CA2116587A1 - Sprinkler system control valve for cold area - Google Patents
Sprinkler system control valve for cold areaInfo
- Publication number
- CA2116587A1 CA2116587A1 CA 2116587 CA2116587A CA2116587A1 CA 2116587 A1 CA2116587 A1 CA 2116587A1 CA 2116587 CA2116587 CA 2116587 CA 2116587 A CA2116587 A CA 2116587A CA 2116587 A1 CA2116587 A1 CA 2116587A1
- Authority
- CA
- Canada
- Prior art keywords
- plug
- water
- housing
- cavity
- air
- 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.)
- Abandoned
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000013016 damping Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000008014 freezing Effects 0.000 abstract description 8
- 238000007710 freezing Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/002—Fire prevention, containment or extinguishing specially adapted for particular objects or places for warehouses, storage areas or other installations for storing goods
- A62C3/004—Fire prevention, containment or extinguishing specially adapted for particular objects or places for warehouses, storage areas or other installations for storing goods for freezing warehouses and storages
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
- E03B7/10—Devices preventing bursting of pipes by freezing
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Mechanical Engineering (AREA)
- Operations Research (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Safety Valves (AREA)
Abstract
The device is a differential type valve used for dry pipe fire protection as a Sprinkler or Deluge System Control Valve.
Conduits and trim susceptible to freezing are minimised if not eliminated; instead internal passageways through the valve are used to connect the pressure from one zone to another. Different versions are presented, the advantages of each mentioned. The proposed device in its different forms, consists mainly of a housing and a plug, seal rings are used to prevent the water and or air pressure from being transmitted from one area to another.
A damper is added to absorb pulses in the water supply line.
Consisting of few parts, the device is simple, easy to arm and to maintain, cheaper to manufacture in addition to its main advantage that of having a minimum wetted surfaces exposed to freezing.
Conduits and trim susceptible to freezing are minimised if not eliminated; instead internal passageways through the valve are used to connect the pressure from one zone to another. Different versions are presented, the advantages of each mentioned. The proposed device in its different forms, consists mainly of a housing and a plug, seal rings are used to prevent the water and or air pressure from being transmitted from one area to another.
A damper is added to absorb pulses in the water supply line.
Consisting of few parts, the device is simple, easy to arm and to maintain, cheaper to manufacture in addition to its main advantage that of having a minimum wetted surfaces exposed to freezing.
Description
spRINKr.~R SYST~ CONTROT. V~r.v~ FOR Cor.n ~R~.~
Sprinkler and Deluge Systems are used for fire protection of installations and equipments. In case of fire, a sensing device usually heat detectors, smoke detectors and or gas detectors trigger open a specially conceived valve, hereby called the System Control Valve. A System Control Valve should respond immediately to a demand and should not hinder or interrupt the flow of w~t~r.
In areas sub~ected to freezing, conduits downstream of the System Control Valve are drained when not in operation, while conduits upstream of the System Control Valve that are filled with water are either housed in a heated enclosure, or heat traced and insulated. Electricity and or steam are usually used for heating.
An interruption of power supply, for an extended period of time causes the wet part of the System to freeze. Small diameter conduits, or part of the system having a large surface to volume ratio, are the most vulnerable. Freezing may break parts, may cause the system to prematurely trigger open, or may prevent the system from functioning.
~0 This lnvention describes a device to be used as a Sprinkler or ~eluge System Autom~tlc control V~lve. Th~ propo~e~ ~vl~
simple, has few parts, can be easily fabricated and assembled, requires little maintenance, is simple to arm and has a minimum wetted surfaces, making it more suitable for protecting cold areas.
These and other objectlfs and advantages of the invention will be apparent from the following description and appended drawings:
Figure 1 is a schematic diagram and sectional view of a proposed water differential valve.
10 . Figure 2 is a schematic diagram and sectional view of a proposed air differential valve.
Figure 3 is a sectional view of a plug with a damping device for the device shown in figure 2.
. Figure 4 is a sectional view of an air differential valve in which the plug small diameter fits an auxiliary cavity in the housing.
Figure 5 is a sectional view of an air dlfferential valve in which the auxiliary cavity ls in the plug.
