A small diameter triple eccentric butterfly valve and its application

Abstract

The invention discloses a small-bore three-eccentric center butterfly valve and the purpose thereof. The small-bore three-eccentric center butterfly valve comprises a valve body, a valve plate is arranged on the valve body, the valve plate is connected with a valve rod, and a sealing ring is arranged on the contact face of the valve body and the valve plate. A pressing plate is fixedly arranged on the valve body, a groove is formed between the valve body and the pressing plate, and the side, close to the valve body, of the sealing ring is arranged in the groove. A reinforcing composite graphite gasket is arranged between the sealing ring and the pressing plate, and a reinforcing composite graphite gasket is arranged between the sealing ring and the valve body. The structure of the small-bore three-eccentric center butterfly valve ensures that the sealing ring can not shake randomly in the groove and also can expand freely when working in a high-temperature working condition, so that it is guaranteed that the sealing ring and the sealing face of the valve plate are consistent in expansion under the thermal state working condition, and good sealing performance of the valve under the high-temperature working condition is guaranteed.

Description

technical field [0001] The invention relates to a valve, in particular to a small-diameter triple-eccentric butterfly valve and its application. Background technique [0002] In some key positions of the pipeline in the refining and chemical industry, there are strict requirements on the valve's adjustment performance, fast closing time and leakage level when closing. The characteristics of zero leakage have been widely used. [0003] When the triple eccentric butterfly valve works at a temperature exceeding 450°C, due to thermal deformation and inconsistent expansion of the sealing ring and the valve plate, the sealing performance is reduced or completely invalidated under high temperature conditions, which reduces the working efficiency of the entire device It may even pose a safety hazard. Therefore, solving the problem of synchronous expansion of the valve plate and sealing ring of the triple eccentric butterfly valve under high temperature conditions has become the ke...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: for the small-bore triple-eccentric butterfly valve (DN≤600), due to the limitation of its caliber and opening size, the double-cylinder structure cannot be obtained. Sufficient design space, so the above method cannot be used to achieve good sealing performance of small-diameter triple-eccentric butterfly valves under high temperature conditions

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