Pressure-limiting valve

Patent metadata

Field	Value
Publication number	US-10589729-B2
Application number	US-201815971448-A
Country	US
Kind code	B2
Filing date	May 4, 2018
Priority date	Nov 5, 2015
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A pressure-limiting valve has a valve housing, a piston, a pressure-limiting adjustment spring, at least one inlet and at least one outlet. The piston can assume an open position in which the inlet and the outlet are connected to each other and a closed position which separates the inlet and outlet. A first piston ring has a sealing surface and has a small pneumatic active surface relative to a second piston ring. Between the first and second piston rings the piston has a substantially truncated cone-like portion which tapers toward the first piston ring. In the closed position, the sealing surface of the first piston ring is sealingly drawn against a housing collar by a pneumatic force acting counter to the force of the pressure-limiting adjustment spring. A pneumatic passage for creating a safety valve function closable by a spring-loaded safety valve body is provided in the piston.

First claim

What is claimed is:

1. A pressure-limiting valve comprising a valve housing, a valve piston and a pressure-limiting adjusting spring,
wherein at least one valve inlet and at least one valve outlet are provided in the valve housing,
wherein the valve piston can assume an open position, in which the valve inlet and the valve outlet are connected to one another, and at least one closed position, in which the valve inlet and the valve outlet are separated from one another,
wherein the valve piston has a first piston ring with a sealing face and a second piston ring,
the first piston ring has a pneumatic active surface smaller than a pneumatic active surface of the second piston ring,
between the first piston ring and the second piston ring the valve piston has a truncated cone-shaped section which tapers in the direction of the first piston ring,
in the closed position the sealing face of the first piston ring is pulled in a sealing manner against a housing lip by a pneumatic force acting on the first piston ring and second piston ring against a force of the pressure-limiting adjusting spring,
the valve piston includes a pneumatic passage closable by a spring-loaded safety valve body, and
wherein the pressure-limiting adjusting spring is set against the second piston ring on a side of the second piston ring opposite from the first piston ring.

2. The pressure-limiting valve as claimed in claim 1 , wherein
only a portion of a radial face of the first piston ring is guided in the valve housing.

3. The pressure-limiting valve as claimed in claim 2 , wherein
a sealing face of the first piston ring is arranged in the radial face of the first piston ring.

4. The pressure-limiting valve as claimed in claim 3 , wherein
the sealing face of the first piston ring is formed by at least one of an O-ring and a vulcanized-on sealing element.

5. The pressure-limiting valve as claimed in claim 4 , wherein
the second piston ring has a radial face which is guided in the valve housing, and
a sealing ring is provided in the radial face of the second piston ring.

6. The pressure-limiting valve as claimed in claim 5 , wherein
the sealing ring in the radial face of the second piston ring is formed by at least one of an O-ring and a vulcanized-on sealing element.

7. The pressure-limiting valve as claimed in claim 6 , wherein
the safety valve body is spring-loaded by the pressure-limiting adjusting spring.

8. The pressure-limiting valve as claimed in claim 7 , wherein
when in a closed position, the safety valve body bears in a sealing manner against the sealing ring of the second piston ring.

9. The pressure-limiting valve as claimed in claim 8 , wherein
the safety valve body is guided in the valve housing.

10. The pressure-limiting valve as claimed in claim 1 , wherein
the safety valve body is arranged in an interior of the valve piston.

11. The pressure-limiting valve as claimed in claim 10 , wherein
the safety valve body has a safety valve body sealing ring configured to close in a sealing manner the pneumatic passage when the safety valve body is in a closed position.

12. The pressure-limiting valve as claimed in claim 11 , wherein
the safety valve body has a safety valve body spring which biases the safety valve body against the pneumatic passage when the safety valve body is in a closed position.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh
• Knorr Bremse Systeme Fuer Nutzfahzeuge Gmbh

Inventors

• Aydemir Isa

Classifications

• B60T15/50

  with means for limiting or relieving pressure in reservoirs · CPC title

• B60T17/002

  Air treatment devices · CPC title

• B60T11/34 Primary

  Pressure reducing or limiting valves {(for arrangements for adjusting wheel-braking force responsive to vehicle weight or load B60T8/1831)} · CPC title

• B60T17/18

  Safety devices; Monitoring · CPC title

• B60T15/36 Primary

  Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} · CPC title