CA2077281C - Valve controlled in dependence on differential pressure - Google Patents
Valve controlled in dependence on differential pressureInfo
- Publication number
- CA2077281C CA2077281C CA 2077281 CA2077281A CA2077281C CA 2077281 C CA2077281 C CA 2077281C CA 2077281 CA2077281 CA 2077281 CA 2077281 A CA2077281 A CA 2077281A CA 2077281 C CA2077281 C CA 2077281C
- Authority
- CA
- Canada
- Prior art keywords
- valve
- diaphragm
- insert
- articulation
- housing
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
- G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
- G05D16/0661—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane characterised by the loading mechanisms of the membrane
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
A valve controlled in dependence on differential pressure comprises a valve housing (4), a diaphragm housing (16) fastened thereto, and connected therewith a setting device (3) with a set-point spring (50). Fastened in the centre of the diaphragm (23) there is an insert (26) against which an end contact face (28) of the valve rod (7) lies. The insert (26) is connected by way of an articulation (37) to a pin (36) which projects into the setting device (3) and is there loaded by the set-point spring (50). In that manner, the valve movement is prevented from being obstructed by the influence of transverse forces.
Description
20772g 1 The invention relates to a valve controlled in dependence on differential pressure having a valve housing, which comprises a valve seat and a closure member provided with a valve rod, with a diaphragm housing, which is mounted on the valve housing and is divided by a diaphragm acting on the valve rod into two pressure chambers, and with a setting device, which is mounted on the diaphragm housing and comprises a set-point spring acting on the diaphragm and an adjusting means for the desired value spring.
In the case of a known valve of this kind (EP-OS 354 427), use 10is made of a continuous valve rod, which joins together the closure member, the diaphragm, and a spring plate loaded by the set-point spring, and with a free end is mounted close to the closure member in a guide of the valve housing. Transverse forces, which are transferred in the region of the setting device and/or in the region of the diaphragm to the valve rod, for example, because of unsymmetrical spring forces (skewed state), lead to undesirable friction stress in the sealed feed-through of the valve housing and thus to hysteresis in the valve movement and to excessive wear and tear.
20The invention is based on the problem of providing a valve of the kind mentioned in the introduction, the valve rod of which is readily accessible and is movable such that wear and tear is low.
Generally speaking, the problems of the prior art are overcome by the present invention which provides a valve controlled in dependence on differential pressure comprising: a valve housing having a valve seat and a closure member provided with a valve rod;
a diaphragm housing mounted on the valve housing and divided into two pressure chambers by a diaphragm acting on the valve rod; a setting device mounted on the diaphragm housing including a 30set-point spring acting on the diaphragm and an adjusting means for the set-point spring; and an insert fastened in the centre of the diaphragm against which an end contact face of the valve rod lies under the bias of a valve spring; the insert being connected by way of an articulation to a pin which projects into the setting device and is there loaded by the set-point spring.
In that construction, the diaphragm is in contact by way of a first coupling point, which is located between the insert and the contact face, with the valve rod and by way of a second coupling point, which is formed by the articulation, in contact with the pin leading to the setting device. If the diaphragm arrangement is set at an angle owing to structural asymmetries or unequal spring forces, then the insert is able to pivot about the articulation and move transversely with respect to the contact face of the valve rod. No transverse forces are therefore transferred to the valve rod. As a consequence, the valve rod moves easily with very low hysteresis and negligible wear and tear.
It is advantageous for the pin to project out of the diaphragm housing in a sealed manner, and for the setting device to be removable as a unit from the diaphragm housing. The fact that the pin is sealed enables the set-point spring to be located in the atmosphere; it can therefore be adjusted at any time or be replaced by exchanging the setting device. Because of the articulation, the seal for the pin is at the most very slightly stressed by transverse forces stemming from the diaphragm, and therefore does not hinder the easy actuation.
An especially simple construction is obtained if the insert is fastened to two supporting plates covering the diaphragm on both sides. This arrangement can be effected such that the insert has a circumferential wall which passes through a central - 3 _ 2077281 opening in the supporting plates and is fixed there by crimping. Joining the insert to the supporting plates ensures that even a comparatively small insert is securely joined to the diaphragm.
It is an advantage for the articulation to be formed by an articulation head, which is fastened to the pin by way of a neck, and by an articulation socket in the insert engaging behind the articulation head.
That arrangement takes into account the fact that in ordinary constructions of a valve controlled by differential pressure, in which the higher pressure is found in the pressure chamber remote from the valve, the desired value springs act on the diaphragm with tensile forces, and the articulation must therefore transfer tensile forces.
According to a preferred construction, the articulation head has a surface that is at least partially spherical and the articulation socket is formed by a transverse bore adjoining which is a slot for receiving the neck. That facilitates the assembly of insert and pin.
In that case, a cap that is lockable in the axial direction and which engages over the insert in the region of the transverse bore can be provided on the pin. A light-weight plastics cap is adequate, because the forces to be absorbed are not large.
In a further development, it is advisable to house a relief valve in the insert, which joins the pressure chamber charged with a higher pressure with the pressure chamber charged with a lower pressure when a given pressure difference is exceeded. A relief valve between the two pressure chambers is known ~E se. In the present case it is provided in the insert in a space-saving manner and so that it is easy to manufacture.
In particular, connected to its transverse bore the insert may have an axial bore against the free end of which a valve ball is held by a spring.
The invention is explained in detail hereinafter with reference to a preferred embodiment illustrated in the drawing. The single Figure shows a longitudinal section through a valve according to the invention.
The valve illustrated consists of three parts fastened to one another, namely, a valve unit 1, a fit-on diaphragm unit 2 and a setting device 3.
The valve unit 1 comprises a valve housing 4 with a valve seat 5. The latter co-operates with a closure member 6 which is connected to a valve rod 7. The closure member is arranged to be screwed onto a threaded portion 8 of the valve rod 7 and clamps the base of a cup 9 drawn from sheet metal fixedly to a step in the valve rod 7. An insert 10 in the housing 4 forming a passage-way has a guide section 11 for the valve rod 7 and a seal 12 for the cup 9. This creates a compensation chamber 13 which is connected by way of a system of ducts 14 in the closure member 6 and in the valve rod 7 to the inlet chamber 15 of the valve housing 4. Static pressure compensation at the closure member is obtained in this way.
The fit-on diaphragm unit 2 has a diaphragm housing 16 with a lower shell 17 and an upper shell 18 connected to the lower shell by crimping. A fixing ring 19, which can be fastened to the valve housing 4 by means of a union nut 20, is secured to the lower shell 17-by crimping. A sealing housing 21 acting as a packing gland is secured to the upper shell 18 by crimping and has a profiling 22 in the form of a circumferential annular groove with conical side walls.
A diaphragm 23 is clamped peripherally between the shells 17 and 18 and is covered on both sides by supporting plates 24 and 25. An insert 26 has a circumferential wall 27 which passes through a central opening in the supporting plates 24, 25 and is fixed there by crimping. At its upper end the valve rod 7 carries a contact face 28 formed by a plate, which is pressed with the aid of a valve spring 29 against the insert 26.
The diaphragm 23 divides the diaphragm housing 16 into a pressure chamber 30 close to the valve and a pressure chamber 31 remote from the valve. The pressure chamber 30 is connected by way of a bore 32 to the compensation chamber 13, and thus to the inlet chamber 15 of the valve housing 4. The pressure chamber 31 has a connection 33 for a pulse line, by which a system pressure to be monitored, which is generally higher than the pressure in the pressure chamber 30, can be supplied. In the pressure chamber 30 there is a diaphragm spring 34 which urges the diaphragm 23 upwards, and in the pressure chamber 31 there is a diaphragm spring 35 which urges the diaphragm 23 downwards. A guided pin 36 is connected at its lower end by way of an articulation 37 to the insert 26. The pin projects through the sealing housing 21 to the outside. The articulation 37 comprises a hemi-spherical head 38, which is connected to the pin 36 by a neck 39, and an articulation socket 40, which engages behind the articulation head 38. The articulation socket is formed by a transverse bore 41, the axis of which is at right-angles to the plane of the drawing and adjoining the upper side of which is a slot 42 running in the same direction for the passage of the neck 39. On assembly, the articulation head 38 is pushed from the side into the transverse bore 41 and is held in the middle of the bore by a pushed-on cap 43 so that it is able to perform a limited swivel movement in all directions.
A relief valve 44 is provided in the insert 26 and comprises a valve ball 45 which is pressed by a spring 46 against the free end of an axial bore 47 connected to the transverse bore 41.
The setting device 3 comprises an annular base 48, which is arranged to be pushed onto the sealing housing 21 and is to be fastened to the diaphragm housing 16 with the help of screws 49 that engage with cone points in the annular groove 22. A set-point spring 50 in the form of a helical compression spring extends coaxially with the pin 36 between a supporting plate 51 close to the diaphragm and a spring plate 52 remote from the diaphragm. The supporting plate 51 is prevented from rotating by a guide member 53 and has an external thread 54 which engages with a corresponding internal thread on the circumferential wall 55 of a rotary knob 56.
At its lower end, the rotary knob 56 has resilient tongues 57 which engage by means of projections 58 beneath a step of the base 48.
The rotary knob 56 is therefore capable of rotation, but is axially fixed. Mounted on the supporting plate 51 is an index ring 59 which projects with radial pointers 60 through two axial slots 61 in the knob 56 and cooperates with a marking on the outside of the knob.
The spring plate 52 is joined by way of a conical wall 62 to a tubular extension 63 which extends towards the fit-on diaphragm unit 2 and there forms with the pin 36 a coupling 64, in particular a snap-fit coupling. For that purpose, the pin 36 has a head 65 which is provided at its top end with a sloping face 66. This co-operates with a holder 67, which likewise has sloping faces 68, engaging behind it. The holder is constructed on resilient arms 69 which are created by axially parallel slots 70 in the tubular extension 63. The slots 70 extend into the conical wall 62 so that, by introducing a tool through an end opening 71 in the rotary knob 56, the spring arms 69 can be spread apart at the transition from the extension 63 to the conical wall 62, and the coupling 64 can thereby be released.
Assuming that the illustrated valve is intended to keep the pressure drop constant in a system, for instance in a hot water heating system, then the valve is arranged at the exit of the system, that is to say, in the return line, and the connection 33 ~3 .~
is connected to the supply line. The lower pressure chamber 30 then carries the return pressure and the upper pressure chamber 31 carries the supply pressure. This produces a force acting in the closing direction. Counteracting this is the force of the desired value spring 50 which is effective as a tensile force in the region of the articulation 37 and the coupling 64. In the usual manner, a state of equilibrium is established, in which the pressure drop in the system has the desired value.
The set-point spring can be adjusted at any time by rotating the rotary knob 56. If it is desired to use a different spring assembly, the setting device 3 can simply be exchanged as a unit.
Using a tool which has a smaller angle of taper than the conical wall 62, the spring arms 69 are opened out so that the coupling 64 is released. On renewed assembly, the coupling 64 snaps on automatically by virtue of the sloping faces 66 and 68. Should the force of the set-point spring 50 be too great, it is sufficient to press the spring plate 52 downwards somewhat; that can be effected without difficulty through the opening 71.
The play and the articulation mobility of the coupling 64 prevents transverse forces, which may occur on account of asymmetry of the desired value spring 50 on the spring plate 52, from being transferred to the pin 36 to an intrusive degree. The same applies in respect of the articulation 37 too, if the diaphragm 23 should be positioned askew. The pin 36 can therefore be guided with low friction, and so that it is easily movable, right through the sealing housing 21.
Transverse forces cannot be transmitted from the diaphragm to the valve rod 7 either, because the valve rod 7 is separated from the insert 26, and only compressive forces can be transmitted. As a consequence, there is no need to fear undesirable friction at the seal 12, which would obstruct the mobility of the valve and cause undesirable wear and tear.
In heating systems, it may happen that by shutting off all loads the return pressure will drop in the pressure chamber 30 on account of cooling of the water and the contraction associated therewith, while the supply pressure in the pressure chamber 31 corresponds to the normal system pressure, for example 5 bar. So that thick and sluggish diaphragms do not have to be used, the relief valve 44 is provided, which opens under the said circumstances and effects a partial pressure equalisation between the two pressure chambers 30 and 31.
In the case of a known valve of this kind (EP-OS 354 427), use 10is made of a continuous valve rod, which joins together the closure member, the diaphragm, and a spring plate loaded by the set-point spring, and with a free end is mounted close to the closure member in a guide of the valve housing. Transverse forces, which are transferred in the region of the setting device and/or in the region of the diaphragm to the valve rod, for example, because of unsymmetrical spring forces (skewed state), lead to undesirable friction stress in the sealed feed-through of the valve housing and thus to hysteresis in the valve movement and to excessive wear and tear.
20The invention is based on the problem of providing a valve of the kind mentioned in the introduction, the valve rod of which is readily accessible and is movable such that wear and tear is low.
Generally speaking, the problems of the prior art are overcome by the present invention which provides a valve controlled in dependence on differential pressure comprising: a valve housing having a valve seat and a closure member provided with a valve rod;
a diaphragm housing mounted on the valve housing and divided into two pressure chambers by a diaphragm acting on the valve rod; a setting device mounted on the diaphragm housing including a 30set-point spring acting on the diaphragm and an adjusting means for the set-point spring; and an insert fastened in the centre of the diaphragm against which an end contact face of the valve rod lies under the bias of a valve spring; the insert being connected by way of an articulation to a pin which projects into the setting device and is there loaded by the set-point spring.
In that construction, the diaphragm is in contact by way of a first coupling point, which is located between the insert and the contact face, with the valve rod and by way of a second coupling point, which is formed by the articulation, in contact with the pin leading to the setting device. If the diaphragm arrangement is set at an angle owing to structural asymmetries or unequal spring forces, then the insert is able to pivot about the articulation and move transversely with respect to the contact face of the valve rod. No transverse forces are therefore transferred to the valve rod. As a consequence, the valve rod moves easily with very low hysteresis and negligible wear and tear.
It is advantageous for the pin to project out of the diaphragm housing in a sealed manner, and for the setting device to be removable as a unit from the diaphragm housing. The fact that the pin is sealed enables the set-point spring to be located in the atmosphere; it can therefore be adjusted at any time or be replaced by exchanging the setting device. Because of the articulation, the seal for the pin is at the most very slightly stressed by transverse forces stemming from the diaphragm, and therefore does not hinder the easy actuation.
An especially simple construction is obtained if the insert is fastened to two supporting plates covering the diaphragm on both sides. This arrangement can be effected such that the insert has a circumferential wall which passes through a central - 3 _ 2077281 opening in the supporting plates and is fixed there by crimping. Joining the insert to the supporting plates ensures that even a comparatively small insert is securely joined to the diaphragm.
It is an advantage for the articulation to be formed by an articulation head, which is fastened to the pin by way of a neck, and by an articulation socket in the insert engaging behind the articulation head.
That arrangement takes into account the fact that in ordinary constructions of a valve controlled by differential pressure, in which the higher pressure is found in the pressure chamber remote from the valve, the desired value springs act on the diaphragm with tensile forces, and the articulation must therefore transfer tensile forces.
According to a preferred construction, the articulation head has a surface that is at least partially spherical and the articulation socket is formed by a transverse bore adjoining which is a slot for receiving the neck. That facilitates the assembly of insert and pin.
In that case, a cap that is lockable in the axial direction and which engages over the insert in the region of the transverse bore can be provided on the pin. A light-weight plastics cap is adequate, because the forces to be absorbed are not large.
In a further development, it is advisable to house a relief valve in the insert, which joins the pressure chamber charged with a higher pressure with the pressure chamber charged with a lower pressure when a given pressure difference is exceeded. A relief valve between the two pressure chambers is known ~E se. In the present case it is provided in the insert in a space-saving manner and so that it is easy to manufacture.
