Valve seat for spherical valve and ball valve using same
A valve seat and ball valve technology, applied in valve details, valve device, valve shell structure, etc., can solve the problems of short service life of rigid-sealed valve seat ball valve, poor automatic adjustment ability of preload specific pressure, etc., to improve internal leakage The effect of sealing, long service life and stable internal leakage sealing
Active Publication Date: 2012-07-18
DANFOSS (TIANJIN) CO LTD
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Problems solved by technology
At the same time, in use, after the sealing seat is worn, the automatic adjustment ability of the preload specific pressure is very poor or almost non-existent, so the service life of the rigid sealing seat ball valve is relatively short
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[0056] The present invention will be described in detail below in conjunction with various preferred embodiments with reference to the accompanying drawings. Here, it should be pointed out that the embodiments of the present invention are only exemplary, which are only used to explain the principles of the present invention rather than limit the present invention.
[0057] In the following description, the same or similar structural components will be given the same reference numerals throughout the drawings.
[0058] For the ball valve, the ball 5 as the opening and closing part has been structurally finalized and there is almost no room for improvement. Therefore, the structure and material of the valve seat play a vital role in the internal leakage sealing effect of the ball valve. Therefore, the present invention aims to provide an improved valve seat structure and cooperate with the selection of valve seat material to realize a valve seat with excellent internal leakage ...
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The invention discloses a valve seat for a spherical valve. The valve seat is annular and comprises a first axial annular end face, a second axial annular end face, a radial inner surface and a radial outer surface. The radial inner surface comprises a contact surface which comes into contact with a ball serving as a starting and closing member; and the valve seat has at least one of the following structural characteristics that: a, the first axial annular end face is provided with an annular bump which is convexly positioned between the radial inner and outer ends of the first axial annular end face; and b, the radial outer surface is provided with an annular groove extending inwardly along the radial direction of the radial outer surface; the annular groove comprises a first wall on oneside of the first axial annular end face and a second wall on one side of the second axial annular end face; an annular skirt part is formed between the contact surface of the radial inner surface incontact with the ball and the second wall of the annular groove and provided with a run-through passage; and the fluid of the run-through passage connects the spaces on the two sides of the annular skirt part in the axial direction.
Description
technical field [0001] The invention relates to a valve seat for a ball valve and a ball valve using the valve seat. Background technique [0002] Ball valves are widely used in various fluid transfer systems such as refrigeration systems. In addition to other indicators, the anti-end leakage performance of the ball valve is an important indicator to evaluate its quality. Although the fluid leaked from the ball valve does not flow to the outside, its harm cannot be ignored. If internal leakage occurs in the ball valve, it will affect the quality of the product at least, and cause serious accidents due to leakage. [0003] figure 1 is a perspective view illustrating the general structure of a ball valve by taking a ball valve used in a refrigeration system as an example. like figure 1 As shown, the ball valve 100 includes a valve body 2, a tail body 1 connected to one end of the valve body, a ball 5 set in the valve cavity as an opening and closing member, a valve stem 3...
Claims
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IPC IPC(8): F16K27/06F16K5/06
Inventor 王欣赵斌黄丙元贺嘉
Owner DANFOSS (TIANJIN) CO LTD