Fluid handling – With indicator – register – recorder – alarm or inspection means – Fluid pressure responsive indicator – recorder or alarm
Patent
1989-10-13
1991-02-05
Rivell, John
Fluid handling
With indicator, register, recorder, alarm or inspection means
Fluid pressure responsive indicator, recorder or alarm
285924, 210232, 210DIG17, F16K 3700, B01D 4642
Patent
active
049896369
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a coupling for a pressure or vacuum fluid system and more particularly though not exclusively to a fitting for mounting a filter bowl to a filter housing head of a compressed air filter.
BACKGROUND ART
A coupling having separate plastics bowls and bowl guards, in which the bowl guard is attached to a header by a bayonet fitting controlled by a locking pin is described in patent specification No. GB-A-2052297 (Wilkerson Corporation)
DISCLOSURE OF THE INVENTION
This invention is based on the realization that by using a pivoted locking member rather than a sliding locking member as in the Wilkerson coupling, an operable interconnection can be established between the locking member and a pressure relief valve in the filter bowl so that when the locking member is displaced from its locking position and a pressure differential exists across the valve an audible hiss of gas flow through the valve is apparent.
Broadly stated the invention provides a coupling for a pressure or vacuum fluid system comprising:
first and second members that connect together by relative rotation to engage bayonet coupling means thereof and when connected together have outer walls overlapping with an intervening seal therebetween;
a pressure relief valve in one of the members;
latch means that engages at an angular position of said members where the bayonet coupling is established to prevent relative rotation of said members and that is prevented from engagement at other angular positions, the latch means being decoupled from the valve when in its engaged state but being operatively coupled to the valve when in a disengaged state to open said valve, fluid flow therethrough providing an audible warning when a pressure differential exists across the valve.
More specifically the invention provides a coupling for a pressure or vacuum fluid system comprising first and second members arranged to interfit by a bayonet coupling to bring outer walls into overlapping engagement with an intervening seal therebetween, the first member having a pressure relief valve coupled to a latch that fits into a catch recess in the second member when the bayonet coupling is in its engaged state, the arrangement being such that when the latch is other than home in the catch recess the pressure relief valve is open and fluid flow therethrough provides an audible warning when a pressure differential exists across the valve.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which corresponding parts are identified by the same reference numerals, and:
FIGS. 1 and 2 are top plan and underneath bottom views, respectively of a filter bowl;
FIG. 3 is a fragmentary view of a head and the upper part of a filter bowl partly in section to reveal hidden details;
FIG. 4 is a section of the bowl and head on the line A--A of FIG. 2;
FIG. 5 is a view in vertical section of a second form of the filter bowl and head;
FIG. 6 is an exploded view of a valve that fits into the filter bowl of FIG. 5;
FIG. 7 is a perspective cut-away view of the upper part of the bowl of FIG. 5; and
FIG. 8 is a sectional view of part of the filter bowl showing the valve also in section.
BEST MODE FOR CARRING OUT THE INVENTION
In FIGS. 1-4 of the drawings a filter bowl 10 houses a filter element 12 or an activated carbon adsorbtion element or a combined filter and adsorption element which is supported at its lower end on a shoulder (not shown) within the bowl 10. The mouth of the bowl 10 is formed with a transition region 14 leading to a radially enlarged region 16. The outer face of region 16 is formed with a vertical shoulder 18 above which is a groove 20 in which an O-ring 22 fits, the upper end of groove 20 being bounded by a containment rib 24 which prevents the O-ring from being displaced as the bowl 10 is demounted from its filter housing head 26. Internally the mouth of bowl 10 has at transition region 14 a horizontal shoulder
REFERENCES:
patent: 3124157 (1964-03-01), Krzewina
patent: 3179444 (1965-04-01), Lansky et al.
patent: 4126558 (1978-11-01), Luceyk
patent: 4422675 (1983-12-01), Norris et al.
patent: 4678572 (1987-07-01), Hehl
Hawker Michael J.
Hunter George S.
Process Scientific Innovations Limited
Rivell John
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