In particular, connected to its transverse bore the insert may have an axial bore against the free end of which a valve ball is held by a spring.
The invention is explained in detail hereinafter with reference to a preferred embodiment illustrated in the drawing. The single Figure shows a longitudinal section through a valve according to the invention.
The valve illustrated consists of three parts fastened to one another, namely, a valve unit 1, a fit-on diaphragm unit 2 and a setting device 3.
The valve unit 1 comprises a valve housing 4 with a valve seat 5. The latter co-operates with a closure member 6 which is connected to a valve rod 7. The closure member is arranged to be screwed onto a threaded portion 8 of the valve rod 7 and clamps the base of a cup 9 drawn from sheet metal fixedly to a step in the valve rod 7. An insert 10 in the housing 4 forming a passage-way has a guide section 11 for the valve rod 7 and a seal 12 for the cup 9. This creates a compensation chamber 13 which is connected by way of a system of ducts 14 in the closure member 6 and in the valve rod 7 to the inlet chamber 15 of the valve housing 4. Static pressure compensation at the closure member is obtained in this way.
The fit-on diaphragm unit 2 has a diaphragm housing 16 with a lower shell 17 and an upper shell 18 connected to the lower shell by crimping. A fixing ring 19, which can be fastened to the valve housing 4 by means of a union nut 20, is secured to the lower shell 17-by crimping. A sealing housing 21 acting as a packing gland is secured to the upper shell 18 by crimping and has a profiling 22 in the form of a circumferential annular groove with conical side walls.
A diaphragm 23 is clamped peripherally between the shells 17 and 18 and is covered on both sides by supporting plates 24 and 25. An insert 26 has a circumferential wall 27 which passes through a central opening in the supporting plates 24, 25 and is fixed there by crimping. At its upper end the valve rod 7 carries a contact face 28 formed by a plate, which is pressed with the aid of a valve spring 29 against the insert 26.
The diaphragm 23 divides the diaphragm housing 16 into a pressure chamber 30 close to the valve and a pressure chamber 31 remote from the valve. The pressure chamber 30 is connected by way of a bore 32 to the compensation chamber 13, and thus to the inlet chamber 15 of the valve housing 4. The pressure chamber 31 has a connection 33 for a pulse line, by which a system pressure to be monitored, which is generally higher than the pressure in the pressure chamber 30, can be supplied. In the pressure chamber 30 there is a diaphragm spring 34 which urges the diaphragm 23 upwards, and in the pressure chamber 31 there is a diaphragm spring 35 which urges the diaphragm 23 downwards. A guided pin 36 is connected at its lower end by way of an articulation 37 to the insert 26. The pin projects through the sealing housing 21 to the outside. The articulation 37 comprises a hemi-spherical head 38, which is connected to the pin 36 by a neck 39, and an articulation socket 40, which engages behind the articulation head 38. The articulation socket is formed by a transverse bore 41, the axis of which is at right-angles to the plane of the drawing and adjoining the upper side of which is a slot 42 running in the same direction for the passage of the neck 39. On assembly, the articulation head 38 is pushed from the side into the transverse bore 41 and is held in the middle of the bore by a pushed-on cap 43 so that it is able to perform a limited swivel movement in all directions.
A relief valve 44 is provided in the insert 26 and comprises a valve ball 45 which is pressed by a spring 46 against the free end of an axial bore 47 connected to the transverse bore 41.
The setting device 3 comprises an annular base 48, which is arranged to be pushed onto the sealing housing 21 and is to be fastened to the diaphragm housing 16 with the help of screws 49 that engage with cone points in the annular groove 22. A set-point spring 50 in the form of a helical compression spring extends coaxially with the pin 36 between a supporting plate 51 close to the diaphragm and a spring plate 52 remote from the diaphragm. The supporting plate 51 is prevented from rotating by a guide member 53 and has an external thread 54 which engages with a corresponding internal thread on the circumferential wall 55 of a rotary knob 56.
At its lower end, the rotary knob 56 has resilient tongues 57 which engage by means of projections 58 beneath a step of the base 48.
The rotary knob 56 is therefore capable of rotation, but is axially fixed. Mounted on the supporting plate 51 is an index ring 59 which projects with radial pointers 60 through two axial slots 61 in the knob 56 and cooperates with a marking on the outside of the knob.
The spring plate 52 is joined by way of a conical wall 62 to a tubular extension 63 which extends towards the fit-on diaphragm unit 2 and there forms with the pin 36 a coupling 64, in particular a snap-fit coupling. For that purpose, the pin 36 has a head 65 which is provided at its top end with a sloping face 66. This co-operates with a holder 67, which likewise has sloping faces 68, engaging behind it. The holder is constructed on resilient arms 69 which are created by axially parallel slots 70 in the tubular extension 63. The slots 70 extend into the conical wall 62 so that, by introducing a tool through an end opening 71 in the rotary knob 56, the spring arms 69 can be spread apart at the transition from the extension 63 to the conical wall 62, and the coupling 64 can thereby be released.
Assuming that the illustrated valve is intended to keep the pressure drop constant in a system, for instance in a hot water heating system, then the valve is arranged at the exit of the system, that is to say, in the return line, and the connection 33 ~3 .~
is connected to the supply line. The lower pressure chamber 30 then carries the return pressure and the upper pressure chamber 31 carries the supply pressure. This produces a force acting in the closing direction. Counteracting this is the force of the desired value spring 50 which is effective as a tensile force in the region of the articulation 37 and the coupling 64. In the usual manner, a state of equilibrium is established, in which the pressure drop in the system has the desired value.
The set-point spring can be adjusted at any time by rotating the rotary knob 56. If it is desired to use a different spring assembly, the setting device 3 can simply be exchanged as a unit.
Using a tool which has a smaller angle of taper than the conical wall 62, the spring arms 69 are opened out so that the coupling 64 is released. On renewed assembly, the coupling 64 snaps on automatically by virtue of the sloping faces 66 and 68. Should the force of the set-point spring 50 be too great, it is sufficient to press the spring plate 52 downwards somewhat; that can be effected without difficulty through the opening 71.
The play and the articulation mobility of the coupling 64 prevents transverse forces, which may occur on account of asymmetry of the desired value spring 50 on the spring plate 52, from being transferred to the pin 36 to an intrusive degree. The same applies in respect of the articulation 37 too, if the diaphragm 23 should be positioned askew. The pin 36 can therefore be guided with low friction, and so that it is easily movable, right through the sealing housing 21.
Transverse forces cannot be transmitted from the diaphragm to the valve rod 7 either, because the valve rod 7 is separated from the insert 26, and only compressive forces can be transmitted. As a consequence, there is no need to fear undesirable friction at the seal 12, which would obstruct the mobility of the valve and cause undesirable wear and tear.
In heating systems, it may happen that by shutting off all loads the return pressure will drop in the pressure chamber 30 on account of cooling of the water and the contraction associated therewith, while the supply pressure in the pressure chamber 31 corresponds to the normal system pressure, for example 5 bar. So that thick and sluggish diaphragms do not have to be used, the relief valve 44 is provided, which opens under the said circumstances and effects a partial pressure equalisation between the two pressure chambers 30 and 31.
Claims (9)
1. A valve controlled in dependence on differential pressure comprising: a valve housing having a valve seat and a closure member provided with a valve rod; a diaphragm housing mounted on the valve housing and divided into two pressure chambers by a diaphragm acting on the valve rod; a setting device mounted on the diaphragm housing including a set-point spring acting on the diaphragm and an adjusting means for the set-point spring; and an insert fastened in the centre of the diaphragm against which an end contact face of the valve rod lies under the bias of a valve spring; said insert being connected by way of an articulation to a pin which projects into the setting device and is there loaded by the set-point spring.
2. A valve according to claim 1, wherein said pin projects out of said diaphragm housing in a sealed manner and said setting device is removable as a unit from said diaphragm housing.
