A double-seal structure of an extra-large diameter full-welded fixed ball valve
A sealing structure and all-welding technology, which is applied to valve devices, cocks including cut-off devices, engine components, etc., can solve the problems of insufficient sealing effect and leakage of fluid medium in ball valves, and achieve simple structure, improved sealing performance, and improved performance effect
Active Publication Date: 2018-03-02
CHANGZHOU UNIV
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Problems solved by technology
Although these improvements can play a role in improving the sealing performance to a certain extent, due to the effect of the fluid medium and the influence of the surrounding environment on the sealing structure, the ball valve is prone to fluid medium leakage. Since there is no medium leakage to protect the sealing structure, it cannot reach the final Super high sealing effect
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[0026] The present invention will be described in detail in conjunction with accompanying drawing now. This figure is a simplified schematic diagram only illustrating the basic structure of the present invention in a schematic manner, so it only shows the components relevant to the present invention.
[0027] Such as figure 1 As shown, the ball valve involved in the present invention adopts a fully welded connection mode, which has the remarkable advantages of no leakage, maintenance-free, buried, good rigidity, light weight and long life. The ball 3 is fixed and rotated by the upper and lower support shafts. The ball valve adopts a symmetrical structure as a whole, and the design of the sealing structure is also a symmetrical structure.
[0028] Such as figure 2 As shown, an extra-large diameter all-welded fixed ball valve double sealing structure of the present invention includes a pipeline 1, a connecting pipe 2, a sphere 3, and a primary sealing structure and a secondar...
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The invention provides a double-sealing structure of an all-welded ultra-large-diameter ball valve of a fixed ball. The double-sealing structure comprises a primary sealing structure and a secondary sealing structure which are arranged on the connection surface of a connection pipe and a ball body, and the primary sealing structure and the secondary sealing structure are sealing structures in series connection from inside to outside sequentially. According to the double-sealing structure of the all-welded ultra-large-diameter ball valve of the fixed ball, the double-sealing structure is adopted, the primary sealing structure is close to the edge of a ball valve flow channel and performs a primary sealing function, the secondary sealing structure serves as a leakage protection sealing structure of the primary sealing structure, and when a fluid medium leaks from the primary sealing structure, the secondary sealing structure can perform fluid medium leakage protection sealing. The primary and secondary sealing structures work together, and accordingly, the sealing performance of the ball valve is remarkably improved.
Description
technical field [0001] The invention relates to the technical field of sealing structure and performance of valves, in particular to a double-sealing structure of an extra-large-diameter full-welded fixed-ball valve, which is applied to an extra-large-diameter full-welded fixed-ball valve to realize bidirectional double-sealing functions. Background technique [0002] The opening and closing part of the ball valve is a sphere, which is used to rotate 90° around the axis of the valve stem to achieve the purpose of opening and closing. The structure of the ball valve is mainly composed of a valve body, a ball, a sealing structure, an opening and closing transmission mechanism and a supporting structure. Due to the outstanding advantages of small fluid resistance, good sealing performance, high reliability, and fast opening and closing speed, the ball valve not only makes it widely used in general industrial pipelines, but also plays an important role in realizing agricultural ...
Claims
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IPC IPC(8): F16K5/06F16K5/20
CPCF16K5/06F16K5/201
Inventor 陆怡陈政云姚润盐
Owner CHANGZHOU UNIV