CA1332042C - Tire inflation valve having overpressure and flow control - Google Patents
Tire inflation valve having overpressure and flow controlInfo
- Publication number
- CA1332042C CA1332042C CA 610491 CA610491A CA1332042C CA 1332042 C CA1332042 C CA 1332042C CA 610491 CA610491 CA 610491 CA 610491 A CA610491 A CA 610491A CA 1332042 C CA1332042 C CA 1332042C
- Authority
- CA
- Canada
- Prior art keywords
- valve
- flow
- pressure
- gas
- tire
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/20—Check valves specially designed for inflatable bodies, e.g. tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C29/00—Arrangements of tyre-inflating valves to tyres or rims; Accessories for tyre-inflating valves, not otherwise provided for
- B60C29/06—Accessories for tyre-inflating valves, e.g. housings, guards, covers for valve caps, locks, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A tire fill valve having pressure relief and tire fill fluid gas flow limiting characteristics for use in filling tires to a predetermined pressure from a large flow capacity gas source delivering fill gas at a substantially greater pressure. Gases utilized typically are air or nitrogen. The valve of the invention is wheel mounted intermediate the gas pressurizing source and the tire gas valve inlet.
Tire fill gas from a high pressure high capacity source passes through a flow limiting orifice having a positive closure or shutoff member and passes through a pressure sensitive chamber as it enters the tire.
Chamber pressure is sensed by a spring loaded valve disk controlling relief or venting orifices. When fill pressure in the pressure sensing chamber exceeds a pre-determined value established by the valve disk area and valve disk springs, the disk lifts allowing the venting of the fill gas. Overpressurization of the pressure sensitive chamber and tire with the disk in its relief position is prevented by limited flow and/or positive flow shutoff through the chamber entrance or flow limiting orifice.
A tire fill valve having pressure relief and tire fill fluid gas flow limiting characteristics for use in filling tires to a predetermined pressure from a large flow capacity gas source delivering fill gas at a substantially greater pressure. Gases utilized typically are air or nitrogen. The valve of the invention is wheel mounted intermediate the gas pressurizing source and the tire gas valve inlet.
Tire fill gas from a high pressure high capacity source passes through a flow limiting orifice having a positive closure or shutoff member and passes through a pressure sensitive chamber as it enters the tire.
Chamber pressure is sensed by a spring loaded valve disk controlling relief or venting orifices. When fill pressure in the pressure sensing chamber exceeds a pre-determined value established by the valve disk area and valve disk springs, the disk lifts allowing the venting of the fill gas. Overpressurization of the pressure sensitive chamber and tire with the disk in its relief position is prevented by limited flow and/or positive flow shutoff through the chamber entrance or flow limiting orifice.
Description
TIRE INFLATION VALVE
HAVING OVERPRESSURE ,~ND FLON CONTROL 1 3 3 2 BACKGROUND OF THE INVENTION
Naintenance of adequate pressure in pneumatic tires is acknowledged as a critical requirement. In particular, high performance tires used on the wheels of modern aircraft of large size and heavy weight, which land at high ,3peeds have a critical requirement for accurate tire pressure.
In practice, in the maintenance of aircraft and other vehicles employing pneumatic tires such as highway trucks, and off the road vehicles, it i8 difficult and in some cases impossible to provide a regulated source of pressurizing gas to prevent over inflation. Also, high performance tires are oft~n inflated with nitrogen in order to reduce the lS oxidation of such tires at high temperatures. Nitrogen is further preferred because of the relatively large size of its molecule, in comparison to the other constituents of -~
air, which reduces tire leakage. A convenient and economic source of nitrogen is a high pressure tank wherein the delivered nitrogen is regulated from a typical tank pressure of 3,000 P.S.I.G., down to a tire delivery pressure, which typically is 300 P.S.I.G.
However, conventional tank regulators are of~en ~;
inaccurate in regulated output pressure, or fail to control delivery~ flow, or in many ca,ies limit the delivery flow to low values that result in excessive inflation time. Also in many cases, it is exigent to utilize unregulated sources, such as secondary~ tank, filled to an intermediate pressure from a primary source. These secondary tanks are in co~mon use and are economical, convenient and normally do not have an attached regulator. Tire filling or pressurization from an unregulated, secondary tank i8 essentially a cut and try operation. The usual technigue involves approaching a desired pressure by gauging and filling in small steps.
Since individual filling steps are by #feel n ~ over pressurization can easily occur.
The avoidance of over pressurization is critical -~
because it can cause excessive tire wear, 108,5 of structural integrity and in extreme cases explosive failure. In many cases these explosions have caused ~erious in~ury and de~th ~`
~fi~
, . ,. ,~': .
133~
to attending personnel. Unfortunatelyj the correct inflation pressure varies from vehicle to vehicle, and varies with location on a vehicle. Therefore, if a regulator is present on the pressure source, it constantly must be adjusted. Every time a regulator is ad~usted, there is a chance that it will be improperly ad~usted.
In view of the above mentioned difficulties, it is desireable to provide means to accurately regulate flow and delivery pre~sure for each individual tire. In this way correct inflation is assured.
These difficulties including Fiafety related difficulties encountered with presently used tire pressurizing valves are overcome through the use of Applicants' invention. As disclosed, Applicants' invention provides a small, light weight and economical self-contained pressure and flow limiting valve as a replacement for the conventional tire valve. In use, the valve of the invention provides pressure relief and limits flow there through when in the relief position through positive shutoff, providing a convenient means for rapidly maintaining tire pressure from unregulated sources.
It is therefore an object of this invention to provide ~-a pneumatic tire pressurization valve incorporating pressure relief at a predetermined pre~sure setting along with further overpressure protection through flow limiting and positive shutoff of the pressurizing gas when in the valve i8 in its relief position.
It is an additional ob~ect of this invention to provide a pneumatic tire fill valve having size, weight, and cost features which allow permanent mounting on individual tires~
thereby providing automatic control of tire pressurization without the need for a separate tire gauging operation.
It i8 a further ob~ect of this invention to provide a mall, lightweight and economically designed tire fill valve directly replacing the individual original tire valve, wherein correct tire pressure can be assured even when the tire fill gas source is of substantially greater pressure and flow capacity than the tire and the valve respectively.
It is yet an additional object of this in~ention to reduce the danger to maintenance personnel, engaged in , .
~ 3 ~
~-- pressurizing a high pressure pneumatic tire from a source having exces6ive pressure and flow capacity, through the use of a pressure and flow limiting valve continuou~ly attached to the tire. -The invention disclosed herein is a small, lightweight, economical tire fill valve of 6uch 6ize and weight that it can be permanently attached to the rim of a tire wheel having a pneumatic tire mounted thereon. Pressurizing gas from a source of high pressure and/or high flow capacity i8 admitted at the inlet of the valve through the usual spring loaded poppet type inlet valve, commonly known to the pneumatic industry as a Schrader valve. Pressurizing gas, which is admitted through the Schrader valve by the 15 depression of it6 inlat or operating rod by a typical air -~
chuck, passes through a flow limiting orifice containing a flow actuated poppet before entering a pressure sensitive chamber. The pressure sen6itive chamber i6 in constant fluid communication with the tire interior. Also in fluid 20 communication with the pressure 6ensitive chamber via a ~ -~
; multiplicity of orifices having a semicircular segmental cross section, i6 a valve disk. The valve disk cooperates with a vslve seat to normally seal an exhaust passage. The valve disk is force biased against the valve seat by a `~
series of spring washers which produce a preload force. The spring washers having a limited travel also limit lifting travel of the valve disk at a predetermined chamber pressure.
Nhen the pressure sensitive chamber reaches a pressure wherein the valve disk force approaches that of the spring washers, vertical movement or lifting of the valve disk ~ ~' aIlows gas flow from the chamber to exit ~he valve through ~`' an additional multiplicity of segmental relief passages ;,;~
~,~ `: ,,;
: . -:
. ~ , : ~, . .
~ 3 ~
- and/or vents arranged in a circular pattern circumferential of the inlet valve.
In operation, as the tire pre~6ure reaches the value determined by the force balance 6ystem, consisting of the valve disk and the spring washers, any increase in tire pressure above a predetermined value is prevented by disc lit and venting of the fill gas. In cases where ga~
sources having extremely high gas delivery are in u~e, overpressurization of the pressure sensitive chamber is prevented since exce6s flow through the flow limiting orifice is prevented by positive shutoff of flow sensitive poppet contained in the flow limiting orifice.
BRIEF DESCRIPTION OF THE D~AWINGS
Other ob~ects and advantages of the invention will become apparent upon reading the following detailed description and indicated reference to the drawings, in which:
Figure 1 is a side view of the finished valve, shown essentially full size. In particular, the upper or inlet valve, and the lower or tire attachment adapter are shown along with a hexagonal installation shoulder.
Figure 2 iB a cross-sectional view of the valve of the invention along the line 2-2 of Figure 1 (inlet cap ~i omitted). Figure 2 particularly shows the valve of the invention in its tire fill and non-relief position.
Figure 3 is a partial section at the line 2-2 of Pigure 1, showing the valve of the invention in overpressure and overflow relief position, particularly showing the flow sensitive poppet in positive shutoff.
Figure 4 is an additional section along the line 4-4 of Figure 2, particularly showing the semi-circular segmented or arcuate upper relief pa~sage~ of the valve of the invention.
~ :,, ~:
- 13320~
Figure S is a ~ection of the valve of the invention along the line 5-5 of Figure 2, particularly showing the semi-circular segmented or arcuate lower relief ports. ~-~
Figure 6 i8 a partial enlarged section of the valve of the invention along line 2-2 of Figure 1, particulsrly showing the gas lnlet adapter and flow sensitive poppet, in a fill and non-relief position.
While the pneumatic pressurization valve of this invention will be described in connection with a preferred embodiment, it is understood that the preferred embodiment is not intended to limit the invention to that embodiment. ~`
On the contrary it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended ~ ;
15 claims. -~
, ,;
DETAILED DESCRIPTION OF THE INVENTION
With particular reference to Figures 1 and 2, there i8 ' ; shown a pressure and flow relieving tire inflation or ~
20 pressurization valve 10 of the invention having a gas ~f ~- pressurization inlet 12 and a tire adapter and outlet end 14. The valve 10 al80 incorporates a hexagonal portion 16 l;
having safety or retention wire holes or ports 18 in keeping with commonly used wire antiturn techniques in u6e in the `-aircraft and/or automotive industries.
With particular reference to Figure 2, the tire pressurization and relief valve 10 includes an outer shell ;~
~ or housing 20. Internal of the outer shell or housing 20 at ~; ;
;~ its inlet end 22 is the hexagonal portion 16 suitable for proper installation, and a gas inlet adapter 24. ~he outer shell 20 further includes at its outlet end 14, a threaded outlet or tire adapter 26 having an outlet port 28 suitable for direct mount~ng on the rim inlet of the wheel mounting a ;~
pressurized pneumatic tire (not shown). Intermediate of the .,. ~, - 5 - ~
" .
':'.,-' ~332Q~ ~J
outlet port 28 and gas inlet adaptex 24 i~ a valve spool 30 incorporating a spool spring chamber and/or relief passage 32 that contains an annular spring and/or spring washers 34 and an annular valve disk 36. The spring washer~ 34 and valve disk 36 are concentric with and cixcumferentially disposed around a lower cylindrically shaped portion 38 of the gas inlet adapter 24.
A lower portion 40 of the valve spool 30 further incorporates a plurality of segmental, semi-circular flow passages or orifices 42 each having a raised lip seat 44 facing a concentric valve disk seal 46 for sealing cooperation therewith.
The lower ends 48 of the lower relief passages 42 defined by the valve spool 30 terminate in a pressure sensing chamber 50 further defined by the lower portion 40 of the valve spool 30 and the upper 6urface 52 of a deflector disk 54. The upper surface 52 of the deflection disk 54 forms the lower surface of the pressure sen~ing chamber 50 and includes tire fill ports 58 passing therethrough. The fill ports 58 fluid communicate the pressure sensing chamber 50 and the interior of the tire to be filled via the valve outlet port 28. A suitable pressure seal 60 i8 positioned between the valve housing 20 and the lower corners 62 and 64 of the valve spool 30, and deflector ;~
disc 54 respectively.
As indicated above, internal and of surrounded by the hexagonal portion 16 and valve spool 30 is a gas inlet adapter 24. The adapter 24 includes a valve inlet port 66 having external threads 68 for incorporation of a dust cover or additional leak preventing cap 70 (reference Figure 1).
The inlet port 66 threadably engages a tire fill valve 72 of a conventional type, commonly known as a "Schrader~ valve having its inlet 74 ad~acent the inlet port 66 and it8 outlet 76 internal of the gas inlet adapter flow passage or ,~
~s ~ . .
133~0~` ~
cavity 78. The lower end 80 of the flow passage 78 defines and/or i8 terminated by a control orifice 80 80 that g~s pressure communicates between the passage or cavity 78 and the pressure sensing chamber 50.
As shown in Figure 6, a flow sensitive poppet 84 i~
mounted in the flow pa~sage 78. The poppet stem 86 is centrally maintained in longitudinal alignment with the lower base 88 of the inlet adapter pa~sage 78. A conical spring 90 provides al~gnment and vertical preload force to the poppet 84, maintaining the poppet closure end 92 with its alignment pin 94 above a cooperating seat 96.
Also internal of the housing hexagonal portion 16 i8 a plurality of concentrically disposed fill gas exit ports 98 ::.
each having a semi-circular arc like cross Rection. The 15 exit ports 98 fluid communicate the ~pool spring chamber 32 ..
with ambient air. An annular circular dust cover 100 of flexible elastomeric material such as natural rubber or ':~
neoprene provides protection to the ports 98 from external contamination, readily allowing venting of the pressurizing gas during relief operation of the valve 10.
In operation, gas from a high pressure and/or high : :
capacity source is introduced through a conventional air chuck (not ~hown) having a deflector tongue for depressing the inlet or Schrader valve actuating pin 102. As those skilled in the art will readily recognize, operation of the Schrader valve 72 i8 such that depressing the pin-102 moves the lower member or poppet 104 vertically downwardly, opening a concentric port (not shown) internal of the Schrader valve 72, and admitting pres~urized fill ga~ to the upper end of gas.inlet adaptex flow passage or chamber 78.
` ! Under fill conditions at pressures below valve calibration as shown in Figure 2, the pressurization gas flows through the chamber 78, seat 96, and the flow control orifice 82 into the pre~sure sen~ing chamber 50 through the tire fill -~ 7 - :
. .
... . .
1332,~
ports 58 and into the tire to be inflated through the outlet port 28.
At the completion of the filling process, or for any other reason when the pres~ure in chamber 50 reaches a value which act6 on the under~ide 106 of the valve di~k 36 via the orifices 42 in the valve spool 30 to exceed the predetermined preload of the ~pring washers 34, the disk 36 ~ :
lift6, as indicated in the right-half portion of Figure 3, allowing relief flow of the pres6urizing gas to exit the valve 10 via the 6pring chamber 32 and exit ports 98. As discussed above, the flexible dust cover 100 i6 easily deflected by the exiting gas and as shown in the right-half of Figure 2, allows easy venting. Venting of the fill gas ~;
: under relief conditions limits the pressurization of the ~:
tire being filled to a predetermined value. Typically~ fill pressure is limited to 300 P.S.I.G. and hence the pressure causing lifting of the disk 36 is 300 P.S.I.G.
: A highly important feature of the disclosed invention :
arises from the fact that under conditions where the fill source pressure and/or capacity for one reason or another is a multiple or even an order of magnitude greater than the ::
desired tire maximum, venting of a conventional relief device would still result in over pressuring of the tires since the restricted flow through the exit ports 98 would 25 not limit the pressure possible in the chamber 50 sufficiently to prevent overpressure from existing at the tire inlet or valve outlet port 28. However, Applicants have discovered that inclusion of the flow sensitive poppet :~
~: 84, maintained in an open or flowing position as shown in 30 Figures 2 and 6, where the poppet 84 is maintained away from " bhe valve $eat 96 by the preload or bias force of the conical spring 90, controls tire filling gas flow through :~
said seat 96 for both relief and normal flow conditions of ~ ~;
~: the valve 10. ~ ~i ~ .':' '' : : - 8 - .;
.:.
. .
:
1 3 ~
In operation, ~hould fill pressure in chamber 50 exceed a predetermined relief pressure, venting fill gas through ports 98 reduces filling gas pressure entering the tire at the outlet port 28. However if the pressure differential 5 between the poppet 84 and the outlet port 28 i8 too high, ;
venting through ports 98 may be insufficient to hold the pressure in chamber 50 below a predetermined value, ~-typically 20~ in excess of the desired tire pressure. In -~
this instance, the poppet 84 contained in the flow pas~agei ;~
10 i8 of the gas inlet adapter 24, moves downwardly due to the ~-flow induced pressure drops across the poppet head 108, thereby contacting the seat 96 and reducing the pressure within the chamber 50 and the flow into the tire through the outlet port 28. Control of the downward motion of the poppet 84 and the quantity of flow past ~he seat 96 i8 aided by the flow drag of peripheral grooves 110 in the poppet head 108. An alignment pin 112 extending from the poppet 104 into the poppet head 108 centers the head 108 in the ;
flow passage 78.
Thus it ~ apparent that there has been provided in accordance with the invention the tire fill valve that fully satisfies the ob~ects, aims and advantages as set forth above. While the tire fill valve disclosed here has been described in con~unction with specific embodiments thereof, 25 it i8 evident that in the alternativeæ modifications end -~
variations will be apparent to those skilled in the art in the light of the foregoing description. Accordingly it i~
intended to e~brace all such alternatives, modifications and variations as fall within the spirit and broad scope of ~he 30 appended claims. `
'. :
. g ~
.''~,~ ' ;'
HAVING OVERPRESSURE ,~ND FLON CONTROL 1 3 3 2 BACKGROUND OF THE INVENTION
Naintenance of adequate pressure in pneumatic tires is acknowledged as a critical requirement. In particular, high performance tires used on the wheels of modern aircraft of large size and heavy weight, which land at high ,3peeds have a critical requirement for accurate tire pressure.
