CA2082584C - Kit of parts for a differential-pressure control valve - Google Patents
Kit of parts for a differential-pressure control valveInfo
- Publication number
- CA2082584C CA2082584C CA002082584A CA2082584A CA2082584C CA 2082584 C CA2082584 C CA 2082584C CA 002082584 A CA002082584 A CA 002082584A CA 2082584 A CA2082584 A CA 2082584A CA 2082584 C CA2082584 C CA 2082584C
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- diaphragm capsule
- valve
- kit
- capsule
- 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
- G05D16/14—Control of fluid pressure with auxiliary non-electric power
- G05D16/16—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
- G05D16/163—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid using membranes within the main valve
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/028—Controlling a pressure difference
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A kit of parts for a differential-pressure control valve comprises a valve housing (4), a first diaphragm capsule (2) and a second diaphragm capsule (3). By suitable configuration of the fixing elements (28, 38, 56, 62) two different arrangements of valve can be achieved using largely the same components.
Description
~0~25 ~ ~
'_ The invention relates to a kit of parts for a differential-pressure control valve. The differential-pressure control valve is intended in particular for use in heating systems having radiators, in which the pressure difference between the inlet line and the return line is to be kept constant for the purpose of uniform supply.
The kit of parts is intended to allow two arrangements of such a differential-pressure valve to be produced using largely the same components. In particular, it is intended that the installer shall be able to select one or other arrangement on site.
Generally speaking, the present invention provides a kit of parts for a differential-pressure control valve, comprising: a valve housing with a valve stem passing, sealed, to the outside and first fixing elements arranged in the region of the outlet point; a first diaphragm capsule, which in a first arrangement is arranged to be mounted on the valve housing and for that purpose has second fixing elements matching the first fixing elements for connection of the capsule to the valve housing, and a diaphragm of the first diaphragm capsule carrying an abutment surface, which in the first arrangement is connected non-positively directly to the valve stem; a top unit, which is connected or is arranged to be connected to the first diaphragm capsule, and has adjustable set-point springs which act in the opening direction of the valve; and a second diaphragm capsule, which in a second arrangement is arranged to be mounted on the valve housing and for that purpose has third fixing elements matching the first fixing elements and which on the opposite side, for the purpose of mounting the first diaphragm capsule in the second arrangement, has fourth fixing elements corresponding to the first fixing elements and has a diaphragm which is displaceably held on a diaphragm stem and by way of a stop member acts together with the stem by means of a non-positive connection to couple the valve stem with the diaphragm of the first diaphragm capsule, whereby the diaphragm stem in the second Icd:sg .7.
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arrangement is inserted between the abutment of the diaphragm of the second diaphragm capsule and the valve shaft in a non-positive manner.
Using a valve housing, a first diaphragm capsule and a top unit, a differential-pressure control valve is produced that responds exclusively to the pressure difference on both sides of the diaphragm of the first diaphragm capsule, and in particular therefore to the difference between the inlet pressure and the return pressure. A
differential-pressure control valve of that kind has already been described in copending, commonly owned Canadian Patent Application No. 2,077,280.
The second arrangement is produced from the above-mentioned components and the second diaphragm capsule which, by virtue of the matching fixing elements and the associated diaphragm stem, can be installed very easily between the valve housing and the first diaphragm capsule. With the second diaphragm capsule, the pressure drop at a restrictor can be monitored, as is known (Samson AG "Me~ und Regeltechnik", type sheet T 3017, page 148). This enables the flow rate to be limited in addition to controlling the pressure difference.
In spite of all that, the diaphragm capsules need not be dismantled, but can be used in their entirety as constructional units.
There is also no risk of the diaphragms being damaged during the conversion.
The use of external threads and union nuts results in a very simple and stable connection of the individual components.
A non-positive connection enables the individual components to be connected together easily without special joining means having to be provided between the valve stem, abutment surface and diaphragm stem.
