WO2002025150A1 - Relief valve - Google Patents
Relief valve Download PDFInfo
- Publication number
- WO2002025150A1 WO2002025150A1 PCT/NZ2001/000196 NZ0100196W WO0225150A1 WO 2002025150 A1 WO2002025150 A1 WO 2002025150A1 NZ 0100196 W NZ0100196 W NZ 0100196W WO 0225150 A1 WO0225150 A1 WO 0225150A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- jumper
- valve assembly
- valve
- outer peripheral
- housing
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0486—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with mechanical actuating means
Definitions
- This invention relates to a relief valve and in particular, but not exclusively to a pressure relief valve assembly including an improved jumper, diaphragm and valve adjustment assembly.
- Relief valves in the form of pressure and temperature relief valves are widely used to protect against over pressure or high temperatures occurring within a pipeline or reservoir containing a fluid.
- a typical application of PTR valves is in safety protection for the temperature and pressure within hot water cylinders.
- PTR valves relieve excess pressure from the hot water cylinder once the pressure exceeds a predetermined threshold. As the water in the hot water cylinder is heated, it expands due to thermal expansion. If the hot water system is closed, the pressure of the whole system will increase.
- Typical PTR valves that include a pressure relief function have a valve assembly known as a jumper pressed against a valve seat by a compression spring to form a seal between the jumper and valve seat. Should the pressure applied to the jumper exceed the opposing force applied by the compression spring, the jumper assembly is disengaged from the valve seat and the pressure is relieved through an outlet. Once the pressure drops sufficiently so that the compression spring can force the jumper back onto the valve seat, the valve closes preventing the flow of fluid from its inlet to the outlet.
- a temperature relief function may be provided by locating a temperature-dependent expandable material adjacent to the jumper so that when the material expands at higher temperatures, it pushes the jumper away from the valve seat, opening the valve.
- the jumper in PTR valves at present provides a potential point of leakage. Although a washer is typically provided to press against the valve seat, leakage may still occur. Furthermore, the jumper can be time consuming and complex to assemble, increasing the cost of manufacture.
- a seal is typically provided against the outer periphery of the jumper.
- the friction of the seal against the jumper can cause hysteresis in the valve operation, reducing its accuracy.
- the sliding of the jumper along the seal reduces the lifespan of the seal.
- a relief valve assembly including a housing having an inlet, an outlet and a passageway interconnecting the inlet and outlet, a valve seat and a jumper including a valve seal, wherein the jumper is moveable to engage and disengage the valve seal with the valve seat thereby respectively closing or opening the passageway, and wherein the jumper is a discrete moulded component which presents an integral surface at least across said valve seat when engaged with the valve seat.
- a relief valve assembly including a housing having an inlet, an outlet and a passageway interconnecting the inlet and outlet, a valve seat and a jumper including a valve seal, wherein the jumper is moveable to engage and disengage the valve seal with the valve seat thereby respectively closing or opening the passageway, and wherein the valve seal is engaged with the jumper in such a manner that the jumper exerts substantially no compressive force on the valve seal when the valve seal is disengaged from the valve seat.
- the jumper may be a discrete moulded component of the relief valve assembly.
- the jumper may be constructed from a plastics or resin material.
- valve seal is located within a channel or groove within the jumper.
- valve seal may mechanically engage said channel or groove.
- valve seal may be chemically bonded to the jumper.
- the relief valve assembly may further include a sealing means sealingly engaged between an internal surface of the housing and an outer surface of the jumper, the sealing means including an outer peripheral portion engaged with the housing and an inner peripheral portion engaged with the jumper and wherein the sealing means includes a flexible portion between said inner and outer peripheral portions to facilitate relative movement between the inner and outer peripheral portions parallel to the movement of the jumper in use to engage and disengage the valve seal from the valve seat.
- a sealing means sealingly engaged between an internal surface of the housing and an outer surface of the jumper, the sealing means including an outer peripheral portion engaged with the housing and an inner peripheral portion engaged with the jumper and wherein the sealing means includes a flexible portion between said inner and outer peripheral portions to facilitate relative movement between the inner and outer peripheral portions parallel to the movement of the jumper in use to engage and disengage the valve seal from the valve seat.
- the width of the flexible portion may be substantially the minimum required to allow relative movement of the inner and outer peripheral portions to substantially the same extent as the relative movement of the jumper and housing in use.
