Large-flow type pneumatic shut-off directional valve

Abstract

A large-flow type pneumatic shut-off directional valve comprises a valve seat, an upper valve body and a lower valve body. A feed inlet for allowing a liquid media to flow in is formed in one side of the upper valve body, and a discharge outlet for allowing the liquid media to flow out is formed in one side of the lower valve body. The valve seat, the upper valve body and the lower valve body are connected in sequence and communicate with one another. A valve rod penetrating through the upper valve body and extending into the lower valve body is arranged in the valve seat. The end, located in the lower valve body, of the valve rod is provided with a lower-end valve clack for sealing the discharge outlet. The end, facing the valve seat, of the lower-end valve clack is the obverse side, and the section, away from the valve seat, of the lower-end valve clack is the reverse side. The other end of the valve rod extends out of the valve seat and is provided with a pneumatic assembly for driving the valve rod to move. The lower-end valve clack is provided with a first filtering hole enabling the obverse side and the reverse side to communicate, and further provided with a filtering hole sealing device for controlling the first filtering hole to be through. The filtering hole sealing device comprises a rotary lower-end valve clack corresponding to the first filtering hole in position, and a locking mechanism for controlling the rotary lower-end valve clack to rotate.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a pneumatic cut-off reversing valve. Background technique [0002] Traditional pneumatic cut-off reversing valves such as patent number: 201320654988.4 Invention name Manual pneumatic cut-off reversing valve The existing cut-off valves mentioned include valve seats and valve bodies at all levels. The valve body is provided with a material inlet and a material outlet. The valve stem in the valve seat passes through each valve body, and the valve stem is provided with a valve disc that matches the inlet and outlet ends of the valve body, relying on the movement of the valve stem to drive the lower valve disc to block or open the port of the valve body, so as to move the The material port is connected with different material outlets to achieve the purpose of reversing. When the valve is opened or closed, the existing pneumatic cut-off reversing valve drives the lower disc by driving ...

AI Technical Summary

Problems solved by technology

However, as a vulnerable part, the spring is often damaged during long-term and high-load use, and its service life is much shorter than the service life of the valve, which will not only cause waste of materials, but also increase maintenance costs.

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