A non-positive connection also allows a free movement of the diaphragm of the second diaphragm capsule during the operation of controlling the pressure difference, and allows this diaphragm to ~cd:sg ..... ~,Q
'~ -exert an influence in the event of a limit value of the flow rate being exceeded.
The guide means keeps the diaphragm stem on its axial movement path, so that despite the non-positive connection it serves as a reliable force-transmitting member.
The construction of the invention enables the adjacent pressure spaces of the first and second diaphragm capsules to be interconnected, so that only one control line connection is required for that purpose.
With the construction of this invention it is also possible to supply the pressure space of the second diaphragm capsule facing towards the valve housing with pressure from a valve chamber, which likewise saves a control line connection.
The loading spring is expedient in many cases for imparting to the diaphragm of the second diaphragm capsule the bias that it requires for its function. A loading spring of this kind can easily be fitted during assembly. All that is required is to support it on the valve housing prior to putting the second diaphragm capsule in posltion .
It is possible to use two half-shells which are joined to one another by crimping, because the diaphragm capsules can be handled complete. The diaphragm is also well protected.
The crimp connections also contribute to the provision of the diaphragm capsules as non-separable components which can be installed without great concentration.
By using an adjustable throttling element in the valve the restrictor is formed, the pressure drop of which serves to actuate the second diaphragm capsule.
The invention is explained in detail hereinafter with reference to a preferred embodiment illustrated in the drawing, in which Icd:sg 5~
-- 3a -Fig. 1 shows a longitudinal section through a first arrangement of a differential-pressure control valve made from the kit of parts according to the invention, Fig. 2 shows a longitudinal section through a second arrangement of a differential-pressure control valve made from the kit of parts according to the invention, Fig. 3 shows an enlarged longitudinal section through the first and the second diaphragm capsule and Fig. 4 shows a diagrammatic circuit diagram for the installation of the second Icd:sg ' ~ f-arrangement of the differential-pressure control valve.
The kit of parts according to the invention comprises essentially four components, namely, a top unit 1, a first diaphragm capsule 2, a second diaphragm capsule 3 and a valve housing 4. For the second arrangement (Fig. 2), all four components are used, for the first arrangement (Fig. 1) the second diaphragm capsule 3 is omitted; the first diaphragm capsule 2 is positioned directly on the valve housing 4. The first arrangement corresponds to the differential-pressure control valve according to Canadian Application 2,077,280; refer to this application for further details.
The top unit 1 has a rotary knob 5 with which a supporting plate 6 for a setpoint spring 7 can be adjusted. This setpoint spring 7 acts by way of an intermediate member 8 with upwardly directed force on a connecting shaft 9 belonging to the first diaphragm capsule 2. Moreover, the top unit 1 has a base 10 with which it can be secured to the first diaphragm capsule 2.
The valve housing 4 has an inlet nipple 11, an outlet nipple 12 and between them a valve seat 13. In a neck portion 14 there is inserted an insert 15 which forms a guide means for a valve stem 16 which also carries a closure member 17. A restrictor 18 is formed by means of a throttling element 19 which is in the form of a cup with an inwardly curved rim, and is vertically adjustable from the outside by means of a screw 20 to change the restrictor cross-section. The valve chamber 21 between the restrictor 18 and the valve seat 13 is in connection, by way of a connecting channel 22, which runs through the closure member 17 and the valve stem 16, and by way of an outlet 23 passing through the insert 15, with the top side of this insert 15. A sheet-metal cup 24 separates this connecting channel from the outlet-side valve chamber. The valve stem 16 carries at its upper end a plate 26 against which a valve spring 27 that loads the closure member 17 sg/vls '~ ' 5 ~ ~
~_ -5-in the opening direction bears. On the outside of the neck portion 14 there is provided a first fixing element 28 in the form of an external thread.
