MXPA01004106A - Valve - Google Patents

Abstract

A driven piston valve (1), particularly a remotely drivable valve, comprising a cage (10) and a stem (3) associated to the piston (31) and at least a pneumatic driving member (2) associated to the stem (3), the driving member (2) being able to selectively displace the stem (3) axially inside the cage (10), the driving member (2) comprising a flexible membrane (20).

Description

PISTON ACTIVATED VALVE The present invention relates to a piston valve that is activated remotely.

Description of the Prior Art In general, piston valves are operated manually, by means of a rotary flywheel. However, this configuration causes several drawbacks, which are mentioned below. As a first drawback, there is the impossibility of operating the valve remotely, requiring an operator to perform such a task, and which ends up increasing the costs of valve operation. In the case of the existence of several valves, in a line or circuit and / or in the case that they are located far from the place where the operator is, there may be a great delay in the operation of the same, which may be highly undesirable . In addition, the manual and rotary operation of these valves leads to substantial wear mainly of the actuating elements, which decreases their useful life and also causes an undesirable increase in the operation and maintenance costs thereof.

Brief Description of the Invention The present invention discloses an activated piston valve, in particular a remotely activated valve, comprising a body, a frame, a rod associated with the piston and a pneumatic activating element associated with the shaft, the activating element capable of of displacing the piston and the shaft selectively, axially, inside the valve body, the activating element comprising a flexible membrane.

SUMMARY OF THE DRAWINGS The present invention is described in detail below, on the basis of an exemplary embodiment shown in the drawings. The figures show: Figure 1 - is a sectional view of a first embodiment of the valve object of the present invention; and Figure 2 - is a sectional view of a second embodiment of the valve object of the present invention. Figure 3 - is an enlarged perspective view of the valves illustrated in Figures 1 and 2.

Detailed Description of the Drawings As can be seen from Figure 1, the activated piston valve 1 object of the present invention comprises a pneumatic activating element 2, which has an associated impermeable flexible membrane 20, through its first region end, a first mobile element 22, and through a second end region, opposite the first end region, to a first fixed element 23. The fixed element 23 is mounted on the frame 10 of the valve 1, and the movable element 22 is fixed to a first end of a rod 3 by means of a nut 9, the elements 22, 23 and the membrane 20 delimiting an airtight chamber 21, which is filled with compressed air under pressure, which is placed or removed from that chamber 21 through a connection 80, which also makes it possible to maintain the desired pressure inside it. The rod 3 is located inside the frame 10 of the valve, with its longitudinal axis coinciding substantially with the longitudinal axis of the frame 10, and can undergo axial movements in the frame 10. In the second end, the shaft 3 is associated with a piston 31, which moves in solidarity with it.