- the outer peripheral portion of the sealing means may be secured to the housing and the inner peripheral portion frictionally engaged with the jumper.
- the inner and outer peripheral portions may include a boss extending around the periphery of the sealing means.
- the outer peripheral portion of the sealing means may be engaged between two portions of the housing.
- said jumper may form part of a jumper assembly, the jumper assembly including the jumper, a spindle engageable with the jumper and an adjusting nut including a thread engaged with a corresponding thread on the spindle, wherein the adjusting nut is slideably engageable with the jumper thereby allowing movement of the adjusting nut along the axis of the spindle and preventing rotational movement of the adjusting nut in use and wherein the jumper is adapted to engage with the housing of the relief valve in a manner preventing rotational movement of the jumper.
- the spindle may engage with the jumper at least partially through a washer engaged with the spindle, wherein the jumper includes a tapered surface adapted to receive the washer.
- the tapered surface may have a conic or annular vertical section.
- the jumper may include at least one protrusion extending from an outer surface thereof and the housing may include one or more receptacles to accommodate the protrusion so as to constrain the jumper to move substantially linearly substantially along one axis.
- a relief valve assembly including a sealing means for sealingly engaging between an internal surface of a housing of the relief valve assembly and a moveable jumper, the sealing means including an outer peripheral portion suitable for engagement with an internal surface of the housing and an inner peripheral portion adapted to engage with the outer periphery of the jumper and wherein the inner and outer peripheral portions are separated by a flexible portion facilitating relative movement of the inner and outer peripheral portions substantially transverse to a plane defined by said inner and outer peripheral portions.
- the inner and/or outer peripheral portions may include a boss around the perimeter of the sealing means.
- the boss of the inner peripheral portion may have a substantially circular cross-section.
- the boss of the outer peripheral portion may have a substantially U- shaped cross-section.
- the width of the flexible portion may be sufficient to allow the inner and outer peripheral portions to move relative to each other to an extent substantially equivalent to the expected movement of the jumper during use thereof.
- Figure 1 shows a cut-away view of a pressure and temperature relief valve according to one embodiment of the present invention
- Figure 2 shows a cut-away perspective view of a jumper of the relief valve shown in Figure 1 ;
- Figure 3 shows an exploded view of the jumper assembly of the relief valve of Figure 1 ;
- Figure 4 shows a cut-away perspective view of an alternative embodiment of the jumper of the relief valve shown in Figure 1 .
- FIG. 1 a cut-away view of a pressure and temperature relief valve according to one aspect of the present invention is shown.
- the relief valve of Figure 1 has been designed to conform to the Australian Standard 1 357.1 , which is hereby incorporated by reference in its entirety where appropriate. Therefore, the valve body 1 including an inlet chamber 2 and outlet chamber 6 have substantial similarities to the design in the Australian standard.
- auxiliary relief device 1 1 which is formed integrally with the valve body 1 .
- the auxiliary relief device 1 1 is not a separate component, the risk of a leak occurring through any engagement portions between a separate relief device with the body of the valve is avoided. Furthermore, the number of components to assemble is reduced, resulting in efficiencies in assembly and in the cost of manufacture.
- the auxiliary relief device 1 1 includes an internal bore 14 to accommodate a spindle 1 2 and a washer 1 3. If the internal pressure within the outlet chamber 6 exceeds the resilience of the washer 1 3, which may occur should the outlet 6 become blocked, the washer 1 3 deflects, allowing the spindle 1 2 and washer 13 to move into the bore 14 and open a passage from the inlet 2 to the vent hole 1 5.
- a machine tool may be applied from the opposite side of the relief valve through the end of outlet 6. This allows both the outlet 6 and bore 14 to be formed within the valve body 1 from one side of the valve, resulting in efficiency gains in production.
- a valve member or jumper 3 is provided as part of a jumper assembly 4.
- the jumper 3 engages with a valve seat 5 to close the passageway between the inlet 2 and outlet 6.
- the jumper 3 is able to move linearly along its axis to engage and disengage the seal 1 6 with the valve seat 5.
- the valve seat 5 is sealingly engaged with the inner peripheral wall of the valve body 1 , the sealing function assisted by a valve seat seal 7.
- the jumper 3 is an integrally formed component and therefore leaks through the jumper 3 are avoided.
- the integral and continuous surface across the valve seat 5 prevents any leaks through the jumper 3.
- the number of components of the valve are reduced by having an integrally formed jumper 3, reducing cost and simplifying assembly.