. Figure 6 is a sectional view of a device combining several of the features illustrated before. device.
The proposed device, a System Control Valve, covered by this invention is a water differential type valve; which depends on the water pressure in the housing chamber to hold the plug closed against the water supply pressure. The device, figure 1, 2~1658~
conslsts of a houslng ~0 and a free movlng plug S0. The houslng has a cavity 23, hereby called the housing chamber, a water supply connection 24, a water discharge connection 25, a water release connection 31, a main water drain 27, a vent 28, and a trickle drain 29. The plug is a two steps piston; has a small diameter and a large diameter, seal rings 51, 52 & 53, a drilled through passage 56, and a strainer orifice 58.
In the ready to use position; pressure is applied to the housing chamber 23 through the drilled hole 56 and the strainer orifice 58. The pressure trapped in the housing chamber holds the plug 50 in the closed position due to the plug areas differential design. Operation of an actuation device 15 or 16 opens the water release valve 14, water is released from the housing chamber at a rate faster than it can be replenished through the strainer orifice. This results in a rapid drop of the housing chamber pressure. The water supply pressure forces the plug open and allows water to flow.
Once the need for water ended the main water supply valve 11, ls closed, the main water draln valve 12 opened to dra1n the system; any water left over drains through the trickle drain 29.
As soon as possible after the operation, the proposed water differential valve must be reset; to do so water ls lntroduced through the water release valve 14 to push the plug to the closed posltlon and clean at the same time the filter 58, the main water drain valve 12 closed, the water release valve 14 then closed and the main water supply valve opened.
~1~6587 The proper operation and resetting of the device is monitored by heat sensing devices 15, actuators 16, pressure gauges 17, switches, and alarms that are part of a Deluge System but are not part of this lnvention.
Differential type valve using water to pressurise the housing chamber, do exist and are being used; however this invention is an improvement over those existing in the way the housing chamber is pressurised; rather than using small diameter conduits exposed to freezing to maintain the valve closed, this inventlon u~e~ a pa~age drllled through the body of the plug.
In another embodiment of the inventlon, the proposed device, a System Control Valve, i5 a differential type valve which depends upon the air pressure in the system to keep the device closed against the water supply pressure. The device, figure 2, consists of a housing 20 and a free moving plug 60. The housing, has a cavity 23, a water supply connection 24, a water discharge connection 25, an air supply connection with restriction orifice 26, an air release connection 32, a main water drain 27, a vent 28, and a trickle drain 29. The plug is a two steps piston; has a large area a, small area, and seal rings 63 & 64.
In the ready to use position, the housing chamber 23 is pressurised through the air supply ~ restriction orifice 26. The air trapped in the housing chamber hold the plug 60 closed due to a pressures/areas differential design. The air pressure and the plug large area are selected such that the force due to the air 2~16587 pressure in the houslng chambe~ ls greater than the for~e due to the water supply pressure by a comfortable margin that take care of fluctuatlons ln the air and water pressures. The vent 28 and the seal ring 64 prevent the water supply pressure from being applied onto the plug larger area.
Operation of an actuation device 14, 15 or 16 releases air in the housing chamber 23 at a rate much faster than it can be replenished through the air restriction orifice 26. The housing chamber air pressure drops rapidly, and the differential force holding the plug closed is nullified and the water supply pressure forces the plug 60 to open. Once the plug moves away from the closed position the water supply pressure is applied to the plug large area amplifylng the force due to the water pressure; the plug then obstructs the air supply connection 26 shutting off the air supply and preventing the plug from resetting.
Once the demand for water ended, the main isolation valve 11 is shut off, and the water drain valve 12 is opened to drain the system; any water left over will drain through the trickle drain.
To reset the proposed device air is introduced through the air release connection to push the plug towards the closed position and clears the air supply connection 26; then the main water supply valve 11 opened, and the water drain valve 12 closed. The proposed device is now restored to the ready to use closed posltion.
The proposed devlce respond time ie. the time it takes for 21165~
the device to open depends on the location the air supply connection 26, the size of its restriction orifice, and the volume of the air in the housing chamber 23.