In practice, in the maintenance of aircraft and other vehicles employing pneumatic tires such as highway trucks, and off the road vehicles, it i8 difficult and in some cases impossible to provide a regulated source of pressurizing gas to prevent over inflation. Also, high performance tires are oft~n inflated with nitrogen in order to reduce the lS oxidation of such tires at high temperatures. Nitrogen is further preferred because of the relatively large size of its molecule, in comparison to the other constituents of -~
air, which reduces tire leakage. A convenient and economic source of nitrogen is a high pressure tank wherein the delivered nitrogen is regulated from a typical tank pressure of 3,000 P.S.I.G., down to a tire delivery pressure, which typically is 300 P.S.I.G.
However, conventional tank regulators are of~en ~;
inaccurate in regulated output pressure, or fail to control delivery~ flow, or in many ca,ies limit the delivery flow to low values that result in excessive inflation time. Also in many cases, it is exigent to utilize unregulated sources, such as secondary~ tank, filled to an intermediate pressure from a primary source. These secondary tanks are in co~mon use and are economical, convenient and normally do not have an attached regulator. Tire filling or pressurization from an unregulated, secondary tank i8 essentially a cut and try operation. The usual technigue involves approaching a desired pressure by gauging and filling in small steps.
Since individual filling steps are by #feel n ~ over pressurization can easily occur.
The avoidance of over pressurization is critical -~
because it can cause excessive tire wear, 108,5 of structural integrity and in extreme cases explosive failure. In many cases these explosions have caused ~erious in~ury and de~th ~`
~fi~
, . ,. ,~': .
133~
to attending personnel. Unfortunatelyj the correct inflation pressure varies from vehicle to vehicle, and varies with location on a vehicle. Therefore, if a regulator is present on the pressure source, it constantly must be adjusted. Every time a regulator is ad~usted, there is a chance that it will be improperly ad~usted.
In view of the above mentioned difficulties, it is desireable to provide means to accurately regulate flow and delivery pre~sure for each individual tire. In this way correct inflation is assured.
These difficulties including Fiafety related difficulties encountered with presently used tire pressurizing valves are overcome through the use of Applicants' invention. As disclosed, Applicants' invention provides a small, light weight and economical self-contained pressure and flow limiting valve as a replacement for the conventional tire valve. In use, the valve of the invention provides pressure relief and limits flow there through when in the relief position through positive shutoff, providing a convenient means for rapidly maintaining tire pressure from unregulated sources.
It is therefore an object of this invention to provide ~-a pneumatic tire pressurization valve incorporating pressure relief at a predetermined pre~sure setting along with further overpressure protection through flow limiting and positive shutoff of the pressurizing gas when in the valve i8 in its relief position.
It is an additional ob~ect of this invention to provide a pneumatic tire fill valve having size, weight, and cost features which allow permanent mounting on individual tires~
thereby providing automatic control of tire pressurization without the need for a separate tire gauging operation.
It i8 a further ob~ect of this invention to provide a mall, lightweight and economically designed tire fill valve directly replacing the individual original tire valve, wherein correct tire pressure can be assured even when the tire fill gas source is of substantially greater pressure and flow capacity than the tire and the valve respectively.
It is yet an additional object of this in~ention to reduce the danger to maintenance personnel, engaged in , .
~ 3 ~
~-- pressurizing a high pressure pneumatic tire from a source having exces6ive pressure and flow capacity, through the use of a pressure and flow limiting valve continuou~ly attached to the tire. -The invention disclosed herein is a small, lightweight, economical tire fill valve of 6uch 6ize and weight that it can be permanently attached to the rim of a tire wheel having a pneumatic tire mounted thereon. Pressurizing gas from a source of high pressure and/or high flow capacity i8 admitted at the inlet of the valve through the usual spring loaded poppet type inlet valve, commonly known to the pneumatic industry as a Schrader valve. Pressurizing gas, which is admitted through the Schrader valve by the 15 depression of it6 inlat or operating rod by a typical air -~
chuck, passes through a flow limiting orifice containing a flow actuated poppet before entering a pressure sensitive chamber. The pressure sen6itive chamber i6 in constant fluid communication with the tire interior. Also in fluid 20 communication with the pressure 6ensitive chamber via a ~ -~
; multiplicity of orifices having a semicircular segmental cross section, i6 a valve disk. The valve disk cooperates with a vslve seat to normally seal an exhaust passage. The valve disk is force biased against the valve seat by a `~
series of spring washers which produce a preload force. The spring washers having a limited travel also limit lifting travel of the valve disk at a predetermined chamber pressure.
Nhen the pressure sensitive chamber reaches a pressure wherein the valve disk force approaches that of the spring washers, vertical movement or lifting of the valve disk ~ ~' aIlows gas flow from the chamber to exit ~he valve through ~`' an additional multiplicity of segmental relief passages ;,;~
~,~ `: ,,;
: . -:
. ~ , : ~, . .
~ 3 ~
- and/or vents arranged in a circular pattern circumferential of the inlet valve.
In operation, as the tire pre~6ure reaches the value determined by the force balance 6ystem, consisting of the valve disk and the spring washers, any increase in tire pressure above a predetermined value is prevented by disc lit and venting of the fill gas. In cases where ga~
sources having extremely high gas delivery are in u~e, overpressurization of the pressure sensitive chamber is prevented since exce6s flow through the flow limiting orifice is prevented by positive shutoff of flow sensitive poppet contained in the flow limiting orifice.
BRIEF DESCRIPTION OF THE D~AWINGS
Other ob~ects and advantages of the invention will become apparent upon reading the following detailed description and indicated reference to the drawings, in which:
Figure 1 is a side view of the finished valve, shown essentially full size. In particular, the upper or inlet valve, and the lower or tire attachment adapter are shown along with a hexagonal installation shoulder.
Figure 2 iB a cross-sectional view of the valve of the invention along the line 2-2 of Figure 1 (inlet cap ~i omitted). Figure 2 particularly shows the valve of the invention in its tire fill and non-relief position.
Figure 3 is a partial section at the line 2-2 of Pigure 1, showing the valve of the invention in overpressure and overflow relief position, particularly showing the flow sensitive poppet in positive shutoff.
Figure 4 is an additional section along the line 4-4 of Figure 2, particularly showing the semi-circular segmented or arcuate upper relief pa~sage~ of the valve of the invention.
~ :,, ~:
- 13320~
Figure S is a ~ection of the valve of the invention along the line 5-5 of Figure 2, particularly showing the semi-circular segmented or arcuate lower relief ports. ~-~
Figure 6 i8 a partial enlarged section of the valve of the invention along line 2-2 of Figure 1, particulsrly showing the gas lnlet adapter and flow sensitive poppet, in a fill and non-relief position.
