Four-way mix-proof double-seat valve

Abstract

The four-way anti-mixing double-seat valve includes a cylinder body, an upper piston, a first biasing force component for resetting the upper piston, a valve body located at the lower part of the cylinder body and a shaft core connected to the upper piston, and the other end of the shaft core It extends through the bottom end of the cylinder body to the valve body; it also includes an upper valve core and a lower valve core; a sleeve socketed with the shaft core is arranged on the lower side of the upper piston in the cylinder body, and the outside of the sleeve is in the second power medium There is a lower piston under the inlet and outlet, and a third power medium inlet and outlet is provided on the cylinder below the lower piston. The lower end of the sleeve runs through the bottom of the cylinder and extends to the valve body to connect with the upper valve core; The lower valve core is connected to provide a four-way anti-mixing double-seat valve that can seal the flowing medium in one of the flow passages and at the same time clean the other flow passage and the valve body so as to replace the flowing medium.

Description

Technical field [0001] The invention relates to a valve, in particular to a four-way anti-mixing double-seat valve. Background technique [0002] The anti-mixing valve is a valve used for effective anti-mixing separation of non-mixable flowing media at the intersection of flow channels. The use of the anti-mixing valve can save pipeline costs while ensuring the efficiency of medium transmission. Therefore, the anti-mixing valve is widely used in the dairy industry, beer, food, medical, chemical and other fields. [0003] In the prior art, Chinese Patent CN101377251A discloses a pneumatic two-position four-way fluid control valve, which is composed of a right-angle four-way valve body, a valve sealing component and an opening and closing execution control component. The opening and closing execution control component consists of a joint, Piston, spacer, cylinder with compressed gas inlet and outlet, shaft core, spring, gasket and handle. The cylinder is fixedly connected with the r...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is that after the flow medium is replaced in the anti-mixing valve in the prior art, the valve core with residual flow medium enters the replaced flow medium, which is likely to cause liquid pollution or even a reaction , so as to provide a four-way anti-mixing double-seat valve that can seal the flow medium in one of the flow channels and clean the other flow channel and valve body to replace the flow medium

Images