The diaphragm capsule 2 comprises two half-shells 30 and 31 which are joined together at their edge by a crimp 32 which also holds the edge of a diaphragm 33 firmly clamped. The upper half-shell 30 carries a connecting nipple 34 for a control line and a crimp-mounted insert 35, through which the operating shaft 9 passes, sealed, to the outside. The top unit 2 is connected to the diaphragm capsule 2 by interengagement of the base 10 with the insert 35. At the opposite end, a connecting ring 36 is crimped on, and by means of a step 37 holds captive a second fixing element 38 in the form of a union nut. The diaphragm 33 is reinforced by a double plate 39, in the centre of which an insert 40 is mounted by crimping. Connected to the insert by way of a joint 41 is the shaft 9. The insert contains a non-return valve 42 which enables the pressure space 43 below the diaphragm 33 to be connected to the pressure space 44 above this diaphragm when the pressure difference is too great. On the underside of the insert 40 there is provided an abutment surface 45. The diaphragm 33 is loaded by a first spring 46, which is housed in the pressure space 43, and in the opposite direction is loaded by a spring 47, which is housed in the pressure space 44. The spring 46 projects through an open region 48 of the lower half-shell 31 and bears against the second diaphragm capsule 3. The spring 47 bears against the insert 35.
The second diaphragm capsule 3 also comprises two half-shells 50 and 51, which are joined together at their edge by crimping 52 which also grips the edge of the diaphragm 53. The upper half-shell carries a connecting nipple 54 for a control line.
An insert 55 is crimp-mounted on the shell and carries on its outside a fourth fixing element 56 in the form of an external thread identical to first fixing element 28. The insert 55 forms a guide means 57 for a diaphragm stem 58 and has a through-channel 59. The lower half-shell 51 is provided with a crimped-on sg/vls ~3 ~
~_ -6-connecting ring 60 which by means of a step 61 carries a third fixing element 62 in the form of a union nut identical to second fixing element 38. An open region 63 remains inside this connecting ring. The diaphragm 53 is reinforced by a double plate 64. On one side the double plate engages a stop member 65 of the diaphragm stem 58 but is otherwise displaceable on this diaphragm stem. The diaphragm 53 divides the diaphragm capsule 3 into two pressure spaces 66 and 67 and is loaded by a loading spring 68 which passes through the open region 63 and bears on the valve housing 4.
The fixing elements are designed so that both the second fixing element 38 of the diaphragm capsule 2 and the third fixing element 62 of the diaphragm capsule 3 are capable of acting together with the first fixing element 28 on the valve housing 4.
The diaphragm capsule 3 additionally has the fourth fixing element 56 which is capable of acting together with the second fixing element 38 of the first diaphragm capsule 2. The two arrangements shown in Figs. 1 and 2 can be produced in this manner.
Assuming that the pressure-difference control valve is arranged in the return line of a heating system, in the first arrangement shown in Fig. 1 the diaphragm capsule 2 is mounted by means of the fixing elements 28 and 38 on the valve housing 4 and the connection 34 is connected to the inlet line. This means that the pressure space 44 carries inlet pressure and the pressure space 43, because it is connected to the valve chamber 21 by way of the connecting channel 22, carries return pressure. Consequently, the diaphragm capsule 2 produces a force acting in the closing direction of the valve, which essentially counteracts the force of the set-point spring so that a state of equilibrium develops.
Under the influence of the valve spring 27, the plate 26 of the valve stem 16 lies non-positively on the bearing surface 45 of the insert 40.
In the second arrangement shown in Fig. 2, the diaphragm capsule 3 is additionally inserted between the diaphragm capsule sg/vlg ,~
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'_ The invention relates to a kit of parts for a differential-pressure control valve. The differential-pressure control valve is intended in particular for use in heating systems having radiators, in which the pressure difference between the inlet line and the return line is to be kept constant for the purpose of uniform supply.
The kit of parts is intended to allow two arrangements of such a differential-pressure valve to be produced using largely the same components. In particular, it is intended that the installer shall be able to select one or other arrangement on site.
Generally speaking, the present invention provides a kit of parts for a differential-pressure control valve, comprising: a valve housing with a valve stem passing, sealed, to the outside and first fixing elements arranged in the region of the outlet point; a first diaphragm capsule, which in a first arrangement is arranged to be mounted on the valve housing and for that purpose has second fixing elements matching the first fixing elements for connection of the capsule to the valve housing, and a diaphragm of the first diaphragm capsule carrying an abutment surface, which in the first arrangement is connected non-positively directly to the valve stem; a top unit, which is connected or is arranged to be connected to the first diaphragm capsule, and has adjustable set-point springs which act in the opening direction of the valve; and a second diaphragm capsule, which in a second arrangement is arranged to be mounted on the valve housing and for that purpose has third fixing elements matching the first fixing elements and which on the opposite side, for the purpose of mounting the first diaphragm capsule in the second arrangement, has fourth fixing elements corresponding to the first fixing elements and has a diaphragm which is displaceably held on a diaphragm stem and by way of a stop member acts together with the stem by means of a non-positive connection to couple the valve stem with the diaphragm of the first diaphragm capsule, whereby the diaphragm stem in the second Icd:sg .7.
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arrangement is inserted between the abutment of the diaphragm of the second diaphragm capsule and the valve shaft in a non-positive manner.
Using a valve housing, a first diaphragm capsule and a top unit, a differential-pressure control valve is produced that responds exclusively to the pressure difference on both sides of the diaphragm of the first diaphragm capsule, and in particular therefore to the difference between the inlet pressure and the return pressure. A
differential-pressure control valve of that kind has already been described in copending, commonly owned Canadian Patent Application No. 2,077,280.
The second arrangement is produced from the above-mentioned components and the second diaphragm capsule which, by virtue of the matching fixing elements and the associated diaphragm stem, can be installed very easily between the valve housing and the first diaphragm capsule. With the second diaphragm capsule, the pressure drop at a restrictor can be monitored, as is known (Samson AG "Me~ und Regeltechnik", type sheet T 3017, page 148). This enables the flow rate to be limited in addition to controlling the pressure difference.
In spite of all that, the diaphragm capsules need not be dismantled, but can be used in their entirety as constructional units.
There is also no risk of the diaphragms being damaged during the conversion.
The use of external threads and union nuts results in a very simple and stable connection of the individual components.
A non-positive connection enables the individual components to be connected together easily without special joining means having to be provided between the valve stem, abutment surface and diaphragm stem.
A non-positive connection also allows a free movement of the diaphragm of the second diaphragm capsule during the operation of controlling the pressure difference, and allows this diaphragm to ~cd:sg ..... ~,Q
'~ -exert an influence in the event of a limit value of the flow rate being exceeded.
The guide means keeps the diaphragm stem on its axial movement path, so that despite the non-positive connection it serves as a reliable force-transmitting member.
The construction of the invention enables the adjacent pressure spaces of the first and second diaphragm capsules to be interconnected, so that only one control line connection is required for that purpose.
With the construction of this invention it is also possible to supply the pressure space of the second diaphragm capsule facing towards the valve housing with pressure from a valve chamber, which likewise saves a control line connection.
The loading spring is expedient in many cases for imparting to the diaphragm of the second diaphragm capsule the bias that it requires for its function. A loading spring of this kind can easily be fitted during assembly. All that is required is to support it on the valve housing prior to putting the second diaphragm capsule in posltion .
It is possible to use two half-shells which are joined to one another by crimping, because the diaphragm capsules can be handled complete. The diaphragm is also well protected.
The crimp connections also contribute to the provision of the diaphragm capsules as non-separable components which can be installed without great concentration.
By using an adjustable throttling element in the valve the restrictor is formed, the pressure drop of which serves to actuate the second diaphragm capsule.
The invention is explained in detail hereinafter with reference to a preferred embodiment illustrated in the drawing, in which Icd:sg 5~
-- 3a -Fig. 1 shows a longitudinal section through a first arrangement of a differential-pressure control valve made from the kit of parts according to the invention, Fig. 2 shows a longitudinal section through a second arrangement of a differential-pressure control valve made from the kit of parts according to the invention, Fig. 3 shows an enlarged longitudinal section through the first and the second diaphragm capsule and Fig. 4 shows a diagrammatic circuit diagram for the installation of the second Icd:sg ' ~ f-arrangement of the differential-pressure control valve.
The kit of parts according to the invention comprises essentially four components, namely, a top unit 1, a first diaphragm capsule 2, a second diaphragm capsule 3 and a valve housing 4. For the second arrangement (Fig. 2), all four components are used, for the first arrangement (Fig. 1) the second diaphragm capsule 3 is omitted; the first diaphragm capsule 2 is positioned directly on the valve housing 4. The first arrangement corresponds to the differential-pressure control valve according to Canadian Application 2,077,280; refer to this application for further details.
The top unit 1 has a rotary knob 5 with which a supporting plate 6 for a setpoint spring 7 can be adjusted. This setpoint spring 7 acts by way of an intermediate member 8 with upwardly directed force on a connecting shaft 9 belonging to the first diaphragm capsule 2. Moreover, the top unit 1 has a base 10 with which it can be secured to the first diaphragm capsule 2.
The valve housing 4 has an inlet nipple 11, an outlet nipple 12 and between them a valve seat 13. In a neck portion 14 there is inserted an insert 15 which forms a guide means for a valve stem 16 which also carries a closure member 17. A restrictor 18 is formed by means of a throttling element 19 which is in the form of a cup with an inwardly curved rim, and is vertically adjustable from the outside by means of a screw 20 to change the restrictor cross-section. The valve chamber 21 between the restrictor 18 and the valve seat 13 is in connection, by way of a connecting channel 22, which runs through the closure member 17 and the valve stem 16, and by way of an outlet 23 passing through the insert 15, with the top side of this insert 15. A sheet-metal cup 24 separates this connecting channel from the outlet-side valve chamber. The valve stem 16 carries at its upper end a plate 26 against which a valve spring 27 that loads the closure member 17 sg/vls '~ ' 5 ~ ~
~_ -5-in the opening direction bears. On the outside of the neck portion 14 there is provided a first fixing element 28 in the form of an external thread.
The diaphragm capsule 2 comprises two half-shells 30 and 31 which are joined together at their edge by a crimp 32 which also holds the edge of a diaphragm 33 firmly clamped. The upper half-shell 30 carries a connecting nipple 34 for a control line and a crimp-mounted insert 35, through which the operating shaft 9 passes, sealed, to the outside. The top unit 2 is connected to the diaphragm capsule 2 by interengagement of the base 10 with the insert 35. At the opposite end, a connecting ring 36 is crimped on, and by means of a step 37 holds captive a second fixing element 38 in the form of a union nut. The diaphragm 33 is reinforced by a double plate 39, in the centre of which an insert 40 is mounted by crimping. Connected to the insert by way of a joint 41 is the shaft 9. The insert contains a non-return valve 42 which enables the pressure space 43 below the diaphragm 33 to be connected to the pressure space 44 above this diaphragm when the pressure difference is too great. On the underside of the insert 40 there is provided an abutment surface 45. The diaphragm 33 is loaded by a first spring 46, which is housed in the pressure space 43, and in the opposite direction is loaded by a spring 47, which is housed in the pressure space 44. The spring 46 projects through an open region 48 of the lower half-shell 31 and bears against the second diaphragm capsule 3. The spring 47 bears against the insert 35.
The second diaphragm capsule 3 also comprises two half-shells 50 and 51, which are joined together at their edge by crimping 52 which also grips the edge of the diaphragm 53. The upper half-shell carries a connecting nipple 54 for a control line.
