Zero-leakage rectangular check valve

Abstract

The invention provides a zero-leakage rectangular check valve. The zero-leakage rectangular check valve comprises a valve plate opening and closing system, a closing assisting system and an automatic clearance compensation system. Wherein a lower valve plate of the valve plate opening and closing system is fixedly connected with a second fixing block of the closing assisting system, and a valve seat of the automatic clearance compensation system is fixed to a valve body of the valve plate opening and closing system. The problem that in the prior art, the leakage magnitude of a check valve is high is solved, and zero leakage of the check valve can be achieved.

Description

technical field [0001] The invention belongs to the technical field of valves and relates to a zero-leakage rectangular check valve. Background technique [0002] The nuclear power plant check valve is used in the ventilation system of the nuclear power plant. It plays the role of blocking the unexpected reverse air flow in the ventilation system. It is installed at the outlet of the fan. When the fan is running, the positive pressure formed in front of the valve will open the valve plate; when When the fan stops, due to the loss of positive pressure and under the action of the weight or the weight of the valve plate, the valve will automatically close to prevent the system from backfilling; with the continuous improvement of the design requirements of the ventilation system, the requirements for the internal leakage of the check valve are continuously refined , adding a rectangular check valve with zero-level leakage; there is no domestic manufacturer of zero-level leakage ...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve the above purpose, the present invention provides a zero-leakage rectangular check valve, which solves the problem of high leakage level of the check valve in the prior art

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