A New Type Sealing Structure of Outer Cutout of Control Valve

Abstract

The invention relates to a novel sealing structure for an external notch of a control valve. The novel sealing structure comprises an upper sleeve (1), a lower sleeve (4) and a valve core (2), and is characterized in that one side, close to the valve core (2), of the lower end face of the upper sleeve (1) is provided with a first annular boss, the upper end face of the lower sleeve (4) is clamped to the first annular boss, a second annular boss is arranged on the inner wall, beside the upper end face, of the lower sleeve (4), and the second annular boss and the first annular boss make contact with the valve core (2), so that a sealing cavity is formed, an annular metal sealing ring (3) is installed in the sealing cavity, the cross section of the metal sealing ring (3) is in a semi-arc shape, and the opening of the semi-arc is back on to the valve core (2). After the trial use, it is proved that after the sealing structure is adopted for the control valve, the leakage class of the whole control valve can easily meet the requirement of the ANSI B16.104 V class.

Description

technical field [0001] The invention relates to a novel sealing structure for an outer cutout of a control valve. Background technique [0002] like figure 1 As shown, the structure of the traditional sleeve control valve is mainly to control the leakage by controlling the tension of the piston sealing ring, the tight fit of the inner wall of the sleeve and the roughness of the inner wall of the sleeve of the valve core. There will be a certain amount of leakage at the sealing surface of the cylinder and the opening of the piston sealing ring. If the tension of the piston sealing ring is small or the roughness and shape tolerance of the sealing surface of the sleeve and the valve core do not meet the requirements, the leakage will hardly meet ANSIB16 .104 Level IV requirements, level V can not be achieved. and figure 2 The structure shown is a balance sealing ring structure made of Teflon material for sealing between the valve core sleeves. This structure can meet the re...

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Problems solved by technology

[0002] like figure 1 As shown, the structure of the traditional sleeve control valve is mainly to control the leakage by controlling the tension of the piston sealing ring, the tight fit of the inner wall of the sleeve and the roughness of the inner wall of the sleeve of the valve core. There will be a certain amount of leakage at the sealing surface of the cylinder and the opening of the piston sealing ring. If the tension of the piston sealing ring is small or the roughness and shape tolerance of the sealing surface of the sleeve and the valve core do not meet the requirements, the leakage will hardly meet ANSIB16 .104 Level IV requirements, level V can not be achieved

and figure 2 The structure shown is a balance sealing ring structure made of Teflon material for sealing between the valve core sleeves. This structure can meet the requirements of ANSIB16.104V level, but because the temperature of the balance sealing ring material can only reach 260 ° C, when the When the temperature is higher, it cannot meet the requirements of the working conditions

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