- the jumper 3 is formed by moulding a plastics or resin material into the required shape, which may include a channel or groove to accommodate the seal 1 6.
- the seal 1 6 is formed by moulding rubber or other flexible material directly into the jumper channel or groove.
- This seal 16 may be chemically bonded to the jumper 3 or bonded using any other appropriate technique known in the art, for example through the use of an adhesive or frictional or interlocking engagement.
- the seal 1 6 may be installed in a substantially unstressed state. In this way the only stress applied to the seal 1 6 is that induced by the compression spring 8 in forcing the seal 1 6 onto the valve seat 5. This stress reduction may reduce the instances of compression failure of the seal 1 6 compared to the valves of the prior art.
- the seal 1 6 may be bonded to the jumper using a suitable adhesive such as an alcohol based adhesive.
- a suitable adhesive such as an alcohol based adhesive.
- existing jumper assemblies comprise many components including a rubber washer. The components are riveted or screwed together. The compression applied to the washer during the assembly process will compress the rubber into any cavities within the assembly, creating the necessary water-tightness for valves correct function.. If the cavities are not completely filled, or the rubber washer can deflect under water pressure, a leak will ensue.
- Rubber can only withstand a certain compression load before yielding to failure. As extra loading is applied to the washer during final valve construction and during valve operation, it could be possible for assemble pre-loading with additional operational loading to exceed the compressive strength of the washer resulting in failure and subsequent leaks.
- Forming the jumper 3 from a plastic or resin may have a number of advantages including reduction in cost and ease of manufacture.
- a plastic jumper 3 may also prevent the buildup of mineral deposits such as calcium which may otherwise jam the jumper 3 in either an open or closed position.
- Figure 4 shows a sectional view of an alternative embodiment of the jumper 3.
- the jumper 3' is has a groove 41 adapted to mechanically secure a seal 1 6' .
- the groove 41 may be shaped to retain the seal 1 6' without the need for an adhesive, for example by interlocking of the seal 1 6' and the jumper 3', although adhesive may be used to provide additional resistance to separation of the seal 1 6' from the jumper 3' and/or to prevent leakage past the seal 1 6' into the body of the valve.
- the jumper in Figure 4 has the disadvantage of providing a possible leak path around the seal 1 6'. This is in contrast to a moulded jumper such as the jumper 3 that presents a continuous integral surface across the valve seat.
- a compression spring 8 is provided between a cover 1 9 and an adjusting nut 24 engaged with a spindle 23.
- the compression spring 8 generates a downward force onto the adjusting nut 24, which pushes the spindle 23 down onto the washer 32 (see Figure
- the adjusting nut is engaged with the jumper 3 so that rotation of the adjusting nut 24 upon rotation of the spindle 23 is prevented (see Figures 2 and 3). Therefore, the spring 8 is not rotated during adjustment, as the adjusting nut 24 moves axially without rotating. This avoids the problem of the spring binding or digging into the cover 1 9 and/or adjusting nut 24.
- a washer is typically provided to overcome this problem and thus the valve of the present invention has a reduced number of components, reducing the cost of manufacture and assembly of the relief valve.
- the adjustment of the relief valve should be completed during manufacture and the valve designed so that the user can not easily vary this once assembly has been completed. Therefore once the cap 28 has been placed over the cover 19, the spindle 23 is not accessible by a user without first disassembling the valve. Rotation of the cap 28 does not rotate the spindle 23 since it is free to rotate relative to the spindle 23. Washer 32 is provided to allow the rotation of the spindle 23 relative to the jumper 3. The washer 32 also provides the function of distributing the load applied by the spindle 23 over a larger area of the jumper 3. This allows the jumper 3 to be manufactured from less resilient material, in particular, a moulded plastic or resin material. This represents an opportunity for cost saving over the metal alloys typically used in prior art relief valves and the valves.
- the washer 31 allows the spindle 23 to be raised together with the raising of the cap 28.
- ramps 29, 30 are distributed around the perimeter of the cap 28 and cover 1 9 so that when it is rotated, the cap 28 moves upwards, pulling the spindle 23 upwards with it.
- the jumper 3 is therefore also allowed to move upwards, opening the valve to allow fluid to pass from the inlet 2 to the outlet 6.
- the washer 32 (see figure 3) may assist to pull the jumper 3 upwards when the pressure at the inlet 2 is insufficient to push the jumper 3 up.
- rotation of the cap 28 allows the relief valve to be flushed.
- a seal 20 is provided between the wall of the valve body 1 and the jumper 3.
- the seal 20 prevents fluid from traversing from the outlet 6 to contact the compression spring 8 and surrounding components.
- the seal 20 includes an inner peripheral portion 37 and an outer peripheral portion 36 (see Figure 3), both including thickened portions or bosses.
- the seal 20 includes a flexible portion between the inner and outer peripheral portions 37, 36, allowing relative movement between the inner and outer peripheral portions 37, 36.
- the inner peripheral portion of the valve 20 also moves upwards with it at least to a certain extent. This prevents or reduces dragging of the seal 20 along the outer surface of the jumper 3.
- the width of the flexible portion between the inner and outer peripheral portions 37, 36 may be substantially the minimum to allow for movement of the jumper 3 during normal or typical use without the inner peripheral portion 37 sliding along the outer surface of the jumper 3.
- the outer peripheral portion 36 is secured between the valve body 1 and the cover 1 9. Therefore, a single seal 20 provides the dual function of preventing fluid from traversing up the outer periphery of the jumper 3 and also seals against fluids escaping from the valve through the gap between the valve body 1 and cover 1 9.
- the inner portion 37 of the seal 20 has a substantially annular cross-section, wherein the outer portion 36 has a substantially U-shaped cross-section as shown in Figure 3.
- the inner peripheral portion 37 may be secured to the jumper 3, with the outer peripheral portion frictionally engaging with the inner wall of the valve body 1 .
- the relief valve may also include a temperature relief function.
- a temperature relief function This is accommodated using a standard temperature probe 9, which contains and expandable material such as wax, which expands at higher temperatures, forcing a pin 10 within the temperature probe to move upwards. If the water temperature exceeds the set point of the probe, the pin 10 touches the bottom of the jumper assembly 4, causing the jumper assembly 4 to lift off the valve seat 5. This allows hot water to travel from the inlet 2 to the outlet 6.
- the probe 9 is supported in the valve by a cantilever 34 that protrudes from the inside wall of the inlet 2.
- the jumper 3, spindle 23, compression spring 8, adjusting nut 24 and cover 1 9 are first assembled and then inserted over the valve body 1 .
- a flange 21 of the valve body 1 is then swaged over so as to engage the cover 1 9.
- the spindle 23 is then rotated to adjust the set pressure of the valve, after which the cap 28 and washer 31 are secured to the spindle 23.
- the jumper 3 includes a number of channels or grooves 25, in this case six, around its inner periphery. These receive corners of the adjusting nut 24, allowing it to linearly move up and down the jumper 3, but not rotate relative to the jumper 3. Protrusions in the forms of fins 17 are provided around the outer periphery of the jumper 3, which are accommodated by corresponding channels or grooves 1 8 in the cover 1 9 to prevent rotational movement of the jumper 3. Therefore, since neither the adjusting nut 24 nor jumper 3 can rotate, the compression spring 8 can also not be rotated due to rotation of the spindle 23.
- a washer 32 is provided to engage with the protrusions 39 in an interlocking manner.
- the lower internal surface 33 of the jumper 3 has a tapered surface to support the washer 32 and distribute the load applied by the spindle 23, allowing less resilient materials to be used to manufacture.
- the lower surface has a substantially conic-shaped vertical section.
- Figure 3 shows an exploded view of a portion of the relief valve.
- the cover 1 9 includes channels or grooves 1 8 to receive the fins 1 7 of the jumper 3.
- Bosses 26 and 27 are provided on the cover 19 and adjusting nut 24 to support the compression spring 8 in place. This prevents the compression spring 8 from moving off axis.
- the jumper 3 rests on the valve seat 5 in the same position each time. This allows the valve seat 5 and seal 1 6 to conform to each others shape, creating a better seal and improving the seal obtained upon reseating.
- Two flats 22 are provided on the spindle 23 to allow for adjustment during assembly of the relief valve.
- a thread 40 is provided to engage with a corresponding thread of the adjustment nut 24 to allow the position of the adjustment nut 24 to be varied by rotating the spindle 23.
- the adjusting nut 24 includes six faces 35, the corners of which are received by the channels or grooves 25 of the jumper 3 to guide its movement along the spindle 23 and prevent rotational movement.
