GB2181216A - Plug valve - Google Patents

Plug valve Download PDF

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Publication number
GB2181216A
GB2181216A GB08623675A GB8623675A GB2181216A GB 2181216 A GB2181216 A GB 2181216A GB 08623675 A GB08623675 A GB 08623675A GB 8623675 A GB8623675 A GB 8623675A GB 2181216 A GB2181216 A GB 2181216A
Authority
GB
United Kingdom
Prior art keywords
plug
body
valve according
cap
plug valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08623675A
Other versions
GB8623675D0 (en
GB2181216B (en
Inventor
Malcolm Wheatley Phillipps
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philmac Pty Ltd
Original Assignee
Philmac Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AUPH273885 priority Critical
Priority to AU63175/86A priority patent/AU595239B2/en
Application filed by Philmac Pty Ltd filed Critical Philmac Pty Ltd
Publication of GB8623675D0 publication Critical patent/GB8623675D0/en
Publication of GB2181216A publication Critical patent/GB2181216A/en
Application granted granted Critical
Publication of GB2181216B publication Critical patent/GB2181216B/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08Details
    • F16K5/14Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/16Special arrangements for separating the sealing faces or for pressing them together for plugs with conical surfaces
    • F16K5/168Sealing effected by the flowing medium
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/02Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
    • F16K5/0207Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor with special plug arrangement, e.g. special shape or built in means

Abstract

In a tapered plug valve comprising a body 10, a releasable cap 28 and a tapered plug 20 at least partially surrounded by a sleeve 22 of elastomeric material deflectable by high fluid pressure applied through the valve inlet port, at least one O-ring seal is provided between the plug, and the body and cap assembly. The plug may be urged into the valve body by hydraulic pressure from the inlet port via a passage 36, and this maintains a sealing contact between the elastomeric material and the valve body surrounding the ports. Drain apertures 17 may be provided. <IMAGE>

Description

SPECIFICATION Plug valve This invention relates to a valve of a type where a tapered plug is movable within a similarly tapered socket between an off and anon position.

Background of the invention Plug valves are very well known and are in common use, but are subject to a numberofdisabilities. Firstly, the shape of the plug within the socket is likely to vary with time, and accordingly leakage can take place. Secondly, if the plugs are inserted with sufficient interference into the respective sockets to minimise leakage, they tend to become difficult to rotate. Thirdly, quite frequently the plugs are retained by means of nuts or otherthreaded members which projectthrough the small diameter end ofthe body, and this renders removal ofthe plug difficult if there is no access provided forthe underside ofthe body.

Briefsummary of the invention In an embodiment ofthis invention, a tapered plug of a plug valve is surrounded by a sleeve ofelastome- ric material which deflects upon high fluid pressure applied through the valve inlet port, leakagewhich might otherwise occur due to such deflection being absorbed by 'O' ring seals. The plug may also be urged intothevalve body by hydraulic pressure from the inlet port, and this maintains a sealing contact between the elastomeric material and the valve body surrounding the ports.

More specifically, in one embodiment of this invention, a plug valve comprises a body and cap assembly, the body having a tapered wall therein defining a plug socket, and respective port surfaces defining circumferentailly spaced inlet and outlet ports opening into said plug socket, a tapered plug con tained within the plug socketand having afluidflow passage extendingtherethrough, an elastomeric sleeve surrounding portion of the plug, said cap being a retaining cap releasably engaging the body and retaining the plug within its plug socket, and at least one '0' ring seal between the plug and the body and cap assembly.

If a resilient sleeve surrounds the plug, then very high pressure imparted against the plug from the inlet end ofthe valve can cause lateral movement of the plug within the socket, and although the outlet aperture is sealed by the resilient sleeve, there can nevertheless be "back leakage" and to accommodatethisproblem in afurtherembodimentofthein vention at least one ofthe body, the retaining cap or the plug upperend is provided with an '0' ring (or other seal) such that the'0' ring will retain the plug in sealable engagement with the body and retaining cap even if the plug is minutely displaced laterally by a short distance.

Because ofthe tapered cross sectional shape of the plug, there is a tendency for hydraulic pressure from the inletend to liftthe plug away from the socket walls so that the leakage can occur. In a furtherembodiment ofthis invention, the body comprises a bleed aperturefrom the inlet end intothespacebetween the plug and its retaining cap, so that there is a differential pressure urging the plug into the socket which will retain the plug against outward displacement.

Briefdescription of the drawings Two embodiments of the invention are described hereunder in some detail, with reference to, and are illustrated in, the accompanying drawings, in which Figure 1 is an elevational section through a plug valve, according to a first embodiment, Figure2 is a central cross section through same, taken on line 2-2 of Figure 1, Figure3 is an elevational section according to a second embodiment, Figure4isan end elevation of Figure3, and Figure5is an elevational section similarto Figure 3, but illustrating a construction without a relief hole (35).

Detailed description of the preferred embodiments Referring first to the embodiment of Figures 1 and 2, a valve body 10 containsatapered wall defining a tapered plug socket 11, and inlet and outlet ports 12 and 13 extend from diametrically opposite sides of the socket wall. The outlet end of the tapered wal I is provided with a parallel surface 14 and the lower end also with a parallel surface 15 but of smallerdiameter. Below the socket wall there is a discoid end 16 but this is providedwith drain apertures 17.

Atapered plug 20 is rotatable within the plug socket 1 1,the plug 20 having an outwardly extending key 21 by which it can be rotated, and being formed from rigid moulded material (forexampleacetal).

The key 21 connects to plug 20 bya spigot-and- socket latching connection, as best seen in Figure 3.

The plug 20 has a sleeve 22 of elastomeric material (for example polyurethane) moulded thereon. The sleeve 22 of polyurethane is in sealable engagement with the tapered surface of the plug socket 11 in the body 10.The poiyurethane is injectedthrough a cen- tral injection aperture 18 and forms a lining 19 of plug 20, some ofthe polyurethane remaining in the aperture. All the polyurethane is a single monolithic mass.

The lower end ofthe plug 20 is provided with a re silient '0' ring 23 which slidably engages the lower parallel surface 15 below the socket, while the upper end is provided with a second resilient '0' ring 24 which slidably engages a parallel surface 26 in a retention cap 28the retention cap threadably engag- ing the body to form said body and cap assembly.

Intermediate their ends there is provided a third re silient'0' ring 27 which slidably engages the parallel surface 14abovethesocket 11.Afourth 'O' ring 29 seals the cap 28 to the body 10.

Since it is possible that the plug valve may be requires to be used with pipes which may vary in size, the retaining nuts 30 contain within them respective compression rings 3l,these compression rings 31 having respective outwardly tapered surfaces which engage complementarytapered surfaces in respective nuts 30, and containing barbs 32 which engage over the outer surface of a pipe to be secured to the valve. A sealing '0' ring 33 is used in each instance between an innerwall of the body 10 and the insert 34.

As shown, there is a relief hole 35 which is located below the intermediate '0' ring 27 near outlet port 13, and there is located a high pressure inlet hole 36 which extendsfromthe inlet port 1 2 to the space between the '0' rings 24 and 27.

The arrangement is such that the elastomersurrounding the tapered portion of the plug deforms slightly in a lateral direction upon the application of high pressuretothe plug, but this deformation isac- commodated by the resilience ofthe '0' rings 23,24 and 27, and in practice it is an easy matterto produce a valve which does not leak even under very high pressure. However high pressure also imparts a downwards thrust on the plug 20 due to ingress of water into the space between the '0' rings 24 and 27, and this is effective in maintaining sealing contact between the resilient elastomeric sleeve and the plug socket walls. The relief hole 35 allows any liquid which may betrapped belowthat'0' ring to be discharged readily into the outlet port 13.

The second embodiment of Figures 3 and 4 is gen erallysimilartothefirst, and similar designations identify similar elements. However, in Figure 3 there is no inner '0' ring 23, and the underside of plug 20 comprises a skirt40 which forms an air entrapment space, and avoids the need for drain apertures 17. '0' ring 24 is arranged slightly differently from the first embodiment. Figure 3 also clearly identifies the spigot-and-socket connection between the plug 20 and its key 21.

FigureS shows a furthervariation, wherein the cone angle ofthe plug 20 is slightly greaterthan in Figure 3, and this enables so much reduction in the clearance space below '0' ring 27 that the necessity for the pressure relief hole is removed.

Claims (10)

1. A plug valve comprising a body and cap assembly, the body having a tapered wall therein defining a plug socket, and respective port surfaces def ining circumferentially spaced inlet and outlet ports opening into said plug socket, atapered plug contained within the plug socket and having a fluid flow passage extending there through, an elastomeric sleeve surrounding portion ofthe plug, said cap being a retaining cap releasablyengaging the body and retaining the plug within its plug socket, and at least one '0' ring seal between the plug and the body and cap assembly.
2. A plug valve according to claim 1 wherein said body further comprises a parallel wall extending from the outerend of tapered wall, and said plug comprises a circumferential groove containing an 'O' ring seal which sealably and slidably engages said parallel wall.
3. A plug valve according to claim 1 orclaim 2 wherein said cap contains a circumferential groove containing an 'O' ring seal which sealably and slid ably engages a surface of said plug.
4. A plug valve according to claim 1 orclaim2 wherein said plug contains a further circumferential groove containing an '0' ring seal which sealably and slidably engages a surface of said cap.
5. A plug valve according to claim 3 or claim 4 wherein said plug contains a still further groove near its inner end which sealably and slidably engages a surface of said body near its inner end, and said body inner end contains at least one drain aperture.
6. A plug valve according to any preceding claim wherein said elastomericsleeve is monolithic with an elastomeric lining defining said fluid flow passage through said plug.
7. A plug valve according to claim 6 wherein said plug comprises a central injection aperture at least partly containing elastomeric material of said sleeve and lining.
8. A plug valve according to any preceding claim further comprising a key extending outwardly from the plug and secured thereto with a latching spigotand-socket connection.
9. A plug valve substantially as herein described with reference to and as illustrated in Figures 1 and 2.
10. A plug valve substantially as herein described with reference to and as illustrated in Figure 3.
GB8623675A 1985-10-03 1986-10-02 Plug valve Expired - Fee Related GB2181216B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AUPH273885 1985-10-03
AU63175/86A AU595239B2 (en) 1985-10-03 1986-09-26 Plug valve

Publications (3)

Publication Number Publication Date
GB8623675D0 GB8623675D0 (en) 1986-11-05
GB2181216A true GB2181216A (en) 1987-04-15
GB2181216B GB2181216B (en) 1990-01-24

Family

ID=25633843

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8623675A Expired - Fee Related GB2181216B (en) 1985-10-03 1986-10-02 Plug valve

Country Status (1)

Country Link
GB (1) GB2181216B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6287231B1 (en) * 1997-06-09 2001-09-11 Gilbert W. Younger Methods and systems for improving the operation of transmissions for motor vehicles
WO2006046113A1 (en) * 2004-10-27 2006-05-04 Enolgas Bonomi S.P.A. Fluid shut-off valve

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB874037A (en) * 1958-07-18 1961-08-02 Kinematics Ltd Improvements in or relating to rotary valves
GB1039400A (en) * 1963-11-27 1966-08-17 Texsteam Corp Fluid flow control valve
US3575379A (en) * 1969-08-01 1971-04-20 Walworth Co Encapsulated plug valve
US3687416A (en) * 1970-11-30 1972-08-29 Frank H Mueller Rotary plug valve
US3825030A (en) * 1973-03-20 1974-07-23 Acf Ind Inc Lined valves
US4055324A (en) * 1976-04-29 1977-10-25 Hughes John F Plug valve assembly
EP0123454A2 (en) * 1983-03-28 1984-10-31 Garlock Inc. Plug valve with floating stem seal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB874037A (en) * 1958-07-18 1961-08-02 Kinematics Ltd Improvements in or relating to rotary valves
GB1039400A (en) * 1963-11-27 1966-08-17 Texsteam Corp Fluid flow control valve
US3575379A (en) * 1969-08-01 1971-04-20 Walworth Co Encapsulated plug valve
US3687416A (en) * 1970-11-30 1972-08-29 Frank H Mueller Rotary plug valve
US3825030A (en) * 1973-03-20 1974-07-23 Acf Ind Inc Lined valves
US4055324A (en) * 1976-04-29 1977-10-25 Hughes John F Plug valve assembly
EP0123454A2 (en) * 1983-03-28 1984-10-31 Garlock Inc. Plug valve with floating stem seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6287231B1 (en) * 1997-06-09 2001-09-11 Gilbert W. Younger Methods and systems for improving the operation of transmissions for motor vehicles
WO2006046113A1 (en) * 2004-10-27 2006-05-04 Enolgas Bonomi S.P.A. Fluid shut-off valve

Also Published As

Publication number Publication date
GB2181216B (en) 1990-01-24
GB8623675D0 (en) 1986-11-05

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921002