A sudden rise in the water pressure caused by a pulse may prematurely trigger open the device. In another embodiment of the invention, shown in figure 3, the plug is modified to include a vent 67 and a damping mechanism. The damping mechanism consists of a damper 65 that fits a cavity in the plug and is retained by a device 66. The damper is a two steps piston; its small area subjected to water pressure and its large area to the air pressure. The damper diameters are chosen such that the force due to air pressure on its large area is marginally larger than that due to water pressure on its small area. A sudden rise in water pressure causes the damper to move absorbing the pulse without causing the plug to open; when the water pressure drops back to its original value, the air pressure pushes the damper 65 back to its original position.
To reduce the physical size of the proposed device without reducing its capacity the plug diameters are to be reduced. So far the plug small diameter equals and fits that of the water supply connection. To make the plug small diameter smaller than that of the water supply connection, the device is modified as shown in figure 4 to include a cavity 36, hereby called the auxiliary chamber, such that it fits the plug small diameter, and a passage 71 drllled through the plug 70 to transmit the water supply pressure to the auxiliary chamber 36. Except for these modifications the device is simllar, though smaller in size, to the one shown in figure 3.
In the ready to use position the housing chamber is pressurised by the system air through the air supply and restriction orifice 26 and the auxiliary chamber 36 is pressurlsed by the water supply through the passage 68 drllled through the plug; the vent 28 and the seal ring 69 prevent the water supply pressure from being applied onto the plug larger area. Here again the plug is maintained in the closed position by the valve pressure/area differential design.
In a variation of the embodiment of the invention shown in figure 4, the cavity is created in the plug rather than in the housing. So the plug 75 has a cavity 76 and the housing has a boss 38 that fits each other as shown in figure 5. This version of the invention has the advantage of further reducing the size of the devlce and the wetted surface exposed to freezlng.
The features described so far could be combined and incorporated to produce the device shown in figure 6. This prefered embodiment of the invention has the advantages of being compact, absorbs pressure pulses ln the water supply line, and has a minimum wetted surfaces exposed to freezing.
The proposed device conslsts of a houslng 21 and a free 2~16~87 moving plug 80. The housing, has a cavity 23, and a boss 38, a water supply connection 24, a water discharge connection 25, an air supply connection with restriction orifice 26, an air release connection 32, a main water drain 27, a vent 28, and a trickle drain 29. The plug 80 is a piston with a cavity 81; the piston fits the housing chamber 23 and the seal rings 82 & 83 prevents the leak of water and air from one zone to another. The housing boss 38 fits the plug cavity 81; a damper 86 is housed in an extension of the cavity and is retained by a device 87.
In the ready to use position, the houslng chamber 23 is pressurised through the air supply ~ restriction orifice 26, and the plug cavity is pressurised by the water supply through a passage in the plug 84. The plug outer diameter and the housing boss diameter are selected such that the force due to the air pressure in the housing chamber is greater than the force due to the water pressure in the plug cavity 81 by a comfortable margin that take care of fluctuations in the air and water pressures.
The vent 28 and the seal ring 64 prevent the water supply pressure from being applied onto the plug larger area.
The damper diameters are selected such that it creates a differential force smaller than the force that holds the plug closed such that a sudden rise in the water supply line pressure causes the damper to move absorbing the pulse without forcing the plug to open.
2S Operation of an actuation device releases air in the housing chamber 23 at a rate much faster than it can be replenished through the air restriction orlfice 26. The housing chamber air pressure drops rapidly and the differential force holding the plug closed is nullified. The water supply pressure forces the plug to open. Once the plug clears the housing boss 38 the water supply pressure is applied to the plug large area amplifying the force due to the water pressure; the plug then obstructs the air supply connection 26 shutting off the air supply and preventing the plug from resetting.
By eliminating the small conduits exposed to freezing and using internal avenues through the valve to transmit the water pressure the device became less susceptible to freezing.
Furthermore, because the device consists of few parts, the valve became simpler, easier to maintain and to arm, and cheaper to fabricate. Many modifications can be made to the invention disclosed. For example shock absorbing devices could be incorporated in the housing to absorb the slaming force caused by the abrupt opening of the plug. Furthermore the plug and the damper could be made hollow to reduce the weight of the device and or that space could be filled by a light weight substance to reduce the volume of the air cavity.
