High-pressure ultra-low-temperature type all-metal hard sealing butterfly valve

Abstract

The invention discloses a high-pressure ultra-low-temperature type all-metal hard sealing butterfly valve. The high-pressure ultra-low-temperature type all-metal hard sealing butterfly valve comprises a valve body, a valve rod, a valve plate and a valve seat, wherein an inner secondary opening is formed at one end of the valve body, the valve seat can be embedded into the inner secondary opening, and the valve seat is embedded into the inner secondary opening in a matched mode, and is fixedly connected with the end face of the inner secondary opening through bolts. Due to the fact that the bolts are adopted by the high-pressure ultra-low-temperature type all-metal hard sealing butterfly valve to fixedly connect the valve seat and the valve body, disassembly and assembly are convenient, when the sealing face of the valve seat goes wrong, the valve seat can be simply replaced, and site operation is simple. Meanwhile, independent low-temperature preprocessing can also be carried out on the valve seat to eliminate stress in the high-pressure low-temperature working condition, the valve seat is fastened through the bolts, the sealing effect between the valve seat and a brake plate can be finely adjusted through cooperation of the bolts, and adjustability of the high-pressure ultra-low-temperature type all-metal hard sealing butterfly valve can be effectively improved. Due to the fact that the design of the inner secondary opening is adopted, influence of the valve seat on an inner flowing channel is avoided, and flow can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of valve applications, in particular to a high-pressure ultra-low temperature all-metal hard-sealed butterfly valve. Background technique [0002] High-pressure and ultra-low temperature all-metal hard-sealed butterfly valves have no theoretical design principles and processing techniques in China, and the products have no assembly techniques. They simply imitate foreign products. The processing and assembly methods are repaired and processed, and the parts cannot be interchangeable; it is difficult to achieve Product standardization, crafting and mass production standard production mode. The pressure seal can only be sealed by increasing the external force extrusion method, that is, increasing the diameter of the valve shaft and using the positive pressure of the pipeline to seal, there is no seal guarantee; zero leakage will occur after repeated use, and the service life of the seal is extremely short; the...

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Problems solved by technology

At present, the products used in domestic LNG are all imported products from abroad, the price of imported products is high, and the maintenance cost is expensive

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