3. A valve according to claim 1 or 2, wherein said insert is fastened to two supporting plates covering the diaphragm on both sides thereof.
4. A valve according to claim 3, wherein said insert has a circumferential wall which passes through a central opening in the supporting plates and is fixed thereto by crimping.
5. A valve according to one of claims 1 to 4, wherein said articulation is formed by an articulation head, which is fastened to said pin by way of a neck, and by an articulation socket in said insert engaging behind said articulation head.
6. A valve according to claim 5, wherein said articulation head has a surface that is at least partially spherical and said articulation socket is formed by a transverse bore adjoining which is a slot for receiving said neck.
7. A valve according to claim 6, including a cap that is lockable in the axial direction on said pin and which engages over said insert in the region of said transverse bore.
8. A valve according to one of claims 1 to 7, wherein housed in said insert is a relief valve which joins the pressure chamber charged with a higher pressure with the pressure chamber charged with a lower pressure when a given pressure difference is exceeded.
9. A valve according to claim 6, wherein connected to its transverse bore said insert has an axial bore, against the free end of which a valve ball is held by a spring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4131709.2 | 1991-09-24 | ||
| DE19914131709 DE4131709C1 (en) | 1991-09-24 | 1991-09-24 | Fluid pressure differential controlled valve - has housing with seat and valve rod seal with diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2077281A1 CA2077281A1 (en) | 1993-03-25 |
| CA2077281C true CA2077281C (en) | 1998-05-19 |
Family
ID=6441327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2077281 Expired - Fee Related CA2077281C (en) | 1991-09-24 | 1992-09-01 | Valve controlled in dependence on differential pressure |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA2077281C (en) |
| DE (1) | DE4131709C1 (en) |
| DK (1) | DK173889B1 (en) |
| PL (1) | PL169279B1 (en) |
| RU (1) | RU2070301C1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5394122B2 (en) * | 2009-02-02 | 2014-01-22 | 株式会社ケーヒン | Pressure reducing valve |
| CN101975287A (en) * | 2010-10-15 | 2011-02-16 | 吴相民 | Differential pressure type automatic reversing valve |
| SI3462067T1 (en) * | 2013-09-11 | 2021-02-26 | Danfoss A/S | Differential pressure valve |
| DK178871B1 (en) * | 2015-11-05 | 2017-04-10 | Danfoss As | Valve with detachable regulation unit |
| RU2647008C1 (en) * | 2015-11-05 | 2018-03-13 | Данфосс А/С | Means for valve washing |
| RU170751U1 (en) * | 2016-03-09 | 2017-05-05 | Публичное акционерное общество "Киевское центральное конструкторское бюро арматуростроения" (ПАО "КЦКБА") | Device for excess pressure in the valve cavity |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3669403A (en) * | 1968-03-13 | 1972-06-13 | Bendix Corp | Hydraulic pressure modulator for use in adaptive braking systems |
| DE58904471D1 (en) * | 1988-08-11 | 1993-07-01 | Milan Medvescek | DIFFERENTIAL PRESSURE CONTROL VALVE. |
-
1991
- 1991-09-24 DE DE19914131709 patent/DE4131709C1/en not_active Expired - Lifetime
-
1992
- 1992-09-01 CA CA 2077281 patent/CA2077281C/en not_active Expired - Fee Related
- 1992-09-23 RU SU5052660 patent/RU2070301C1/en active
- 1992-09-24 DK DK118292A patent/DK173889B1/en not_active IP Right Cessation
- 1992-09-24 PL PL29603292A patent/PL169279B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK173889B1 (en) | 2002-01-28 |
| PL169279B1 (en) | 1996-06-28 |
| RU2070301C1 (en) | 1996-12-10 |
| CA2077281A1 (en) | 1993-03-25 |
| DK118292A (en) | 1993-03-25 |
| PL296032A1 (en) | 1993-05-17 |
| DE4131709C1 (en) | 1992-12-10 |
| DK118292D0 (en) | 1992-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |