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Seat ring for butterfly valve and its fixing structure, and eccentric butterfly valve

A technology for valve seat rings and butterfly valves, which is applied in the direction of lift valves, valve devices, mechanical equipment, etc., can solve problems such as leakage, and achieve the effects of durability, easy elastic deformation, and good operability

Active Publication Date: 2020-03-03
KITZ CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if there is no leakage on the gasket side at normal temperature, leakage may occur when exposed to low temperature

Method used

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  • Seat ring for butterfly valve and its fixing structure, and eccentric butterfly valve
  • Seat ring for butterfly valve and its fixing structure, and eccentric butterfly valve
  • Seat ring for butterfly valve and its fixing structure, and eccentric butterfly valve

Examples

Experimental program
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Embodiment Construction

[0064] Hereinafter, embodiments and functions of the seat ring for a butterfly valve and the eccentric butterfly valve of the present invention will be described based on the drawings. exist figure 1 , shows a longitudinal sectional view showing an embodiment of an eccentric butterfly valve equipped with a seat ring for a butterfly valve according to the present invention. figure 2 , showing figure 1 Near the lower part of the valve body (disc) of the eccentric butterfly valve. The operating pressure of the butterfly valve of the present invention is assumed to be a pressure of 2 to 5 MPa. In the present embodiment, normal temperature is assumed to be about 20°C, high temperature is assumed to be about 200°C, and low temperature is assumed to be about -30°C.

[0065] figure 1 The eccentric butterfly valve (hereinafter referred to as the valve body 10) has a valve body 11, a valve disc 12, a valve seat retainer 13 and a valve seat ring (hereinafter referred to as the va...

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PUM

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Abstract

A butterfly-valve seat ring and fixing structure of the same, and an eccentric-type butterfly valve in which, the butterfly-valve seat ring has a flexible part (31) with a predetermined material thickness integrally and extendedly provided on one side surface of an inner diameter of a ring-shaped base body part (30) having a substantially rectangular shape in section and has a fixing part (32) integrally and extendedly provided on one side surface of an outer diameter of the base body part, has a recessed-shaped space part (40) provided between an outer circumferential surface (36) of the flexible part and an inner circumferential surface (37) of the fixing part, and has a seal contact part (35) provided to project at an inner diameter position of the flexible part. The seal contact part is positioned on an inner circumferential surface of the flexible part rather than a depth-side position of the space part.

Description

technical field [0001] In particular, the present invention relates to a seat ring for a butterfly valve suitable for high-pressure fluid, its fixing structure, and an eccentric butterfly valve. Background technique [0002] Conventionally, eccentric butterfly valves are generally known as valves suitable for high-pressure fluids. For example, in a double eccentric butterfly valve, the valve shaft is provided eccentrically to the flow path side with respect to the valve body, and an imaginary cone is provided from a predetermined point on the center line of the flow path toward the outer periphery of the valve body. The upper contact surface with the valve body becomes the sealing surface of the fluororesin valve seat ring, and even under high pressure, the sealing performance when the valve is closed is higher than that of the center butterfly valve. Seat rings used in such eccentric butterfly valves are generally formed of fluororesin as a heat-resistant material so as to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K1/226F16K1/42
CPCF16K1/2263F16K1/226F16K1/42
Inventor 宫下幸博佐久一典
Owner KITZ CORP