Pilot-operated safety valve with split structure of the lower disc of the pilot valve

Abstract

The invention relates to a pilot valve lower valve clack split-structure pilot operated safety valve which comprises a main valve and a pilot valve, wherein the main valve comprises a main valve body, a guide sleeve, a main valve clack, a main valve cap, a main valve spring, a main connecting pipe, a main valve seat, a main valve limit screw and the like; and the pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve cap, a pilot valve guide sleeve, a seal locating ring, an upper valve cap, an adjusting bolt, a valve stem, a guide valve clack, a lower spring seat, an upper spring seat, an upper spring, a locking nut, a locating sleeve, an adjusting casing, a lower valve clack shaft, a lower valve clack disk, a lower spring, a lower seal ring, an upper seal ring, an upper guide post and a lower guide post. The pilot valve lower valve clack adopts the split structure, thereby enhancing the pulse effect and synchronization sensitivity of the pilot valve, and ensuring the various action properties and sealing reliability of the pilot operated safety valve. The pilot valve lower valve clack split-structure pilot operated safety valve is suitable for high-pressure high-discharge-capacity high-discharge-back-pressure working conditions in need of quick pressure relief.

Description

technical field [0001] The invention relates to a valve, in particular to a pilot-operated safety valve with a split structure of the lower disc of the pilot valve. Background technique [0002] Pilot-operated safety valve (also known as pulse safety valve) is composed of a main valve and a pilot valve, the main valve is a real safety valve, and the pilot valve is used to sense the pressure of the pressurized system and make the main valve open and close . The pilot-operated safety valve is designed using the principle of failure to open. [0003] The lower disc of the pilot valve of the existing pilot-operated safety valve is an integral structure. During the working process, the lower disc of the pilot valve slides up and down in the seat of the pilot valve to form a pulse pressure to control the opening, discharge and return of the pilot valve. Seat, which determines the action performance of the main valve. The upper part of the lower disc of the integral pilot valve ...

AI Technical Summary

Problems solved by technology

In the dynamic process of valve opening, discharging and reseating, the shaft of the lower disc is centered and guided in the seat of the pilot valve, and the disc of the lower disc needs to be sealed. The assembly accuracy of related parts and its own precision are very high. The lower disc The shaft part and the lower disc disc must move synchronously; and the shaft part of the lower disc disc is often skewed and jammed when moving, resulting in the sealing of the lower disc disc, making it difficult to form pulse pressure, poor exhaust of the pilot valve, and failure of the main valve Unsmooth, action failure, valve failure, user feedback is relatively large, which seriously affects the social and economic benefits of valve manufacturers

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