CA1286191C - Pilot operated coolant control valves - Google Patents
Pilot operated coolant control valvesInfo
- Publication number
- CA1286191C CA1286191C CA000558115A CA558115A CA1286191C CA 1286191 C CA1286191 C CA 1286191C CA 000558115 A CA000558115 A CA 000558115A CA 558115 A CA558115 A CA 558115A CA 1286191 C CA1286191 C CA 1286191C
- Authority
- CA
- Canada
- Prior art keywords
- pilot
- valve
- coolant
- chamber
- control valves
- 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 - Lifetime
Links
Landscapes
- Magnetically Actuated Valves (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Pilot operated coolant control valves in a manifold assembly for supplying a coolant under pressure, the coolant control valves are removable assemblies positioned in apertures in a body member closing the manifold, each of said coolant control valve assemblies has a cylindrical valve body apertured inwardly of one end and pilot valve chamber is provided in the cylindrical valve body, a valve element is movably positioned in the pilot valve chamber for movement with respect to a valve seat, a pilot air passageway and a vent air passageway are formed in the cylindrical valve body member communicating with the pilot control valves and the atmosphere, a coolant chamber provided in the manifold, apertures in the cylindrical valve body communicate with the coolant chamber, a solenoid in the pilot control valve moves a solenoid plunger when energized, secondary valve elements are positioned on the ends of said solenoid plunger, a pilot air supply chamber is formed in the manifold and passageways are formed between the pilot control valve and said pilot air supply chamber, the passage-ways communicate with the pilot air chamber to maintain the valve element closed against the valve seat to the flow of coolant when said solenoid coil is de-energized, a spring will move the solenoid plunger to seal said pilot air passageway so that coolant pressure moves said valve element supplying the coolant to a spray nozzle.
Pilot operated coolant control valves in a manifold assembly for supplying a coolant under pressure, the coolant control valves are removable assemblies positioned in apertures in a body member closing the manifold, each of said coolant control valve assemblies has a cylindrical valve body apertured inwardly of one end and pilot valve chamber is provided in the cylindrical valve body, a valve element is movably positioned in the pilot valve chamber for movement with respect to a valve seat, a pilot air passageway and a vent air passageway are formed in the cylindrical valve body member communicating with the pilot control valves and the atmosphere, a coolant chamber provided in the manifold, apertures in the cylindrical valve body communicate with the coolant chamber, a solenoid in the pilot control valve moves a solenoid plunger when energized, secondary valve elements are positioned on the ends of said solenoid plunger, a pilot air supply chamber is formed in the manifold and passageways are formed between the pilot control valve and said pilot air supply chamber, the passage-ways communicate with the pilot air chamber to maintain the valve element closed against the valve seat to the flow of coolant when said solenoid coil is de-energized, a spring will move the solenoid plunger to seal said pilot air passageway so that coolant pressure moves said valve element supplying the coolant to a spray nozzle.
Description
61~
PILOT OPERATED COOLANT CONTROL VALVES
Back~round of the Inventio Technical Field:
Tllis invention relates to coolant control valves for rolling mills that are used for the reduction of metals and require coolant to be supplied during use.
Descri~tion of the Prior Art:
Prior art devices of this type have generally relied on a plurality of remotely positioned pilot control valves requiring a large number of inter-connecting controlled conduits extending from the pilot valves to the coolant control valves at the point of us. Prior art patents relating to pilot operated control valves include U.S. Patents 3,145,967 to Gardner of Aug., 1964, 3,159,374 to Kroffke of Dec., 1964, 4,391,296 to Abbott of July, 1~83, 3,880,358 to Schaming of April, 1975, 4,360,037 to Kendall of Nov., 1982, 4,387,739 to Schaming of June, 1983, 4,247,047 to Schaming of Jan., 1982 and 4,568,026 to Baun, Feb., 1986.
In U.S. Patent 3,145,967 an elastic sleeve is arranged in relation to a core positioned in a fluid passageway and by the introduction of air pressure will distort the plastic - - -sleeve inwardly against the core closing the fluid passage-way. The air pressure is controlled by a solenoid operated valve.
In U.S. Patent 3,159,374 a flexible diaphragm is arranged to intercept a fluid passageway through the valve when fluid pressure is applied to one side of the diaphragm to distort same, closing the passageway. The fluid pressure for operating the diaphragm is controlled by a solenoid valve.
In U.S. Patent 4,391,296 a valve having a valve plug which moves in and out of closing relation respect to a fluid passageway between an inlet and an outlet port is shown wherein the valve plug is urgedclosed by a spring and moved to open position by a solenoid.
In U.S. Patent 3,880,358 a coolant control valve is dis-lS closed which utilizes a spring urged valve element for closedposition and a control fluid, such as air, to urge the valve element to open position.
In U.S. Patent 4,360,037 a self-cleaning filter assembly for a solenoid actuated valve is disclosed which uses fluid pressure to operate a diaphram to control the opening and lX86~9~
closing of the valve.
In U.S. Patent 4,387,739 a valve module for a digital coolant control system is disclosed which utilizes a solenoid urged valve element with a spring return to control the fluid coolant through the passageway defined.
In U.S. Patent 4,247,047 a zoned digital coolant system is disclosed which shows a plurality of valves in a multiple manifold configuration with each of the valve elements being activated by a solenoid and spring return for the supply of coolant to a spray nozzle.
Finally, in applicant's U.S. Patent 4,568,026 a pilot operated coolant control valve in a manifold assembly is disclosed which defines the combination of a cartridge valve system having a spring urged valve element for control of coolant to a spray nozzle activated by an encased adjacent~
pilot control valve which is activated by a solenoid,and spring return. The patent allows for multiple positioning of easily replaced cartridge valve assemblies within a multiple manifold configuration including the electrical connections in a totallyenclosed-anvironment.
~.X8619~
Applicant's present invention allows for positioning point of use control of coolant valves reducing the cost and complexity of installation and repair time normally required due to the length of the pilot air supply lines from the pilot valves which are normally remotely located to the coolant control valves as normally found in standard rolling mill environments.
SummarY of the Invention A pilot operated multiple coolant control valve assembly for use in rolling mills provides for a series of coolant control valves and associated pilot controls to be positioned in a single assembly at the point of use. Each of the coolant control valves is controlled independently via a solenoid operated pilot control valve encapsulated adjacent each of the coolant control valves. The valve assemblies provide safe reliable operation in a difficult and dirty environment by isolating the pilot controls and control valves in a multiple segmented housing manifold.
Descri~tion of the Drawin~s Figure 1 is cross-sectional elevation of a manifold lX8619~
assembly and associated coolant control valves;
Figure 2 is a cross-sectional view on lines 2-2 of Figure 1; and Figure 3 is a cross-sectional view on lines 3-3 of Figure 1.
Descri~tion of the Preferred Embodim~nt Referring to Figure 1 of the drawings a pilot operated coolant control valve assembly 10 can be seen comprising a multiple housing configuration 11 with oppositely disposed closed ends 12 defining a pilot air supply chamber 13, a electrical control chamber 14 and a coolant supply chamber 15. Coolant inlet ports 16 are positioned in the housing configuration 11 adjacent to and communicating with the coolant supply chamber 15. A plurality of body members 17 are sealingly attached to an open side of the housing 11 and carry a plurality of coolant control valves 18 in spaced apertures 19 therein. Each of the coolant control valves 18 is comprised of a cylindrical valve body 20 having several openings 21 within. The openings 21 in each cylindrical valve body 20 define coolant passageways to the valves 18.
1~86~9~
A pilot air passage 22 and a vent air passage 23 extend from the interior of the cylindrical valve body 20 to openings 24 and 25 respectively having annular sealing o-rings 26 around the opening 24.- A closure 27 is secured -in sealing relation by an o-ring 28 in an open end of the -cylindrical valve body 20 opposite said openings 24 and 25 and defines a pilot air activation chamber 29. An area of reduced interior diameter at 30 in the pilot air activation chamber 29 has a movable valve element 31 positioned partially therein The valve element 31 has a conical end 32 with a annular groove and a annular sealing member 33 in the area of reduced diameter 30 with a larger opposite end portion 34 within the pilot air activation chamber 29. A secondary annular sealing member 35 is positioned in the larger opposite end portion 34 dividing the pilot air activation chamber 29 between a pilot air inlet 36 and a vent outlet .
at 37. An annular reduction fitting 38 is threadably secured in the opposite open end of the cylindrical valve body 20 and has a sealing member 39 adjacent one end. The reduction fitting 38 defines a coolant passageway 40 and a portion of a 1286~9~
valve seat 41 most of which is in the adjacent valve body 20.
