CA1220992A - Gas control valve - Google Patents
Gas control valveInfo
- Publication number
- CA1220992A CA1220992A CA000473704A CA473704A CA1220992A CA 1220992 A CA1220992 A CA 1220992A CA 000473704 A CA000473704 A CA 000473704A CA 473704 A CA473704 A CA 473704A CA 1220992 A CA1220992 A CA 1220992A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- valve
- fluid
- pressure
- passage
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0239—Pressure or flow regulators therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Lift Valve (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
There is disclosed a gas pressure control valve that is pressure balanced so that the torque required to operate the valve is independent of the internal pressure of the valve. A control piston within the valve body is subject to pressure, which is balanced by a bore through the piston to a pressure chamber through which the fluid under pressure may move so that gas pressure acting on one end of the piston is balanced by the gas pressure in the pressure chamber at the opposite end of the piston.
There is disclosed a gas pressure control valve that is pressure balanced so that the torque required to operate the valve is independent of the internal pressure of the valve. A control piston within the valve body is subject to pressure, which is balanced by a bore through the piston to a pressure chamber through which the fluid under pressure may move so that gas pressure acting on one end of the piston is balanced by the gas pressure in the pressure chamber at the opposite end of the piston.
Description
Z
6613-~
This invention relates to a fluid valve, espe-cially for gases. It is especially useful Eor gas supply control in internal combustion engines.
There is frequently a need in the fuel supply for internal combustion engines for control of the rate of flow o gases, for example to the cylinders of the engine in a dual fuel engine. Often, the power available to move such valves is very limited. The present inven-tion provides a gas control valve so constructed that the power required to move a valve element is very small.
According to the invention, there is provided a fluid valve comprising a valve body~ a piston slidable in a cylindrical bore in the body, means for moving the piston, and a fluid passage extending from a fluid inlet to a fluid outlet via the piston, movement of the piston controlling the flow of fluid through the passage, one end of the piston being within the passage and subject to pressure of fluid in the passage, a pressure chamber at the end of the piston opposite to the one end, and a passage extending from the one end of the piston to the pressure chamber at the opposite end whereby the pressure acting on the piston at the one end is balanced by the pressure at the opposite end to reduce the force required to move the piston between open and closed positions.
PreEerably, the Eluid passage extends ~rom a side of the body via an annular recess surrounding the piston to an area adjacent the one end of the piston.
The recess may be tapered from its widest portion toward the one end of the piston, and the cylindrical bore may be counterbored and thus widened to define a valve seat surrounding the one end o~ the piston. The valve seat may be adjacent the annular recess, whereby the coacting annular recess and valve seat vary the size of the opening of the valve with movement o~ the piston.
The attached drawing illustrates an embodiment of the invention.
In the drawing, valve body 10 has a cylinder or bore 11 in which there is slidable a piston 12. A pair of gas inlet passages 13, 13' supply gas under pressure to a chamber 26. An annular recess 15 surrounds the piston 12, and is tapered at 16; the taper may comprise a curve as will be described below. The crown 17 of the piston is widened at 18, with the widened portion being slidable in a counterbore 27. The counterbore, with the crown 17 o~ the piston 12, defines a pressure outlet chamber 14.
Extending through the piston 12 is a bore 25.
At the end of the piston opposite to the crown 17 there is a sealed pressure chamber 21.
Within the chamber 26, mounted on shaft 20 and ~L~Zl)9~3Z
secured thereto e.g. by a ~ey 30, there is a lever arm 19 which engages in a recess 28 in the side of the piston 12. Rotation of the shaft 20 moves the lever 19 to the right, as shown in the Figure, to move the piston and vary the flow of gas from chamber 13 past the plston into the outlet chamber 14.
The piston may be recessed at 23, 24 to reduce its weight. 0-rings are provided at 29 and 31 to seal against gas leakage.
In the prior art that is absent the pressure chamber 21, once the valve is opened the pressure of the gas within the chamber 14 would act on the crown 17 of the piston 1~ to resist movement of the piston. To com-pensate for this, bearing in mind the limited torque available at the shaft 20, the bore 25 supplies gas under pressure to the pressure chamber 21 wherein the gas acts on the end 22 of the piston to balance the pressure on the crown 17. Thus the torque necessary to rotate the shaft 20 is substantially reduced when compared with other constructions not having the balancing feature~
The curve in the taper 16 on the piston is designed primarily to provide a relatively "dead band"
for the start of the valve opening r leading smoothly into a progressively greater opening that is designed to match the maximum (full load) flow requirements of an engine.
The "dead band" provides stable governor control action 12;~0992 when Euel Elow requirements are small; i.e. a higher ratio oE governor travel to fuel flow when fuel Elow is low, as it is for light load.
6613-~
This invention relates to a fluid valve, espe-cially for gases. It is especially useful Eor gas supply control in internal combustion engines.
There is frequently a need in the fuel supply for internal combustion engines for control of the rate of flow o gases, for example to the cylinders of the engine in a dual fuel engine. Often, the power available to move such valves is very limited. The present inven-tion provides a gas control valve so constructed that the power required to move a valve element is very small.
According to the invention, there is provided a fluid valve comprising a valve body~ a piston slidable in a cylindrical bore in the body, means for moving the piston, and a fluid passage extending from a fluid inlet to a fluid outlet via the piston, movement of the piston controlling the flow of fluid through the passage, one end of the piston being within the passage and subject to pressure of fluid in the passage, a pressure chamber at the end of the piston opposite to the one end, and a passage extending from the one end of the piston to the pressure chamber at the opposite end whereby the pressure acting on the piston at the one end is balanced by the pressure at the opposite end to reduce the force required to move the piston between open and closed positions.
PreEerably, the Eluid passage extends ~rom a side of the body via an annular recess surrounding the piston to an area adjacent the one end of the piston.
The recess may be tapered from its widest portion toward the one end of the piston, and the cylindrical bore may be counterbored and thus widened to define a valve seat surrounding the one end o~ the piston. The valve seat may be adjacent the annular recess, whereby the coacting annular recess and valve seat vary the size of the opening of the valve with movement o~ the piston.
The attached drawing illustrates an embodiment of the invention.
In the drawing, valve body 10 has a cylinder or bore 11 in which there is slidable a piston 12. A pair of gas inlet passages 13, 13' supply gas under pressure to a chamber 26. An annular recess 15 surrounds the piston 12, and is tapered at 16; the taper may comprise a curve as will be described below. The crown 17 of the piston is widened at 18, with the widened portion being slidable in a counterbore 27. The counterbore, with the crown 17 o~ the piston 12, defines a pressure outlet chamber 14.
Extending through the piston 12 is a bore 25.
At the end of the piston opposite to the crown 17 there is a sealed pressure chamber 21.
Within the chamber 26, mounted on shaft 20 and ~L~Zl)9~3Z
secured thereto e.g. by a ~ey 30, there is a lever arm 19 which engages in a recess 28 in the side of the piston 12. Rotation of the shaft 20 moves the lever 19 to the right, as shown in the Figure, to move the piston and vary the flow of gas from chamber 13 past the plston into the outlet chamber 14.
The piston may be recessed at 23, 24 to reduce its weight. 0-rings are provided at 29 and 31 to seal against gas leakage.
In the prior art that is absent the pressure chamber 21, once the valve is opened the pressure of the gas within the chamber 14 would act on the crown 17 of the piston 1~ to resist movement of the piston. To com-pensate for this, bearing in mind the limited torque available at the shaft 20, the bore 25 supplies gas under pressure to the pressure chamber 21 wherein the gas acts on the end 22 of the piston to balance the pressure on the crown 17. Thus the torque necessary to rotate the shaft 20 is substantially reduced when compared with other constructions not having the balancing feature~
The curve in the taper 16 on the piston is designed primarily to provide a relatively "dead band"
for the start of the valve opening r leading smoothly into a progressively greater opening that is designed to match the maximum (full load) flow requirements of an engine.
The "dead band" provides stable governor control action 12;~0992 when Euel Elow requirements are small; i.e. a higher ratio oE governor travel to fuel flow when fuel Elow is low, as it is for light load.
Claims (6)
1. A fluid valve comprising a valve body, a piston slidable in a cylindrical bore in the body, means for moving the piston, and a fluid passage extending from a fluid inlet to a fluid outlet via the piston, movement of the piston controlling the flow of fluid through the passage, one end of the piston being within the passage and subject to pressure of fluid in the passage, a pressure chamber at the end of the piston opposite to the one end, and a passage extending from the one end of the piston to the pressure chamber at the opposite end whereby the pressure acting on the piston at the one end is balanced by the pressure at the opposite end to reduce the force required to move the piston between open and closed positions.
2. A fluid valve as claimed in claim 1 wherein the fluid passage extends from a side of the body via an annular recess in the piston to an area adjacent the one end of the piston, the recess being tapered from its widest portion toward said one end of the piston, the cylindrical bore being counterbored and thus widened to define a valve seat surrounding the one end of the piston, the valve seat being adjacent the annular recess, whereby the coacting taper and valve seat vary the size of the opening of the valve with movement of the piston.
3. A fluid valve as claimed in claim 2 wherein the one end of the piston is widened to define a crown, wider than the bore, slidable with counterbore.
4. A fluid valve as claimed in claim 1 or 2 or 3 wherein the ends of the piston are recessed to reduce its weight.
5. A fluid valve as claimed in claim 2 wherein the means for moving the piston comprise a lever mounted on a shaft journalled in the valve body, the lever end engaging a recess in the piston to effect move-ment of the piston.
6. A fluid valve as claimed in claim 5 wherein the taper of the recess is curved to vary the rate of the valve opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000473704A CA1220992A (en) | 1985-02-06 | 1985-02-06 | Gas control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000473704A CA1220992A (en) | 1985-02-06 | 1985-02-06 | Gas control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1220992A true CA1220992A (en) | 1987-04-28 |
Family
ID=4129772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000473704A Expired CA1220992A (en) | 1985-02-06 | 1985-02-06 | Gas control valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1220992A (en) |
-
1985
- 1985-02-06 CA CA000473704A patent/CA1220992A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |