A shuttle valve has a valve body including a first valve seat defining a first fluid inlet, a second valve seat defining a second fluid inlet, and a center portion that is connected to the valve seats, the center portion defining a fluid outlet and a bore. A moveable member is moveable within the bore between a first position against the first valve seat and a second position against the second valve seat to control the flow of fluid from either of the first or second inlet to the outlet. The moveable member may be configured to have a unitary construction formed of a single component, by which a unitary shell defines a substantially hollow interior. The moveable member has a hollow interior and a weep hole for equalizing pressure between the hollow interior and exterior of the moveable member.

A valve including a valve housing, a casing, a spring guide, and a retaining cup. The casing may be disposed within the valve housing and may include a bore. The spring guide may be disposed within the bore and the retaining cup may be disposed partially around the casing to engage and retain the spring guide at least partially within the bore of the casing.

Described are water-on-water valves for use in reverse osmosis filtration systems. The water-on-water valves are regulated by the pressure in a product line, which contains fluid from a product line of the filter module and/or the product side of a water-on-water storage tank. Exemplary valves are shuttle valves that are regulated by the pressure downstream of the product side of a reverse osmosis filter module. The valves may comprise a piston within a housing, and an end of the piston may have an enlarged diameter relative to the maximum diameter of the remainder of the piston.

A valve device, in particular a double stop-check valve, preferably of the two-way valve type, has at least three fluid connections (1, 2, 3) provided in a valve housing (51). Two valve elements (65, 67) can slide in the valve housing (51). One control device (71) controls the valve elements (65, 67). At least one of the valve elements (65, 67) forms, together with parts (59/61) of the valve housing (51), a seat leak-tight closure part for the associated fluid connections (1, 2, 3).

In one aspect, a valve is provided. The valve includes a body having a first inlet, a second inlet and an outlet. The valve further includes a shuttle disposed in the body. The shuttle is movable within the body between a first position and a second position, wherein the first inlet is open and the second inlet is closed when the shuttle is in the first position, and wherein the first inlet is closed and the second inlet is open when the shuttle is in the second position. In addition, the valve includes a non-metallic seal assembly disposed adjacent each inlet. The seal assembly having a seal member with a V-shaped configuration. In another aspect, a method of moving a shuttle in a valve is provided. The method includes three stages of dampening which slows the velocity of the shuttle as it moves within a body of the valve toward an inlet.

A spool switching valve device may include a columnar spool housing and spherical valve bodies. The spool housing includes first input port cavity portions, valve body movable portions and valve seat members. Each valve seat member has a through hole and includes a second input port portion. A second valve seat portion is provided to open and close the gap between valve body movable portion and the second input port portion. Each valve body movable portion includes an output port penetrating the side surface of the spool housing to communicate with the outside of the spool. Each valve seat mounting portion includes an engagement receiving portion suppressing the detachment of the valve seat members when the valve seat member is actually mounted. Each valve seat member includes an engagement portion fitted into the engagement receiving portion when the valve seat member is mounted to the valve seat mounting portion.

A loop flushing valve assembly for use in a hydraulic circuit has a pair of valve subassemblies cooperating with a respective valve seat between a port and an outlet passage. Each subassembly has a main port plug and a fluid passage plug with a fluid passage extending therethrough. A valve body is engaged to the fluid passage plug and is axially moveable from a closed position where its seat end is in contact with its respective valve seat to prevent fluid flow from the respective fluid side to the outlet passage to an open position and the valve body is biased to the closed position. A poppet extends out the seat end of the each valve body. When pressure in one fluid side exceeds pressure in the other side, the valve subassembly poppet axially moves towards the other poppet to open the other side.

A gas-supply system includes a gas container filled with gas, a gas flow controller coupled to the gas container, and an operation device electrically connected to the gas flow controller. The gas-supply system further includes a buffer tank coupled to the gas flow controller and configured to receive the gas from the gas container via the gas flow controller. Furthermore, a pressure transducer disposed on the buffer tank and configured to generate a pressure signal to the operation device according to the pressure of the gas in the buffer tank. The operation device is configured to generate a control signal to the gas flow controller according the pressure signal, and the gas flow controller is configured to adjust the flow rate of the gas according to the control signal to keep the pressure of the gas in the buffer tank in a predetermined pressure range.

A gas-fueled heater can have a housing with pressure regulators, a control valve, a fluid selection valve and a burner positioned therein. The pressure regulators, control valve, fluid selection valve and burner can be configured to combust a fuel to create heat. The housing can include a number of holes passing therethrough to control access to the various components.