Referring now to the pilot air supply chamber 13 an outlet 42 is formed in the body member 17 and communicates with a pilot air conduit 42'in a pilot valve mounting body 43 which is in sealirrg relation with the body member 17 as best seen in Figure 2 of the drawings. The pilot valve mounting body 43 also has a wire way 44 extending in parallel spaced relation to said pilot air conduit 42'. A pair of spaced longitudinally aligned cavities 45 extend into the pilot valve mounting body mernber 43 intersecting said wire way 44 and each of the pilot valve chambers 46 thereof. A passageway 47 establishes communication between the pilot valve chamber 46 and the pilot air passage 22 in the cylindrical valve body 20 as hereinbefore described. Pilot valves 48 are positioned within the pilot valve chambers 46 and each comprises a solenoid plunger 49 which is movably poæitioned in a sleeve 50 which defines part of the pilot valve chamber 46 and which sleeve 50 is positioned within a solenoid coil 51 which is encapsulated by a suitable resin 52 which holds the solenoid coil 51 in the cavity 45 intersectingthepilot -~36~
air conduit 42.' The sleeve 50 has a passageway 53 positioned on the end thereof opposite the pilot valve chamber 46 and communicates with the atmosphere.
Still referring to Figure 2 of the drawings, it will be seen that the plunger 49 moves to the right responsive to energization of the coil 51. A seal in the opposite end of the plunger 49 engages and closes an opening in the pilot valve seat 54 when the coil 51 is de-energized and a spring 55 moves the plunger 49 to the left as is illustrated in Figure 2 on the lower of the two pilot valves illustrated.
In operation, when this occurs, the fluid air pressure extends through the pilot valve chamber 46, the passageway 47 and the air passageway 22 through the inlet 36 into the pilot air activation chamber 29 forcing the valve element 31 forward overcoming the coolant pressure through the openlngs 21 in the cylindrical valve body 20 shutting off the flow of coolant to a nozzle 56 in a nozzle plate assembly 57 via a coolant passageway 59 within the body member 43.
The nozzle plate assembly is secured to the pilot valve mounting body member 43 by fasteners 58.
An 0-ring 60 is positioned around each of the spray lX8~19~
nozzles 57 sealing the nozzle plate assembly 58 thereto.
Upon de-energization of the solenoid coil 51 the plunger 49 urged by the spring 55 seals against the pilot valve seat 54 as hereinbefore described shutting off the pilot fluid pressure against the valve element 31. The differential of coolant pressure forces the valve element 31 back within the pilot air activation chamber 29 allowing the coolant to flow out through the spray nozzles 56. The solenoid coil 51 is activated by an electrical control circuit via control wires 61 extending from a multiple electrical plug 62 seen in both Figures 1 and 2 of the drawings extending by cable 63 through the electrical control chamber 14. The control wire passage-way 44 has an area of increased interior diameter at 64 that intersects with a right angularly positioned secondary contro].
passageway 65 in the pilot valve mounting plate 43 into which extends the hereinbefore described multiple electrical plug 62. Each of the pilot control valves 48 and associated wire ways 44 are filled with epoxy resin R encapsulating the components and wires within the pilot valve mounting plate lZ86~91 Referring now to Figure 3 of the drawings, the cavities45 have adjacent vent extending passageways 66 that align with said vent passageways 23.
The solenoid coils 51 being sealed and held in place by the epoxy resin are protected from damage which might occur from the contaminated environment in which the valve assembly is placed. The solenoid coils 51 are designed to operated at 24 volts DC and draw a maximum of .30 amps. The plungers 49 and coils 51 are so designed that the same are fully operational at 85% of indicated voltage and thus evidence small power requirements which substantially improve the device, both with respect to automatic and manual input signals fcr operation.
