An expansion tank includes a tank body mounted inside a housing forming a sump, and defining an internal expansion volume. A fluid inlet opening in the tank body is in communication with the sump and the expansion volume. A combination valve may be disposed on a lower end of the tank to control fluid flow between the sump and the expansion volume. The valve may be a combination duckbill valve and umbrella valve. Fluid enters the expansion volume through the umbrella valve when sump pressure exceeds expansion volume pressure by a first predetermined amount, and fluid exits the expansion volume through the duckbill valve to the sump when expansion volume pressure exceeds sump pressure by a second predetermined amount. The tank body may include a cover on which an inlet tube is formed.

An expansion tank includes a tank body mounted inside a housing forming a sump, and defining an internal expansion volume. A fluid inlet opening in the tank body is in communication with the sump and the expansion volume. A combination valve may be disposed on a lower end of the tank to control fluid flow between the sump and the expansion volume. The valve may be a combination duckbill valve and umbrella valve. Fluid enters the expansion volume through the umbrella valve when sump pressure exceeds expansion volume pressure by a first predetermined amount, and fluid exits the expansion volume through the duckbill valve to the sump when expansion volume pressure exceeds sump pressure by a second predetermined amount. The tank body may include a cover on which an inlet tube is formed.

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 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 pressure relief valve to balance the pressure between a cargo tank and the ambient atmosphere is described. The valve is so arranged that the velocity of the out flowing gas jet at no time is under a preset value when the valve is in open position. The valve comprises a valve body (2) designed to act against a valve seat (1) located in a structural outlet (5a) from the cargo tank, which valve body (2) is connected to a rod (7) extending into the structural outlet (5a) opening (5). The rod (7) is being supported and guided by a frame structure (6) extending into the structural outlet (5a) opening (5) and fixed to the structural outlet (5a).

A dual lock flow gate includes a valve with a flapper which may be fixed and/or locked in various positions for example to prevent fluid flow in the production string during lowering of the production string in the casing by blocking flow in the production string with the dual lock flow gate or for example to prevent rotation of the pump motor by preventing fluid flow in the production string.

A gate valve controls fluid communication from an inlet to an outlet relative to a reference pressure. A body defines a passage disposed in communication with the inlet, and an outlet port disposed in the passage communicates the passage with the outlet. A piston disposed in the passage is movable therein between first and second positions relative to the outlet port. The piston is movable in a first direction from the first position to the second position in response to an inlet pressure at the inlet. A gate disposed on the piston is biased transversely toward the outlet port. The gate moved by the piston adjusts flow from the passage to the outlet port. A pressure compensator disposed opposite the piston biases the piston in a second opposite direction from the second position to the first position. The pressure compensator has a chamber in communication with the reference pressure.

A valve unit is moveably accommodated in a valve housing having a valve seat. A coil spring is provided at an outer periphery of the valve unit to bias the valve unit in an axial direction of absorbing a backlash between a driving-side screw portion of a driving portion and a valve-side screw portion of the valve unit. Pressure losses of fluid at respective portions are so made to satisfy a relationship of P0P1P2, wherein P0 is a pressure loss of the fluid passing through an outlet port, P1 is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in a condition that the valve unit is most separated from the valve seat, and P2 is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions or passing through an axial gap formed between the coil spring and the valve seat.

A valve unit is moveably accommodated in a valve housing having a valve seat. A coil spring is provided at an outer periphery of the valve unit to bias the valve unit in an axial direction of absorbing a backlash between a driving-side screw portion of a driving portion and a valve-side screw portion of the valve unit. Pressure losses of fluid at respective portions are so made to satisfy a relationship of P0P1P2, wherein P0 is a pressure loss of the fluid passing through an outlet port, P1 is a pressure loss of the fluid passing through an axial space formed between the valve unit and the valve seat in a condition that the valve unit is most separated from the valve seat, and P2 is a pressure loss of the fluid passing through an axial gap formed between neighboring spring wire portions or passing through an axial gap formed between the coil spring and the valve seat.

A dual lock flow gate includes a valve with a flapper which may be fixed and/or locked in various positions.