- a pressure temperature relief valve having features including a jumper that is integrally formed, which has a moveable seal around the periphery of the jumper, allows adjustment of the valve without rotation of the spring and allows flushing of the valve without applying excess pressure to the jumper.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ524627A NZ524627A (en) | 2000-09-22 | 2001-09-21 | Relief valve |
AU2001290384A AU2001290384B2 (en) | 2000-09-22 | 2001-09-21 | Relief valve |
AU9038401A AU9038401A (en) | 2000-09-22 | 2001-09-21 | Relief valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ507125 | 2000-09-22 | ||
NZ50712500 | 2000-09-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002025150A1 true WO2002025150A1 (en) | 2002-03-28 |
Family
ID=19928122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NZ2001/000196 WO2002025150A1 (en) | 2000-09-22 | 2001-09-21 | Relief valve |
Country Status (2)
Country | Link |
---|---|
AU (2) | AU9038401A (en) |
WO (1) | WO2002025150A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2388648A (en) * | 2002-03-22 | 2003-11-19 | Seetru Ltd | Attaching an elastomeric seal to a valve closure member |
US9476599B2 (en) | 2013-08-04 | 2016-10-25 | Triteck Limited | Hot water storage unit, relief device and method of making a hot water storage unit |
DE102015120511A1 (en) * | 2015-11-26 | 2017-06-01 | Schell Gmbh & Co. Kg | angle valve |
WO2017214685A1 (en) * | 2016-06-17 | 2017-12-21 | Australian Valve Group Pty Ltd | A freeze prevention valve |
DE102011075043B4 (en) | 2011-05-02 | 2023-04-13 | Schaeffler Technologies AG & Co. KG | Seal for switching valves |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1532215A (en) * | 1974-11-16 | 1978-11-15 | Lucas Electrical Ltd | Pressure regulating valve |
EP0096616A1 (en) * | 1982-06-09 | 1983-12-21 | Robinetterie, S.F.R., S.A. | Valve to be mounted in a housing |
GB2196722A (en) * | 1986-09-16 | 1988-05-05 | Drum Eng Co Ltd | Relief valve |
US4799506A (en) * | 1987-05-20 | 1989-01-24 | Taylor Wesley L | Adjustable safety relief valve |
WO1994027071A1 (en) * | 1993-05-18 | 1994-11-24 | Flamco B.V. | Valve |
-
2001
- 2001-09-21 WO PCT/NZ2001/000196 patent/WO2002025150A1/en active IP Right Grant
- 2001-09-21 AU AU9038401A patent/AU9038401A/en active Pending
- 2001-09-21 AU AU2001290384A patent/AU2001290384B2/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1532215A (en) * | 1974-11-16 | 1978-11-15 | Lucas Electrical Ltd | Pressure regulating valve |
EP0096616A1 (en) * | 1982-06-09 | 1983-12-21 | Robinetterie, S.F.R., S.A. | Valve to be mounted in a housing |
GB2196722A (en) * | 1986-09-16 | 1988-05-05 | Drum Eng Co Ltd | Relief valve |
US4799506A (en) * | 1987-05-20 | 1989-01-24 | Taylor Wesley L | Adjustable safety relief valve |
WO1994027071A1 (en) * | 1993-05-18 | 1994-11-24 | Flamco B.V. | Valve |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2388648A (en) * | 2002-03-22 | 2003-11-19 | Seetru Ltd | Attaching an elastomeric seal to a valve closure member |
GB2388648B (en) * | 2002-03-22 | 2005-07-06 | Seetru Ltd | Improvements in or relating to valve sealing ararngements |
DE102011075043B4 (en) | 2011-05-02 | 2023-04-13 | Schaeffler Technologies AG & Co. KG | Seal for switching valves |
US9476599B2 (en) | 2013-08-04 | 2016-10-25 | Triteck Limited | Hot water storage unit, relief device and method of making a hot water storage unit |
DE102015120511A1 (en) * | 2015-11-26 | 2017-06-01 | Schell Gmbh & Co. Kg | angle valve |
WO2017214685A1 (en) * | 2016-06-17 | 2017-12-21 | Australian Valve Group Pty Ltd | A freeze prevention valve |
US10823304B2 (en) | 2016-06-17 | 2020-11-03 | Triteck Limited | Freeze prevention valve |
Also Published As
Publication number | Publication date |
---|---|
AU9038401A (en) | 2002-04-02 |
AU2001290384B2 (en) | 2006-06-01 |
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