Middle open type translation double-sealed rectangular gate valve

Abstract

The invention relates to a middle open type translation double-sealed rectangular gate valve. A right valve plate and a left valve plate which are opened or closed through rectangular frames are installed in a rectangular valve body, and the right and left valve plates are driven to move by a driving device installed on the valve body, and limited by shifting forks at the tops and bottoms of the right and left valve plates and limit rollers; and flow channel compensation is performed by virtue of a flow channel compensation device installed on the edge of an inner cavity of the valve body and flow channel compensation pieces connected to the flow compensation device, while a front sealing ring and a rear sealing ring of the inner cavity of the valve body as well as the front and rear sealing rings in the closure position of the right and left valve plates constitute bidirectional sealing. The rectangular gate valve provided by the invention is a valve with large size and zero leakage, the flow channel clearance is smaller than 5 mm, and the valve is applicable for working conditions of high flow rate and strong vibration.

Description

technical field [0001] This invention relates to gate valves. Background technique [0002] In response to the needs of my country's largest caliber continuous supersonic wind tunnel to be built by the China Aerodynamic Research and Development Center, a rectangular gate valve with super large caliber, complete flow channel and two-way sealing has been developed. Rectangular gate valves are installed at the entrance and exit of the wind tunnel test section. The diameter of the inlet valve is about 12 meters X 4.8 meters, and the outlet valve is about 6.8 meters X 6.8 meters. The main function is to cut off the medium before and after the test section when the staff enters the test section to adjust the equipment, so as to ensure the normal pressure of the test section. The medium of the wind tunnel device is gas, and the maximum speed reaches Mach 1.6. During the test, it is necessary to ensure that the flow channel is complete and smooth, and the maximum gap of the flow ch...

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Problems solved by technology

[0004] The gate plate of traditional blind valve can only move radially left and right. The gate plate and the valve seat are actually relatively fixed structures, which can only achieve one-way sealing, and the one-way sealing cannot be guaranteed after such a large diameter. After the gate is closed, it can move forward and backward along the shaft, and move forward or backward according to the direction of sealing, and stick to the valve seat to achieve bidirectional sealing

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