While this invention has been described in detail, it is not to be limited to the exact embodlments shown, because they are to serve merely as illustrative embodlment of the invention and not by way of limitation.
Sprinkler and Deluge Systems are used for fire protection of installations and equipments. In case of fire, a sensing device usually heat detectors, smoke detectors and or gas detectors trigger open a specially conceived valve, hereby called the System Control Valve. A System Control Valve should respond immediately to a demand and should not hinder or interrupt the flow of w~t~r.
In areas sub~ected to freezing, conduits downstream of the System Control Valve are drained when not in operation, while conduits upstream of the System Control Valve that are filled with water are either housed in a heated enclosure, or heat traced and insulated. Electricity and or steam are usually used for heating.
An interruption of power supply, for an extended period of time causes the wet part of the System to freeze. Small diameter conduits, or part of the system having a large surface to volume ratio, are the most vulnerable. Freezing may break parts, may cause the system to prematurely trigger open, or may prevent the system from functioning.
~0 This lnvention describes a device to be used as a Sprinkler or ~eluge System Autom~tlc control V~lve. Th~ propo~e~ ~vl~
simple, has few parts, can be easily fabricated and assembled, requires little maintenance, is simple to arm and has a minimum wetted surfaces, making it more suitable for protecting cold areas.
These and other objectlfs and advantages of the invention will be apparent from the following description and appended drawings:
Figure 1 is a schematic diagram and sectional view of a proposed water differential valve.
10 . Figure 2 is a schematic diagram and sectional view of a proposed air differential valve.
Figure 3 is a sectional view of a plug with a damping device for the device shown in figure 2.
. Figure 4 is a sectional view of an air differential valve in which the plug small diameter fits an auxiliary cavity in the housing.
Figure 5 is a sectional view of an air dlfferential valve in which the auxiliary cavity ls in the plug.
. Figure 6 is a sectional view of a device combining several of the features illustrated before. device.
The proposed device, a System Control Valve, covered by this invention is a water differential type valve; which depends on the water pressure in the housing chamber to hold the plug closed against the water supply pressure. The device, figure 1, 2~1658~
conslsts of a houslng ~0 and a free movlng plug S0. The houslng has a cavity 23, hereby called the housing chamber, a water supply connection 24, a water discharge connection 25, a water release connection 31, a main water drain 27, a vent 28, and a trickle drain 29. The plug is a two steps piston; has a small diameter and a large diameter, seal rings 51, 52 & 53, a drilled through passage 56, and a strainer orifice 58.
In the ready to use position; pressure is applied to the housing chamber 23 through the drilled hole 56 and the strainer orifice 58. The pressure trapped in the housing chamber holds the plug 50 in the closed position due to the plug areas differential design. Operation of an actuation device 15 or 16 opens the water release valve 14, water is released from the housing chamber at a rate faster than it can be replenished through the strainer orifice. This results in a rapid drop of the housing chamber pressure. The water supply pressure forces the plug open and allows water to flow.
Once the need for water ended the main water supply valve 11, ls closed, the main water draln valve 12 opened to dra1n the system; any water left over drains through the trickle drain 29.
As soon as possible after the operation, the proposed water differential valve must be reset; to do so water ls lntroduced through the water release valve 14 to push the plug to the closed posltlon and clean at the same time the filter 58, the main water drain valve 12 closed, the water release valve 14 then closed and the main water supply valve opened.
~1~6587 The proper operation and resetting of the device is monitored by heat sensing devices 15, actuators 16, pressure gauges 17, switches, and alarms that are part of a Deluge System but are not part of this lnvention.
Differential type valve using water to pressurise the housing chamber, do exist and are being used; however this invention is an improvement over those existing in the way the housing chamber is pressurised; rather than using small diameter conduits exposed to freezing to maintain the valve closed, this inventlon u~e~ a pa~age drllled through the body of the plug.
In another embodiment of the inventlon, the proposed device, a System Control Valve, i5 a differential type valve which depends upon the air pressure in the system to keep the device closed against the water supply pressure. The device, figure 2, consists of a housing 20 and a free moving plug 60. The housing, has a cavity 23, a water supply connection 24, a water discharge connection 25, an air supply connection with restriction orifice 26, an air release connection 32, a main water drain 27, a vent 28, and a trickle drain 29. The plug is a two steps piston; has a large area a, small area, and seal rings 63 & 64.
