EP0317305A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Solenoid valve
Assignee: ZF International UK Ltd
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Filing: 1988-11-17
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Granted: —
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Expires: 2008-11-17
Abstract
Abstract An electrically operated valve has a coil (3) and a movable armature (22). A pressure responsive device (17) is subject to pressure from an inlet (5) and a valve element (9) is operated by the armature (22), when the coil (3) is energised, to close a port (18) in the device (17) and so isolate the inlet (5) from a pressure fluid outlet (19) to a working system, such as a vehicle anti-skid braking system. The device (17) is displaceable under the effect of a pressure differential across it as a result of closing the port, the force derived from the then predominant inlet pressure being transmitted by the valve element (9) to load a spring device (27) connected to the armature. Such spring loading increases the force tending to release the armature and leads to rapid opening of the port (18), when required.
Inventors
- 👤 Anthony William Harrison
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 16:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T15/00; B60T15/02; B60T15/025; B60T15/028; B60T8/50; B60T8/5018; B60T8/5025
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
152 words
An electrically operated valve comprising an armature (22) displaceable by an electrical motive device (3) from a rest position to an operative position, a pressure-responsive device (17) subject, in use, to an inlet pressure via a pressure fluid inlet (5), and a valve element (9) acting, upon displacement of the armature (22) towards its operative position as a result of actuation of said motive device (3), to close a port (18) between the pressure inlet (5) and a pressure outlet (19) to a working system so as to isolate said inlet (5) and outlet (19) from one another, said pressure-responsive device (17) being subjected to a pressure differential as a result of closing the port (18), and being displaceable under the effect of a force derived from the then predominant inlet pressure, causing said force to be transmitted by force transmission means (9) to load the armature (22) towards said rest position.
Claim 2
Dependent Claim
152 words
An electrically operated valve comprising an armature (22) displaceable by an electrical motive device (3) from a rest position to an operative position, a pressure-responsive device (17) subject, in use, to an inlet pressure via a pressure fluid inlet (5), and a valve element (9) acting, upon displacement of the armature (22) towards its operative position as a result of actuation of said motive device (3), to close a port (18) between the pressure inlet (5) and a pressure outlet (19) to a working system so as to isolate said inlet (5) and outlet (19) from one another, said pressure-responsive device (17) being subjected to a pressure differential as a result of closing the port (18), and being displaceable under the effect of a force derived from the then predominant inlet pressure, causing said force to be transmitted by force transmission means (9) to load the armature (22) towards said rest position.
Claim 3
Dependent Claim
17 words
A valve according to Claim 1 wherein the valve element (9) serves as said force transmission means.
Claim 4
Dependent Claim
42 words
A valve according to Claim 1 or Claim 2 wherein said port (18) is formed in said pressure-responsive device and is closed by engagement therein of said valve element (9) which then acts to transmit said force to load the armature (22).
Claim 5
Dependent Claim
40 words
A valve according to any one of the preceding claims wherein said force transmission means applies said force to stress a spring (27) which is arranged so that, when so stressed, it loads the armature (22) towards said rest position.
Claim 6
Dependent Claim
24 words
A valve according to any one of Claims 1 to 3 wherein said force transmission means (9) acts to load the armature (22) directly.
Claim 7
Dependent Claim
45 words
A valve according to any one of the preceding claims wherein the pressure responsive means (27) is of disc-like form and resists significant deflection under the effect of rapid transient pressure differential, but deflects to load the armature (22) when an established pressure differential occurs.
Claim 8
Dependent Claim
58 words
A valve according to Claim 6 wherein the pressure-responsive means (27) deflects against a fixed surface (12) under the action of the inlet pressure when said port (18) is closed, and flow control means (C) acts between said inlet (5) and outlet (19), when said port is reopened, to control the rate of pressure re-application through the outlet.
Claim 9
Dependent Claim
22 words
A valve according to Claim 7 wherein said flow control means (C) is at least one groove in said fixed surface (12).
Claim 10
Dependent Claim
30 words
A valve according to any one of Claims 1 to 5 wherein the pressure-responsive means is a piston (30) movable in a chamber communicating with the fluid pressure inlet (5).
Claim 11
Dependent Claim
83 words
A valve according to Claim 9 wherein the piston (30) contains a valve seat member (37) and a spring (34) arranged so that, when the valve member (9) is engaged with the seat member (37) under the action of said motive device (3) so as to isolate said inlet (5) and outlet (19) from one another, movement of the piston (30) under the effect of the then predominant inlet pressure stresses the spring (34) to load the armature (22) towards its rest position.
Claim 12
Dependent Claim
48 words
A valve according to any one of the preceding claims wherein the pressure responsive device (17) and armature (22) are arranged at opposite sides of the motive device (3) and the force transmission member (9) extends through the motive device to transmit said force to the armature (22).
Claim 13
Dependent Claim
36 words
A valve according to Claim 1 or Claim 2 wherein the valve element (44) is secured to the pressure responsive device (40) for movement therewith and co-operates with a valve seat (26) on the armature (22).
Claim 14
Dependent Claim
37 words
A valve according to Claim 12 wherein the valve element (44) is hollow and forms a communication passage (44A) between the inlet (5) and outlet (19) when the valve element (44) is not engaged with said seat.
Claim 15
Dependent Claim
26 words
A valve according to Claim 12 or 13 wherein the pressure-responsive device is a piston (40) movable in a chamber communicating with the fluid inlet (5).
Claim 16
Dependent Claim
35 words
A valve according to Claim 14 wherein movement of the piston (40) under the action of the inlet pressure is limited by engagement of a flange (40C) of the piston with a fixed surface (B).
Claim 17
Dependent Claim
37 words
A valve according to Claim 15 wherein one or more flow control grooves (C) are provided between said piston flange (40C) and said fixed surface (B) for controlling the rate of pressure re-application through the outlet (19).
Claim 18
Dependent Claim
41 words
A valve according to any one of Claims 12 to 16 wherein the valve element (44) extends through the motive device (3) with clearance to provide a passage connecting the low-pressure side of the piston to a relatively low pressure area.
References Cited (Backward Citations)
No citation records indexed.
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