Backflow prevention valve

Abstract

The invention provides a backflow prevention valve, and belongs to the technical field of machines. The problem that when an existing brake valve and a check valve are used in a combination manner, the adaption is low is solved. The valve comprises a through valve body, one end of the valve body is a water inlet end, the other end of the valve body is a water outlet end, a valve element assembly capable of controlling the valve to be opened and closed is arranged in the valve body, the water outlet end is connected with a non-return assembly, the non-return assembly comprises a core, a seal pad and a supporting spring, a water outlet joint is in threaded connection to the interior of a port of the water outlet end, the non-return assembly further comprises a seal base located in the wateroutlet end, the seal base is in threaded connection to the part, close to the water inlet end, of the water outlet end, the seal base is annular, the seal pad is arranged at the end, facing the seal base, of the core, and abuts against the end of the seal base, a protruding supporting part is arranged on the inner side wall of the water outlet joint, one end of the supporting spring abuts againstthe end face, back to the seal base, of the core, and the other end of the supporting spring abuts against the supporting part. The valve has the beneficial effects of being high in adaptation, rich in function and the like.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to an anti-backflow valve. Background technique [0002] At present, tap water users in towns and cities usually install water meters on the tap water pipelines in order to measure their water consumption. In order to prevent the loss of water resources caused by tap water leakage, conventional valves such as gate valves and ball valves are usually installed in front of the user's water meters as adjustments. and shut-off device use. In addition, in order to prevent the backflow of the medium from affecting the metering of the user's water meter and causing confusion to the management of water resources, a check valve will be added to be used in combination with the gate valve. backflow effect. [0003] However, gate valves and check valves are independent of each other. When used in combination, one end of the check valve body is directly connected to one end of the gate valve bod...

AI Technical Summary

Problems solved by technology

[0003] However, gate valves and check valves are independent of each other. When used in combination, one end of the check valve body is directly connected to one end of the gate valve body, that is, the entire check valve is used as the gate valve. Connect the joint, although this can make a valve have the functions of cutting off and preventing backflow at the same time, because the anti-backflow function of the existing check valve is realized by the spring, and the spring force in the ordinary check valve is not adjustable. Therefore, users cannot limit the pressure according to the needs of the use environment, resulting in low applicability

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