Flat gate valve with seal grease being automatically injected

Abstract

The invention relates to a flat gate valve with seal grease being automatically injected. The valve comprises a valve body, a valve cover, a valve rod, a gate plate, a valve seat, a bracket and a driver, wherein two automatic grease injection mechanisms are fixedly arranged on the two sides of the gate plate above the valve seat in the same axial direction with the gate plate respectively; the automatic grease injection mechanism consists of a grease storage cylinder and a piston which is coaxially, hermetically and slidably arranged in the grease storage cylinder; the lower end of the grease storage cylinder is fixedly connected with a grease injection groove inlet which is formed in the valve seat; a sealing surface of the gate plate at a grease injection groove outlet is provided with a gate plate waist-shaped groove in a matching way; and a valve seat annular groove which is coaxial with the valve seat is formed on the seal matching surface of the valve seat, which is contacted with the valve plate. The flat gate valve is scientific in design, rational in structure and reliable in sealing; lubrication and auxiliary sealing effects are achieved by automatic grease injection; the sealing property is effectively improved; zero leakage is achieved by the valve; the service life of the valve is effectively prolonged; and the flat gate valve is safe and reliable and can be used for high-pressure oil and gas pipeline systems.

Description

technical field [0001] The invention belongs to the category of valves, and relates to a flat gate valve, in particular to a flat gate valve for automatically filling sealing grease. Background technique [0002] As people's awareness of safety and environmental protection continues to increase, the requirements for the discharge of toxic, harmful, flammable and explosive media in petroleum, chemical and other special industries are becoming more and more stringent. The valves in the device play an important role in controlling the leakage and discharge of toxic, harmful, flammable and explosive media in the device, especially for valves used in high-pressure fields, such as high-pressure flat gate valves, high-pressure globe valves and high-pressure wedge gate valves etc. Valves with low leakage and good sealing performance can effectively avoid fires, explosions, poisoning and other accidents that endanger life and property safety due to medium leakage due to poor sealing ...

AI Technical Summary

Problems solved by technology

[0003] At present, the sealing method of the valve seat and the gate plate of the high-pressure slab gate valve with a working environment PN≥25MPa is a full hard seal of surfacing welding carbide, in order to ensure the sealing performance of the valve, avoid leakage, and play a role in the movement of the gate plate. For lubrication, there is a grease injector outside the valve body, and the operator needs to frequently fill the valve body with sealing grease. The operation is time-consuming and laborious. If the sealing grease is not filled in time, it may affect the seal and cause leakage.

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