The valve 1 has a spring 4 of the helical type having a first end that rests on the fixed element 23 and a second end that rests on a stop mounted on the shaft 3, the spring is arranged so that its longitudinal axis it substantially coincides with the longitudinal axis of the frame 10 and the horn 3. The horn 3 also has means for regulating the tension of the spring 4. The pneumatic element 2 is put into operation when the chamber 21 is filled with air compressed under pressure (maximum 8 bar), which causes movement, in the axial direction, of the mobile element 22 and, consequently, of the rod 3 and of the piston 31. In this situation, the waterproof flexible membrane 20 assumes a stretch / elongation posture and the coil spring 4 is compressed. To close the valve 1, the chamber 21 must be emptied and the coil spring 4 distended to the equilibrium position, moving the shaft 3 and the piston 31 in the axial direction, in the downward direction. The ascending movement of the rod 3 and of the piston 31 makes it possible to pass the flow of liquid through a body 5 of the valve 1, opposite the pneumatic activating element 2, when its movement releases the communication between the liquid inlet pipe 50 and the liquid outlet pipe 51. The piston 31 moves axially in a chamber 30, which has a substantially cylindrical format and has an axial passage hole that is located in the inside the body 5 in the junction region 52 between the pipes 50 and 51, and when the upward movement releases the passage of the liquid flow, which enters into that chamber 30, through the lower part thereof, and leaves the chamber 30 through side windows 33. When the piston 31 moves in the downward direction, it penetrates the region of the chamber 30 that has the windows 33 and prevents the passage of the liquid therethrough. To provide a hermetic seal between the piston 31 and the chamber 30, two elastic sealing rings 32 are provided, arranged in opposite axial portions of the chamber 30. The valve 1, depending on the convenience and needs of the utilization project, can be found normally closed and the compressed air pressure of the pneumatic actuator 2 provides its opening, or it may be normally open, which means that the coil spring 4 keeps the valve 1 open and the Pressure of the compressed air of the pneumatic activating element 2 provides its closure. It is evident that these two possibilities are merely configuration variations. Optionally, a double action activated piston valve 100 can be conceived, according to FIG. 2, whose great difference in relation to the valve 1 is the replacement of the helical spring 4 by a second pneumatic actuator 6, located substantially adjacent to the first pneumatic activating element 2 and which, similarly, has an impermeable flexible membrane 60 associated through its first end region to a second fixed element 24 and through its second end region, to a second mobile element 25 The fixed element 24 is mounted on the frame 10 of the valve 100, and the movable element 25 is fixed to a first end of a shaft 3, together with the first mobile element 22, which was described in the aforesaid, forming a solidary group. The elements 25, 24 and the membrane 60 delimit a hermetic chamber 61 that is filled with compressed air under pressure, which is placed or removed from the chamber 61 through a connection 81, which also makes it possible to maintain the desired pressure inside. The rod 3 is located inside the frame 10 of the valve 100, with its longitudinal axis coinciding substantially with the longitudinal axis of the frame 10, and can undergo axial movements in the frame 10. At its second end, the pin 3 is associated with a piston 31, which moves in solidarity with it. When the chamber 61 is filled with compressed air under high pressure, it causes the movement, in the axial direction and upward direction, of the movable elements 22, 25 and consequently, of the horn 3 and of the piston 31, which prevents the passage of liquid through the pipes 50, 51 and through the chamber 30. In this situation, the flexible waterproof membrane 60 assumes a stretching posture and the membrane 20 remains contracted. To realize the opening of the valve 100, the chamber 61 is emptied and the chamber 21 is filled with compressed air, which causes the movement, in the axial direction and upward direction, of the mobile elements 22, 25, antler 3 and piston 31, which enables the passage of the liquid flow through the body 5 of the valve 1, as mentioned above. In the valve 100, the pneumatic activating element 6 fulfills the function of helical spring 4, presenting work in the opposite direction to that presented by the pneumatic activating element 2, which allows a more exact control of the opening and closing of the valve 100. In Optional form, the pneumatic system of the opening and closing of valves 1, 100 may be operated with other gases under pressure, other than atmospheric air, such as nitrogen gas, for example, without the invention suffering alterations that substantially differentiate it from the two embodiments mentioned above. The piston and the chamber 30 project to allow perfect sealing, due to the two elastic sealing rings 32. When the piston 31 performs the axial downward movement inside the chamber 30, to close the passage of liquid through the the pipes 50, 51 and the piston 31 also move axially inside the rings 32, which have a radial load that is obtained from the axial load that comes from the fixing of the screws 7, which fix the frame 10 to the body of the valve 1, 100. The radial load of the rings 32 acts against all lateral surface of the piston 31, and provides a perfect seal to the 1,100 valve.

When the passage of the liquid to the lateral surface of the piston 31 does not occur, only the front part of the piston 31 remains exposed to the severity of the medium. Therefore, erosion of the lateral surface of the piston 31 and consequent impermeability failures of the 1,100 valve does not occur. The assembly formed by the piston 31 and the chamber 30 can be changed easily, without the need to remove the valve 1, 100 from the line in which it is installed, by unscrewing the screws 7 and removing the frame 10, the body remaining 5 installed in the pipeline. In addition to enabling quick and easy repair in case of failure, you can change the set if you want to work with different fluid flow coefficients. The wide variation possibility of the assemblies, whose differences are located in the format of the front part of the piston 31 and the number and format of the holes 33 of the chamber 30, allows a wide possibility of use of the valve 1, 100 , with significantly different flows, which allows its use even in applications where they need extremely fine adjustments of flow, without the need for replacement of the valve body 5. This fact brings with it a huge advantage in the market and flexibility of use. According to the above, when the valve 1,100 is closed, the piston 1,3 enters the lower ring 32 and removes any foreign matter from the inner surface of the ring 32. Such particles do not accumulate in the sealing region of the ring. valve 1,100, which does not run the risk of becoming damaged. Preferably, the piston 31 is made of AISI 304 stainless steel, to possess a great immunity to chemical attack and wear by abrasion, while the rings 32 are made of graphite and stainless steel AISI 316, which are virtually inert products to the attacks chemicals and have a coefficient of friction approximated to that presented by ice on ice. In addition, rings 32 can work over a significantly wide temperature range, between -195 ° C and + 550 ° C. As other advantages, the invention enables the activation of the 1,100 valve remotely, with rapidity and great accuracy in the control of liquid flow, with a service life of 2 million opening and closing cycles at an ambient temperature of 70 ° C. .

