US 5,582,198 AGranted

Bidirectional valve and fuel shut-off device

AssigneeToyoda Gosei Co., Ltd.

InventorsYoshihiro Nagino, Hiroshi Nishi

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Abstract

A fuel shut-off device in which easier assembly and improved air-tight sealing can be achieved. A partition wall plate is ultrasonically welded to a fixing steplike portion of a case body to form an air-tight bidirectional valve chamber comprising the partition wall plate and the case body. The bidirectional valve chamber accommodates a bidirectional valve composed of a positive pressure valve mechanism and a negative pressure valve mechanism. A negative pressure valve member of the negative pressure valve mechanism and a negative pressure spring are formed into an integral structure with a positive pressure valve member of the positive pressure valve mechanism. The positive pressure valve member is formed into an integral structure with the partition wall plate by the engagement of an engaging ring-shaped member of a valve receiving member and an engaging arc-shaped member of the partition wall plate. These form a sub-assembly which is passed through an opening of the case body at the lower end and assembled to the case body from one direction. This completes the accommodation of the bidirectional valve.

Claims19

Dependent claims

A bidirectional valve comprising:

a housing having a first opening and a first exit port provided therein and spaced apart from each other;
a partition wall covering said first opening, said housing and said partition wall enclosing a valve chamber in open communication with said first exit port, said partition wall having a first orifice therein that allows communication between said valve chamber and the exterior of said valve chamber;
a valve assembly mounted within said valve chamber, said valve assembly comprising first and second valve members both of which are yieldably held in a normally closed position, said first valve member having a second orifice therein,
wherein said second valve member is operatively associated with said second orifice to open or close said second orifice, and said first valve member is operatively associated with said first orifice to open or close said first orifice, said first and second valve members opening or closing in response to pressure changes within either said exterior of said valve chamber or within said valve chamber,
wherein said partition wall further includes an engaging member that limits the vertical movement of said first valve member and is able to engage said first valve member.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/426,947Filed 21 Apr 1995
Priority: JP 6-11384528 Apr 1994
Granted: 10 Dec 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F16K 24/044
Actuated by a float: the float being rigidly connected to the valve element, the assembly of float and valve element following a substantially…
B60K 15/03519
Characterised by venting means: valve arrangements in the vent line
F16K 17/196
Equalising valves predominantly for tanks: spring-loaded
F16K 17/36
Safety valves; Equalising valves, e.g. pressure relief valves: actuated in consequence of extraneous circumstances, e.g. shock, change of position