Multi-operating-condition valve sealing structure

A valve sealing, multi-working condition technology, applied in valve devices, cocks including cut-off devices, engine components, etc., can solve problems such as seal leakage

Pending Publication Date: 2018-01-09
SHANGHAI VALVE FACTORY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-working condition valve sealing structure to solve the problems between the floating valve seat and the valve body, the floating valve seat and the ball or Seal leakage between valve core parts such as gate

Method used

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  • Multi-operating-condition valve sealing structure

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Embodiment Construction

[0017] In order to better understand the technical solution of the present invention, it will be described in detail below through specific embodiments in conjunction with the accompanying drawings:

[0018] see image 3 and Figure 4 , is an embodiment of a multi-working condition valve sealing structure of the present invention applied to a ball valve, including a sealing structure 100 at the front end of a valve core and a spring preload structure 200 .

[0019] The front sealing structure 100 of the valve core is located in the matching gap between the valve seat 600 and the valve body 500, including a diaphragm 110, a graphite sealing ring 120 and a pressing mechanism; the diaphragm 110 includes an outer diaphragm and an inner diaphragm, and the outer ring of the diaphragm is located On the radially outer side of the valve seat 600 , the diaphragm inner ring is clamped in the valve seat 600 , and the valve body 500 side of the diaphragm outer ring and both sides of the d...

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Abstract

The invention discloses a multi-operating-condition valve sealing structure. The multi-operating-condition valve sealing structure comprises a valve element front end sealing structure, a membrane, graphite seal rings and a pressing mechanism. The valve element front end sealing structure is located between valve seats and a valve body. The two sides of the membrane are provided with the graphiteseal rings correspondingly. The pressing mechanism is arranged on the radial outer side of the membrane. The membrane and the graphite seal rings are pressed onto a step structure of the valve body and the valve seats in the radial direction. A spring preload structure is arranged between the valve body and the valve seats. The multi-operating-condition valve sealing structure provided by the invention is applied to a ball valve or gate valve sealing system. The multi-operating-condition valve sealing structure makes a ball valve or a gate valve to realize bidirectional sealing under the condition of coexistence of two symmetric valve seats as the detachable sealing structure between the valve seats and the valve body. Under the combined action of medium force of the valve element front end sealing structure and spring force of the spring preload structure, the multi-operating-condition valve sealing structure applies pressure to the valve seat to achieve the sealing effect.

Description

technical field [0001] The invention relates to a multi-working condition valve sealing structure used in the field of valves. Background technique [0002] Under high and low temperature conditions, the requirements for flow resistance characteristics and sealing performance of valves are particularly high. Therefore, ball valves and gate valves are mostly used in projects. Among them, the ball valve generally adopts a piston-type floating valve seat, which can automatically compensate the gap between material shrinkage or expansion caused by temperature changes under the action of spring load and medium pressure, ensuring the sealing performance between the valve seat and the valve core. However, the seal between the floating valve seat and the valve body has always been the weakness of this type of valve. Leakage often occurs in engineering, which seriously affects the operation of the engineering system. [0003] attached figure 1 It is the sealing structure between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/20
Inventor 刘其斌郑志成刘敏陈成
Owner SHANGHAI VALVE FACTORY
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