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Valves are any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways. Valves are used in a variety of applications including industrial, military, commercial, residential, transportation.The air release valve comprises a valve chamber having an inlet and an outlet. Inside the chamber is a control float which is responsive to changes in liquid level in the chamber. There is also a stack of valve members in the chamber above the control float. The valve members have vent passages through them which increase in size with increasing height in the stack but which are smaller than the outlet. The top valve member in the stack is designed to be lifted up, by differential air pressures acting on it, to seat on the outlet and thereby reduce the effective size of the outlet when a pipeline served by the air release valve is filling with liquid and the liquid displaces air through the valve. One aspect of the air release valve provides an air release valve comprising: valve chamber having an inlet and an outlet, a control float in the chamber which is movable, in use, in response to changes in liquid level in the chamber, and a stack of movable valve members in the chamber above the control float, the movable valve members having vent passages there through which increase in size with increasing height in the stack but which are smaller than the outlet, and the top movable valve member in the stack being adapted to be lifted up, by differential air pressures acting on it, to seat on the outlet and thereby reduce the effective size of the outlet when a pipeline served by the air release valve is filling with liquid and the liquid displaces air through the valve. In one embodiment of the air release valve, the upper end of the vent passage of each movable valve member is surrounded by an annular valve seat adapted to seal against the valve member immediately above it. Preferably, there is a round cylindrical housing defining the valve chamber, the vent passages of the valve members being located on the axis of the housing. Preferably also, the control float has a valve seat on the axis of the housing and against which the bottom valve member in the stack can seat. A second aspect of the air release valve provides a method of venting air from a pipeline during filling thereof with a liquid, the method comprising the steps of providing in the pipeline an air release valve having a valve chamber with an inlet and an outlet through which air can vent from the pipeline, and reducing the effective size of the outlet, thereby to control the rate at which air can escape from the pipeline and the rate at which liquid can fill the pipeline.
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Featured Suppliers of Air Release Valve
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R.k. Control Instruments Pvt. Ltd. |
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Mfrs. Of control valves with pneumatic actuators, positioner,booster, airlock, filter pressure regulator, for critical and non-critical processes, in various industries like chemical, petrochemical, fertiliser, refinery, power, steel, oil |
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Valves |
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Tekno Valves |
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Manufacturer of complete range of medical, industrial, fire fighting & auto cng gas cylinder valves bis certified approved by cce nagpur |
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Valves |
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Durga Engineering Company |
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An iso 9002 company. Mfrs. Of ci/cs/fs, sluice/gate, cheek, globe, butterfly (upto - 2400 mm dia. Max). |
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Valves |
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