Thus, it will be seen that coolant control valves in a manifold assembly have been illustrated and described and that it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention, therefore I claim:
PILOT OPERATED COOLANT CONTROL VALVES
Back~round of the Inventio Technical Field:
Tllis invention relates to coolant control valves for rolling mills that are used for the reduction of metals and require coolant to be supplied during use.
Descri~tion of the Prior Art:
Prior art devices of this type have generally relied on a plurality of remotely positioned pilot control valves requiring a large number of inter-connecting controlled conduits extending from the pilot valves to the coolant control valves at the point of us. Prior art patents relating to pilot operated control valves include U.S. Patents 3,145,967 to Gardner of Aug., 1964, 3,159,374 to Kroffke of Dec., 1964, 4,391,296 to Abbott of July, 1~83, 3,880,358 to Schaming of April, 1975, 4,360,037 to Kendall of Nov., 1982, 4,387,739 to Schaming of June, 1983, 4,247,047 to Schaming of Jan., 1982 and 4,568,026 to Baun, Feb., 1986.
In U.S. Patent 3,145,967 an elastic sleeve is arranged in relation to a core positioned in a fluid passageway and by the introduction of air pressure will distort the plastic - - -sleeve inwardly against the core closing the fluid passage-way. The air pressure is controlled by a solenoid operated valve.
In U.S. Patent 3,159,374 a flexible diaphragm is arranged to intercept a fluid passageway through the valve when fluid pressure is applied to one side of the diaphragm to distort same, closing the passageway. The fluid pressure for operating the diaphragm is controlled by a solenoid valve.
In U.S. Patent 4,391,296 a valve having a valve plug which moves in and out of closing relation respect to a fluid passageway between an inlet and an outlet port is shown wherein the valve plug is urgedclosed by a spring and moved to open position by a solenoid.
In U.S. Patent 3,880,358 a coolant control valve is dis-lS closed which utilizes a spring urged valve element for closedposition and a control fluid, such as air, to urge the valve element to open position.
In U.S. Patent 4,360,037 a self-cleaning filter assembly for a solenoid actuated valve is disclosed which uses fluid pressure to operate a diaphram to control the opening and lX86~9~
closing of the valve.
In U.S. Patent 4,387,739 a valve module for a digital coolant control system is disclosed which utilizes a solenoid urged valve element with a spring return to control the fluid coolant through the passageway defined.
In U.S. Patent 4,247,047 a zoned digital coolant system is disclosed which shows a plurality of valves in a multiple manifold configuration with each of the valve elements being activated by a solenoid and spring return for the supply of coolant to a spray nozzle.
Finally, in applicant's U.S. Patent 4,568,026 a pilot operated coolant control valve in a manifold assembly is disclosed which defines the combination of a cartridge valve system having a spring urged valve element for control of coolant to a spray nozzle activated by an encased adjacent~
pilot control valve which is activated by a solenoid,and spring return. The patent allows for multiple positioning of easily replaced cartridge valve assemblies within a multiple manifold configuration including the electrical connections in a totallyenclosed-anvironment.
~.X8619~
Applicant's present invention allows for positioning point of use control of coolant valves reducing the cost and complexity of installation and repair time normally required due to the length of the pilot air supply lines from the pilot valves which are normally remotely located to the coolant control valves as normally found in standard rolling mill environments.
SummarY of the Invention A pilot operated multiple coolant control valve assembly for use in rolling mills provides for a series of coolant control valves and associated pilot controls to be positioned in a single assembly at the point of use. Each of the coolant control valves is controlled independently via a solenoid operated pilot control valve encapsulated adjacent each of the coolant control valves. The valve assemblies provide safe reliable operation in a difficult and dirty environment by isolating the pilot controls and control valves in a multiple segmented housing manifold.
Descri~tion of the Drawin~s Figure 1 is cross-sectional elevation of a manifold lX8619~
assembly and associated coolant control valves;
Figure 2 is a cross-sectional view on lines 2-2 of Figure 1; and Figure 3 is a cross-sectional view on lines 3-3 of Figure 1.
