A hydrant valve with an internal automatic shut-off valve. The internal valve blocks communication between a piston chamber and a hydrant chamber when in a closed position. An upper valve opens the internal valve against its biasing force permitting the flow of fluid between the hydrant chamber and the piston chamber. The internal valve closes in response to a disconnection of the upper valve.

A fluid pressure valve according to an embodiment of the present invention is applicable to a fluid pressure servo mechanism. The fluid pressure valve includes a housing having a housing member, the housing member being formed integrally so as to have a first port, a second port, and a flow path connecting between the first port and the second port.

Systems for chemical injection. An example system includes a pilot valve comprising: a hydraulic piston, a poppet, and a biasing device. The system further comprises a jay-selector comprising: a rotatable jay-piston having jay-slots, and a plurality of ports. The system additionally comprises a plurality of flow restrictors.

Methods can comprise charging a first hydraulic device of a first hydraulic circuit with a first quantity of hydraulic fluid from a hydraulic fluid source. The methods can further comprise pressurizing a control segment and locking the first quantity of hydraulic fluid from exiting the first hydraulic circuit in response to hydraulic pressure within the control segment. The methods can also include unlocking the first quantity of hydraulic fluid to permit exiting of the first quantity of hydraulic fluid from the first hydraulic device in response to dropping the hydraulic pressure within the control segment after a delay. Hydraulic apparatus can comprise a normally open hydraulic pilot operated control valve that can be configured to hydraulically lock a first hydraulic device in response to a hydraulic pressure within a control segment rising to greater than or equal to an actuation pressure.

A dispenser includes a housing, an inverted container disposed in the housing, a outlet nozzle, a pump, a first check valve, and a second check valve. The container holds a fluid. The pump is disposed between the container and the outlet nozzle. The pump includes a pump inlet in fluid communication with the container, a pump outlet in fluid communication with the outlet nozzle, and a pump chamber in fluid communication with the pump inlet and the pump outlet. The pump chamber is movable between an expanded position and a compressed position. The first check valve is disposed between the pump and the outlet nozzle, and the first check valve has a first cracking pressure. The second check valve is disposed between the first check valve and the outlet nozzle, and the second check valve has a second cracking pressure. The second cracking pressure of the second check valve is greater than the first cracking pressure of the first check valve.

A relief valve comprises a suction poppet being configured to allow flow of working fluid from the low-pressure passage to the high-pressure passage in a valve-opened state, a pilot passage being configured such that the high-pressure passage and the back-pressure chamber in the suction poppet are communicated through the pilot passage, and a pilot poppet configured to open/close a passage through which the back-pressure chamber and a drain chamber provided in the guide plug are communicated. The suction poppet has a first seating portion being configured to be seated onto the first seat portion of a main body. The main poppet has a projecting portion projecting towards the high-pressure passage. A length from the first seating portion to the tip-end-side opening portion is set so as to be equal to or longer than an outer diameter D.sub.0 of the projecting portion.

The present invention relates to an axial valve with a modular concept for the regulation of fluid flow and prevention of fluid reverse flow consisting of a single-piece and two-piece outer valve body (1; 99) that can be installed within the pipeline, the outer valve body (1; 99) of which contains a coaxially situated inlet and outlet fluid flow opening; a central valve body (2) which is connected to the outer valve body (1;99) by means of a plurality of ribs (1.1), wherein a channels (7) are situated between the outer valve body (1; 99) and the central valve body (2), and said channels allow for an undisturbed flow of the flow fluid when said axial valve is open; an actuator (4a; 4-b; 4c; 4-SC; 4-SH; 4-SFMO) located axially within the central valve body (2; 100), the actuator of which contains an actuator piston (5-a; 5-b; 5-c; 90; 112; 106-SH) and an actuator piston rod (5.1-a; 5.1-b; 5.1-c; 86.1-a; 106.1-SH) to which a regulating piston (6-a; 80) is connected, and with an axial movement of which the flow of the fluid in a pipeline or a disc (104) for the prevention of fluid reverse flow is controlled. The axial valve further comprises a sealing system of the actuator piston rod (5.1-a; 5.1-b; 5.1-c; 86.1-a; 106-.1-SH) and a sealing control mechanism for the same; and a sensor mechanism for signalling a position of the regulating piston (6-a; 80) and the disc (104) of the check valve. The actuator, according to the present invention, may either be a hydraulic actuator (4a; 4-SH) or a mechanical actuator (4-b) or a pneumo-hydraulic actuator (4-c) or a pneumatic actuator (4-c; 4-SH; 4-SFMO), and the sensor mechanism may be either an internal sensor mechanism housed within any of the said actuators or an external sensor mechanism located outside of any of the said actuators, wherein any of the said actuators and said sensor mechanisms are modular and mutually complementary in such a way that they can be combined. The axial valve is a flow control valve or a check valve.

An electromagnetic valve manifold includes a manifold base including passages, a pilot electromagnetic valve including a valve body mounted on a mounting surface of the manifold base, a gasket arranged between the mounting surface and the valve body, and a check valve. The valve body includes an electromagnetic valve-side pilot fluid discharge passage. The manifold base includes a base-side pilot fluid discharge passage that opens in the mounting surface and communicates with the electromagnetic valve-side pilot fluid discharge passage. The check valve is configured to prevent fluid from flowing from the base-side pilot fluid discharge passage to the electromagnetic valve-side pilot fluid discharge passage. The check valve is integrated with the gasket.

A normally closed subplate mounted valve has a lower valve seat defining a function port, an upper seat, and a sleeve between the upper seat and the lower seat. The sleeve defines a first port. The poppet is movable within the sleeve to selectively seal against the lower seat in a piloted position or to seal against the upper seat in an offset position. The poppet blocks the first port when the poppet is positioned in an offset position. A piston shaft is affixed to the poppet for moving the poppet into the piloted or offset position. A spring biases the poppet in the offset position for preventing fluid flow into the first port. A pilot port supplies pressure for sliding the piston to compress the spring and to move the poppet away from the offset position to the piloted position so that fluid may flow into a supply port and out of the function port. A second port may be provided in the sleeve. The ports may be selectively configured for supply or vent. Components may be joined with retainer springs. The piston shaft and poppet connector may be a key and key slot engagement. The ports may be shaped for progressive exposure by movement of the poppet. The poppet may be designed to enable pressure assist through the first port when moving the poppet to the piloted position. The valve seats may be provided with angled sealing surfaces that are angularly offset from their mating counterparts.

A hydrant valve with an internal automatic shut-off valve. The internal valve blocks communication between a piston chamber and a hydrant chamber when in a closed position. An upper valve opens the internal valve against its biasing force permitting the flow of fluid between the hydrant chamber and the piston chamber. The internal valve closes in response to a disconnection of the upper valve.