CA1237627A - Valve actuator - Google Patents
Valve actuatorInfo
- Publication number
- CA1237627A CA1237627A CA000435885A CA435885A CA1237627A CA 1237627 A CA1237627 A CA 1237627A CA 000435885 A CA000435885 A CA 000435885A CA 435885 A CA435885 A CA 435885A CA 1237627 A CA1237627 A CA 1237627A
- Authority
- CA
- Canada
- Prior art keywords
- gas
- valve
- pipe line
- solenoid valves
- pressure
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 230000009467 reduction Effects 0.000 claims description 14
- 230000007423 decrease Effects 0.000 claims description 2
- 208000036366 Sensation of pressure Diseases 0.000 claims 3
- 230000008859 change Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 241000282320 Panthera leo Species 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
- F15B11/072—Combined pneumatic-hydraulic systems
- F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/305—Accumulator separating means without separating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Driven Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Pipeline Systems (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A valve actuator for a valve used on a gas pipe line. The valve actuator comprises solenoid valves which are connected through conduits to the gas pipe line. In operation, the solenoids are energized or de-energized to send the gas flowing through the pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic fluid contained in the pressure vessels.
A valve actuator for a valve used on a gas pipe line. The valve actuator comprises solenoid valves which are connected through conduits to the gas pipe line. In operation, the solenoids are energized or de-energized to send the gas flowing through the pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic fluid contained in the pressure vessels.
Description
~3~7~f~'7 The present invention relates to a valve actuator for a valve used in a gas pipe line and more particularly to a valve actuator provided Wyeth line break device cap-able of automatically closing a valve when the gas pressure in the pipe line drops below a predetermined value, and more specifically, to a valve actuator provided with a line break system capable of automatically closing a valve when the gas pressure of the pipe line drops at a reduction rate greater than a predetermined reduction rate for a period ox time exceeding a predetermined period of time.
BRIEF DESCRIPTION OF THE DRAWINGS
` FIGURE 1 is a representation showing the con-stitution of an exemplary gas-hydraulic valve actuator equipped with a conventional line break system; and FIGURE 2 is a representation showing -the con-stitution of the essential portion of a gas-hydraulic valve actuator equipped with a line break system embodying the present invention.
FIG. 1 is a representation of the constitution of a conventional gas-hydraulic actuator employed in control-lying a ball valve provided with a line break system and used in a gas pipe line, shown by way of example.
In this gas-hydraulic actuator, the valve stem 3 of a ball valve assembly 2 incorporated into a gas pipe line 1 is turned through an angle of 90 at a fixed revolving rate by the arm 31 of the Scotch yoke mechanism of -the 1 actuator assembly to open and close the valve. More specify icily, the gas pressure of the pipe line us transmitted to a pressure vessel 23 or 24 in response to a valve control signal to pressurize the working fluid contained in the pressure vessel and to send the pressurized working fluid into the cylinder of the actuator for shifting a piston 32 and a piston rod 33, whereby the arm is turned in proportion to the stroke of the piston rod. The position of the arm in FIG. l corresponds to the open position of the ball valve.
In order to transmit the gas pressure ox the pipe line to the pressure vessel, an upstream position and a downstream position, with respect to the valve assembly
BRIEF DESCRIPTION OF THE DRAWINGS
` FIGURE 1 is a representation showing the con-stitution of an exemplary gas-hydraulic valve actuator equipped with a conventional line break system; and FIGURE 2 is a representation showing -the con-stitution of the essential portion of a gas-hydraulic valve actuator equipped with a line break system embodying the present invention.
FIG. 1 is a representation of the constitution of a conventional gas-hydraulic actuator employed in control-lying a ball valve provided with a line break system and used in a gas pipe line, shown by way of example.
In this gas-hydraulic actuator, the valve stem 3 of a ball valve assembly 2 incorporated into a gas pipe line 1 is turned through an angle of 90 at a fixed revolving rate by the arm 31 of the Scotch yoke mechanism of -the 1 actuator assembly to open and close the valve. More specify icily, the gas pressure of the pipe line us transmitted to a pressure vessel 23 or 24 in response to a valve control signal to pressurize the working fluid contained in the pressure vessel and to send the pressurized working fluid into the cylinder of the actuator for shifting a piston 32 and a piston rod 33, whereby the arm is turned in proportion to the stroke of the piston rod. The position of the arm in FIG. l corresponds to the open position of the ball valve.
In order to transmit the gas pressure ox the pipe line to the pressure vessel, an upstream position and a downstream position, with respect to the valve assembly
2, of the pipe line are connected through stop valves 4 and 5 to a shuttle valve 13 by means of gas conduits 11 and 12 respectively and the shuttle valve 13 is connected to a pair of 2-position solenoid valves 21 and 22 contained in a housing 20 by a gas conduit 14. The solenoid valves are shown in a neutral position in FIG. 1 where the port of the gas conduit 14 is locked.
When a valve closing signal is applied to a term-final 7, the solenoid 22s of the solenoid valve 22 is en-ergized to shift the spool so that the gas conduit 14 is connected through a shuttle valve 44 to a gas pressure-controlled changeover valve 42 and also to a gas conduit 16 through its branch conduit aye. Consequently, the gas pressure of the pipe line is transmitted through the gas ~L23~7~2~
1 conduits 14, aye and 16 to the pressure vessel I to pros-Sirius the working fluid contained in the pressure vessel 24. The pressurized working fluid flows through a flow control valve 26 and a changeover valve 27 into the cylinder chamber 35 of the actuator assembly to shift the piston and the piston rod ruptured, thus causing the arm of -the Scotch yoke mechanism to turn the valve stem so that the ball valve is closed.
In the other solenoid valve 21, when the solenoid 21s is energized, the gas pressure is transmitted through a changeover valve 40 to a gas pressure-operated change-over valve 41. Then similarly to the case of the sole-nod valve 22, the gas conduit 14 is connected through gas conduits 43b and 15 to the pressure vessel 23. Consequently, the working fluid contained in the pressure vessel 23 is pressurized and the pressurized working fluid is sent through a flow control valve 25 and the changeover valve 27 to the cylinder chamber 34 of the actuator assembly to shift the piston rod left ward thus opening the valve.
- The constitution and the manner ox operation of the conventional line break device will be described here-inciter. A gas conduit 17 is connected through a stop valve 6 to the pipe line. A gas conduit 18 branched Roy the gas conduit 17 is connected through a restricting check valve 50 to a sensing tank 51 to maintain the internal gas pressure ox the sensing tank equal to the internal yes pressure of the pipe line. The gas conduit 17 is connected .
~3'7~
1 both to the diaphragm chamber 54 of a diaphragm changeover valve 53 equipped with a diaphragm 52 and to a port aye connected to a gas conduit 56. Normally, the port aye is blocked. Normally, the pressure in the diaphragm chamber and the pressure at toe port aye are maintained equal to the gas pressure in the pipe line. The secondary side of the changeover valve 53 is connected -through a gas conduit 19 to the sensing tank.
In case the gas pressure in the pipe line is reduced, the internal pressure of the diaphragm chamber of the changeover valve 53 is reduced due to the direct con-section of the diaphragm chamber to the pipe line f whereas since the secondary side of the changeover valve is connected to the sensing tank and the restricting check valve 50 is interposed between the secondary side of the changeover valve 53 an the pipe line, the reduction in the internal pressure of the secondary side is small, and hence a differ-entail pressure is produced between the diaphragm chamber and the secondary side of the changeover valve 53. The differential pressure causes the valve position of the changeover valve 53 to change to the left valve position.
Consequently, the gas supplied from the gas conduit 17 to the changeover valve 53 is supplied through the port aye, the yes conduit 56 and the shuttle valve 44 to the change-over valve 42. At the same time, the same gas pressure is applied to the changeover switch 40 to change the valve position thereof. Accordingly, the changeover valve 42 I
l connects the gas conduits lo and aye to the conduit 16, thus transmitting the gas pressure to the pressure vessel I so that the working fluid contained in the pressure vessel I is pressurized to close the valve.
However, since the reduction in the gas pressure ill the pipe line is detected mechanically by means of the diaphragm changeover valve 53 in the above-mentioned line break system, the accuracy of detection is unsatisfactory, and such a mechanical line break device is inappropriate to a gas pipe line for a corrosive gas. Furthermore, in some cases, it is desirable to close the valve only after the predetermined duration ox gas pressure reduction in a pipe line, and yet the above-mentioned line break system employing a diaphragm changeover valve closes the valve immediately after the gas pressure of the pipe line has been reduced below a predetermined value.
- Accordingly, the present invention has been made to solve those problems in the conventional line break system. It is an object of the present invention to provide an actuator for a valve equipped with a line break system capable to operating accurately when the gas pressure in a pipe line reduces below a predetermined value, and more particularly, to provide a valve actuator for a valve equipped with a line break system capable of operating only after a predetermined duration of the reduction in the gas pressure of a pipe line.
,.
I
1 A valve actuator embodying -the prevent invention comprises gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, the respective solenoids of the solenoid valves are energized or ale energized to send -the gas flowing through the gas pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, in order to drive the valve stem of a valve incorporated into the gas pipe line so that the valve is opened or closed, and a gas pressure detecting device is provided to energize or de-energize the solenoids of the solenoid valves in order to close the valve when the gas pressure detected by the gas pressure detecting device is below a predetermined gas pressure.
; the present invention will be described herein-after in connection with the drawing illustrating a pro-furred embodiment thereof FIG. 2 shows a gas-hydraulic type valve actuator embodying the present invention as applied to a ball valve.
In FIG. 2 part of the same constitution as -that shown in FIG. 1 is omitted for simplicity and an additional con-stitution according to the present invention is shown.
Accordingly, like elements or like constitutions are de-signaled by like reference characters through FIGS. 1 and 2 and the functions of the elements or constitutions ~3~2~
1 designated by the same reference characters are the same.
According to the present invention, a pressure detecting device 60, for example, a pressure gauge, is connected through a gas conduit 17 for the line break system of a gas pipe line to a gas pipe line to detect the gas pressure. The detected gas pressure is applied to a controller 61. when -the detected gas pressure is below a predetermined gas pressure, a control circuit 62 energizes the solenoid 22s of a solenoid valve 22 to connect a gas conduit connected to the gas pipe line to a gas conduit 16.
Consequently, as described herein before, the working fluid contained in a pressure vessel is supplied through a flow control valve 26 and a changeover valve to the cylinder chamber 35 of an actuator/ thus closing the-valve.
In a preferable embodiment of the present invention, the controller does not provide a command signal to energize the solenoid of the solenoid valve unless the detected gas pressure keeps decreasing at a rate greater than a prude-termined rate of gas pressure reduction.
Another valve actuator embodying the present invention comprises a gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, the respective solenoids of the solenoid valves are energized or de-energized to send the gas flowing through the gas pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic 23~
1 fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, ion order to drive -the valve stem of a valve incorporated into the gas pipe line so -that the valve it opened or closed, a gas pressure detecting device is provided to detect the gas pressure in the gas pipe line, and the respective solenoids of the solenoid valves are adapted to be energized so that the valve is closed when the detected gas pressure decreases for a predetermined period of time at a rate greater than a predetermined rate of reduction.
In the second embodiment ox the present invention, -the valve is not closed immediately, but only upon the reduce lion in the gas pressure; the reduction of the gas pressure per unit time period, namely, gas pressure reduction rate, is determined on the basis of the detected gas pressure and the solenoid valve 22 is not actuated unless the measured gas pressure reduction rate is greater than a predetermined reduction rate and, in addition, the duration of gas pros-sure reduction is longer than a predetermined time period.
Ordinary valve control operation, in which the line break system is not used, by the valve actuator of the present invention is carried out by applying a signal to the terminal to energize the solenoid of the solenoid valve 21 or 22. For example, when the solenoid of the solenoid valve 22 is energized by the agency of a circuit, not shown in FIG. 2, the valve can be closed in the same manner as ~;~3~7~7 1 described hereinbe~ore. Furthermore, when the solenoid of the solenoid valve 21 is energized, the conduit 14 connected to the gas pipe line is connected to the conduit 15 to open the valve.
although the present invention has been described hereinhefore as applied to a valve actuator for a gas-hydraulic ball valve, it is obvious that the present invention is applicable not only to a ball valve, but also to a gate valve, since a gate valve differs from a ball valve only in respect of controlling the valve by raising or lowering the valve stem connected to the valve element instead of turning the valve stem as in a ball valve. Furthermore, it is obvious that the present invention is applicable not only to a gas-hydraulic valve actuator, but also to a gas-operated valve actuator in which the gas flowing through the corresponding pipe line is employed as a working fluid for operating the valve actuator.
;: ..
When a valve closing signal is applied to a term-final 7, the solenoid 22s of the solenoid valve 22 is en-ergized to shift the spool so that the gas conduit 14 is connected through a shuttle valve 44 to a gas pressure-controlled changeover valve 42 and also to a gas conduit 16 through its branch conduit aye. Consequently, the gas pressure of the pipe line is transmitted through the gas ~L23~7~2~
1 conduits 14, aye and 16 to the pressure vessel I to pros-Sirius the working fluid contained in the pressure vessel 24. The pressurized working fluid flows through a flow control valve 26 and a changeover valve 27 into the cylinder chamber 35 of the actuator assembly to shift the piston and the piston rod ruptured, thus causing the arm of -the Scotch yoke mechanism to turn the valve stem so that the ball valve is closed.
In the other solenoid valve 21, when the solenoid 21s is energized, the gas pressure is transmitted through a changeover valve 40 to a gas pressure-operated change-over valve 41. Then similarly to the case of the sole-nod valve 22, the gas conduit 14 is connected through gas conduits 43b and 15 to the pressure vessel 23. Consequently, the working fluid contained in the pressure vessel 23 is pressurized and the pressurized working fluid is sent through a flow control valve 25 and the changeover valve 27 to the cylinder chamber 34 of the actuator assembly to shift the piston rod left ward thus opening the valve.
- The constitution and the manner ox operation of the conventional line break device will be described here-inciter. A gas conduit 17 is connected through a stop valve 6 to the pipe line. A gas conduit 18 branched Roy the gas conduit 17 is connected through a restricting check valve 50 to a sensing tank 51 to maintain the internal gas pressure ox the sensing tank equal to the internal yes pressure of the pipe line. The gas conduit 17 is connected .
~3'7~
1 both to the diaphragm chamber 54 of a diaphragm changeover valve 53 equipped with a diaphragm 52 and to a port aye connected to a gas conduit 56. Normally, the port aye is blocked. Normally, the pressure in the diaphragm chamber and the pressure at toe port aye are maintained equal to the gas pressure in the pipe line. The secondary side of the changeover valve 53 is connected -through a gas conduit 19 to the sensing tank.
In case the gas pressure in the pipe line is reduced, the internal pressure of the diaphragm chamber of the changeover valve 53 is reduced due to the direct con-section of the diaphragm chamber to the pipe line f whereas since the secondary side of the changeover valve is connected to the sensing tank and the restricting check valve 50 is interposed between the secondary side of the changeover valve 53 an the pipe line, the reduction in the internal pressure of the secondary side is small, and hence a differ-entail pressure is produced between the diaphragm chamber and the secondary side of the changeover valve 53. The differential pressure causes the valve position of the changeover valve 53 to change to the left valve position.
Consequently, the gas supplied from the gas conduit 17 to the changeover valve 53 is supplied through the port aye, the yes conduit 56 and the shuttle valve 44 to the change-over valve 42. At the same time, the same gas pressure is applied to the changeover switch 40 to change the valve position thereof. Accordingly, the changeover valve 42 I
l connects the gas conduits lo and aye to the conduit 16, thus transmitting the gas pressure to the pressure vessel I so that the working fluid contained in the pressure vessel I is pressurized to close the valve.
However, since the reduction in the gas pressure ill the pipe line is detected mechanically by means of the diaphragm changeover valve 53 in the above-mentioned line break system, the accuracy of detection is unsatisfactory, and such a mechanical line break device is inappropriate to a gas pipe line for a corrosive gas. Furthermore, in some cases, it is desirable to close the valve only after the predetermined duration ox gas pressure reduction in a pipe line, and yet the above-mentioned line break system employing a diaphragm changeover valve closes the valve immediately after the gas pressure of the pipe line has been reduced below a predetermined value.
- Accordingly, the present invention has been made to solve those problems in the conventional line break system. It is an object of the present invention to provide an actuator for a valve equipped with a line break system capable to operating accurately when the gas pressure in a pipe line reduces below a predetermined value, and more particularly, to provide a valve actuator for a valve equipped with a line break system capable of operating only after a predetermined duration of the reduction in the gas pressure of a pipe line.
,.
I
1 A valve actuator embodying -the prevent invention comprises gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, the respective solenoids of the solenoid valves are energized or ale energized to send -the gas flowing through the gas pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, in order to drive the valve stem of a valve incorporated into the gas pipe line so that the valve is opened or closed, and a gas pressure detecting device is provided to energize or de-energize the solenoids of the solenoid valves in order to close the valve when the gas pressure detected by the gas pressure detecting device is below a predetermined gas pressure.
; the present invention will be described herein-after in connection with the drawing illustrating a pro-furred embodiment thereof FIG. 2 shows a gas-hydraulic type valve actuator embodying the present invention as applied to a ball valve.
In FIG. 2 part of the same constitution as -that shown in FIG. 1 is omitted for simplicity and an additional con-stitution according to the present invention is shown.
Accordingly, like elements or like constitutions are de-signaled by like reference characters through FIGS. 1 and 2 and the functions of the elements or constitutions ~3~2~
1 designated by the same reference characters are the same.
According to the present invention, a pressure detecting device 60, for example, a pressure gauge, is connected through a gas conduit 17 for the line break system of a gas pipe line to a gas pipe line to detect the gas pressure. The detected gas pressure is applied to a controller 61. when -the detected gas pressure is below a predetermined gas pressure, a control circuit 62 energizes the solenoid 22s of a solenoid valve 22 to connect a gas conduit connected to the gas pipe line to a gas conduit 16.
Consequently, as described herein before, the working fluid contained in a pressure vessel is supplied through a flow control valve 26 and a changeover valve to the cylinder chamber 35 of an actuator/ thus closing the-valve.
In a preferable embodiment of the present invention, the controller does not provide a command signal to energize the solenoid of the solenoid valve unless the detected gas pressure keeps decreasing at a rate greater than a prude-termined rate of gas pressure reduction.
Another valve actuator embodying the present invention comprises a gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, the respective solenoids of the solenoid valves are energized or de-energized to send the gas flowing through the gas pipe line directly to the corresponding cylinder chambers of the valve actuator through the solenoid valves or to send the gas to pressure vessels to pressurize the hydraulic 23~
1 fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, ion order to drive -the valve stem of a valve incorporated into the gas pipe line so -that the valve it opened or closed, a gas pressure detecting device is provided to detect the gas pressure in the gas pipe line, and the respective solenoids of the solenoid valves are adapted to be energized so that the valve is closed when the detected gas pressure decreases for a predetermined period of time at a rate greater than a predetermined rate of reduction.
In the second embodiment ox the present invention, -the valve is not closed immediately, but only upon the reduce lion in the gas pressure; the reduction of the gas pressure per unit time period, namely, gas pressure reduction rate, is determined on the basis of the detected gas pressure and the solenoid valve 22 is not actuated unless the measured gas pressure reduction rate is greater than a predetermined reduction rate and, in addition, the duration of gas pros-sure reduction is longer than a predetermined time period.
Ordinary valve control operation, in which the line break system is not used, by the valve actuator of the present invention is carried out by applying a signal to the terminal to energize the solenoid of the solenoid valve 21 or 22. For example, when the solenoid of the solenoid valve 22 is energized by the agency of a circuit, not shown in FIG. 2, the valve can be closed in the same manner as ~;~3~7~7 1 described hereinbe~ore. Furthermore, when the solenoid of the solenoid valve 21 is energized, the conduit 14 connected to the gas pipe line is connected to the conduit 15 to open the valve.
although the present invention has been described hereinhefore as applied to a valve actuator for a gas-hydraulic ball valve, it is obvious that the present invention is applicable not only to a ball valve, but also to a gate valve, since a gate valve differs from a ball valve only in respect of controlling the valve by raising or lowering the valve stem connected to the valve element instead of turning the valve stem as in a ball valve. Furthermore, it is obvious that the present invention is applicable not only to a gas-hydraulic valve actuator, but also to a gas-operated valve actuator in which the gas flowing through the corresponding pipe line is employed as a working fluid for operating the valve actuator.
;: ..
Claims (2)
1. valve actuator comprising a gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, respective solenoids of the solenoid valves are energized or de-energized to send gas flowing through the gas pipe line directly to corresponding cylinder chambers of a valve actuator through the solenoid valves or to send the gas to pres-sure vessels to pressurize hydraulic fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, in order to drive a valve stem of a valve incorporated into the gas pipe line so that the valve is opened or closed, and a gas pressure detecting device is provided to energize or de-energize the solenoids of the sole-noid valves in order to close the valve when gas pres-sure detected by the gas pressure detecting device is below a predetermined gas pressure.
2. A valve actuator comprising a gas-hydraulic system, wherein solenoid valves are connected through conduits to a gas pipe line, respective solenoids of the solenoid valves are energized or de-energized to send gas flowing through the gas pipe line directly to corresponding cylinder chambers of a valve actuator through the solenoid valves or to send the gas to pres-sure vessels to pressurize hydraulic fluid contained in the pressure vessels thus causing the pressurized fluid to be supplied to the corresponding cylinder chambers, in order to drive valve stem of a valve incorporated into the gas pipe line so that the valve is opened or closed a gas pressure detecting device is provided to detect gas pressure in the gas pipe line, and the re-spective solenoids of the solenoid valves are adapted to be energized so that the valve is closed when the detected gas pressure decreases for a predetermined period of time at a rate greater than a predetermined rate of reduction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57154860A JPS5943280A (en) | 1982-09-06 | 1982-09-06 | Valve actuator |
| JP57-154860 | 1982-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1237627A true CA1237627A (en) | 1988-06-07 |
Family
ID=15593489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435885A Expired CA1237627A (en) | 1982-09-06 | 1983-09-01 | Valve actuator |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5943280A (en) |
| CA (1) | CA1237627A (en) |
| DE (1) | DE3331746A1 (en) |
| IT (1) | IT1166945B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014066627A1 (en) * | 2012-10-24 | 2014-05-01 | California Institute Of Technology | Hydraulic high pressure valve controller using the in-situ pressure difference |
| US20160273561A1 (en) * | 2015-03-19 | 2016-09-22 | Emerson Process Management, Valve Automation, Inc. | Control fluid power apparatus and related methods |
| CN110500435A (en) * | 2019-07-26 | 2019-11-26 | 江苏理工学院 | A kind of gas-liquid linked control system for the control of oil-gas pipeline valve |
| WO2024036216A1 (en) * | 2022-08-09 | 2024-02-15 | Emerson Process Management Valve Automation Inc. | Energy storage and control system for pipeline flow control |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3633851A1 (en) * | 1986-10-04 | 1988-04-28 | Bopp & Reuther Gmbh | METHOD AND DEVICE FOR CONTROLLING SAFETY VALVES |
| JPS63113597U (en) * | 1987-01-14 | 1988-07-21 | ||
| CN1014354B (en) * | 1987-11-10 | 1991-10-16 | 三菱重工业株式会社 | Testing means for operation pressure of safety valve |
| DE4239240A1 (en) * | 1992-11-21 | 1994-05-26 | Mueller Weingarten Maschf | Method for controlling and / or monitoring a hydraulic accumulator |
| DE59404932D1 (en) * | 1993-08-20 | 1998-02-12 | Von Roll Holding Ag | Pneumatic or hydraulic drive of an underground valve |
| DE102012216156B4 (en) | 2012-09-12 | 2023-11-16 | Franz Xaver Meiller Fahrzeug- Und Maschinenfabrik - Gmbh & Co Kg | Locking device for load transport vehicles |
| US9958880B2 (en) * | 2015-09-16 | 2018-05-01 | Fisher Controls International Llc | Wireless valve actuator system and method |
| CN106122567B (en) * | 2016-08-25 | 2018-10-19 | 成都迈可森流体控制设备有限公司 | A kind of valve actuator based on gas-liquid cluster spring |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS553610Y2 (en) * | 1974-09-03 | 1980-01-28 | ||
| DE3042951C2 (en) * | 1980-11-14 | 1986-04-10 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Method for controlling a valve on pressurized systems |
| EP0057581A3 (en) * | 1981-02-02 | 1982-09-01 | Grove Valve And Regulator Company | Method of and system for controlling pressure responsive regulator valve |
-
1982
- 1982-09-06 JP JP57154860A patent/JPS5943280A/en active Granted
-
1983
- 1983-09-01 CA CA000435885A patent/CA1237627A/en not_active Expired
- 1983-09-02 DE DE19833331746 patent/DE3331746A1/en not_active Ceased
- 1983-09-05 IT IT22769/83A patent/IT1166945B/en active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014066627A1 (en) * | 2012-10-24 | 2014-05-01 | California Institute Of Technology | Hydraulic high pressure valve controller using the in-situ pressure difference |
| US20160273561A1 (en) * | 2015-03-19 | 2016-09-22 | Emerson Process Management, Valve Automation, Inc. | Control fluid power apparatus and related methods |
| WO2016149249A1 (en) * | 2015-03-19 | 2016-09-22 | Emerson Process Management Valve Automation, Inc. | Fluid power actuator for a process valve |
| US9810248B2 (en) | 2015-03-19 | 2017-11-07 | Emerson Process Management, Valve Automation, Inc. | Control fluid power apparatus and related methods |
| CN107429856A (en) * | 2015-03-19 | 2017-12-01 | 爱默生过程管理阀门自动化公司 | Fluid-dynamic actuators for process valve |
| CN107429856B (en) * | 2015-03-19 | 2020-03-10 | 爱默生过程管理阀门自动化公司 | Fluid power actuator for process valve |
| CN110500435A (en) * | 2019-07-26 | 2019-11-26 | 江苏理工学院 | A kind of gas-liquid linked control system for the control of oil-gas pipeline valve |
| WO2024036216A1 (en) * | 2022-08-09 | 2024-02-15 | Emerson Process Management Valve Automation Inc. | Energy storage and control system for pipeline flow control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5943280A (en) | 1984-03-10 |
| IT8322769A0 (en) | 1983-09-05 |
| DE3331746A1 (en) | 1984-03-22 |
| JPH0372872B2 (en) | 1991-11-20 |
| IT1166945B (en) | 1987-05-06 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |