AU646561B2

AU646561B2 - Jumper valve

Info

Publication number: AU646561B2
Application number: AU16141/92A
Authority: AU
Inventors: Jeremy Lansell
Original assignee: LCL Pty Ltd
Current assignee: Ryemetal Pty Ltd
Priority date: 1991-05-08
Filing date: 1992-05-08
Publication date: 1994-02-24
Anticipated expiration: 2012-05-08
Also published as: AU1614192A

Description

64~~56 teation 3. 2

AUSTRALIA

Patert,.s Acet 1990

OIINAL

COM:PLETE S PECIFICATION STANDARD PATENT Invention Ti tle: Jumper valve The following statement Is a full description of this Invention, including the blast method of performing It known to us., IP52887/IP 08/05/92 1.

Jujper Valve Field of the invention The invention relates to a jumper valve for use in regulating the flow of fluid through pipelines. In pa:rticular the jumper valve is adapted to reduce the phenomenon known as water hammer.

Background to the invention In fluid pipelines, in particular water pipelines, when valves are closed to regulate the flow of fluid a banging or hammering noise may occur.

This phenomenon is known as water hammer. This is believed to occur 10 when pressure waves are transmitted along fluid lines as a result of a sudden stop in the flow of fluld. These pressure waves can cause damage to devices attached to the fluid lines such as relief valves brazed and compression joints.

"Quite apart from the damage which water hammer could cause to devices 15 connected to the fluid line, the noise associated with this phenomenon is very disconcerting.

One approach to reducing water hammer has been disclosed in Australian Patent No. 569040 which discloses a disc washer has'ing a spring located about the stem of the disc washer. In one end of the disc washer a recess is located which is formed about the stem in the valve body. However, as a recess must be formed in the valve body MPS0100/PS 08/05/92 2 additional manufacturing is required which entails the use of an intricate turning tool to form the recess.

Description of the embodiment of the invention It is an object of the invention to provide a jumper valve of simple manufacture and assembly which will effectively reduce the occurrence of water hammer when installed in a pipeline through which fluid flows.

With this in mind, a jumper valve is provided including: a valve body having a lower surface, a valve sealing surface projecting from the 10 lower surface, and an upper surface; (ii) a valve stem projecting from the upper surface; (iii) retaining means: and (iv) resilient manes interposed between the retaining means and the upper surface, C C wherein the retaining means: 15 retains the resilient means interposed between such means and the upper surface; is movable up and down the stem upon expansion and compression respectively of the resilient means; and includes a housing to limit the compression of the resilient means.

It is preferred that the retaining means be in frictional engagement with the valve.

FHPMELC4\93327023.8- 1 December 1993 (11:01) 3 The retaining means may preferably be an annular disc having an inner diameter approximating the diameter of the valve stem when it is of circular cross-section. A plastic washer of suitable dimensions may be used as the retaining means.

The housing may comprise a circular base having a central opening to allow movement of the stem through the housing and a hollow cylindrical projection extending from the circular base (forming the housing into a cup shape) to surround at least a portion of the resilient means.

The housing described above may be integral with the retaining means. Alternatively, in a typical preferred embodiment of the invention, the retaining means and the housing 10 will be separate components, in which case the retaining means is preferably an annular disc as described above.

The resilient means may preferably be a spring or compressible material capable of rebounding substantially to an original uncompressed condition.

In operation, as a spindle of a closing valve assembly a tap) is lowered, it contacts 15 the retaining means pushing the whole jumper valve down towards a valve seat to interrupt a fluid flow. The jumper valve engages the valve seat of the closing valve assembly. If the spindle is continued to be lowered, pressure upon the retaining means move it, FHPMELC4\93327023.8 1 December 1993 (11:01) and the resilient means towards the upper surface of the valve body reinforcing the seal with the valve seat.

Continued movement of the spindle down over the stem causes the resilient means to compress and the hollow cylindrical projection of the housing to completely envelop the resilient means and engage the upper surface of the valve body. This ensures that the resilient means cannot be damaged by too much compression.

In this arrangement, the resilient means ensures that the sealing and unsealing of the valve body with the valve seat is not sudden and the phenomenon of water hammer is reduced.

Brief description of the drawings 3The invention will now be further illustrated with reference to the attached drawings in which:

S.

Figure 1 is an exploded drawing of the jumper valve according to one 15 form of the invention; Figure 2 is a perspective view cf an assembled jumper valve according to the invention; Figure 3 is an assembly side view of the jumper valve of figure 2; Figure 4 is a plan view of the jumper valve of figure 2.

MPS0100/PS 08/05/92 A jumper valve is depicted in the drawings comprising a valve body 1 having a valve sealing face 2 on its lower surface and a valve stem 3 attached to an upper surface ol! valve body 1. The valve sealing face 2 can be of any suitable configur nlon. Typically, the valve stem 3 is cylindrical and is connected to valve body as one piece, i.e. it is of unit construction.

A spring 4 of diameter larger than the diameter of valve stem 3 is placed over and partially encircles valve stem 3. Spring 4 does not need to be connected positively to either valve body 1 or valve stem 3. A spring housing 5 is thereafter placed onto valve stem 3 and spring 4 is partially located within spring housing Spring housing 5 comprises a base 6 and a cylindrical projection 7 forming a cup-like housing. The depth of the cylindrical projection 7 defines the depth to which spring 1 may be compressed by movement of housing 5 along valve stem 3 towards the valve body 1. The cylindrical projection 7 will ultimately engage the upper surface of valve body 1.

This is designed so that spring 4 cannot be over compressed and damaged.

A retaining washer 8 having an aperture the same as or only slightly e.

20 smaller than the diameter of stem 3 can be inserted over valve stem 3.

Retaining washer 8 is engaged with valve stem 3 and will be adapted to move along valve stem 3 but not be easily removed from valve stem 3.

This washer may be of plastic material.

MPSO100/PS 08/05/92 In operation, a spindle body of a valve closing assembly has an aperture bigger than the diameter of valre stem 3. As such the valve stem 3 is inserted in that aperture. The aperture has a depth longer than the depth of valve stern 3. When llhe spindle body is moved down it engages the retaining washer 8 forcing it down along valve stem 3. The spring housing 5 is likewise moved down against the spring 4 which in turn moves the valve body 1 and its valve sealing surface against a valve seat (not shown). This closing interrupts the fluid flow.

If the spindle continues to be moved down, the spring 4 is compressed until it is entirely located within Hhe spring housing 5. In this position the cylindrical projection of spring housing 5 engages the upper surface of valve body 1 and the spindle's downward movement cannot be continued.

As such the influence of the movement of valve body 1 towards and engagement with the valve seat is a gradual process and under the influence of spring 4 a sudden closure of the pipeline (not shown) is avoided. This has been found to reduce the phenomenon of water hammer.

In contrast to the prior art, the jumper valve acc3rding to the invention 20 does not require any special turning of recesses or introduction of complex componentry. It is easily assembled and disassembled.

Consequently, considerable advantages, both economic and in-service, are envisaged by adoption of a junper valve according to the invention.

MPS0100/PS 08/05/92

Claims

1. A jumper valve including; a valve body having a lower surface, a valve sealing surface projecting from the lower surface, and an upper surface; (ii) a valve stem projecting from the upper surface; (iii) retaining means and (iv) resilient means interposed between the retaining means and the upper :.surface, S.:i wherein the retaining means: .:.ooi retains the resilient means interposed between such means and the upper surface o is movable up and down the stem upon expansion and compression respectively of the resilient means; and S S(c) includes a housing to limit the compression of the resilient means.

2. A jumper valve according to claim 1 wherein the retaining means frictionally engages the valve stem.

3. A jumper valve according to claim 1 or claim 2 wherein the retaining means comprises an annular disc having an inner diameter substantially equal to the diameter of the valve stem.

4. A jumper valve according to claim 2 or claim 3, wherein the housing comprises a circular base having a central opening to allow movement of the stem through the housing, and a hollow cylindrical projection extending from the circular base to surround at lease a portion of the resilient means.

FHPMELC4\93327023.8 1 December 1993 (11:01) 8 A jumper valve according to any one of the claims 1 to 4, wherein the resilient means comprises a spring which encircles the valve stem.

6. A jumper valve substantially as hereinbefore described with reference to the drawings. S S S S S.. S S S LCL PTY LTD November 1993 FHPMELC4\93327023.8 1 December 1993 (11:01) ABSTRACT A jumper valve comprising a valve body having a lower surface, a valve sealing surface projecting from the lower surface, and an upper surface; a valve stem projecting from the upper surface; retaining means; and resilient means interposed between the retaining means and the upper surface, wherein the retaining means is adapted to retain the resilient means interposed between such means and the upper surface and to move up and down the stem upon expansion and compression respectively of the resilient means. S S S. 0 S 5.55 IP55606/IP 08/05/92