In the ready to use position, the housing chamber 23 is pressurised through the air supply ~ restriction orifice 26. The air trapped in the housing chamber hold the plug 60 closed due to a pressures/areas differential design. The air pressure and the plug large area are selected such that the force due to the air 2~16587 pressure in the houslng chambe~ ls greater than the for~e due to the water supply pressure by a comfortable margin that take care of fluctuatlons ln the air and water pressures. The vent 28 and the seal ring 64 prevent the water supply pressure from being applied onto the plug larger area.
Operation of an actuation device 14, 15 or 16 releases air in the housing chamber 23 at a rate much faster than it can be replenished through the air restriction orifice 26. The housing chamber air pressure drops rapidly, and the differential force holding the plug closed is nullified and the water supply pressure forces the plug 60 to open. Once the plug moves away from the closed position the water supply pressure is applied to the plug large area amplifylng the force due to the water pressure; the plug then obstructs the air supply connection 26 shutting off the air supply and preventing the plug from resetting.
Once the demand for water ended, the main isolation valve 11 is shut off, and the water drain valve 12 is opened to drain the system; any water left over will drain through the trickle drain.
To reset the proposed device air is introduced through the air release connection to push the plug towards the closed position and clears the air supply connection 26; then the main water supply valve 11 opened, and the water drain valve 12 closed. The proposed device is now restored to the ready to use closed posltion.
The proposed devlce respond time ie. the time it takes for 21165~
the device to open depends on the location the air supply connection 26, the size of its restriction orifice, and the volume of the air in the housing chamber 23.
A sudden rise in the water pressure caused by a pulse may prematurely trigger open the device. In another embodiment of the invention, shown in figure 3, the plug is modified to include a vent 67 and a damping mechanism. The damping mechanism consists of a damper 65 that fits a cavity in the plug and is retained by a device 66. The damper is a two steps piston; its small area subjected to water pressure and its large area to the air pressure. The damper diameters are chosen such that the force due to air pressure on its large area is marginally larger than that due to water pressure on its small area. A sudden rise in water pressure causes the damper to move absorbing the pulse without causing the plug to open; when the water pressure drops back to its original value, the air pressure pushes the damper 65 back to its original position.
To reduce the physical size of the proposed device without reducing its capacity the plug diameters are to be reduced. So far the plug small diameter equals and fits that of the water supply connection. To make the plug small diameter smaller than that of the water supply connection, the device is modified as shown in figure 4 to include a cavity 36, hereby called the auxiliary chamber, such that it fits the plug small diameter, and a passage 71 drllled through the plug 70 to transmit the water supply pressure to the auxiliary chamber 36. Except for these modifications the device is simllar, though smaller in size, to the one shown in figure 3.
In the ready to use position the housing chamber is pressurised by the system air through the air supply and restriction orifice 26 and the auxiliary chamber 36 is pressurlsed by the water supply through the passage 68 drllled through the plug; the vent 28 and the seal ring 69 prevent the water supply pressure from being applied onto the plug larger area. Here again the plug is maintained in the closed position by the valve pressure/area differential design.
In a variation of the embodiment of the invention shown in figure 4, the cavity is created in the plug rather than in the housing. So the plug 75 has a cavity 76 and the housing has a boss 38 that fits each other as shown in figure 5. This version of the invention has the advantage of further reducing the size of the devlce and the wetted surface exposed to freezlng.
The features described so far could be combined and incorporated to produce the device shown in figure 6. This prefered embodiment of the invention has the advantages of being compact, absorbs pressure pulses ln the water supply line, and has a minimum wetted surfaces exposed to freezing.
The proposed device conslsts of a houslng 21 and a free 2~16~87 moving plug 80. The housing, has a cavity 23, and a boss 38, a water supply connection 24, a water discharge connection 25, an air supply connection with restriction orifice 26, an air release connection 32, a main water drain 27, a vent 28, and a trickle drain 29. The plug 80 is a piston with a cavity 81; the piston fits the housing chamber 23 and the seal rings 82 & 83 prevents the leak of water and air from one zone to another. The housing boss 38 fits the plug cavity 81; a damper 86 is housed in an extension of the cavity and is retained by a device 87.
