Cup-seal non-return valve

Details Cup-seal non-return valve Cup-seal non-return valve

1994-09-20

1996-04-30

Lopez, F. Daniel

Expansible chamber devices

Piston

Side wall portion includes peripheral axially extending...

60591, 13750525, 137508, 277205, 277215, F16J 900

Patent

active

055114644

DESCRIPTION:

BRIEF SUMMARY
The present invention is based on a cup-seal non-return valve according to the preamble of the main claim.
Usually such cup-seal non-return valves abut with their inner wall sealingly in an annular groove of a piston which they seal with their sealing lip in relation to an encompassing bore wall. Once pressure is built up from the open end of the V-profile, the sealing lip presses tighter against the bore wall. In case pressure build-up is effected from the closed end of the V-profile, the sealing lip lifts from the bore wall, bears against the inner wall of the cup-seal non-return valve and establishes a pressure fluid passage in this direction. This represents a low-cost space-saving alternative compared to spherical-seat-type non-return valves. However, especially in designs with a very low opening pressure, it may happen that the sealing lip remains stuck on the inner wall, collapses under the effect of pressure or is deformed permanently in any other way.
Therefore, it is an object of the present invention to provide a cup-seal non-return valve of the above kind which functions in a durable and reliable manner.
This object is achieved by the features of the characterizing portion of the main claim. Further, the radial supporting walls permit the sealing lip to at least partly lift from the bore wall, yet they prevent that it sticks to the inner wall and exert a small but sufficient restoring force on the sealing lip. Collapsing of the sealing lip is successfully prevented as well.
Three supporting walls spread over the periphery prove to be particularly favourable. On the one hand, their distances are large enough to keep the initial pressure of the cup-seal non-return valve low. On the other hand, they are small enough to have a stabilizing effect over the entire periphery.
Especially as regards pressure-reducing valves which e.g. operate as brake force control valves and in which cup-seal non-return valves of the above type are frequently used in order to ensure a quick reduction of the rear-wheel braking pressure when braking is terminated, cup-seal non-return valves according to the present invention contribute to enhancing the durability to a major extent.
An exact explanation of the idea of this invention will follow by way of the description of two illustrations.
In the drawing,
FIG. 1 is a segment of a pressure-reducing valve in which an inventive cup-seal non-return valve is mounted,
FIG. 2 is a top view of a cup-seal non-return valve according to the present invention.
In FIG. 1 the cup-seal non-return valve 1 is fitted into the pressure-reducing valve 2 between the inlet chamber 3 and the outlet chamber 4. It embraces in an annular groove the stepped control piston 5, the open end of the cup-seal non-return valve 1 facing the inlet chamber 3, while the closed end thereof faces the outlet chamber 4.
The control piston 5 is guided in the bore 6, the large effective control piston radius R being disposed between inlet chamber and outlet chamber 3 and 4, respectively, while the small effective control piston radius r projects in a sealed manner through the stationary sleeve 7 into a chamber devoid of pressure fluid.
When the pressure-reducing valve is unpressurized, the control piston 5 is in its initial position in abutment on the front wall 8 confining the bore 6 so that the tappet 9 lifts the valve closure member 10 from the valve seat 11 as is shown in the upper half of the illustration.
When the pressure rises from the inlet chamber 3, the control piston 5 starts to move in opposition to the compression spring 12 in the presence of a change-over pressure which is determined by the difference of the pressurized surfaces, on the one hand, and the spring rate of the compression spring 12, on the other hand. The valve closure member 10 moves to sealingly rest on the valve seat 11, as is shown in the bottom half of the illustration. With the pressure continuing to rise in the inlet chamber 3, the pressure rise in the outlet chamber 4 is reduced proportionally.
When finally pressure is decreased

REFERENCES:
patent: 2360577 (1944-10-01), Parrish
patent: 2465175 (1949-03-01), Schwarz et al.
patent: 2665151 (1954-01-01), Fisler et al.
patent: 3532390 (1970-10-01), Bueler
patent: 3680922 (1972-08-01), Kawai
patent: 4619287 (1986-10-01), Hama et al.

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