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P.F.5 Code 1050 Fee $200 NEW ZEALAND PATENTS ACT 1953 <br><br>
NO. 230940 <br><br>
Date: 6 October 1989 CHANGE OF Of Wf SPECIFICATION <br><br>
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IMPROVEMENTS IN OR RELATING TO LIQUID CONTROL DEVICES <br><br>
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WE APEX ENGINEERING LIMITED of 1 Waikaukau Road, Glen Eden, Auckland, New Zealand a New Zealand company, do hereby declare the invention for which WE pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement: <br><br>
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This invention relates to liquid control devices and in particular is concerned with a filter or strainer incorporating a closure means whereby the filter can be incorporated into a pipeline or similar liquid passageway 5 and with operation of the closure means the filter isolated enabling its removal for cleaning. <br><br>
There is an increasing demand for a filter incorporating closure means as aforesaid suitable for use in domestic 10 dwellings and similar installations to reduced solid and semi-solid contaminates entering the system. The need to service the filter will generally be minimal and infrequent and it is preferable that it be a non-skilled operation to avoid unnecessary servicing costs. Thus 15 such a device needs to be of simple and readily understood operation. Further, as the device will be infrequently utilised its operational integrity needs to be reliable. '9f* <br><br>
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20 According to a first aspect of this invention thete "is provided a liquid control device comprising a body defining a cavity and incorporating an inlet port and an <br><br>
outlet port conjoining with inlet and outlet sections respectively of the cavity, the body detachably 25 supporting a bowl an interior of which conjoins with the inlet and outlet sections of the cavity, a stop cock and a flow operated non-return valve mounted in the body each <br><br>
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being adapted in their closed mode to close the inlet and outlet cavity sections respectively from the interior of the bowl, the non-return valve incorporating a closure element disposed on a downstream face of an apertured non-return valve body, the non-return valve body being assembled in the control device body as to dispose the closure element to be free to float in a restricted gap between the downstream face and an adjacent wall of the control device body, whereby with backflow, the closure element takes up a closed mode and closes off the aperture(s) therethrough and in an open mode inlet flow can completely dislodge the closure element clear of the non-return valve body enabling flow therethrough and a filter mounted in the bowl between the conjunctions of the bowl interior with the inlet and outlet sections of the cavity. <br><br>
In further describing the invention reference is made to the accompanying drawing (Fig.l) being a cross-sectional view of the device with a stop cock thereof depicted in an open mode and a non-return valve thereof depicted schematically on the left side as viewed in a close?i~Tnode and on the right as viewed in mnHo ^ <br><br>
the required design. The body 3 is adapted, such is by preferably comprises a brass <br><br>
In a preferred embodiment <br><br>
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way of inter-engaging screw-threads 5 to carry a bowl 6, disposed in a preferred manner of installation, to depend downwardly of the body 3 and described in more detail hereinafter. The body 3 defines a cavity, consisting of 5 three sections 7a, 7b and 7c, in the interior thereof with, in known manner, an inlet port 8 and an outlet port 9 being incorporated into the body 3 to conjoin with corresponding inlet and outlet sections 7a and 7b. Preferably the inlet and outlet ports 8, 9 are disposed 10 in line with one another with each being adapted in conventional manner with respective female and male screw-thread couplings. A stop-cock 10 assembly is disposed therebetween with a control spindle 11 and handle 12 projecting to one side in a conventional "T" 15 shaped stop-cock or tap configuration. <br><br>
Handle 12 of stop-cock 3 is preferably readily recognisable as such (to assist utilisation by unskilled personal) and includes a conventional spindle type 20 operational mechanism. More particularly with turning of the handle 12 a valve face 13 of spindle 11 opens and closes onto a valve seat 14 as more particularly described hereinafter. Preferably the disposition of the stop-cock 10 is substantially directly opposite the r <br><br>
25 mounting of the bowl 6 to the body 3 such that in situ the device can be mounted in its preferred dispositi with the handle 12 uppermost and the bowl 6 lowermost .fly <br><br>
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Body 3 preferably includes a skirt 15 extending downwardly thereof forming a cavity void section 7c within the confines of the skirt 15 Skirt 15 is preferably disposed substantially concentrically about the line of axis of rotation of the stop-cock spindle 11 and the valve seat 14. Valve seat 14 is formed on an annular edge section of an internal wall 3b of the body 3/ valve seat 14 extending about entry to an associated bore 16 formed through wall 3b to conjoin the inlet section 7a of the cavity to the void section 7c. <br><br>
Internal wall 3b separates the outlet section 7b of the cavity from direct communication with the inlet section 15 7a thereof. Wall 3b extends from inlet port 8 substantially completely across the top of the void section 7c and then normal to the axis of outlet port 9. The disposition of wall 3b is such as to form an opening 17 conjoining outlet port 9 to the void section 7c of the 20 cavity and thus also the interior of the bowl 6. As aforesaid bore 16 extends through wall 3b and preferably on the underside thereof an integral depending annular lip 18 is provided. Lip 18 forms a recess 19 thereabout which conjoins with opening 17 and also assists mounting 25 a non-return valve 20 to the body 3 as hereinafter <br><br>
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described. <br><br>
Preferably bowl 6 is of a cylindrical peripheral shape of a diameter essentially matching that of the skirt 15 with axially disposed ribs 22 being formed on the outer face to facilitate the screw-thread fastening and detachment 5 of the bowl 6 to the body 3. Preferably an annular flange 21 is provided on the outer face of the bowl 6 to act as a detent in contacting the skirt 15 when mounted thereto. Preferably an "0"-ring seal 23 is provided as depicted to assist the detachable sealing of the bowl 6 10 to the skirt 15. <br><br>
A flow operated non-return valve 20 is mounted in the innermost part of the void section 7c. Non-return valve 20 comprises a barrel shaped body 24 with an outer wall 15 25 depending as a skirt and incorporating an external screw-thread 5b thereon. Screw-thread 5b is engagable with screw-thread 5 on skirt 15 and thereby valve body 20 is mountable in body 3. Preferably an "0"-ring seal 31 is provided as depicted between an inner section of body 20 24 and an inner non screw-threaded section of skirt 15. Centrally valve body 24 incorporates an annular upstand 27 partially defining a bore 26 extending through body 24 and which aligns with bore 16 of wall 3b. The central section of body 24 is conjoined to the outer wall 25 by 25 radially extending webs 28 forming perforations 36 therebetween and which extend through the non-return valve body 24. Upstand 27 locates within lip 18 and as-* <br><br>
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depicted an M0M-ring seal 28 is preferably provided therebetween. With such mounting upstand 27 abuts wall 3b such as to form a gap 29 between the associated face 30 (the downstream face) of the valve body 24 and the lip 18 of body 3. <br><br>
A closure element 32 sits on the downstream face 30 of the non-return valve body 24 and to that end closure element 32 incorporates a central aperture 33 to clear upstand 27. Face 30 of the non-return valve body 24 acts as a support for the closure element 32. In assembly the closure element 32 is so positioned in the gap 29 as to be free to float within the restrictions thereof in particular to be dislodged/ by inlet flow, clear of-, face 30. Preferably closure element 32 is in the nature of a disc fabricated from resilient material such as rubber to facilitate sealing against face 30. ;n <br><br>
A filter 34 preferably in the nature of a metal--or plastics gauze of a frustro-conical configuration is disposed within the bowl 6 and associated void section 7c of the cavity. The wider end of the filter 34 is a close fit within the bottom of the bowl 6 and the filter 34 extends inwardly and upwardly to locate the inner end against the valve body 24 and in particular adjacently about the associated end of the bore 26 therethrough. <br><br>
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Thus, in use, the stop-cock 10 can be opened and incoming liquid flow (represented by arrows 35), conventionally mains-pressure water, can pass from the inlet port 8 through bore 16 and the associated central bore 26 to enter the interior of the filter 34. Following passage through the filter 34 the liquid can flow through the perforations 36 of the non-return valve 24, in so doing dislodging the closure element 32, (to an open mode as depicted at the right hand side of Fig.l) and through opening 17 to outlet port 9. With the closing of the stop-cock valve 13 against valve seat 14 any reverse liquid flow from outlet port 9 impinges the non-return valve disc 32 against face 30 (as depicted at the left hand side of Fig.l) thus closing-off the perforations 36. Thus flow in both directions is prevented and the bowl 6 can be detached and following cleaning of the filter 34 and re-assembly the stop-cock 10 opened to revert to the normal inlet flow operational mode of the device. <br><br></p>
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