Abstract: A liquid control valve including a body comprising an inlet port, an outlet port, and an interior chamber, the body defining a liquid passageway between the inlet and outlet ports. Also included is a plunger comprising a groove provided on an external wall, the plunger being configured to reciprocate within the interior chamber of the body between a first position where the valve is closed and a second position where the valve is open. Also provided is a sealing arrangement within the groove configured to seal between the plunger and the interior chamber of the body. The sealing arrangement includes a first sealing element on the external wall of the plunger and spaced apart from an inner wall of the internal chamber, and a second sealing element on the inner wall of the internal chamber and spaced apart from the external wall of the plunger.

Abstract: A liquid control valve including a body comprising an inlet port, an outlet port, and an interior chamber, the body defining a liquid passageway between the inlet and outlet ports. Also included is a plunger comprising a groove provided on an external wall, the plunger being configured to reciprocate within the interior chamber of the body between a first position where the valve is closed and a second position where the valve is open. Also provided is a sealing arrangement within the groove configured to seal between the plunger and the interior chamber of the body. The sealing arrangement includes a first sealing element on the external wall of the plunger and spaced apart from an inner wall of the internal chamber, and a second sealing element on the inner wall of the internal chamber and spaced apart from the external wall of the plunger.

Abstract: A float or a near neutral buoyancy weight operated liquid pressure control valve includes a body which together with an end cap form a cavity and retain a diaphragm therein. A back-pressure chamber is formed between the end cap and the diaphragm and the diaphragm includes a seal section which seats on an inlet port. The diaphragm seal also separates the inlet from an outlet formed in the body. A float support arm reciprocally operates a valve opening and closing control pin mounted in an associated bleed passage formed longitudinally through a control pin mounting. In an open mode the bleed passage vents the chamber. In a closed mode the pressure in the chamber displaces the diaphragm to close the valve. A slide is coupled to the diaphragm so as to be displaced therewith and prevent excessive pressure to distort the diaphragm once the seal closes on port.

Abstract: A liquid pressure control valve includes at least one O-ring seal mounted, in a first sealing position, on a sealing section of a first component thereof to seal a junction between that first component and a second component which junction controls a bleed passage between. The first component is threadingly engaged within the second component. The valve includes a chamber intended to contain liquid up to a required pressure during operation of the valve. The valve includes at least one annular impingement element mounted about a reduced diameter section, relative to the sealing section, of the first component and adjacent thereto with the impingement element.

Abstract: A liquid pressure control valve includes at least one O-ring seal mounted, in a first sealing position, on a sealing section of a first component thereof to seal a junction between that first component and a second component which junction controls a bleed passage between. The first component is threadingly engaged within the second component. The valve includes a chamber intended to contain liquid up to a required pressure during operation of the valve. The valve includes at least one annular impingement element mounted about a reduced diameter section, relative to the sealing section, of the first component and adjacent thereto with the impingement element.