High-pressure wear-resistant gate valve

Abstract

The invention relates to a high-pressure wear-resistant gate valve, which belongs to the technical field of valves, and comprises a valve body and a valve cover, a pneumatic film execution assembly is connected above the valve cover, two valve seats are arranged in a valve seat cavity of the valve body, a gate plate assembly is arranged between the two valve seats, and the gate plate assembly comprises a main plate, an auxiliary plate and a wedge-shaped block; a guide rail is arranged on the inclined face of the wedge-shaped block, the auxiliary plate sliding groove is used for containing the wedge-shaped block, the auxiliary plate is provided with a first connecting block and a second connecting block, and a main plate connecting groove is formed in the upper portion of the inclined face of the main plate and used for containing the first connecting block. The pneumatic film executing mechanism drives the transmission rod to achieve linear motion so as to drive the main plate and the auxiliary plate to horizontally press the valve seat, and sealing of the gate plate assembly and the valve seat is achieved. The high-pressure wear-resistant gate valve is provided with the gate plate assembly capable of being rapidly opened and closed, and is suitable for occasions with high pressure, frequent opening and closing, sealing, zero leakage, oil return prevention and medium backflow prevention.

Description

technical field [0001] The patent of the present invention relates to the technical field of valves, in particular to a high-pressure wear-resistant gate valve. Background technique [0002] Slab gate valve is a kind of valve whose closing parts are parallel gates. It is widely used in petroleum and natural gas transmission pipelines, urban water projects and other occasions. The slab gate valve is a multi-rotation valve, which requires a driving device to rotate the valve stem more than dozens of times, and moves up and down under the engagement of the valve stem nut and the valve stem, driving the gate to move to open and close, and the switching time is long. The shortcoming is that the torque is large, and the seal is easy to wear and cause the sealing function to fail. In order to realize the zero leakage of the gate valve seal, the existing flat gate valve mainly adopts the open parallel double gate structure to solve the problem of seal leakage, but there are still s...

AI Technical Summary

Problems solved by technology

The slab gate valve is a multi-rotation valve, which requires a driving device to rotate the valve stem more than dozens of times, and moves up and down under the engagement of the valve stem nut and the valve stem, driving the gate to move to open and close, and the switching time is long. The shortcoming of the large torque, the seal is easy to wear and cause the sealing function to fail

In order to realize the zero leakage of the gate valve seal, the existing flat gate valve mainly adopts the open parallel double gate structure to solve the problem of seal leakage, but there are still some difficulties such as long switching time, difficult manufacturing and high processing precision. It is used in pipelines. If the on-off time is long, there will be a problem of oil leakage and backflow to the tank area

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