In addition, since there is no type of rotary movement in the components of the 1,100 valve, the life of these components is considerably higher when compared to conventional valves, in addition to being able to be installed in any position, which provides an extraordinary flexibility of installation and use. Having thus described a preferred embodiment, it should be understood that the scope of the present invention encompasses other possible variations, limited only by the wording of the appended claims, including in the same the possible equivalents.

Claims (25)

NOVELTY OF THE INVENTION Having thus specially described and determined the nature of the present invention and the manner in which it is to be put into practice, it is claimed to claim as property and exclusive right.

1. - Activated piston valve, in particular a valve that can be activated characterized in that it comprises at least one pneumatic activating element associated with the shaft, the pneumatic activating element associated with the shaft, the activating element that is capable of selectively axially moving the shaft inside the frame, the activating element comprising a flexible membrane.

2. Valve according to claim 1, characterized in that it comprises a spring associated with the shaft, the spring that applies a force on the shaft in the opposite direction to the force applied by the pneumatic actuator for closing the valve.

3. Valve according to claim 1, characterized in that it comprises a spring associated with the shaft, the spring that applies a force on the shaft in the opposite direction to the force applied by the pneumatic activating element for the opening of the valve.

4. Valve according to claims 1, 2 or 3, characterized in that the flexible membrane is associated, through a first end region, opposite the first region, to a first fixed element, the membrane and the elements that delimit an airtight chamber, a chamber that can be filled with gas under pressure.

5. Valve according to any of claims 1 to 4, characterized in that the rod has a first end associated with the mobile element and a second end associated with a piston.

6. Valve according to claim 5, characterized in that the shaft comprises means for regulating the tension of the spring.

7. Valve according to any of claims 1 to 6, characterized in that it comprises a body opposite the pneumatic activating element and in which the frame is mounted removably, through at least two axial screws, the body It has a liquid inlet pipe and a liquid outlet pipe, the body also has a junction region between the pipes, in which there is a chamber.

8. - Valve according to claim 7, characterized in that the chamber has a substantially cylindrical format and has an axial through hole and at least one radial opening.

9. Valve according to claim 8, characterized in that the radial opening of the chamber is aligned with the liquid outlet pipe.

10. Valve according to claim 7, 8 or 9, characterized in that it comprises at least one elastic sealing ring located next to the chamber.

11. Valve according to claim 7, 8 or 9, characterized in that it comprises elastic sealing rings located in opposite axial portions of the chamber.

12. Valve according to claim 7, 8, 9, 10 or 11, characterized in that the piston moves axially inside the chamber and through the sealing rings.

13. Valve according to any of claims 7 to 12, characterized in that the chamber, the piston and the elastic sealing rings form an assembly that can be removed from the valve through the removal of the frame.

14. Valve according to any of claims 7 to 13, characterized in that the regulation of the tightness of the assembly formed by the chamber, the piston, the elastic sealing rings is carried out through the screws.

15. Valve according to claim 1, characterized in that it comprises a first and a second pneumatic activating element that is superimposed.

16. Valve according to claim 15, characterized in that the second pneumatic activating element comprises an associated impermeable flexible membrane, through a second end region, opposite the first end region, to a second fixed element, the membrane and the elements that delimit a hermetic chamber, said chamber that is filled with a gas under pressure.

17. Valve according to claims 15 and 16, characterized in that, when the first activating element is filled with gas under pressure, the second activating element is emptied, and as the first activating element is filled with gas, the rod moves in axial form for the position of the valve opening.

18. Valve according to any of claims 15 to 17, characterized in that it comprises a body opposite to the pneumatic activating elements and in which the frame is mounted, in a removable form, through at least two axial screws, the body has a liquid inlet pipe and a liquid outlet pipe, the body also has a region of union between the pipes, in which a chamber is arranged.

19. Valve according to claim 18, characterized in that the chamber has a substantially cylindrical format and has an axial passage hole and at least one radial opening.

20. Valve according to claim 19, characterized in that the radial opening of the chamber is aligned with the liquid outlet pipe.

21. Valve according to claim 18, 19 or 20, characterized in that it comprises at least one elastic sealing ring placed next to the chamber.

22. Valve according to claim 18, 19 or 20, characterized in that it comprises the elastic sealing rings placed in opposite axial portions of the chamber.

23. Valve according to claim 21 or 22, characterized in that the piston moves in shape axial inside the chamber and through the sealing rings. 24.- Valve according to any of claims 21 or 22, characterized in that the chamber, the piston and the elastic sealing rings form a removable assembly of the valve by removing the frame. 25.- Valve according to any of claims 18 to 23, characterized in that the regulation of the tightness of the assembly formed by the chamber, piston and elastic sealing rings is made through screws.