While the pneumatic pressurization valve of this invention will be described in connection with a preferred embodiment, it is understood that the preferred embodiment is not intended to limit the invention to that embodiment. ~`
On the contrary it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended ~ ;
15 claims. -~
, ,;
DETAILED DESCRIPTION OF THE INVENTION
With particular reference to Figures 1 and 2, there i8 ' ; shown a pressure and flow relieving tire inflation or ~
20 pressurization valve 10 of the invention having a gas ~f ~- pressurization inlet 12 and a tire adapter and outlet end 14. The valve 10 al80 incorporates a hexagonal portion 16 l;
having safety or retention wire holes or ports 18 in keeping with commonly used wire antiturn techniques in u6e in the `-aircraft and/or automotive industries.
With particular reference to Figure 2, the tire pressurization and relief valve 10 includes an outer shell ;~
~ or housing 20. Internal of the outer shell or housing 20 at ~; ;
;~ its inlet end 22 is the hexagonal portion 16 suitable for proper installation, and a gas inlet adapter 24. ~he outer shell 20 further includes at its outlet end 14, a threaded outlet or tire adapter 26 having an outlet port 28 suitable for direct mount~ng on the rim inlet of the wheel mounting a ;~
pressurized pneumatic tire (not shown). Intermediate of the .,. ~, - 5 - ~
" .
':'.,-' ~332Q~ ~J
outlet port 28 and gas inlet adaptex 24 i~ a valve spool 30 incorporating a spool spring chamber and/or relief passage 32 that contains an annular spring and/or spring washers 34 and an annular valve disk 36. The spring washer~ 34 and valve disk 36 are concentric with and cixcumferentially disposed around a lower cylindrically shaped portion 38 of the gas inlet adapter 24.
A lower portion 40 of the valve spool 30 further incorporates a plurality of segmental, semi-circular flow passages or orifices 42 each having a raised lip seat 44 facing a concentric valve disk seal 46 for sealing cooperation therewith.
The lower ends 48 of the lower relief passages 42 defined by the valve spool 30 terminate in a pressure sensing chamber 50 further defined by the lower portion 40 of the valve spool 30 and the upper 6urface 52 of a deflector disk 54. The upper surface 52 of the deflection disk 54 forms the lower surface of the pressure sen~ing chamber 50 and includes tire fill ports 58 passing therethrough. The fill ports 58 fluid communicate the pressure sensing chamber 50 and the interior of the tire to be filled via the valve outlet port 28. A suitable pressure seal 60 i8 positioned between the valve housing 20 and the lower corners 62 and 64 of the valve spool 30, and deflector ;~
disc 54 respectively.
As indicated above, internal and of surrounded by the hexagonal portion 16 and valve spool 30 is a gas inlet adapter 24. The adapter 24 includes a valve inlet port 66 having external threads 68 for incorporation of a dust cover or additional leak preventing cap 70 (reference Figure 1).
The inlet port 66 threadably engages a tire fill valve 72 of a conventional type, commonly known as a "Schrader~ valve having its inlet 74 ad~acent the inlet port 66 and it8 outlet 76 internal of the gas inlet adapter flow passage or ,~
~s ~ . .
133~0~` ~
cavity 78. The lower end 80 of the flow passage 78 defines and/or i8 terminated by a control orifice 80 80 that g~s pressure communicates between the passage or cavity 78 and the pressure sensing chamber 50.
As shown in Figure 6, a flow sensitive poppet 84 i~
mounted in the flow pa~sage 78. The poppet stem 86 is centrally maintained in longitudinal alignment with the lower base 88 of the inlet adapter pa~sage 78. A conical spring 90 provides al~gnment and vertical preload force to the poppet 84, maintaining the poppet closure end 92 with its alignment pin 94 above a cooperating seat 96.
Also internal of the housing hexagonal portion 16 i8 a plurality of concentrically disposed fill gas exit ports 98 ::.
each having a semi-circular arc like cross Rection. The 15 exit ports 98 fluid communicate the ~pool spring chamber 32 ..
with ambient air. An annular circular dust cover 100 of flexible elastomeric material such as natural rubber or ':~
neoprene provides protection to the ports 98 from external contamination, readily allowing venting of the pressurizing gas during relief operation of the valve 10.
In operation, gas from a high pressure and/or high : :
capacity source is introduced through a conventional air chuck (not ~hown) having a deflector tongue for depressing the inlet or Schrader valve actuating pin 102. As those skilled in the art will readily recognize, operation of the Schrader valve 72 i8 such that depressing the pin-102 moves the lower member or poppet 104 vertically downwardly, opening a concentric port (not shown) internal of the Schrader valve 72, and admitting pres~urized fill ga~ to the upper end of gas.inlet adaptex flow passage or chamber 78.
` ! Under fill conditions at pressures below valve calibration as shown in Figure 2, the pressurization gas flows through the chamber 78, seat 96, and the flow control orifice 82 into the pre~sure sen~ing chamber 50 through the tire fill -~ 7 - :
. .
... . .
1332,~
ports 58 and into the tire to be inflated through the outlet port 28.
At the completion of the filling process, or for any other reason when the pres~ure in chamber 50 reaches a value which act6 on the under~ide 106 of the valve di~k 36 via the orifices 42 in the valve spool 30 to exceed the predetermined preload of the ~pring washers 34, the disk 36 ~ :
lift6, as indicated in the right-half portion of Figure 3, allowing relief flow of the pres6urizing gas to exit the valve 10 via the 6pring chamber 32 and exit ports 98. As discussed above, the flexible dust cover 100 i6 easily deflected by the exiting gas and as shown in the right-half of Figure 2, allows easy venting. Venting of the fill gas ~;
: under relief conditions limits the pressurization of the ~:
tire being filled to a predetermined value. Typically~ fill pressure is limited to 300 P.S.I.G. and hence the pressure causing lifting of the disk 36 is 300 P.S.I.G.
