Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1992-04-02
1993-09-28
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13750511, 137210, G05D 1606
Patent
active
052479595
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multi-function valve of a kind, hereinafter referred to as of the kind described, comprising a housing with first and second chambers communicating via an internal port; the first chamber communicating with a first external port and incorporating a first fluid pressure-responsive element which is withdrawn against spring action in a direction away from the internal port in response to a pressure above a certain value in the first chamber; and the second chamber communicating with second and third external ports and incorporating a second fluid pressure-responsive annular element which is movable against spring action in response to a pressure above a certain value in the second chamber, the arrangement being such that advance of the first pressure-responsive element upon sufficiently low pressure occurring in the first chamber separates first and second complementary annular seatings respectively on a first closure element and on the housing around the internal port to place the first and second chambers, and hence also the first and second external ports, in communication with one another while the first and second chambers remain sealed from the third external port; withdrawal of the first pressure-responsive element upon sufficiently high pressure occurring in the first chamber withdraws a second closure element away from the first closure element to separate third and fourth annular seatings respectively on the first and second closure elements to place the first chamber, and hence the first external port, in communication with the third port through the first closure element and the second pressure-responsive element, whilst the second external port is sealed from the first and third external ports; and movement of the second pressure-responsive element upon sufficiently high pressure occurring in the second chamber separates fifth and sixth annular seatings to place the second chamber, and hence the second external port, in communication with the third annular port, whilst the first chamber is sealed from the second and third external ports.
The first and second pressure-responsive elements may each be, for example, a resilient or spring loaded bellows, or a spring loaded diaphragm.
A valve of this kind may be used as a low temperature valve in conjunction with a pressurized liquefied gas tank, to provide pressure build-up, pressure relief and economizer functions.
In one known valve of the kind described, the first and third seatings are provided concentrically on the first closure element which forms one end piece of a resilient bellows constituting the second fluid pressure-responsive element and the fifth seating is provided on an end piece at the opposite end of the bellows.
In accordance with one aspect of the present invention, in a multi-function valve of the kind described, the second fluid pressure-responsive element is a resilient bellows, which is movable in a direction away from the internal port in response to the pressure above the certain value in the second chamber, and which is sealed at one end to the third external port, the sixth seating being provided on an end piece at the opposite end of the bellows; the first closure element being a floating annular disk with the first and third seatings formed by raised concentric annular ribs on one face of the disk, and the fifth seating being formed as a raised rib on the opposite face of the disk.
The floating disc may have three concentric annular ribs in the same configuration on each of its faces, the first and third seatings being provided by the radially innermost and outermost ribs on one face, and the fifth seating being provided by the radially intermediate rib on the other face. The disk can then be used "either way up", and, upon servicing of the valve, can be "turned over" to provide three new unworn ribs as the first, third and fifth seatings.
With this arrangement, all the critical seatings are provided on the single floating annular disk, which can readily and cheaply be turned over or replaced if
REFERENCES:
patent: 2965121 (1960-12-01), Howlett
patent: 4624277 (1986-11-01), Veite
Cohan Alan
Meggitt (UK) Limited
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