A ball check valve controls the flow of fluid with a sphere. A body has a fluid path and a recess for receiving the sphere in alignment with the fluid path. The sphere has a retainer which secures a ball check within it. When the valve is in a Run position and the rate of fluid flow increases excessively, the ball check seats in a narrow opening of the sphere, thus restricting the flow of fluid.

A valve (104) includes: a valve body (200) having a valve chamber (204), a seat (226) formed by an interior surface of the valve body, and one or more flow directing features (228, 230) formed about the seat; a float ball (224) disposed within the valve chamber, wherein the one or more flow directing features formed about the seat are configured to allow fluid flow therethrough when the float ball is seated at the seat; and a seal (216) disposed within the valve body, wherein when liquid enters the valve chamber and reaches a particular level within the valve chamber, the float ball is configured to float on the liquid until it reaches the seal, thereby scaling the valve chamber.

A pressure measuring system is provided in which a closing element supported in the pressure fitting channel is activated or displaced by a pressure surge or a pressure wave and thereby seals the channel to the measuring element and thus prevents an outflow of the fluid.

A pressure relief valve includes a valve housing having an inlet end with an inlet opening having a valve seat surface surrounding the inlet opening. The valve housing defines an outlet end with a plurality of outlet holes and a valve chamber disposed between the valve seat and the outlet end. One of the plurality of outlet holes has a smaller cross section than the other outlet holes. The valve chamber includes a plurality of radially protruding grooves extending radially beyond a base diameter. One of the plurality of radially protruding grooves has a groove cross section that is smaller than a groove cross section of the remaining grooves, which along with the smaller outlet hole cause a lateral pressure imbalance on the valve member so that the valve member tends to remain in contact with a side of the valve seat while permitting relief flow.

A pressure relief valve includes a valve housing having an inlet end with an inlet opening having a valve seat surface surrounding the inlet opening. The valve housing defines an outlet end with a plurality of outlet holes and a valve chamber disposed between the valve seat and the outlet end. One of the plurality of outlet holes has a smaller cross section than the other outlet holes. The valve chamber includes a plurality of radially protruding grooves extending radially beyond a base diameter. One of the plurality of radially protruding grooves has a groove cross section that is smaller than a groove cross section of the remaining grooves, which along with the smaller outlet hole cause a lateral pressure imbalance on the valve member so that the valve member tends to remain in contact with a side of the valve seat while permitting relief flow.

A pressure measuring system is provided in which a closing element supported in the pressure fitting channel is activated or displaced by a pressure surge or a pressure wave and thereby seals the channel to the measuring element and thus prevents an outflow of the fluid.

An excess flow valve includes a valve body including an inlet, an outlet, and a pressure relief portion. The inlet includes an outlet port. A pressure relief valve is positioned in the pressure relief portion. A resetting device is installed within the pressure relief valve, and includes a push rod. An excess flow device is installed within the inlet and includes a flow-stopping component which blocks the outlet port when subjected to fluid pressure exceeding a set limit. When the push rod is moved by a force, one end of the push rod moves toward a position where the flow-stopping component blocks the outlet port. After abnormal exclusion, simply operating the push rod to move the flow-stopping component to release the obstruction. Users can easily release the obstruction of the excess flow device to the fluid by operating the resetting device.

A flow-through pressure-vacuum valve includes a valve body having a tank-side opening and a vent-side opening. A pressure relief valve (e.g., a ball held in a corresponding seat by gravity) is positioned within a first passageway through the body. The ball is moved from the first valve seat to open the first passageway when pressure at the tank-side opening exceeds pressure at the vent-side opening by a predetermined pressure differential. A vacuum relief valve is positioned within another passageway (e.g., a serpentine passageway). The vacuum relief valve (e.g., also a ball held in a corresponding seat by gravity) is positioned within the serpentine passageway. Analogously, the ball is moved from the valve seat to open the serpentine passageway when pressure at the tank-side opening is less than the pressure at the vent-side opening by a predetermined pressure differential.

A valve (104) includes: a valve body (200) having a valve chamber (204), a seat (226) formed by an interior surface of the valve body, and one or more flow directing features (228, 230) formed about the seat; a float ball (224) disposed within the valve chamber, wherein the one or more flow directing features formed about the seat are configured to allow fluid flow therethrough when the float ball is seated at the seat; and a seal (216) disposed within the valve body, wherein when liquid enters the valve chamber and reaches a particular level within the valve chamber, the float ball is configured to float on the liquid until it reaches the seal, thereby scaling the valve chamber.

An excess flow valve includes a valve body including an inlet, an outlet, and a pressure relief portion. The inlet includes an outlet port. A pressure relief valve is positioned in the pressure relief portion. A resetting device is installed within the pressure relief valve, and includes a push rod. An excess flow device is installed within the inlet and includes a flow-stopping component which blocks the outlet port when subjected to fluid pressure exceeding a set limit. When the push rod is moved by a force, one end of the push rod moves toward a position where the flow-stopping component blocks the outlet port. After abnormal exclusion, simply operating the push rod to move the flow-stopping component to release the obstruction. Users can easily release the obstruction of the excess flow device to the fluid by operating the resetting device.