An insert 55 is crimp-mounted on the shell and carries on its outside a fourth fixing element 56 in the form of an external thread identical to first fixing element 28. The insert 55 forms a guide means 57 for a diaphragm stem 58 and has a through-channel 59. The lower half-shell 51 is provided with a crimped-on sg/vls ~3 ~
~_ -6-connecting ring 60 which by means of a step 61 carries a third fixing element 62 in the form of a union nut identical to second fixing element 38. An open region 63 remains inside this connecting ring. The diaphragm 53 is reinforced by a double plate 64. On one side the double plate engages a stop member 65 of the diaphragm stem 58 but is otherwise displaceable on this diaphragm stem. The diaphragm 53 divides the diaphragm capsule 3 into two pressure spaces 66 and 67 and is loaded by a loading spring 68 which passes through the open region 63 and bears on the valve housing 4.
The fixing elements are designed so that both the second fixing element 38 of the diaphragm capsule 2 and the third fixing element 62 of the diaphragm capsule 3 are capable of acting together with the first fixing element 28 on the valve housing 4.
The diaphragm capsule 3 additionally has the fourth fixing element 56 which is capable of acting together with the second fixing element 38 of the first diaphragm capsule 2. The two arrangements shown in Figs. 1 and 2 can be produced in this manner.
Assuming that the pressure-difference control valve is arranged in the return line of a heating system, in the first arrangement shown in Fig. 1 the diaphragm capsule 2 is mounted by means of the fixing elements 28 and 38 on the valve housing 4 and the connection 34 is connected to the inlet line. This means that the pressure space 44 carries inlet pressure and the pressure space 43, because it is connected to the valve chamber 21 by way of the connecting channel 22, carries return pressure. Consequently, the diaphragm capsule 2 produces a force acting in the closing direction of the valve, which essentially counteracts the force of the set-point spring so that a state of equilibrium develops.
Under the influence of the valve spring 27, the plate 26 of the valve stem 16 lies non-positively on the bearing surface 45 of the insert 40.
In the second arrangement shown in Fig. 2, the diaphragm capsule 3 is additionally inserted between the diaphragm capsule sg/vlg ,~
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2 and the valve housing 4. Through the fixing elements 28 and 62 acting together it is joined to the valve housing 4, and through the fixing elements 56 and 38 acting together it is joined to the diaphragm capsule 2. The length of the diaphragm stem 58 corresponds approximately to the height of the diaphragm capsule 3 and is dimensioned so that under the influence of the valve spring 27 the plate 26 of the valve stem 16 merely engages the stop member 65 of the diaphragm stem 58 without positive contact and its end face merely engages the abutment surface 45 of the insert 40 without positive contact. It is, however, possible for the differential pressure in the diaphragm capsule 3 to take over the valve control, if the differential pressure effective there exceeds the force of the spring 68. The diaphragm stem 58 is then lifted from sg/vls "
the bearing surface 45 and controls the closure member 17 further into the closed position.
A preferred example of the application of the second arrangement is illustrated in Fig. 4. A
heating system has several radiators 70, 71 and 72, each of which is supplied with hot water by way of a thermostatic valve 73, 74 and 75 from a main inlet line 76 by way of a branch inlet line 77. The hot water returns by way of a branch return line 78 and a main return line 79 to the central heat source. A
differential-pressure control valve according to Fig. 2 is fitted into the branch return line 78. The connection 34 is connected to the branch inlet line 77 and the connection 54 iS connected to the branch return line 78. The connecting line 22 joins the lower pressure space 66 of the diaphragm capsule 3 to the valve chamber 21. The through-channel 59 joins the upper pressure space 67 of the diaphragm capsule 3 to the lower pressure space 43 of the diaphragm capsule 2.
The diaphragm capsule 2 therefore controls the valve operation so that the pressure drop between the branch inlet line 77 and the branch return line 78 remains approximately constant. The diaphragm capsule 3 ensures that the valve throttles whenever the pressure drop across the restrictor 18 is too great, that is, too great a flow rate is detected. Because the restrictor 18 arranged inside the valve housing 4 is adjustable, the maximum desired flow rate can be set using a spring 68 rated for all cases.
the bearing surface 45 and controls the closure member 17 further into the closed position.
A preferred example of the application of the second arrangement is illustrated in Fig. 4. A
heating system has several radiators 70, 71 and 72, each of which is supplied with hot water by way of a thermostatic valve 73, 74 and 75 from a main inlet line 76 by way of a branch inlet line 77. The hot water returns by way of a branch return line 78 and a main return line 79 to the central heat source. A
differential-pressure control valve according to Fig. 2 is fitted into the branch return line 78. The connection 34 is connected to the branch inlet line 77 and the connection 54 iS connected to the branch return line 78. The connecting line 22 joins the lower pressure space 66 of the diaphragm capsule 3 to the valve chamber 21. The through-channel 59 joins the upper pressure space 67 of the diaphragm capsule 3 to the lower pressure space 43 of the diaphragm capsule 2.
The diaphragm capsule 2 therefore controls the valve operation so that the pressure drop between the branch inlet line 77 and the branch return line 78 remains approximately constant. The diaphragm capsule 3 ensures that the valve throttles whenever the pressure drop across the restrictor 18 is too great, that is, too great a flow rate is detected. Because the restrictor 18 arranged inside the valve housing 4 is adjustable, the maximum desired flow rate can be set using a spring 68 rated for all cases.
Claims (10)
1. Kit of parts for a differential-pressure control valve, comprising:
a valve housing with a valve stem passing in a sealed manner from inside the housing to outside the housing and a first fixing element provided on the housing about said valve stem;
a first diaphragm capsule having a second fixing element engageable with said first fixing element for connection of said capsule to the valve housing, and a diaphragm carrying an abutment surface;
a top unit, which is connectable to the first diaphragm capsule, and has adjustable set-point springs which act in an opening direction of the valve; and a second diaphragm capsule having a third fixing element engageable with said first fixing element and which on a side opposite said third fixing element, for the purpose of mounting the first diaphragm capsule thereto, has a fourth fixing element corresponding to said first fixing element and has a diaphragm which is displaceably held on a diaphragm stem;
whereby: in a first arrangement of said parts said first diaphragm capsule is mounted to said valve housing by interengagement of said first and second fixing elements and the abutment surface of said first diaphragm capsule diaphragm engaging said valve stem, and said top unit being connected to said first diaphragm capsule; and in a second arrangement of said parts said second diaphragm capsule is mounted to said valve housing by interengagement of said first and third fixing elements, said first diaphragm capsule is mounted to said second diaphragm capsule by interengagement of said fourth and second fixing elements, the diaphragm stem of said second diaphragm capsule interconnecting, by way of a stop member, said valve stem with said diaphragm of said first diaphragm capsule.
a valve housing with a valve stem passing in a sealed manner from inside the housing to outside the housing and a first fixing element provided on the housing about said valve stem;
a first diaphragm capsule having a second fixing element engageable with said first fixing element for connection of said capsule to the valve housing, and a diaphragm carrying an abutment surface;
a top unit, which is connectable to the first diaphragm capsule, and has adjustable set-point springs which act in an opening direction of the valve; and a second diaphragm capsule having a third fixing element engageable with said first fixing element and which on a side opposite said third fixing element, for the purpose of mounting the first diaphragm capsule thereto, has a fourth fixing element corresponding to said first fixing element and has a diaphragm which is displaceably held on a diaphragm stem;
whereby: in a first arrangement of said parts said first diaphragm capsule is mounted to said valve housing by interengagement of said first and second fixing elements and the abutment surface of said first diaphragm capsule diaphragm engaging said valve stem, and said top unit being connected to said first diaphragm capsule; and in a second arrangement of said parts said second diaphragm capsule is mounted to said valve housing by interengagement of said first and third fixing elements, said first diaphragm capsule is mounted to said second diaphragm capsule by interengagement of said fourth and second fixing elements, the diaphragm stem of said second diaphragm capsule interconnecting, by way of a stop member, said valve stem with said diaphragm of said first diaphragm capsule.