: A highly important feature of the disclosed invention :
arises from the fact that under conditions where the fill source pressure and/or capacity for one reason or another is a multiple or even an order of magnitude greater than the ::
desired tire maximum, venting of a conventional relief device would still result in over pressuring of the tires since the restricted flow through the exit ports 98 would 25 not limit the pressure possible in the chamber 50 sufficiently to prevent overpressure from existing at the tire inlet or valve outlet port 28. However, Applicants have discovered that inclusion of the flow sensitive poppet :~
~: 84, maintained in an open or flowing position as shown in 30 Figures 2 and 6, where the poppet 84 is maintained away from " bhe valve $eat 96 by the preload or bias force of the conical spring 90, controls tire filling gas flow through :~
said seat 96 for both relief and normal flow conditions of ~ ~;
~: the valve 10. ~ ~i ~ .':' '' : : - 8 - .;
.:.
. .
:
1 3 ~
In operation, ~hould fill pressure in chamber 50 exceed a predetermined relief pressure, venting fill gas through ports 98 reduces filling gas pressure entering the tire at the outlet port 28. However if the pressure differential 5 between the poppet 84 and the outlet port 28 i8 too high, ;
venting through ports 98 may be insufficient to hold the pressure in chamber 50 below a predetermined value, ~-typically 20~ in excess of the desired tire pressure. In -~
this instance, the poppet 84 contained in the flow pas~agei ;~
10 i8 of the gas inlet adapter 24, moves downwardly due to the ~-flow induced pressure drops across the poppet head 108, thereby contacting the seat 96 and reducing the pressure within the chamber 50 and the flow into the tire through the outlet port 28. Control of the downward motion of the poppet 84 and the quantity of flow past ~he seat 96 i8 aided by the flow drag of peripheral grooves 110 in the poppet head 108. An alignment pin 112 extending from the poppet 104 into the poppet head 108 centers the head 108 in the ;
flow passage 78.
Thus it ~ apparent that there has been provided in accordance with the invention the tire fill valve that fully satisfies the ob~ects, aims and advantages as set forth above. While the tire fill valve disclosed here has been described in con~unction with specific embodiments thereof, 25 it i8 evident that in the alternativeæ modifications end -~
variations will be apparent to those skilled in the art in the light of the foregoing description. Accordingly it i~
intended to e~brace all such alternatives, modifications and variations as fall within the spirit and broad scope of ~he 30 appended claims. `
'. :
. g ~
.''~,~ ' ;'
Claims (20)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A wheel mounted gas fill valve for pressurizing a pneumatic tire above ambient pressure having:
a valve housing;
an inlet gas passage in said housing having;
a first end adapted for admitting pressurizing gas from a high pressure gas source; and a second end;
an inlet Schrader valve in said second end of said inlet gas passage oriented to normally block flow from said second end to said first end unless mechanically opened;
an outlet port in said housing distal said inlet gas passage, adapted for connection to a tire for supplying pressurized gas to the tire;
a flow limiting orifice in flow communication with said inlet gas passage;
a pressure sensing cavity in said housing, said cavity communicating said flow limiting orifice and outlet port;
valve means capable of venting said pressure sensing cavity to ambient; and means responsive to a predetermined difference in pressure between ambient pressure and pressure in said pressure sensing cavity to open said valve means, whereby pressure in said pressure sensing cavity in excess of a predetermined absolute value above ambient pressure is limited so that gas pressure at said outlet port is limited to a predetermined maximum pressure above ambient no matter what pressure is present at said inlet passage.
a valve housing;
an inlet gas passage in said housing having;
a first end adapted for admitting pressurizing gas from a high pressure gas source; and a second end;
an inlet Schrader valve in said second end of said inlet gas passage oriented to normally block flow from said second end to said first end unless mechanically opened;
an outlet port in said housing distal said inlet gas passage, adapted for connection to a tire for supplying pressurized gas to the tire;
a flow limiting orifice in flow communication with said inlet gas passage;
a pressure sensing cavity in said housing, said cavity communicating said flow limiting orifice and outlet port;
valve means capable of venting said pressure sensing cavity to ambient; and means responsive to a predetermined difference in pressure between ambient pressure and pressure in said pressure sensing cavity to open said valve means, whereby pressure in said pressure sensing cavity in excess of a predetermined absolute value above ambient pressure is limited so that gas pressure at said outlet port is limited to a predetermined maximum pressure above ambient no matter what pressure is present at said inlet passage.
2. The gas fill valve of Claim 1 wherein said flow limiting orifice further comprises:
a flow sensitive poppet;
an exit end distal said inlet valve;
a seat; and means mounting said poppet for reciprocal motion, said mounting means allowing gas flow through said flow limiting orifice for gas flows below a predetermined value, and said poppet and seat cooperating to restrict flow through said orifice for gas flow through said passage in excess of a predetermined value, whereby excess pressurizing gas flow into said tire is prevented.
a flow sensitive poppet;
an exit end distal said inlet valve;
a seat; and means mounting said poppet for reciprocal motion, said mounting means allowing gas flow through said flow limiting orifice for gas flows below a predetermined value, and said poppet and seat cooperating to restrict flow through said orifice for gas flow through said passage in excess of a predetermined value, whereby excess pressurizing gas flow into said tire is prevented.
3. A compact tire fill valve with overpressure relief including:
a valve body having:
a first end; and an opposite second end;
an inlet port positioned at said first end of said valve body and adapted for pneumatic connection to a high pressure gas source by means of a removable chuck;
a first outlet port positioned at said second end of said valve body and adapted for pneumatic connection to a tire having:
a plurality of first outlet port orifices therein having a total flow cross-section of a fixed amount;
a poppet valve sealably positioned in said inlet port to normally allow pressurized gas to pass from said first end toward said second end;
a pressure sensing chamber positioned between said poppet valve and said first outlet port;
flow restricting means positioned between said poppet valve and said pressure sensing chamber having a maximum flow path cross-section of a predetermined amount which is less than said total fixed amount of flow cross-section of said plurality of first outlet port orifices;
a plurality of second outlet ports in pneumatic connection to atmospheric pressure, said second outlet ports being concentrically positioned around said poppet valve and being larger in total cross-sectional area for flow than said total fixed amount of flow cross-section of said plurality of first outlet port orifices;
a relief ring having:
a first radial side in pneumatic connection to said plurality of second outlet ports; and a second opposite seal radial side;
compression spring means positioned to apply a predetermined force to said first radial side of said relief ring; and a plurality of orifices extending from said pressure sensing chamber to said second seal radial side of said relief ring that is forced into sealing contact therewith by said compression spring, whereby a pressure in said pressure sensing chamber predetermined by said predetermined force, moves said relief ring away from said plurality of orifices to relieve pressure therewithin through said plurality of orifices and said second outlet ports to the atmosphere.
a valve body having:
a first end; and an opposite second end;
an inlet port positioned at said first end of said valve body and adapted for pneumatic connection to a high pressure gas source by means of a removable chuck;
a first outlet port positioned at said second end of said valve body and adapted for pneumatic connection to a tire having:
a plurality of first outlet port orifices therein having a total flow cross-section of a fixed amount;
a poppet valve sealably positioned in said inlet port to normally allow pressurized gas to pass from said first end toward said second end;
a pressure sensing chamber positioned between said poppet valve and said first outlet port;
flow restricting means positioned between said poppet valve and said pressure sensing chamber having a maximum flow path cross-section of a predetermined amount which is less than said total fixed amount of flow cross-section of said plurality of first outlet port orifices;
a plurality of second outlet ports in pneumatic connection to atmospheric pressure, said second outlet ports being concentrically positioned around said poppet valve and being larger in total cross-sectional area for flow than said total fixed amount of flow cross-section of said plurality of first outlet port orifices;
a relief ring having:
a first radial side in pneumatic connection to said plurality of second outlet ports; and a second opposite seal radial side;
compression spring means positioned to apply a predetermined force to said first radial side of said relief ring; and a plurality of orifices extending from said pressure sensing chamber to said second seal radial side of said relief ring that is forced into sealing contact therewith by said compression spring, whereby a pressure in said pressure sensing chamber predetermined by said predetermined force, moves said relief ring away from said plurality of orifices to relieve pressure therewithin through said plurality of orifices and said second outlet ports to the atmosphere.
4. The valve as defined in Claim 3 wherein each of said plurality of second outlet ports have:
a first end in pneumatic connection to said first radial side of said relief ring; and a second end exposed to the atmosphere, said valve further including:
a ring shaped flapper covering said second ends of said plurality of second outlet ports to prevent debris from entering said second outlet ports.
a first end in pneumatic connection to said first radial side of said relief ring; and a second end exposed to the atmosphere, said valve further including:
a ring shaped flapper covering said second ends of said plurality of second outlet ports to prevent debris from entering said second outlet ports.
5. The valve as defined in Claim 3 wherein said flow restricting means include:
a restriction chamber adjacent said poppet valve; and a restriction passageway which connects to said pressure sensing chamber.
a restriction chamber adjacent said poppet valve; and a restriction passageway which connects to said pressure sensing chamber.
6. The valve as defined in Claim 5 wherein said flow restricting means also include:
a spring loaded movable restriction member located in said restriction chamber, said movable restriction member being responsive to flow velocities therepast to move toward said flow restriction passageway in response to high flow velocities of gas passing toward said pressure sensing chamber to further restrict gas flow in response thereto.
a spring loaded movable restriction member located in said restriction chamber, said movable restriction member being responsive to flow velocities therepast to move toward said flow restriction passageway in response to high flow velocities of gas passing toward said pressure sensing chamber to further restrict gas flow in response thereto.
7. The valve as defined in Claim 6 wherein said flow restricting means also includes:
a nipple having a cylindrical outer surface and in which said restriction chamber is formed, said relief ring being positioned on said cylindrical outer surface for longitudinal sliding thereon in response to overpressures in said pressure sensing chamber.
a nipple having a cylindrical outer surface and in which said restriction chamber is formed, said relief ring being positioned on said cylindrical outer surface for longitudinal sliding thereon in response to overpressures in said pressure sensing chamber.
8. The valve as defined in Claim 7 wherein said second opposite seal radial side of said relief ring includes:
a seal ring positioned thereon facing said plurality of orifices to form a releasable seal therewith.
a seal ring positioned thereon facing said plurality of orifices to form a releasable seal therewith.
9. The valve as defined in Claim 8 wherein said plurality of orifices each include:
a circular lip thereabout facing said seal ring for sealing contact therewith.
a circular lip thereabout facing said seal ring for sealing contact therewith.
10. The valve as defined in Claim 9 wherein said second opposite seal radial side of said relief ring includes:
a ring shaped lip positioned to restrict outward radial movement of said seal ring.
a ring shaped lip positioned to restrict outward radial movement of said seal ring.
11. The valve as defined in Claim 10 wherein said poppet valve is a Schrader type valve.
12. The valve as defined in Claim 3 wherein said second opposite seal radial side of said relief ring includes:
a seal ring positioned thereon facing said plurality of orifices to form a releasable seal therewith.
a seal ring positioned thereon facing said plurality of orifices to form a releasable seal therewith.
13. The valve as defined in Claim 12 wherein said plurality of orifices each include:
a circular lip thereabout facing said seal ring for sealing contact therewith.
a circular lip thereabout facing said seal ring for sealing contact therewith.
14. The valve as defined in Claim 12 wherein said second opposite seal radial side of said relief ring includes:
a ring shaped lip positioned to restrict outward radial movement of said real ring.
a ring shaped lip positioned to restrict outward radial movement of said real ring.
15. A compact tire fill valve with overpressure relief including:
a valve body having:
a first end; and an opposite second end;
an inlet port positioned at said first end of said valve body and adapted for pneumatic connection to a high pressure gas source;
a first outlet port positioned at said second end of said valve body and adapted for pneumatic connection to a tire, said first outlet port having:
at least one first outlet port orifices therein having a total flow cross-section of a fixed amount;
a poppet valve sealably positioned in said inlet port which in response to differential pressure thereacross normally allows gas to pass from said first end toward said second end and allows gas to pass in the opposite direction only in response to a mechanical input thereto;
a pressure sensing chamber positioned between said poppet valve and said first outlet port;
flow restricting means positioned between said poppet valve and said pressure sensing chamber having a maximum flow path cross-section of a predetermined amount which is less than said total fixed amount of flow cross-section of said at least one first outlet port orifices;
at least two second outlet ports in pneumatic connection to atmospheric pressure, said second outlet ports being concentrically positioned around said poppet valve and being larger in total cross-sectional area for flow than said total fixed amount of flow cross-section of said at least one first outlet port orifices;
a relief ring having:
a first side in pneumatic communication to said plurality of second outlet ports; and a second opposite radial side;
spring means positioned to apply predetermined force to said first side of said relief ring toward said second end of said valve body; and at least two orifices extending from said pressure sensing chamber to said second radial side of said relief ring that is forced into sealing contact therewith by said compression spring, whereby a pressure in said pressure sensing chamber predetermined by said predetermined force, moves said relief ring away from said at least two orifices to relieve pressure therewithin through said at least two orifices and said second outlet ports to the atmosphere.
a valve body having:
a first end; and an opposite second end;
an inlet port positioned at said first end of said valve body and adapted for pneumatic connection to a high pressure gas source;
a first outlet port positioned at said second end of said valve body and adapted for pneumatic connection to a tire, said first outlet port having:
at least one first outlet port orifices therein having a total flow cross-section of a fixed amount;
a poppet valve sealably positioned in said inlet port which in response to differential pressure thereacross normally allows gas to pass from said first end toward said second end and allows gas to pass in the opposite direction only in response to a mechanical input thereto;
a pressure sensing chamber positioned between said poppet valve and said first outlet port;
flow restricting means positioned between said poppet valve and said pressure sensing chamber having a maximum flow path cross-section of a predetermined amount which is less than said total fixed amount of flow cross-section of said at least one first outlet port orifices;
at least two second outlet ports in pneumatic connection to atmospheric pressure, said second outlet ports being concentrically positioned around said poppet valve and being larger in total cross-sectional area for flow than said total fixed amount of flow cross-section of said at least one first outlet port orifices;
a relief ring having:
a first side in pneumatic communication to said plurality of second outlet ports; and a second opposite radial side;
spring means positioned to apply predetermined force to said first side of said relief ring toward said second end of said valve body; and at least two orifices extending from said pressure sensing chamber to said second radial side of said relief ring that is forced into sealing contact therewith by said compression spring, whereby a pressure in said pressure sensing chamber predetermined by said predetermined force, moves said relief ring away from said at least two orifices to relieve pressure therewithin through said at least two orifices and said second outlet ports to the atmosphere.
16. The valve as defined in Claim 15 wherein said flow restricting means include:
a restriction chamber; and a restriction passageway which pneumatically connects said restriction chamber to said pressure sensing chamber.
a restriction chamber; and a restriction passageway which pneumatically connects said restriction chamber to said pressure sensing chamber.
17. The valve as defined in Claim 16 wherein said flow restricting means also include:
a spring loaded movable restriction member located in said restriction chamber, said movable restriction member being responsive to flow velocities therepast to move toward said flow restriction passageway in response to high flow velocities of gas passing toward said pressure sensing chamber to further restrict gas flow in response thereto.
a spring loaded movable restriction member located in said restriction chamber, said movable restriction member being responsive to flow velocities therepast to move toward said flow restriction passageway in response to high flow velocities of gas passing toward said pressure sensing chamber to further restrict gas flow in response thereto.
18. The valve as defined in Claim 17 wherein said flow restricting means also include:
a nipple having a cylindrical outer surface and in which said restriction chamber is formed, said relief ring being positioned on said cylindrical outer surface for longitudinal sliding therealong in response to overpressures in said pressure sensing chamber.
a nipple having a cylindrical outer surface and in which said restriction chamber is formed, said relief ring being positioned on said cylindrical outer surface for longitudinal sliding therealong in response to overpressures in said pressure sensing chamber.
13. The valve as defined in Claim 18 wherein said second opposite radial side of said relief ring includes:
a seal member positioned thereon facing said at least two orifices to form a releasable seal therewith.
a seal member positioned thereon facing said at least two orifices to form a releasable seal therewith.
20. The valve as defined in Claim 19 wherein said at least two orifices each include:
a circular lip thereabout facing said seal member for sealing contact therewith.
a circular lip thereabout facing said seal member for sealing contact therewith.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24247788A | 1988-09-09 | 1988-09-09 | |
| US242,477 | 1988-09-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1332042C true CA1332042C (en) | 1994-09-20 |
Family
ID=22914926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 610491 Expired - Lifetime CA1332042C (en) | 1988-09-09 | 1989-09-06 | Tire inflation valve having overpressure and flow control |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1332042C (en) |
| WO (1) | WO1990002662A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9116031D0 (en) * | 1991-07-25 | 1991-09-11 | Matrow Ltd | Pressurised articles and valves for use in pressurising articles |
| AU739467B2 (en) * | 1998-10-28 | 2001-10-11 | Avalco Pty Limited | A pressure cutoff valve |
| AUPP676798A0 (en) * | 1998-10-28 | 1998-11-19 | Sampson, Ronald Spencer | Automatic cut-off pneumatic tyre valve |
| GB2356704A (en) * | 1999-11-25 | 2001-05-30 | Transense Technologies Plc | Device for setting gas pressure levels |
| US7530379B1 (en) * | 2002-04-10 | 2009-05-12 | John Henry Becker | Tire inflation system |
| US6772812B1 (en) * | 2003-03-25 | 2004-08-10 | Autoliv Asp, Inc. | Dual-function tire inlet valve |
| KR101309646B1 (en) * | 2011-09-28 | 2013-09-17 | 주식회사 포스코 | Safety valve for detecting pressure drop |
| KR101244423B1 (en) * | 2012-07-18 | 2013-03-18 | 서울과학기술대학교 산학협력단 | Nipple for tire having auto control valve of air pressure |
| CN104500806B (en) * | 2014-11-06 | 2017-01-18 | 北京控制工程研究所 | Inflation valve and assembly method thereof |
| CN110370867B (en) * | 2019-08-12 | 2021-02-26 | 江阴博尔汽配工业有限公司 | Clean explosion-proof valve inside |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4678017A (en) * | 1984-06-04 | 1987-07-07 | Eaton Corporation | Wheel end valve for central tire inflation system |
| US4744399A (en) * | 1986-07-31 | 1988-05-17 | Paccar Inc. | Central tire inflation system |
-
1989
- 1989-09-06 CA CA 610491 patent/CA1332042C/en not_active Expired - Lifetime
- 1989-09-07 WO PCT/US1989/003855 patent/WO1990002662A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990002662A1 (en) | 1990-03-22 |
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| MKEX | Expiry |