GB2042129A - Pressure-operated valve - Google Patents
Pressure-operated valve Download PDFInfo
- Publication number
- GB2042129A GB2042129A GB7904781A GB7904781A GB2042129A GB 2042129 A GB2042129 A GB 2042129A GB 7904781 A GB7904781 A GB 7904781A GB 7904781 A GB7904781 A GB 7904781A GB 2042129 A GB2042129 A GB 2042129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- housing
- valve portion
- valve seat
- compression spring
- 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.)
- Withdrawn
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
- F16K17/20—Excess-flow valves
-
- 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
- F16K11/044—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with movable valve members positioned between valve seats
-
- 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
- F16K47/00—Means in valves for absorbing fluid energy
Abstract
The valve has a housing in which there is at least one fixed annular valve seat 6 and two fixed tubular guides 7. A valve member is movable within the housing and includes a central enlarged valve portion 9 for co-operation with the valve seat(s) and two stems 10 extending in opposite directions from the valve portion and slidable in the respective tubular guides. In the form shown there are two annular valve seats, one on each side of the valve portion 9 and each tubular guide constitutes a dashpot and houses a compression spring 13. In another form there is a single valve seat, a single dashpot and a single compression spring. <IMAGE>
Description
SPECIFICATION
Liquid pressure-operated valve
This invention relates to liquid pressure-operated valves.
According to the invention there is provided a liquid pressure-operated valve comprising a housing having therein a fixed annular valve seat about an axis of the housing and two fixed tubular guides spaced apart along the axis of the housing, and a valve member movable within and axially of the housing, the valve member including a central enlarged valve portion for co-operating with the valve seat and two stems extending axially in opposite directions from the valve portion and slidably received in the respective tubular guides, one tubular guide on the same side of the valve portion as the valve seat also constituting a dashpot for slowing movement of the valve portion towards the valve seat and the other tubular guide housing a compression spring urging the valve portion towards the valve seat.
The valve may be in the form of an emergency two-way shut-off valve in which there are two annular valve seats about the axis of the housing and spaced apart along the axis, one on each side of the valve portion, and each tubular guide constitutes a dashpot and houses a compression spring such that the valve portion is urged towards a central position between and spaced from both valve seats.
Thus, in the event of a pipeline failure downstream of the installed valve, the loss of back pressure on the downstream side of the valve portion causes a sufficient pressure differential to be set up across the valve portion to result in the valve portion moving in a downstream direction into contact with the downstream valve seat and thus block-off liquid forward flow through the valve. Conversely in the event of a pipeline failure upstream of the installed valve, the loss of forward pressure on the upstream side of the valve portion causes a sufficient pressure differential to be set up across the valve portion to result in the valve portion moving in an upstream direction into contact with the upstream valve seat and thus block-off liquid back flow through the valve.In either event one or the other of the dashpots slows the movement of the valve portion into contact with a valve seat so that the blocking-off of liquid is preceded by a gradual restricting of liquid flow so as to avoid shocks in the pipeline.
The valve may also be in the form of a check valve in which there is a single valve seat, a single dashpot and a single compression spring.
In this case, the valve is installed in a pipeline in such a manner that the valve portion is downstream of the single valve seat. In the event of a reversal in the direction of liquid flow the valve portion moves slowly into contact with the single valve seat with the aid of the single compression spring and under the control of the single dashpot so as to avoid shocks in the pipeline.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is an axial section through an emergency two-way shut off valve;
Figure2 is a cross section on line Il-Il in Figure 1; and
Figure 3 is an axial section through a check valve.
Referring to Figures 1 and 2, an emergency two-way shut-off valve comprises a housing formed in two portions 1 and 2 each having at their mating ends annular flanges 3, 4. The flange 3 is externally screw-threaded to receive an internally screwthreaded and stepped collar 5 by means of which the portions 1 and 2 are held together. Each portion 1,2 has therein a fixed annular valve seat 6 about an axis of the assembled housing and two fixed tubular guides 7 spaced apart along such axis, the tubular guides 7 being mounted by means of radiating webs 8. A valve member is movable within and axially of the assembled housing and includes a central enlarged double-conical valve portion 9 for cooperation with the valve seals 6 and two stems 10 extending axially in opposite directions from the valve portion 9 and slidably received in the respective tubular guides 7.Each tubular guide 7 constitutes a dashpot having a restricted end opening 11 and an axially opening 12, the dashpot using the liquid passing through the valve in use. Each tubular guide 7 also houses a compression spring 13 such that the valve portion 9 is urged towards a central position between and spaced from both valve seats 6 as shown in Figure 1. Beyond the webs 8 both housing portions 1,2 narrow in diameter at 14to externally screw-threaded end connection 15 for coupling the valve into a pipeline.
Under normal operating conditions the valve portion 9 is spaced apart from both valve seats 6, the liquid pressure positioning the valve portion 9 somewhat closer to the downstream valve seat 6 than the upstream one. In the event of a pipe failure downstream of the valve, the back pressure downstream of the valve will fall and this fall in back pressure will create across the valve portion 9 a pressure differential sufficient to move the valve portion 9 into contact with the downstream valve seat 6 and thus block-off liquid forward flow through the valve.In the event of a pipe failure upstream of the valve, the forward pressure upstream of the valve will fall and this fall in forward pressure will create across the valve portion 9 a pressure differential sufficient to move the valve portion 9 into contact with the upstream valve seat 6 and thus block-off back flow through the valve. In either event one or the other of the dashpots slows the movement of the valve portion 9 into contact with a valve seat 6 so that blocking-off of liquid flow is preceded by a gradual restricting of liquid flow so as to avoid shocks in the pipeline.
Referring to Figure 3, a check valve is similar to the valve shown in Figures 1 and 2 except that one of the valve seats 6 is omitted, only the tubular guide 7 on the same side of the valve portion 9 as the single valve seat 6 constitutes a dash pot and only the other tubular guide 7 houses a compression spring 13.
Normal operating conditions are such that the valve portion 9 is downstream of the single valve seat 6 and spaced therefrom by the liquid pressure.
If, however, there is a reversal in the direction of flow, the valve portion 9 moves slowly into contact with the single valve seat 6 with the aid of the single compression spring 13 and under the control of the single dashpot so as to avoid shocks in the pipeline.
The valve portion 9 as shown is of double-conical shape so as to minimise turbulence. It could however be any solid of revolution, e.g. a plain disc.
Furthermore, particularly in the case of larger valves the flanges 3 and 4 could have proportionally larger radial dimensions than as shown and be bolted together instead of being held together by the collar 5.
Claims (6)
1. Afluid pressure-operating valve comprising a housing having therein a fixed annular valve seat about an axis of the housing and two fixed tubular guides spaced apart along the axis of the housing, and a valve member movable with in and axially of the housing, the valve member including a central enlarged valve portion for co-operation with the valve seat and two stems extending axially in opposite directions from the valve portion and slidably received in the respective tubular guides, one tubular guide on the same side of the valve portion as the valve seat also constituting a dash pot for slowing movement of the valve portion towards the valve seat and the other tubular guide housing a compression spring urging the valve portion towards the valve seat.
2. Afluid pressure-operated valve according to claim 1, in the form of an emergency two-way shut-off valve in which there are two annular valve seats about the axis of the housing and spaced apart along the axis, one on each side of the valve portion, and each tubular guide constitutes a dashpot and houses a compression spring such that the valve portion is urged towards a central position between and spaced from both valve seats.
3. A fluid pressure-operated valve according to claim 1, in the form of a check valve in which there is a single valve seat, a single dashpot and a single compression spring.
4. A fluid pressure-operated valve according to claim 1, 2 or 3, wherein the central enlarged valve portion is double-conical in shape.
5. A fluid pressure-operated valve substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawing.
6. Afluid pressure-operated valve substantially as hereinbefore described with reference to Figures 2 and 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7904781A GB2042129A (en) | 1979-02-10 | 1979-02-10 | Pressure-operated valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7904781A GB2042129A (en) | 1979-02-10 | 1979-02-10 | Pressure-operated valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2042129A true GB2042129A (en) | 1980-09-17 |
Family
ID=10503123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7904781A Withdrawn GB2042129A (en) | 1979-02-10 | 1979-02-10 | Pressure-operated valve |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2042129A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2233069A (en) * | 1989-05-30 | 1991-01-02 | Walbro Corp | Check valve for engine fuel delivery systems |
| EP0450535A1 (en) * | 1990-04-06 | 1991-10-09 | Kwc Ag | Self-reset diverter valve |
| DE19716471A1 (en) * | 1997-04-19 | 1998-10-22 | Rexroth Mannesmann Gmbh | Back-flow prevention valve |
| CN100365334C (en) * | 2004-03-16 | 2008-01-30 | 曹建钢 | Plane sealed 3-way valve |
| CN102878324A (en) * | 2012-10-23 | 2013-01-16 | 曼瑞德自控系统（乐清）有限公司 | Water mixing device for floor heating |
| DE102013208146A1 (en) * | 2013-05-03 | 2014-11-20 | Hansgrohe Se | Motion damping element and thus equipped telescopic pipe |
| US11230980B2 (en) * | 2018-03-16 | 2022-01-25 | Rolls-Royce Plc | Fault-accommodating flow scheduling valve |
-
1979
- 1979-02-10 GB GB7904781A patent/GB2042129A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2233069A (en) * | 1989-05-30 | 1991-01-02 | Walbro Corp | Check valve for engine fuel delivery systems |
| EP0450535A1 (en) * | 1990-04-06 | 1991-10-09 | Kwc Ag | Self-reset diverter valve |
| US5069241A (en) * | 1990-04-06 | 1991-12-03 | Kwc Ag | Change-over valve with automatic resetting |
| DE19716471A1 (en) * | 1997-04-19 | 1998-10-22 | Rexroth Mannesmann Gmbh | Back-flow prevention valve |
| DE19716471B4 (en) * | 1997-04-19 | 2007-08-02 | Bosch Rexroth Aktiengesellschaft | Check valve for placement between a SAE compliant pad of a control block and an SAE mounting flange |
| CN100365334C (en) * | 2004-03-16 | 2008-01-30 | 曹建钢 | Plane sealed 3-way valve |
| CN102878324A (en) * | 2012-10-23 | 2013-01-16 | 曼瑞德自控系统（乐清）有限公司 | Water mixing device for floor heating |
| CN102878324B (en) * | 2012-10-23 | 2014-04-16 | 曼瑞德自控系统（乐清）有限公司 | Water mixing device for floor heating |
| DE102013208146A1 (en) * | 2013-05-03 | 2014-11-20 | Hansgrohe Se | Motion damping element and thus equipped telescopic pipe |
| US11230980B2 (en) * | 2018-03-16 | 2022-01-25 | Rolls-Royce Plc | Fault-accommodating flow scheduling valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |