Valve seat and valve body all-metal sealing structure
A sealed structure, all-metal technology, used in valve devices, cocks including cut-off devices, engine components, etc., can solve problems such as difficulty, valve leakage, loose valve body and valve seat or large gaps, and achieve simple structure and cost. low effect
Inactive Publication Date: 2012-11-21
上海开维喜集团股份有限公司
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- Abstract
- Description
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- Application Information
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Problems solved by technology
One is that the seal between the valve seat and the valve body is achieved by axially compressing graphite to achieve radial sealing. The seat hole of the valve body and the matching outer circle of the valve seat require a high degree of smoothness, but the seat hole of the valve body must reach a very high level. High finish is more difficult
The second is that the seal between the valve seat and the valve body is a dynamic seal. In the case of strong erosion of the medium or high temperature thermal expansion, the valve body and the valve seat are often loosened or the gap is too large, which eventually leads to valve leakage.
Method used
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Embodiment Construction
[0017] Please refer to the accompanying drawings for a further description of the present invention.
[0018] Such as figure 1 As shown, the present invention provides a low-pressure valve seat and valve body all-metal sealing structure, and the low-pressure valve seat 2 is fixed on the bottom plane of the valve seat hole of the valve body 1 through a retaining ring 4 to realize contact sealing. The valve body 1 is provided with a grinding wheel overtravel groove on the bottom plane of the low-pressure valve seat 2 hole, which is convenient for high-precision grinding of the bottom plane. The bottom plane of the low-pressure valve seat 1 and the bottom plane of the valve seat hole of the valve body 1 are matched and ground after precision machining to ensure 100% contact. The low-pressure valve seat 2 is fixed on the bottom plane of the valve seat hole of the valve body through a retaining ring 4 to realize contact sealing. Under the action of the medium, the ball 3 is pushe...
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The invention discloses a valve seat and valve body all-metal sealing structure. A valve seat is fixed to a bottom plane of a valve seat hole of a valve body by a retainer ring to be in contact seal with the bottom plane of the valve seat hole of the valve body, or the valve seat is fixed to the bottom plane of the valve seat hole of the valve body by a pressure plate and a screw to be in contact seal with the bottom plane of the valve seat hole of the valve body. The valve seat and valve body all-metal sealing structure has the advantage that 'zero' leakage can be guaranteed under the condition of powerful erosion of media or high-temperature thermal expansion.
Description
technical field [0001] The invention relates to a sealing structure, in particular to an all-metal sealing structure of a valve seat and a valve body. Background technique [0002] The traditional metal hard seal ball valve seat and valve body are mainly sealed by "O" ring or graphite. The use of "O" ring seal is mainly suitable for working conditions with a temperature of 250 °C. Although the use of graphite seal can be applied to working conditions with a temperature above 250°C, there are two problems. One is that the seal between the valve seat and the valve body is achieved by axially compressing graphite to achieve radial sealing. The seat hole of the valve body and the matching outer circle of the valve seat require a high degree of smoothness, but the seat hole of the valve body must reach a very high level. High finish is more difficult. The second is that the seal between the valve seat and the valve body is a dynamic seal. In the case of strong erosion of the m...
Claims
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Inventor 梁连金卓育成
Owner 上海开维喜集团股份有限公司