We manufacture more than a thousand specifications of over ten series of products, including safety valves, power station valves, steam extraction check valves, gate valves, globe valves, check valves, hard-sealed ball valves, all-welded ball valves, ball valves, butterfly valves, and other models and specifications.
Air release check valve
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Applications
The non-return valve is installed on the high-pressure feed water pump outlet pipe of the thermal power unit to prevent the backflow of feed water and protect the feed water system. This valve works with the minimum flow automatic recirculation bypass valve of the water pump. When the feed water pump is under low load or the outlet shut-off valve is closed, the automatic recirculation bypass valve should be in the open position to ensure the safe operation of the water pump. When the non-return valve is opened, the recirculation bypass valve automatically closes. It is not suitable for media containing solid particles and high viscosity.
Principle
Open the outlet gap. Start the feed water pump. After the feed water reaches a certain pressure, the valve disc rises to a certain height under the action of the feed water pressure, pushing away from the valve seat, and the feed water flows out. At the same time, due to the rising of the valve disc, the connecting rod rotates, actuating the drain port valve plate, so that the blade-type valve of the recirculation moves downward to close the drain port. When the feed water flow decreases, the valve disc falls, pushing the connecting rod to open the drain valve plate, opening the recirculation port to maintain the minimum allowable flow of the water pump. When the pump stops, the valve disc automatically falls, closing the valve port passage to prevent high-pressure water hammer from damaging the feed water system.
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At present, it can produce more than a dozen series of more than 1,000 specifications of safety valves, power station valves, extraction check valves, gate valves, ball valves, check valves, butterfly valves, drain valves, balance valves, and regulating valves of different types and specifications.
The A42Y-P/R type is suitable for equipment or pipelines with corrosive gaseous media where the operating temperature is ≤200℃, serving as a pressure relief device.
Connecting flanges conform to JB/T 79 standard.
Connecting flanges are in accordance with JB/T79 standard.