Descri~tion of the Preferred Embodim~nt Referring to Figure 1 of the drawings a pilot operated coolant control valve assembly 10 can be seen comprising a multiple housing configuration 11 with oppositely disposed closed ends 12 defining a pilot air supply chamber 13, a electrical control chamber 14 and a coolant supply chamber 15. Coolant inlet ports 16 are positioned in the housing configuration 11 adjacent to and communicating with the coolant supply chamber 15. A plurality of body members 17 are sealingly attached to an open side of the housing 11 and carry a plurality of coolant control valves 18 in spaced apertures 19 therein. Each of the coolant control valves 18 is comprised of a cylindrical valve body 20 having several openings 21 within. The openings 21 in each cylindrical valve body 20 define coolant passageways to the valves 18.
1~86~9~
A pilot air passage 22 and a vent air passage 23 extend from the interior of the cylindrical valve body 20 to openings 24 and 25 respectively having annular sealing o-rings 26 around the opening 24.- A closure 27 is secured -in sealing relation by an o-ring 28 in an open end of the -cylindrical valve body 20 opposite said openings 24 and 25 and defines a pilot air activation chamber 29. An area of reduced interior diameter at 30 in the pilot air activation chamber 29 has a movable valve element 31 positioned partially therein The valve element 31 has a conical end 32 with a annular groove and a annular sealing member 33 in the area of reduced diameter 30 with a larger opposite end portion 34 within the pilot air activation chamber 29. A secondary annular sealing member 35 is positioned in the larger opposite end portion 34 dividing the pilot air activation chamber 29 between a pilot air inlet 36 and a vent outlet .
at 37. An annular reduction fitting 38 is threadably secured in the opposite open end of the cylindrical valve body 20 and has a sealing member 39 adjacent one end. The reduction fitting 38 defines a coolant passageway 40 and a portion of a 1286~9~
valve seat 41 most of which is in the adjacent valve body 20.
Referring now to the pilot air supply chamber 13 an outlet 42 is formed in the body member 17 and communicates with a pilot air conduit 42'in a pilot valve mounting body 43 which is in sealirrg relation with the body member 17 as best seen in Figure 2 of the drawings. The pilot valve mounting body 43 also has a wire way 44 extending in parallel spaced relation to said pilot air conduit 42'. A pair of spaced longitudinally aligned cavities 45 extend into the pilot valve mounting body mernber 43 intersecting said wire way 44 and each of the pilot valve chambers 46 thereof. A passageway 47 establishes communication between the pilot valve chamber 46 and the pilot air passage 22 in the cylindrical valve body 20 as hereinbefore described. Pilot valves 48 are positioned within the pilot valve chambers 46 and each comprises a solenoid plunger 49 which is movably poæitioned in a sleeve 50 which defines part of the pilot valve chamber 46 and which sleeve 50 is positioned within a solenoid coil 51 which is encapsulated by a suitable resin 52 which holds the solenoid coil 51 in the cavity 45 intersectingthepilot -~36~
air conduit 42.' The sleeve 50 has a passageway 53 positioned on the end thereof opposite the pilot valve chamber 46 and communicates with the atmosphere.
Still referring to Figure 2 of the drawings, it will be seen that the plunger 49 moves to the right responsive to energization of the coil 51. A seal in the opposite end of the plunger 49 engages and closes an opening in the pilot valve seat 54 when the coil 51 is de-energized and a spring 55 moves the plunger 49 to the left as is illustrated in Figure 2 on the lower of the two pilot valves illustrated.
In operation, when this occurs, the fluid air pressure extends through the pilot valve chamber 46, the passageway 47 and the air passageway 22 through the inlet 36 into the pilot air activation chamber 29 forcing the valve element 31 forward overcoming the coolant pressure through the openlngs 21 in the cylindrical valve body 20 shutting off the flow of coolant to a nozzle 56 in a nozzle plate assembly 57 via a coolant passageway 59 within the body member 43.
The nozzle plate assembly is secured to the pilot valve mounting body member 43 by fasteners 58.
An 0-ring 60 is positioned around each of the spray lX8~19~
nozzles 57 sealing the nozzle plate assembly 58 thereto.
Upon de-energization of the solenoid coil 51 the plunger 49 urged by the spring 55 seals against the pilot valve seat 54 as hereinbefore described shutting off the pilot fluid pressure against the valve element 31. The differential of coolant pressure forces the valve element 31 back within the pilot air activation chamber 29 allowing the coolant to flow out through the spray nozzles 56. The solenoid coil 51 is activated by an electrical control circuit via control wires 61 extending from a multiple electrical plug 62 seen in both Figures 1 and 2 of the drawings extending by cable 63 through the electrical control chamber 14. The control wire passage-way 44 has an area of increased interior diameter at 64 that intersects with a right angularly positioned secondary contro].
passageway 65 in the pilot valve mounting plate 43 into which extends the hereinbefore described multiple electrical plug 62. Each of the pilot control valves 48 and associated wire ways 44 are filled with epoxy resin R encapsulating the components and wires within the pilot valve mounting plate lZ86~91 Referring now to Figure 3 of the drawings, the cavities45 have adjacent vent extending passageways 66 that align with said vent passageways 23.
The solenoid coils 51 being sealed and held in place by the epoxy resin are protected from damage which might occur from the contaminated environment in which the valve assembly is placed. The solenoid coils 51 are designed to operated at 24 volts DC and draw a maximum of .30 amps. The plungers 49 and coils 51 are so designed that the same are fully operational at 85% of indicated voltage and thus evidence small power requirements which substantially improve the device, both with respect to automatic and manual input signals fcr operation.
Thus, it will be seen that coolant control valves in a manifold assembly have been illustrated and described and that it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention, therefore I claim:
Claims (5)
1. An improvement in pilot operated coolant control valves in a manifold assembly for supplying a coolant under pressure, the improvement comprises in combination forming the coolant control valves as removable assemblies positioned within an apertured body member closing said manifold, independent pilot control valves positioned in a pilot valve mounting plate removably secured against said apertured body member, each of said coolant control valve assemblies consisting of a cylindrical valve body apertured inwardly of one end, a pilot valve chamber within said cylindrical valve body, a valve element movably positioned within said pilot valve chamber, a valve seat in said valve body, means for closing one end of said apertured valve body, sealing means on said valve element, a pilot air passageway and a vent air passageway within said cylindrical valve body member communicating with said pilot control valves and the atmosphere respectively, a coolant chamber in said manifold, apertures in said cylindrical valve body communicating with said coolant chamber, a solenoid coil in said pilot control valve for moving a solenoid plunger therein when energized, secondary valve elements on the ends of said solenoid plunger, a pilot air supply chamber within said manifold, means communicating between said pilot control valve and said pilot air supply chamber, oppositely disposed passageways communicating with said pilot air chamber to maintain said valve element closed against said valve seat stopping the flow of coolant when said solenoid coil is de-energized, a spring for moving said plunger to seal said pilot air passageway whereby coolant pressure moves said valve element supplying said coolant to a spray means in communication with said coolant supply valve, an electrical circuit in communication with said solenoid coil for energizing the same.
2. The improvement in pilot operated coolant control valves set forth in claim 1 wherein said pilot air passage-way in said cylindrical body member communicates with said pilot valve through said pilot valve mounting plate.
3. The improvement in pilot operated coolant control valves set forth in claim 1 wherein said means for closing one end of said apertured valve body comprises an annular closure sealingly engaged therein.
4. The improvement in pilot operated coolant control valves set forth in claim 1 wherein said sealing means on said valve element comprises o-rings therein.
5. The improvement in pilot operated coolant control valves of claim 1 wherein said electrical conductors in communication with said solenoid coils extend through passage-ways in said pilot valve body member, electrical receptacles within said body member for engagement with said electrical conductors and wherein said passageways and said cavity within said pilot valve body member is filled with epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000558115A CA1286191C (en) | 1988-02-04 | 1988-02-04 | Pilot operated coolant control valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000558115A CA1286191C (en) | 1988-02-04 | 1988-02-04 | Pilot operated coolant control valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1286191C true CA1286191C (en) | 1991-07-16 |
Family
ID=4137388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000558115A Expired - Lifetime CA1286191C (en) | 1988-02-04 | 1988-02-04 | Pilot operated coolant control valves |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1286191C (en) |
-
1988
- 1988-02-04 CA CA000558115A patent/CA1286191C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |