Pilot type parallel double-flat-plate high-temperature and high-pressure gate valve

Abstract

The invention is applicable to the technical field, and provides a pilot type parallel double-flat-plate high-temperature and high-pressure gate valve which comprises a valve body, a valve cap is arranged at the top end of the valve body, sealing seats are arranged on the two sides in the valve body respectively, a gate plate is arranged between the two sealing seats, and a first channel is formed in the middle of the gate plate. A pilot valve assembly is arranged on one side of the first channel, a gate plate seat is arranged at the top end of the gate plate, a valve rod is connected to the gate plate seat in a sliding mode, a fixing ring is arranged on the valve rod, a push-pull rod is arranged between the fixing ring and the pilot valve assembly, and the upper portion of the valve rod penetrates through the valve cap. The end, extending to the upper portion of the valve cap, of the valve rod is connected with an actuator. A first sealing ring and a second sealing ring are arranged, so that the sealing effect of the gate valve is greatly improved. A pilot valve is connected to a flashboard, the opening torque is greatly reduced through pressure relief of the pilot valve, configuration of the actuator can be greatly reduced, a bypass valve does not need to be welded, cost is saved, and safety and reliability are achieved.

Description

technical field [0001] The invention belongs to the technical field of gate valves, in particular to a pilot-operated parallel double-plate high-temperature and high-pressure gate valve. Background technique [0002] Parallel double disc slab gate valve is a novel structure slab gate valve product, mainly used for cutting or releasing gas and liquid pipelines. Structural features of the double gate flat gate valve series are as follows: the valve adopts a sealing structure composed of two parallel gate plates and its wedge tightening device to replace the traditional wedge gate valve structure. [0003] When the temperature of the existing parallel double-plate high-temperature and high-pressure gate valve is high, the pressure in the inner cavity expands, especially when the medium is gas, the pressure doubles, resulting in the phenomenon of not being able to open or being stuck. Therefore, the parallel double-plate high-temperature and high-pressure gate valve generally a...

AI Technical Summary

Problems solved by technology

[0003] When the temperature of the existing parallel double-plate high-temperature and high-pressure gate valve is high, the pressure in the inner cavity expands, especially when the medium is gas, the pressure doubles, resulting in the phenomenon of not being able to open or being stuck.

Therefore, parallel double-plate high-temperature and high-pressure gate valves generally adopt drilling holes on the inlet valve plate to make the inner cavity communicate with the inlet pipe, but this will cause the inner cavity of the gate valve to lose pressure and the sealing effect is poor.

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