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Expansion type metallic seal ball valve

A metal seal and expanded technology, applied in shaft seals, valve details, valve devices, etc., can solve the problems of high sealing specific pressure and difficult to meet the sealing requirements, and achieve small torque, no frictional resistance, and improve the sealing effect Effect

Inactive Publication Date: 2010-03-03
方建生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the high-temperature and high-pressure medium is transported, the ball and the valve seat need to be made of metal materials, and the sealing specific pressure is very high. Depending on the pressure of the medium itself, it is difficult to meet the sealing requirements. Applications in media

Method used

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  • Expansion type metallic seal ball valve
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specific Embodiment

[0009] Specific examples: such as figure 1 As shown, the expanded metal-sealed ball valve still includes an upper valve body 1, a lower valve body 2, a ball 3 disposed in the inner cavity of the lower valve body 2, a valve stem assembly for driving the ball 3, a valve seat 4 and a sealing structure. The sphere 3 is provided with through holes, and the valve seat 4 is attached to both sides of the sphere 3 . The upper valve body 1 is generally cylindrical. The lower valve body 2 is provided with a cavity matching the section of the upper valve body 1. The bottom is provided with a stem hole communicating with the inner cavity of the valve body. The lower end of the upper valve body 1 is placed on the upper valve body. In the body 1 cavity, the axis of the upper valve body 1 is perpendicular to the axis of the through hole of the sphere 3 . The spherical surface of the sphere 3 is provided with a penetrating deformation slit 5 in the same plane as the axis of the through hole, ...

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Abstract

The invention relates to a metallic seal ball valve, in particular to an expansion type metallic seal ball valve which is used in high-temperature high-pressure medium occasions, and comprises an upper valve body, a lower valve body, a ball body arranged in a cavity of the lower valve body, a valve rod assembly used for driving the ball body, a valve seat and a seal structure, wherein the ball body is provided with a perforative through hole; the spherical surface of the ball body is provided with a penetrating deformation lance which is positioned in the same plane as the axis of the throughhole; and the valve body assembly is matched with the ball body in a rotating way and matched with the lance in an opening and closing way when the ball valve is closed. As the deformation lance is arranged on the ball body, when the ball valve is closed, the lance of the ball body is widened by the valve rod assembly, and the ball body is enlarged, thus eliminating the gap between the ball body and the metallic valve seat, realizing the seal, further improving the sealing effect, meeting the requirement of being used at high temperature and under high pressure. In addition, when the valve isopened, the ball body is diminished and separated from the valve seat seal surface; and frictional resistance is not generated when in rotation, therefore, the operation is labor-saving.

Description

technical field [0001] The invention relates to a metal-sealed ball valve, in particular to an expanded metal-sealed ball valve suitable for high-temperature and high-pressure medium occasions. Background technique [0002] Existing ball valves are divided into two main forms. One is a floating ball valve, and the other is a fixed ball valve. The ball of the floating ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement to compress the sealing surface of the outlet end to ensure the sealing of the outlet end. This sealing form is to push all the pressure of the medium to the pressurized valve seat. If the material is not good, it will be difficult to bear. This form is widely used in low-pressure ball valves. For example, a large-diameter ball valve has a large opening torque. In order to save labor, the clamping force has to be adjusted by the thickness of the gasket, which is very troublesome to manufacture. The ball of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/20F16K41/02F16K31/60
Inventor 葛天民
Owner 方建生
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