In the ready to use position, the houslng chamber 23 is pressurised through the air supply ~ restriction orifice 26, and the plug cavity is pressurised by the water supply through a passage in the plug 84. The plug outer diameter and the housing boss diameter are selected such that the force due to the air pressure in the housing chamber is greater than the force due to the water pressure in the plug cavity 81 by a comfortable margin that take care of fluctuations in the air and water pressures.
The vent 28 and the seal ring 64 prevent the water supply pressure from being applied onto the plug larger area.
The damper diameters are selected such that it creates a differential force smaller than the force that holds the plug closed such that a sudden rise in the water supply line pressure causes the damper to move absorbing the pulse without forcing the plug to open.
2S Operation of an actuation device releases air in the housing chamber 23 at a rate much faster than it can be replenished through the air restriction orlfice 26. The housing chamber air pressure drops rapidly and the differential force holding the plug closed is nullified. The water supply pressure forces the plug to open. Once the plug clears the housing boss 38 the water supply pressure is applied to the plug large area amplifying the force due to the water pressure; the plug then obstructs the air supply connection 26 shutting off the air supply and preventing the plug from resetting.
By eliminating the small conduits exposed to freezing and using internal avenues through the valve to transmit the water pressure the device became less susceptible to freezing.
Furthermore, because the device consists of few parts, the valve became simpler, easier to maintain and to arm, and cheaper to fabricate. Many modifications can be made to the invention disclosed. For example shock absorbing devices could be incorporated in the housing to absorb the slaming force caused by the abrupt opening of the plug. Furthermore the plug and the damper could be made hollow to reduce the weight of the device and or that space could be filled by a light weight substance to reduce the volume of the air cavity.
While this invention has been described in detail, it is not to be limited to the exact embodlments shown, because they are to serve merely as illustrative embodlment of the invention and not by way of limitation.
Claims (9)
1. A water pressure activated device used as a dry pipe Sprinkler or Deluge System Control Valve, comprising two sub assemblies, a housing and a free moving plug;
whereby the housing has a cavity, means to connect to a water supply line, water discharge line,water release line, drains and vents;
and whereby the plug, a two steps piston, has a large diameter that fits the housing chamber and a small diameter that fits the water supply connection, has a passage through the valve restricted by an orifice that transmit the water supply pressure to the housing cavity, means to prevent the water from leaking from one area to another except through the passage; and whereby the plug diameters are selected such that it creates a differential force that hold the device closed;
and whereby when the water trapped in the housing cavity is released through the water release connection, the differential force holding the plug closed is nullified, the plug forced to open and water flows through.
whereby the housing has a cavity, means to connect to a water supply line, water discharge line,water release line, drains and vents;
and whereby the plug, a two steps piston, has a large diameter that fits the housing chamber and a small diameter that fits the water supply connection, has a passage through the valve restricted by an orifice that transmit the water supply pressure to the housing cavity, means to prevent the water from leaking from one area to another except through the passage; and whereby the plug diameters are selected such that it creates a differential force that hold the device closed;
and whereby when the water trapped in the housing cavity is released through the water release connection, the differential force holding the plug closed is nullified, the plug forced to open and water flows through.
2. The device in claim 1 wherein the passage through the plug incorporates a filter to porevent dirt from blocking the orifice.
3. An air pressure activated device used as a dry pipe Sprinkler or Deluge System Control Valve, comprising two sub assemblies, a housing and a free moving plug;
whereby the housing has a cavity, means to connect to a water supply line, water discharge line, air supply line, air release line, drains and vents;
and whereby the plug, a free moving two steps piston, has a large diameter that fits the housing chamber and a small diameter that fits the water supply connection, means to prevent leakage from one area to another;
and whereby the differential pressure/areas design of the plug creates a force that hold the device closed;
and whereby when the air trapped in the housing cavity is released, through the air release connection, the differential force holding the plug closed is nullified, the plug forced to open, the air supply connection obstructed by the plug, the flow of air into the cavity is interrupted, and water flows through the device.
whereby the housing has a cavity, means to connect to a water supply line, water discharge line, air supply line, air release line, drains and vents;
and whereby the plug, a free moving two steps piston, has a large diameter that fits the housing chamber and a small diameter that fits the water supply connection, means to prevent leakage from one area to another;
and whereby the differential pressure/areas design of the plug creates a force that hold the device closed;
and whereby when the air trapped in the housing cavity is released, through the air release connection, the differential force holding the plug closed is nullified, the plug forced to open, the air supply connection obstructed by the plug, the flow of air into the cavity is interrupted, and water flows through the device.
4. The device in claim 3 wherein the air supply connection incorporates an orifice to limit the flow of air into the housing cavity.
5. The device in claim 3 or in claim 4 but wherein the plug incorporates a damping device, that consists of a two steps free moving piston that fits a cavity in the plug, means to retain the damper in the plug, and means to seal and prevent the leakage from one area to another;
and wherein the damper diameters are selected such that the air pressure applied onto the damper larger area creates a force marginally larger than that due to the water supply pressure applied onto the damper smaller area, such that when a pulse in the water supply line creates a sudden but short rise in the water pressure the resulting force pushes the damper absorbing the pulse without forcing the device to open.
and wherein the damper diameters are selected such that the air pressure applied onto the damper larger area creates a force marginally larger than that due to the water supply pressure applied onto the damper smaller area, such that when a pulse in the water supply line creates a sudden but short rise in the water pressure the resulting force pushes the damper absorbing the pulse without forcing the device to open.
6. The device in claim 3 or claim 4 wherein the housing has in addition to the housing cavity an auxiliary cavity;
and wherein the free moving plug large diameter fits the housing cavity and the plug small diameter fits the auxiliary cavity, and a passageway through the plug to transmit the water supply pressure to the auxiliary cavity, the rest of the description of the device remains the same as in claim 3 or in claim 4;
thus the plug is held closed by the differential force caused by the air supply pressure in the housing cavity applied to the plug large area and the water supply pressure in the auxiliary cavity applied onto the plug small area.
and wherein the free moving plug large diameter fits the housing cavity and the plug small diameter fits the auxiliary cavity, and a passageway through the plug to transmit the water supply pressure to the auxiliary cavity, the rest of the description of the device remains the same as in claim 3 or in claim 4;
thus the plug is held closed by the differential force caused by the air supply pressure in the housing cavity applied to the plug large area and the water supply pressure in the auxiliary cavity applied onto the plug small area.
7. The device in claim 6 except for a reverse in the location of the auxiliary cavity ie. the auxiliary cavity is created in the plug and not in the housing, and the housing now has a boss that fits the auxiliary cavity in the plug.
8. The device in claim 6 wherein the plug incorporates the damping device described in claim 5.
9. The device in claim 7 wherein the plug incorporates the damping device described in claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2116587 CA2116587A1 (en) | 1994-02-28 | 1994-02-28 | Sprinkler system control valve for cold area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2116587 CA2116587A1 (en) | 1994-02-28 | 1994-02-28 | Sprinkler system control valve for cold area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2116587A1 true CA2116587A1 (en) | 1995-08-29 |
Family
ID=4152981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2116587 Abandoned CA2116587A1 (en) | 1994-02-28 | 1994-02-28 | Sprinkler system control valve for cold area |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2116587A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3342467A4 (en) * | 2015-08-27 | 2019-04-03 | Seung Yun Kim | SINGLE RIGHT SINGLE CONNECTION FOR AUTOMATIC EXTINGUISHER PIPE FOR AUTOMATICALLY CONTROLLING WATER FLOW, AND EXTINGUISHER PIPE SYSTEM COMPRISING SAME |
-
1994
- 1994-02-28 CA CA 2116587 patent/CA2116587A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3342467A4 (en) * | 2015-08-27 | 2019-04-03 | Seung Yun Kim | SINGLE RIGHT SINGLE CONNECTION FOR AUTOMATIC EXTINGUISHER PIPE FOR AUTOMATICALLY CONTROLLING WATER FLOW, AND EXTINGUISHER PIPE SYSTEM COMPRISING SAME |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |