WO2007057927A1 - Pneumatic actuator with stroke regulator - Google Patents
Pneumatic actuator with stroke regulator Download PDFInfo
- Publication number
- WO2007057927A1 WO2007057927A1 PCT/IT2005/000665 IT2005000665W WO2007057927A1 WO 2007057927 A1 WO2007057927 A1 WO 2007057927A1 IT 2005000665 W IT2005000665 W IT 2005000665W WO 2007057927 A1 WO2007057927 A1 WO 2007057927A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pistons
- adjustment
- piston
- flange
- screw
- Prior art date
Links
Classifications
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type
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- 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
- F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
- F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
- F16K31/1635—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston for rotating valves
Definitions
- This invention concerns pneumatic actuators for controlling ball and butterfly valves and the like having a shutter turning at an angle betwe . en the closed and maximum open positions.
- the invention is directed to an innovative system to adjust the stroke of such pneumatic actuators to stop a valve shutter both in the closed position and in different open positions.
- the pneumatic actuators taken into consideration here are usually made up of a body closed by end flanges, two pistons moving in said body and moving in opposite directions, and an exit shaft that turns, controlled by the pistons and which connects up to a valve shutter to be opened and closed according to remote control signals.
- the pistons and turning shaft are kinematically coupled, usually by means of a pinion integral with the shaft which meshes with the rack toothing on each piston.
- a pinion integral with the shaft which meshes with the rack toothing on each piston.
- valve shutter as is the case of ball, butterfly valves and the like, requires a 90° rotation or less between the open and closed positions and vice versa, the piston strokes and rotation perimeters of the exit shaft must be able to be conveniently adjusted for a correct functioning of the valve.
- One of these systems uses at least a stopping device that turns with the shaft of the actuator and which is destined to interact with two stop and regulation screws alternatively to set the opening and closing strokes of the valve.
- the stop devices can be cams, pins or shoulders protruding radially from the shaft, whereas the stop screws are screwed into one side of the actuator body.
- Another known stop system is made up of an adjusting screw which is constrained and moves with a piston and which reacts, when moving in one direction, against the pinion of the exit shaft and, in the opposite direction, against an end flange of the actuator body.
- the stresses and stop forces when opening the valve shutter are transferred to the exit shaft and, consequently onto the kinematic coupling toothing of the shaft with the control pistons having a negative effect on the precision and lifespan of the device.
- a further stop system has two locator and adjustment screws assembled, therefore fixed, on at least one end flange of the actuator body and with one positioned on line and integrating with a first piston and the other in line and integrating with a second piston, passing through the first piston.
- a double adjustment of the strokes respectively in opening and closing is possible.
- the stop involves one piston a time, one in opening and the other in stopping, with the stop forces which are transferred onto the end flange without any spread of the stressing acting on the two pistons.
- This invention on the other hand is aimed at eliminating the abovementioned problems and disadvantages of the well known technology and to ensure better efficiency and increased lifespan of the actuators in question.
- the invention in fact, provide an improved arrangement of means for the adjustment of the piston strokes depending on the controlled rotation angle of the valve shutter and at the same time establishes the conditions so that the stop forces of the pistons at the end of the stroke are downloaded in one direction onto the end flanges of the actuator body and in the opposite direction on the two pistons that are in contrast with each other, uniformly without having any influence on the exit shaft.
- Fig. 1 shows a longitudinal cross section of the actuator in a first position (corresponding to the closing of the controlled valve) and adjustable in the absence of pressure;
- Fig. 2 shows a similar cross section of the actuator in a second position (corresponding to a complete opening of the controlled valve);
- Fig. 3 shows yet another similar cross section of the actuator in a partially open position of the controlled valve
- Fig. 4 shows once again a longitudinal cross section of an actuator set up to be adjusted even in the presence of internal pressure.
- a pneumatic actuator comprises, as is well known: a body 10 closed by end flanges 11 , 12 and forming with them a chamber 13; two pistons 14, 15 housed and movable in said chamber; and an exit shaft 16 placed at right angles between the two pistons, sustained in said body by a turning support and connected to the shutter of a valve - not shown- to be operated Pistons 14, 15 are movable in parallel, in opposite directions to each other, to move away and to near each other, by means of a fluid under pressure fed expressly to the chamber 13 formed by the body 10.
- Each of them has a toothed rack 14', 15', respectively, which mesh with a piston 16' integral with the exit shaft 16 so that the rotations of the shaft correspond to the movements of the pistons.
- the exit shaft 16 turns in the direction to control the closing of the valve shutter is coupled to.
- the exit shaft 16 turns in the direction to open the valve shutter.
- first adjustment screw 17 On an end flange 11 is assembled a first adjustment screw 17 in a position to intercept a first piston 14 when the latter moves towards the flange itself.
- second adjustment screw 18 On the other end flange 12 id assembled a second adjustment screw 18 in a position to intercept the second piston 15 when it moves towards this other flange.
- a third adjustment screw 19 is screwed to the first piston 14 which is facing parallel to the pistons movement axis and that has a head 19' in a position to intercept the second piston 15 and an opposite end 19" facing towards the first flange 11 of the body 10 which can be accessed for adjustment through a hole 20 in said flange and sealed by a cap with a seal 21.
- a fourth adjustment screw 22 is screwed to the second piston 15, parallel to the third screw and with a head 22" in a position to intercept the first piston 14 and an opposite end 22" facing towards the second flange 12 of the body 10 and which can be accessed for adjustment through a hole 23 in said flange and sealed by a cap with a seal 24.
- each of the adjustment screws 19 and 22 fixed to pistons 14, 15 is assembled a seal 25 to avoid leakage of fuel along the screws.
- the first and second adjustment screws 17 and 18 fixed to the end flanges of the body 10 it is possible to set the strokes of pistons 14, 15 when they move away from the flanges and which corresponds to the closing of the controlled valve.
- the third and fourth adjustments screw 19 and 22 on board pistons 14, 15 it is possible to vary the these strokes depending on the degree of opening of the controlled valve, the pistons stopping reciprocally as soon as they come into contact with the heads of said screws.
Abstract
This invention relates to a pneumatic actuator for valves, comprising an actuator body (10) and two pistons (14, 15) housed in said body and moving in parallel in opposite directions, to move away and to move towards each other. At least one piston (14) has an adjustment screw (19) screwed into it with a head (19’) in a position to intercept and stop the other piston (15) when the two pistons move towards each other, and an end (19’’) facing towards a respective end flange (11) of the actuator body and accessible for adjustment of the screw through a hole (20) in said flange and sealed by a cap with a seal (21).
Description
"PNEUMATIC ACTUATOR WITH STROKE REGULATOR"
Field of invention
This invention concerns pneumatic actuators for controlling ball and butterfly valves and the like having a shutter turning at an angle betwe.en the closed and maximum open positions. In particular the invention is directed to an innovative system to adjust the stroke of such pneumatic actuators to stop a valve shutter both in the closed position and in different open positions. State of the Technique
The pneumatic actuators taken into consideration here are usually made up of a body closed by end flanges, two pistons moving in said body and moving in opposite directions, and an exit shaft that turns, controlled by the pistons and which connects up to a valve shutter to be opened and closed according to remote control signals.
The pistons and turning shaft are kinematically coupled, usually by means of a pinion integral with the shaft which meshes with the rack toothing on each piston. This means that the stroke in one direction of the pistons corresponds to a turn of the shaft, for example, to open the valve shutter connected to it, whereas the stroke of the pistons in the opposite direction corresponds to the closing of said valve shutter.
When the valve shutter, as is the case of ball, butterfly valves and the like, requires a 90° rotation or less between the open and closed positions and
vice versa, the piston strokes and rotation perimeters of the exit shaft must be able to be conveniently adjusted for a correct functioning of the valve.
For adjustments of this kind various systems have been proposed and adopted as of date. One of these systems uses at least a stopping device that turns with the shaft of the actuator and which is destined to interact with two stop and regulation screws alternatively to set the opening and closing strokes of the valve. The stop devices can be cams, pins or shoulders protruding radially from the shaft, whereas the stop screws are screwed into one side of the actuator body.
Another known stop system is made up of an adjusting screw which is constrained and moves with a piston and which reacts, when moving in one direction, against the pinion of the exit shaft and, in the opposite direction, against an end flange of the actuator body. In both the abovementioned systems however, the stresses and stop forces when opening the valve shutter are transferred to the exit shaft and, consequently onto the kinematic coupling toothing of the shaft with the control pistons having a negative effect on the precision and lifespan of the device.
A further stop system has two locator and adjustment screws assembled, therefore fixed, on at least one end flange of the actuator body and with one positioned on line and integrating with a first piston and the other in line and integrating with a second piston, passing through the first piston. In this conformation, a double adjustment of the strokes respectively in opening and closing is possible. However the stop involves one piston a time, one in
opening and the other in stopping, with the stop forces which are transferred onto the end flange without any spread of the stressing acting on the two pistons.
Object and Summery of the Invention This invention on the other hand is aimed at eliminating the abovementioned problems and disadvantages of the well known technology and to ensure better efficiency and increased lifespan of the actuators in question.
Thus it is one object of the invention to provide and realise a pneumatic actuator for valves incorporating an adjustment system of the opening and closing strokes aimed at protecting the more delicate coupling zones between pistons and exit shaft which are of vital importance to the functioning and lifespan of the actuator.
The invention, in fact, provide an improved arrangement of means for the adjustment of the piston strokes depending on the controlled rotation angle of the valve shutter and at the same time establishes the conditions so that the stop forces of the pistons at the end of the stroke are downloaded in one direction onto the end flanges of the actuator body and in the opposite direction on the two pistons that are in contrast with each other, uniformly without having any influence on the exit shaft.
The object and the conditions considered above are reached with a pneumatic actuator according as a minimum to claim 1. Brief Description of the Drawings
The invention will however be illustrated more in detail in the continuation of this description made in reference to the enclosed indicative and not limiting drawings, in which:
Fig. 1 shows a longitudinal cross section of the actuator in a first position (corresponding to the closing of the controlled valve) and adjustable in the absence of pressure;
Fig. 2 shows a similar cross section of the actuator in a second position (corresponding to a complete opening of the controlled valve);
Fig. 3 shows yet another similar cross section of the actuator in a partially open position of the controlled valve; and
Fig. 4 shows once again a longitudinal cross section of an actuator set up to be adjusted even in the presence of internal pressure. Detailed Description of the Invention
In the illustrated example, a pneumatic actuator comprises, as is well known: a body 10 closed by end flanges 11 , 12 and forming with them a chamber 13; two pistons 14, 15 housed and movable in said chamber; and an exit shaft 16 placed at right angles between the two pistons, sustained in said body by a turning support and connected to the shutter of a valve - not shown- to be operated Pistons 14, 15 are movable in parallel, in opposite directions to each other, to move away and to near each other, by means of a fluid under pressure fed expressly to the chamber 13 formed by the body 10. Each of them has a toothed rack 14', 15', respectively, which mesh with a piston 16' integral with the exit shaft 16 so that the rotations of the shaft correspond to
the movements of the pistons. In particular, when the pistons move towards the end flanges, moving away from each other - Fig.1. the exit shaft 16 turns in the direction to control the closing of the valve shutter is coupled to. Vice versa, when the pistons move towards each other Fig. 2, the exit shaft 16 turns in the direction to open the valve shutter.
On an end flange 11 is assembled a first adjustment screw 17 in a position to intercept a first piston 14 when the latter moves towards the flange itself. In the same way, on the other end flange 12 id assembled a second adjustment screw 18 in a position to intercept the second piston 15 when it moves towards this other flange.
A third adjustment screw 19 is screwed to the first piston 14 which is facing parallel to the pistons movement axis and that has a head 19' in a position to intercept the second piston 15 and an opposite end 19" facing towards the first flange 11 of the body 10 which can be accessed for adjustment through a hole 20 in said flange and sealed by a cap with a seal 21.
In the example shown, a fourth adjustment screw 22 is screwed to the second piston 15, parallel to the third screw and with a head 22" in a position to intercept the first piston 14 and an opposite end 22" facing towards the second flange 12 of the body 10 and which can be accessed for adjustment through a hole 23 in said flange and sealed by a cap with a seal 24.
Around each of the adjustment screws 19 and 22 fixed to pistons 14, 15 is assembled a seal 25 to avoid leakage of fuel along the screws.
Practically, with the first and second adjustment screws 17 and 18 fixed to the end flanges of the body 10 it is possible to set the strokes of pistons 14, 15 when they move away from the flanges and which corresponds to the closing of the controlled valve. With the third and fourth adjustments screw 19 and 22 on board pistons 14, 15 it is possible to vary the these strokes depending on the degree of opening of the controlled valve, the pistons stopping reciprocally as soon as they come into contact with the heads of said screws.
In the realisation method shown in Figs. 1-3, registration of the position of the adjusting screws 19 and 22 on board the pistons using the holes 20, 23 in the end flanges 11 , 12 is possible only in the absence of pressure in the actuator, otherwise on opening caps 21 and 22 the internal fluid -would discharge externally into the atmosphere.
In the variation shown in Fig.4, the ends 19" and 22" of the adjustment screws on board the pistons are permanently guided in the access holes 20, 23 in flanges 11 , 12 each one with interposition of a seal 26 which, by preventing the leakage of the fluid from the body chamber 10, enables registration of said screws consequently the adjustment of the piston strokes, even in the presence of pressure in the actuator. Finally, worthy of note is that the adjustment of the piston strokes when . moving towards each other and which corresponds to the opening of the controlled valve, will be possible even with only one adjustment screw on board only one piston, even if the use of two screws, one on each piston, allows a more uniform and balanced distribution of the stop forces.
Claims
1. Pneumatic actuator for valves, comprising an actuator body (10) closed by end flanges (11 , 12) and forming a chamber (13), two pistons (14, 15) housed in said chamber and moving in parallel in opposite directions, to move away and to move towards each other, by means of a fluid under pressure fed into said chamber, and an exit shaft (16) with turning controlled by said two pistons, sustained in said body by a turning support and connected to the shutter of a valve to be operated, and where on the end flanges of the actuator body are assembled, two adjustment screws one for each flange (17, 18), in a position to intercept and stop the pistons when these move away from or towards each other, characterised in that at least one piston (14) has an adjustment screw (19) screwed into it with a head (19') in a position to intercept and stop the other piston (15) when the two pistons move towards each other, and an end (19") facing towards a respective end flange (11) of the actuator body and accessible for adjustment of the screw through a hole (20) machined in said flange and sealed by a cap with a seal (21).
2. A pneumatic actuator according to claim one, characterised by the fact that a third adjustment screw (19) is screwed into the first piston (14) and has a head (19') in a position to intercept and stop the second piston (15) when the two pistons move towards each other, and an opposite end (19") facing towards a first end flange (11) of the actuator body and accessible for adjustment of said third screw through a hole (20) machined in said first flange and sealed by a cap with a seal (21), and by the fact that a fourth adjustment screw (22) is screwed into the second piston (15), parallel to said third adjustment screw (19) with a head (22'), in a position to intercept and to stop the first piston (14) when the two pistons move towards each other, and an opposite end (22") facing towards a respective end flange (12) of the actuator body and accessible for adjustment of the screw through a hole (23) machined in said flange and sealed by a cap with a seal (24).
3. A pneumatic actuator according to claims 1 or 2, wherein at least one seal is assembled around each adjustment and stop screw (19, 22) on board the pistons
4. A pneumatic actuator according to claims 1 or 2, wherein the end (19", 22") of each adjustment and stop screw (19,22) on board said pistons is guided and sealed with the interposition of a seal, in respective access hole (20,23) provided in each end flange of the actuator body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IT2005/000665 WO2007057927A1 (en) | 2005-11-15 | 2005-11-15 | Pneumatic actuator with stroke regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IT2005/000665 WO2007057927A1 (en) | 2005-11-15 | 2005-11-15 | Pneumatic actuator with stroke regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007057927A1 true WO2007057927A1 (en) | 2007-05-24 |
Family
ID=36616839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2005/000665 WO2007057927A1 (en) | 2005-11-15 | 2005-11-15 | Pneumatic actuator with stroke regulator |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2007057927A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008047396A2 (en) * | 2006-10-20 | 2008-04-24 | Omal S.P.A. | Pneumatic actuator, in particular for valves |
| CN100458250C (en) * | 2007-06-21 | 2009-02-04 | 济南高仕机械制造有限公司 | Fan type pneumatic power executor |
| CN101858458A (en) * | 2010-06-08 | 2010-10-13 | 清华大学 | Pneumatic executor for driving valve |
| CN102128187A (en) * | 2011-04-06 | 2011-07-20 | 肇庆市端州区志德五金有限公司 | Difunctional cylinder |
| ITBS20120078A1 (en) * | 2012-05-04 | 2013-11-05 | Actuatech S R L | PNEUMATIC ACTUATOR PROVIDED WITH ADJUSTABLE LIMIT SWITCH |
| CN104864157A (en) * | 2014-09-09 | 2015-08-26 | 浙江康赛特阀门有限公司 | High-torque pneumatic actuator provided with one cylinder and four pistons |
| CN106439182A (en) * | 2016-12-06 | 2017-02-22 | 无锡优耐特净化装备有限公司 | Pneumatic actuator |
| US11053961B2 (en) * | 2018-12-11 | 2021-07-06 | Schlumberger Technology Corporation | Piston control via adjustable rod |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4100816A (en) * | 1975-11-29 | 1978-07-18 | Clark Malcolm D | Manual control apparatus |
| FR2683883A1 (en) * | 1991-11-14 | 1993-05-21 | Sectoriel | Device ensuring that a member which can move about an axis is kept in a locked position and for manoeuvring this member |
| US6003432A (en) * | 1995-07-17 | 1999-12-21 | Ksb S.A. | Actuator including a jack |
| EP0976931A1 (en) * | 1998-07-29 | 2000-02-02 | G.T. Componenti Srl | Device for adjusting the central position of the pistons and the angular position of the pinion in a valve driving actuator |
-
2005
- 2005-11-15 WO PCT/IT2005/000665 patent/WO2007057927A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4100816A (en) * | 1975-11-29 | 1978-07-18 | Clark Malcolm D | Manual control apparatus |
| FR2683883A1 (en) * | 1991-11-14 | 1993-05-21 | Sectoriel | Device ensuring that a member which can move about an axis is kept in a locked position and for manoeuvring this member |
| US6003432A (en) * | 1995-07-17 | 1999-12-21 | Ksb S.A. | Actuator including a jack |
| EP0976931A1 (en) * | 1998-07-29 | 2000-02-02 | G.T. Componenti Srl | Device for adjusting the central position of the pistons and the angular position of the pinion in a valve driving actuator |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008047396A2 (en) * | 2006-10-20 | 2008-04-24 | Omal S.P.A. | Pneumatic actuator, in particular for valves |
| WO2008047396A3 (en) * | 2006-10-20 | 2008-06-19 | Omal S P A | Pneumatic actuator, in particular for valves |
| US8056466B2 (en) | 2006-10-20 | 2011-11-15 | Omal S.P.A. | Pneumatic actuator, in particular for valves |
| CN100458250C (en) * | 2007-06-21 | 2009-02-04 | 济南高仕机械制造有限公司 | Fan type pneumatic power executor |
| CN101858458A (en) * | 2010-06-08 | 2010-10-13 | 清华大学 | Pneumatic executor for driving valve |
| CN102128187A (en) * | 2011-04-06 | 2011-07-20 | 肇庆市端州区志德五金有限公司 | Difunctional cylinder |
| ITBS20120078A1 (en) * | 2012-05-04 | 2013-11-05 | Actuatech S R L | PNEUMATIC ACTUATOR PROVIDED WITH ADJUSTABLE LIMIT SWITCH |
| WO2013164716A1 (en) * | 2012-05-04 | 2013-11-07 | Actuatech S.P.A. | Pneumatic actuator provided with adjustable end-position |
| CN104864157A (en) * | 2014-09-09 | 2015-08-26 | 浙江康赛特阀门有限公司 | High-torque pneumatic actuator provided with one cylinder and four pistons |
| CN106439182A (en) * | 2016-12-06 | 2017-02-22 | 无锡优耐特净化装备有限公司 | Pneumatic actuator |
| US11053961B2 (en) * | 2018-12-11 | 2021-07-06 | Schlumberger Technology Corporation | Piston control via adjustable rod |
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