Pneumatic expansion sealed knife gate valve

Abstract

The invention discloses a pneumatic expansion sealed knife gate valve. The pneumatic expansion sealed knife gate valve comprises a valve body. Guiding grooves allowing a gate plate to slide in a sealed mode are formed in the two sides of the interior of a medium channel of the valve body in the direction perpendicular to the flow direction of a medium. Wedge-shaped valve seats matched with the bottom face of the gate plate in a sealed mode are arranged on the bottom faces of the medium channel in the direction perpendicular to the flow direction of the medium. The top of the gate plate is connected with a power output end of a pneumatic linear execution mechanism installed on a support. Anti-abrasion rubber pneumatic bags which are in soft sealing with the side face of the gate plate are inserted in the wedge-shaped valve seats. Air charging inlets of the anti-abrasion rubber pneumatic bags are connected with an air charging device. No friction exists between the anti-abrasion rubber pneumatic bags and the gate plate in the opening and closing process of the valve; the anti-abrasion rubber pneumatic bags are air filled and expanded to conduct sealing when the valve is fully closed, and bubble tight sealing can be achieved. Besides, friction exists between the sealing face of the gate plate and the wedge-shaped valve seats at the moment that the valve is closed, and adhered substances on the sealing face can be scraped off, so that sundries are automatically cleaned. Moreover, the pneumatic expansion sealed knife gate valve can further be controlled through pneumatic logic, so that the purpose of automatic control is achieved, and the pneumatic expansion sealed knife gate valve also suitable for short-range control and long-range control.

Description

technical field [0001] The invention relates to the field of knife gate valves, in particular to a pneumatic expansion and sealing knife gate valve. Background technique [0002] Knife gate valve is also called knife gate valve and gate valve. Its opening and closing part is a gate with a blade. The direction of movement of the gate is perpendicular to the direction of the fluid. It is in a floating state in the guide block, and the lug at the bottom is pressed tightly on the valve seat when it is raised and lowered. The ground plane of the gate plate can form a seal with the ground metal valve seat, and can be cut with the blade of the gate plate. Fibers, particles, etc. in the medium. If a higher medium tightness is required, an O-shaped sealing valve seat can be selected to achieve two-way sealing. It is often used in pneumatic conveying systems such as dust removal, ash conveying, coal powder, mineral powder, slag, etc., but due to the wear of the valve by solid medium...

AI Technical Summary

Problems solved by technology

It is often used in pneumatic conveying systems such as dust removal, ash transportation, coal powder, mineral powder, slag, etc., but due to the wear of the valve by solid medium particles, the valve air seal is not good, resulting in a decrease in the efficiency of the pneumatic conveying system

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