High-performance slow-shut check valve

Abstract

The invention relates to a high-performance slow-shut check valve which comprises a main valve and a slot-shut mechanism, wherein a swing check valve is adopted as the main valve which is mainly characterized in that one end of a main valve rotating shaft extends out of the valve body and is connected with the slow-shut mechanism; the slow-shut mechanism is of a piston structure and comprises a cylinder body, a cylinder cover, a piston rod, a piston convex disk and a piston concave disk, one end of the piston rod is fixedly connected with the rotating shaft, part of the other end of the piston rod, which is positioned in the cylinder body, is provided with a T-shaped thread, the piston convex disk and the piston concave disk are respectively provided with a positive T-shaped thread and a negative T-shaped thread and meshed with the piston rod, a convex block of the piston convex disk is movably matched with a concave hole of the piston convex disk, and a piston cavity between the piston convex disk and the piston concave disk, a piston cavity between the piston convex disk and the cylinder body, and a piston cavity between the piston convex disk and the cylinder cover are respectively communicated with three port channels of a regulating valve. The high-performance slow-shut check valve has the characteristics of low closing noise, stable slow-shut performance, convenience forinstallation, simple structure and the like, and is suitable for control valves of preventing mediums on outlet pipelines of various pump stations from flowing backwards.

Description

technical field [0001] The invention relates to the field of valves, in particular to a slow-closing check valve. The invention is applicable to the control valve for preventing medium backflow on outlet pipelines of pumps such as water supply and sewage discharge. Background technique [0002] The slow-closing check valve is composed of a main valve and a slow-closing mechanism. The main valve generally adopts a swing check valve, which is installed on the main pipeline. The valve disc is pushed to open by the positive medium, and the valve disc is pushed to close by the reverse medium. During the process, the slow-closing mechanism controls the closing speed of the disc to prevent the closing speed of the disc from being too fast and colliding with the valve seat to damage the sealing surface and cause water hammer. For example, the patent No. ZL201010253388.8 is a hydraulic self-controlled inclined seat micro-resistance slow-closing check valve, which consists of a valve...

AI Technical Summary

Problems solved by technology

The disadvantage is that the buffer device uses the compression spring when the valve plate touches the piston rod to prevent the closing speed of the valve plate. When the valve plate touches the piston rod, it will produce a loud collision sound; During the closing process, the spring fatigue will affect the slow closing performance; the buffer device is installed in the valve body of the main valve, which is troublesome to install and has a complicated structure

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