A valve for controlling a gas stream between a first side and a second side of the valve is described. A valve opening is passage for the gas stream between the first side and the second side. A valve closure with a valve plate closes the valve opening. A valve mount is arranged toward the second side and on which the valve closure is mounted. The valve closure is pretensioned in the direction of the first side to close the valve toward the second side by the valve plate. The valve plate has an opening element which can be opened toward the first side in the event of an overpressure on the second side.

Disclosed is a check valve and a modulator block including the same. An embodiment of the present disclosure provides a check valve comprising a valve housing including first and second internal flow passages each formed to pass through an interior of the valve housing and having an inlet through which a fluid is introduced and an outlet through which the fluid is discharged; a first opening and closing member provided in the first internal flow passage and opened and closed by a hydraulic pressure of the fluid; a second opening and closing member provided in the second internal flow passage and opened and closed by the hydraulic pressure of the fluid; and a stopper member press-fitted to the valve housing.

A check valve mounting structure includes a seat plate including a mounting hole and linked notches, a tubular bottom fitting with the top end thereof aimed at the mounting hole and having lugs extended from the periphery, and a holder block including a top receptacle, a shoulder and a bottom receptacle, which includes protruding portions outwardly extended from the periphery, first channels upwardly extended from the bottom side to a predetermined distance and second channels respectively and horizontally extended from the top ends of the first channels toward the periphery thereof. The bottom receptacle is attached onto the tubular bottom fitting, allowing the protruding portions to pass through the notches. The lugs are respectively inserted into the first channels and the second channels.

A pressure relief valve includes a valve body, a valve seat, a bonnet, and a valve actuator. The valve body has an open top, a bottom, a back and a front with a cavity formed within. A cap with a first vent is removably attached to the open top. An inlet opening and a discharge opening are in fluid communication with the cavity is formed at the bottom and front of the valve body respectively. The valve seat is circumferentially disposed around the inlet opening within the cavity. A recessed area is formed on a surface on the distal end of the valve seat that is configured to receive a lip seal. The bonnet has a closed top end with a second vent. The valve actuator is coupled within the bonnet to a set-pressure enabling means that is not a mechanical spring.

A water flow valve positioned within a waterline preferably just past a building's water meter. The valve compresses air bubbles into the water at the point where the water enters the meter, thus improving the accuracy of the meter reading. The internal passageway of the valve is non-linear and causing the water traveling therethrough to go through a plurality of turns. A blocking disk and spring are used to close off communication between a first portion of the internal passageway and a second portion of the passageway in a valve closed position. With enough water flow pressure the spring is compressed which causes the blocking disk to retract and allow water to travel through the passageway, while creating the backpressure in the waterline to collapse the air bubbles prior to the bubbles being read by the water meter. A laminar flow for the water can also be created which can reduce the wear and tear on the water meter possibly extending the useful life for the water meter.

A valve assembly with a spring retention assembly including an elongated cylinder portion having an open threaded end and a closed end and an elongated piston portion having a free end and a threaded tab end configured to thread through the open threaded end and, thereby, be slideably captured in the cylinder portion. A spring couples to the body portion and the piston portion to provide a force to urge the body portion and the piston away from one another, wherein the closed end and the free end are similarly shaped so that the spring retention assembly can be reversibly mounted to a valve member that can also be reversibly mounted.

A multi-chamber blowoff valve is provided for releasing excess air pressure from a duct system associated with a vehicle. The blowoff valve has a valve housing, an engine-air interface, and a multiple piston assembly. The valve housing is configured to secure to the duct system at a duct-air interface. The engine-air interface is configured to allow air in and out of the valve housing. The multiple piston assembly is disposed within the valve housing and includes an upper piston and a lower piston that move in unison. The multiple piston assembly is configured to be in a closed position while a pressure differential is above a certain threshold and to be in an open position while the pressure differential is below said certain threshold. While in the open position, a portion of the air in the duct system is released.

Embodiments of the present invention generally include a pressure relief system and methods of use, in which an apparatus includes an upper chamber fluidly connected to a pressurized fluid source, a lower chamber having an inlet and an outlet, a vertically moveable plate intermediate the chambers and disposed within a plate support, and connected to the plate by a vertical shaft, a vertically actuating lower chamber inlet valve including an inlet seal. Pressure relief is accomplished by controlling fluid pressure in the upper chamber such that varying downward force on the plate and therefore, via the shaft, the inlet seal, allows for selective opening/closing of the inlet valve as a function of upper chamber fluid pressure relative to the pressure exerted from a fluid source for which pressure relief is desired, beneath the inlet seal, whereby over-pressured fluid entering the lower chamber via the inlet is vented out the outlet.

An example shuttle valve includes: (i) a valve body comprising a longitudinal cylindrical bore, a first inlet port, a second inlet port, an outlet port, and a key that protrudes radially inward within the longitudinal cylindrical bore; and (ii) a shuttle mounted in the longitudinal cylindrical bore and configured to move axially therein, wherein the shuttle comprises a plurality of radial protrusions that protrude radially outward from, and are circumferentially spaced apart about, a peripheral surface of the shuttle, and wherein the key of the valve body is interposed between two radial protrusions of the plurality of radial protrusions.

Various valves capable of preventing distortion are disclosed. The valve comprises a metal member configured to have at least two sub metal members and a main body. Here, the sub metal members are included in the main body, and the main body is formed of plastic.