applying a force to the valve member, and taking measurements representative of the pressure of fluid in the control pressure volume and of the mass flow rate of the fluid into the control pressure volume while the force is being applied to the valve member. The method also includes isolating the control pressure volume and allowing a pressurised fluid in the control pressure volume to leak out of the control pressure volume, and taking measurements representative of the pressure of fluid in the control pressure volume while the fluid leaks out of the control pressure volume.

A fluid regulator includes an actuator assembly disposed in a valve body. A sleeve includes a cylindrical wall, a first plate, and a second plate. Each of the first plate and the second plate is disposed in a cavity of the sleeve. A stem extends through the sleeve and is axially aligned with a longitudinal axis of the body, and includes a passage extending partially through the stem. The actuator assembly includes first and second pistons. First, second, third, and fourth chambers are separately disposed between the sleeve, the first or second plate, or the first or second piston. The first and third chambers are in fluid communication, and the second and fourth chambers are in fluid communication via the passage of the stem. The actuator assembly actuates a control element in response to a fluid pressure receivable in the first, second, third, and/or fourth chambers.

A gauge for a hybrid pressure and flowgauge regulator includes first indicia and second indicia. The first indicia provides an indication of a flow rate of a gas exiting an outlet of the hybrid pressure and flowgauge regulator when the gas exits with a pressure below a gauge threshold pressure. The second indicia provides an indication of the pressure of the gas exiting the outlet of the hybrid pressure and flowgauge regulator when the pressure of the gas exiting the outlet is above the gauge threshold pressure.

A device for controlling the flow of a fluid through a conduit from an upstream side of the device to a downstream side of the device is provided. The device includes an upstream valve casing defining an inlet, a downstream valve casing defining an outlet aperture, and a valve core secured between the upstream valve casing and the downstream valve casing. The upstream valve casing, the downstream valve casing and the valve core are formed as discrete parts. The valve core includes a housing defining a control volume. The valve member is mounted on the housing and positioned on the upstream side of the outlet aperture, the valve member being arranged to move reciprocally to selectively open and close the outlet aperture, thereby controlling flow of the fluid through the outlet aperture.

The present disclosure discloses a pressure reducing valve and a pull-out faucet. The pressure reducing valve comprises a valve body, a piston and an elastic member, the valve body comprises a connector, the connector comprises a water passing hole penetrating from an inner side to an outer peripheral surface of the connector, a sealing member encompasses the connector, the piston comprises a bottom wall and a peripheral wall extending upward from a periphery of the bottom wall, an inner peripheral surface of the peripheral wall comprises a discharging section and a sealed section disposed between the discharging section and the bottom wall, the discharging section defines one or more discharging passages, the peripheral wall of the piston is configured to slidably encompass an outer side of the connector, and the elastic member configured to drive the piston to be separated from the connector.

A pressure regulating and pressure relief valve, has a valve body defining an inlet port, outlet port, valve seat and pressure relief opening. A pressure regulating plug is displaced during a first portion of a motion from an open position, which provides a continuous flow path from the inlet port to the outlet port, to a closed position in which the plug is closed against the valve seat to obstruct the continuous flow path. A spring biases the plug to the open position. An actuation surface is exposed to a pressure at the outlet port that displaces the plug against the spring bias toward the closed position. Further displacement of the plug beyond the closed position during a second portion of the motion that is beyond a range of the first portion of the motion, opens a relief flow path from the outlet port through the pressure release opening.