2. A kit of parts according to claim 1, in which the first and fourth fixing elements are formed by an external thread and the second and third fixing elements are formed by a union nut.
3. A kit of parts according to claim 1 or 2, in which adjacent the fourth fixing element the second diaphragm capsule has an insert with a guide means for the diaphragm stem thereof.
4. A kit of parts according to claim 3, in which the second fixing element of the first diaphragm capsule has a passage therethrough and a through-channel is provided in the insert of said second diaphragm capsule.
5. A kit of parts according to one of claims 1 to 4, in which the third fixing element of the second diaphragm capsule has a passage therethrough and a connecting channel runs through the valve housing and leaves a valve chamber positioned upstream of a valve seat thereof having its mouth within the first fixing element.
6. A kit of parts according to one of claims 1 to 5, in which a loading spring for installation between the valve housing and the diaphragm of said second diaphragm capsule is associated with the second diaphragm capsule in the second arrangement.
7. A kit of parts according to one of claims 1 to 6, in which the diaphragm capsules each comprise two half-shells which are joined at their edge to one another and to the diaphragm thereof by crimping.
8. A kit of parts according to claim 7, in which connecting rings which hold union nuts captive are fixed to one half-shall of the two diaphragm capsules by crimping.
9. A kit of parts according to claim 7, in which the insert is fixed to one half-shell of the second diaphragm capsule by crimping.
10. A kit of parts according to one of claims 1 to 9, in which the valve housing has an adjustable throttling element on a side lying opposite the point where the valve stem passes to the outside of the housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4139895A DE4139895C2 (en) | 1991-12-04 | 1991-12-04 | Kit for a differential pressure control valve |
| DEP4139895.5 | 1991-12-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2082584A1 CA2082584A1 (en) | 1993-06-05 |
| CA2082584C true CA2082584C (en) | 1999-03-02 |
Family
ID=6446200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002082584A Expired - Fee Related CA2082584C (en) | 1991-12-04 | 1992-11-10 | Kit of parts for a differential-pressure control valve |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA2082584C (en) |
| DE (1) | DE4139895C2 (en) |
| DK (1) | DK144492A (en) |
| PL (1) | PL170078B1 (en) |
| RU (1) | RU2069284C1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19618093C2 (en) * | 1996-05-06 | 2001-05-23 | Samson Ag | Device for regulating the temperature of domestic water |
| US20090120517A1 (en) * | 2007-11-12 | 2009-05-14 | Thomas Joseph Whitney | Self regulating valve to obtain low differential air pressure control |
| US7832327B2 (en) * | 2007-12-07 | 2010-11-16 | Fisher Controls International Llc | Ring sealed diaphragm |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1272667B (en) * | 1965-02-18 | 1968-07-11 | Gulde Regelarmaturen K G | Control valve |
| DE2110149C3 (en) * | 1971-03-03 | 1975-08-28 | Samson Apparatebau Ag, 6000 Frankfurt | Differential pressure control valve |
-
1991
- 1991-12-04 DE DE4139895A patent/DE4139895C2/en not_active Expired - Fee Related
-
1992
- 1992-11-10 CA CA002082584A patent/CA2082584C/en not_active Expired - Fee Related
- 1992-11-30 PL PL92296792A patent/PL170078B1/en unknown
- 1992-12-02 DK DK144492A patent/DK144492A/en not_active Application Discontinuation
- 1992-12-03 RU RU9292016285A patent/RU2069284C1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2082584A1 (en) | 1993-06-05 |
| PL296792A1 (en) | 1993-09-20 |
| DK144492D0 (en) | 1992-12-02 |
| DK144492A (en) | 1993-06-05 |
| RU2069284C1 (en) | 1996-11-20 |
| PL170078B1 (en) | 1996-10-31 |
| DE4139895A1 (en) | 1993-06-09 |
| DE4139895C2 (en) | 1995-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |