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relief valve

A relief valve and fluid technology, applied in the direction of control valves, safety valves, balance valves, etc., can solve problems such as jamming, relief valve failure, assembly costs, etc., to improve response characteristics, reduce friction surfaces, and increase service life Effect

Active Publication Date: 2017-05-17
ZF CV SYST EURO BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A further disadvantage is that the sealing body is inclined inside the hollow cylindrical valve housing and can thereby, in the worst case, become stuck in the cylinder, which can lead to failure of the overflow valve
In addition, since there is no radial sealing of the sealing body relative to the cylinder wall, a small amount of leakage will occur if the axial sealing is not tight
[0003] In addition, overflow valves are known in which the axial and radial sealing of the valve piston relative to the cylinder is effected by means of two separate and specially shaped seals, whereby the number of parts, assembly complexity , construction dimensions and consequently the overall weight of such a pressure limiting valve is relatively large

Method used

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Embodiment Construction

[0021] The overflow valve 10 for a not shown, preferably gaseous fluid, like for example air, also comprises a housing 12 with a hole in the form of a stepped hole introduced into the housing 12 symmetrically to the longitudinal center axis 14. Pot-shaped recess 16 . A cylinder insert 18 and a pressure limiter 20 are arranged axially one behind the other within this recess 16 . The cylinder insert 18 rests here radially outward on the step of the radially inwardly protruding pot-shaped recess 16 of the housing 12 and with its abutment section 22 adjacent to the pressure limiter rests on the pressure limiter 20 on the end away from the bottom. Between the cylinder insert 18 and the recess 16 of the housing 12 an O-ring 24, 24', 24" for sealing is arranged as an example.

[0022] A longitudinally symmetrical and substantially cylindrical piston 26 is accommodated in the cylinder insert 18 coaxially to the longitudinal center axis 14 in an axially displaceable manner....

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Abstract

The invention relates to an overflow valve (10) for a gaseous fluid, having a piston (26) which is prestressed by means of a compression spring (28) and is received in a cylinder (16, 18) of the overflow valve (10) such that it can be displaced along a longitudinal centre axis (14). Moreover, it is provided in said overflow valve that a sealing ring (42) for radial and axial sealing is arranged on a piston underside (40), that the radial outer side (48) of the sealing ring (42) bears against the cylinder (16, 18) on the inner side with the formation of a radial press fit, that the sealing ring (42) bears against a hollow-cylindrical valve seat (44) in a closed state of the overflow valve (10) as a consequence of the prestress of the compression spring (28), and that the sealing ring (42) is raised up from the valve seat (44) with the formation of an annular gap (82) in an open state of the overflow valve (10) after a predefined limit pressure of the fluid is exceeded, in order to release a flow path (84) for the fluid.

Description

technical field [0001] The invention relates to an overflow valve for gaseous fluids, for example in a compressed air-operated brake system of a motor vehicle, with a piston preloaded by means of a compression spring, which can be moved longitudinally The way the central axis moves is housed in the cylinder insert. Background technique [0002] Overflow valves are widely used in the field of compressed air technology, for example in order to maintain the pressure in the rest of the compressed air system during a pressure drop in the pipeline. For example, DE 10 2010 047 401 A1 discloses a valve in the form of a pressure limiting valve with an inlet and an outlet for a fluid. As soon as the necessary opening pressure of the valve is reached, under the influence of the fluid pressure, the piston-shaped sealing body is moved into the open position against the restoring force of the spring element in order to achieve as far as possible unhindered flow of fluid through the openi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K15/02F16K15/06F16K17/04
CPCF16K15/025F16K15/063F16K17/04F16K15/02F16K15/06
Inventor 海因里希·迪卡梅伊尔豪克·克劳斯
Owner ZF CV SYST EURO BV