SU1247603A1 - Valve sealing unit - Google Patents

Description

The invention relates to sealing assemblies of valve devices.

The invention is an improvement in the reliability achieved by eliminating the contact of the elastic sealing element with the flow of the working medium.

FIG. 1 shows a sealing assembly with an annular bore located in the seat; in fig. 2 and 3 - sealing unit with an annular bore, located in the valve body.

The sealing assembly consists of a locking member 1 and a saddle 2. In the bore of the housing 3, the inner 4 and outer 5 sleeves are freely located, between which a sealing elastic ring 6 is placed, supported by the end part on the pressure nut 7. The inner sleeve 4 is tucked to the outer sleeve 5 by a spring 8. The sealing surfaces of the sleeves 4 and 5 are lapped over the sealing surface of the closure member 1. The largest outer diameter D of the Self-thickening sleeve 4 exceeds the smallest inner diameter D of the sleeve 5, thereby creating an overlapping sleeve.

L: 1.1, - P

Seal node works as follows.

In the open position (when the locking organ is raised), the distance 1 from the end of the locking member to the end of the inner sleeve 4 is less than the distance L to the end of the outer sleeve 5. The sleeve 4 is tucked into the sleeve 5 by the spring 8. The elastic sealing ring 6 is separated by sleeves 4 and 5 from the work environment. When closing the valve

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the closure body 1, in contact with the end face of the sleeve 4, partially blocks the flow of working medium along mutually lapped surfaces. Upon further movement of the closure body 1, the sleeve 4 moves, compressing the spring 8, and moves away from the sleeve 5, forming a gap o. The axial movement of the sleeve 4 relative to the sleeve 5 takes place until the end of the closure member 1 interacts with the end of the sleeve 5. The sleeves 4 and 5, interacting with the end of the closure member 1, move simultaneously while crimping the sealing elastic ring 6. The ring 6. is deformed and squeezed out into the gap b between the sleeves 4 and 5 and seals the entire assembly along the end surface of the valve, of the organ until complete sealing.

When the valve is opened, the locking member 1 moves in the opposite direction. At the same time, the sleeves 4 and 5 move with it up to the stop of the sleeve 5 into the collar of the body 3, and the elastic ring 6, being compressed, comes out of the gap between the sleeves. Further, together with the locking member 1, the sleeve 4 moves to the stop in the sleeve. 5. At the same time, the gap 6 between the sleeves 4 and 5 is closed and the elastic ring 6 is again protected from the influence of the working medium. After that, the locking organ 1 moves away from the sleeve 4, opening the passage to the working medium. Thus, the elastic sealing ring 6 of the sealing assembly is protected by the sleeves 4 and 5 from the influence of the working medium both from opening and closing the valve, thereby increasing the service life and reliability of the valve device.

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Fi.2

VNIIPI Order 4105/35 i Circulation 880

fig.Z

Subscription

Random polygons pr-tie, Uzhgorod, st. Project, 4

Claims (1)

SEALING ASSEMBLY OF THE VALVE - ON containing a locking body and a seat in it with the possibility of axial movement by concentric conical bushings with an elastic sealing ring located between them, characterized in that, in order to increase reliability, the inner diameter of the outer sleeve is made smaller than the outer diameter of the inner one, which is pressed by a spring outer conical surface to the inner conical surface of the outer sleeve, while the ends of the inner and outer bushings are located lo, in one of which is made a ring Single bore defined at different levels relative to annular end · bore. SU ... 1247603 (fiut.f