MXPA97002794A - Improved system for measuring fluid pressure for content valves - Google Patents

Abstract

The present invention relates to a system for improving the measurement of fluid pressure both at the inlet and the outlet of a control valve, the control valve being constructed and placed to use the fluid pressure measurement to control the flow through the control valve, comprising the system for improving the fluid pressure measurement, fluid flow conditioners constructed and placed to be fixed within the inlet and outlet of the control valve, a channel of substantially circular average, positioned outwardly of the fluid flow conditioners and downstream thereof, the practically circular averaging channels constructed and placed to encircle the inlet and outlet of the control valve, and conduits for conducting the fluid flowing from the channels from average substantially circular, to a fluid pressure measuring device

Description

IMPROVED SYSTEM FOR MEASURING THE PRESSURE OF FLUIDS FOR CONTROL VALVES FIELD OF THE INVENTION The present invention pertains to control valves; more particularly, the present invention relates to control valves which include a system that monitors the fluid pressure. BACKGROUND In recent years, it has become extremely important for control valve manufacturers to develop valve positioning mechanisms that can accurately detect fluid pressures on both the valve inlet and the valve outlet. The detected pressures can then be used for various purposes, including adjusting the flow of fluid through the control valve. Thus, accurate measurement of fluid pressure is critical. The decrease in the accuracy of the fluid pressure measurements through the control valves is due to complex components of the fluid flow, such as swirls, secondary or counter-rotating vortex flow, boundary layer flows and / or High-speed core flow. Therefore, an accurate measurement of the fluid pressure at both the inlet and the outlet of a control valve can only be obtained by minimizing these fluid flow components that would decrease the accuracy of the fluid pressure measurement. . Therefore, there is a need in the art to provide a system by which these fluid flow components that decrease the accuracy of the fluid pressure measurement in a control valve are minimized to increase the accuracy of the fluid. this measurement. COMPENDIUM The improved fluid pressure gauge system for control valves, according to the present invention, minimizes these aspects of fluid flow that decrease the accuracy of the fluid pressure measurement in the control valves. Specify, a fluid flow conditioner is placed upstream and inside an average, substantially circular channel. Once it has passed through the fluid flow conditioner and into the average channel, the fluid is conducted from this average channel to the fluid pressure measuring device. Thus, those components of the fluid flow that decrease the accuracy of the pressure measurement are removed by the fluid flow conditioner, before the fluid enters its fluid channel, on its way to the pressure measuring device. In the preferred embodiment, the fluid flow conditioner is located upstream of the flow path in the average channel on both the inlet and outlet sides of the control valve. DESCRIPTION OF THE DRAWINGS A better understanding of the improved system that measures the fluid flow pressure for control valves, according to the invention, can be obtained with refee to the figures, in which: Figure 1 is a cross-sectional view of a control valve incorporating the improved fluid pressure measuring system of the present invention; Figure 2 is an enlarged cross-sectional view of the valve inlet; Figure 3 is an enlarged cross-sectional view of the valve outlet; Figure 4 is an end view of the valve inlet; Figure 5 is a perspective view of a control valve, including an external manifold block; and Figure 6 is a view, with separate parts, of the control valve, shown in Figure 5, illustrating the attachment of the external manifold block to a flange of the control valve. DESCRIPTION OF THE MODALITIES Referring to Figure 1, it will be seen that the improved fluid pressure measuring system 10, according to the present invention, is used in connection with a globe-type control valve assembly 100. While illustrated and described for this set of globe type control valve 100, those of ordinary skill in the art will understand that the present invention can be used with a wide variety of different types of control valves. The control valve assembly 100 includes an internal flange 102, which has a plurality of axial bolt holes 104, for connecting the control valve assembly 100 to a flange on another valve or to a fluid conduit, such as a pipe. , elbow or T (not shown). A central opening 106 within the inlet flange 102 allows the fluid to pass into the interior of the control valve assembly 100. Located downstream of the inlet flange 102 is the body 110 of the control valve assembly 100. At the opposite end of the body 110 of the assembly 100 of the control valve, from the inlet flange 102, is an output flange 112. Similar to the input flange 102, the output flange 112 includes a plurality of bolt holes 114, which surround a central opening 116. Note that the conditioner 12 of the inlet fluid flow and the outlet fluid flow conditioner 52 they are placed within the openings 106 and 116 in the flanges 102 and 112, respectively. In Figure 14, it can be seen how the improved pressure gauge system 10 is placed on the inlet side of assembly 100 of the control valve. A similar arrangement for the output side of the control valve assembly 100 is shown in Figure 3. A fluid flow conditioner 12 is positioned to be mounted within the aperture 106. As shown in Figure 4, in FIG. Preferred embodiment, the fluid flow conditioner 12 includes thirty-five openings 14 within a plate portion 16, with dimensions to fit the opening 106 in the inlet flange 102. Extending downstream from the plate portion 16 on the inlet side is a short cylindrical section 18, which supplies both the radial path 38 of the fluid flow and a distal end 20 which places the fluid conditioner 12 through the top of a fluid. backrest 38 inside the housing 110 of the control valve. In Figure 3 it can be seen that on the output side of the control valve assembly 100 there is a second conditioner 52 of the fluid flow. The thirty-five openings 54 are in a plate portion 56, which abuts a backing 55 within the housing 110 of the control valve. Extending downstream from the plate portion 56 is a short cylindrical section 58 which provides a radial flow path 38 and a distal end 50 with an outer ring 62 for coupling the opening 116 in the flange 112 on the outlet side of the assembly 100. of the control valve. The thirty-five openings are arranged in a predetermined pattern in each of the conditioner 12 of the inflow fluid and the conditioner 52 of the outflow fluid flow, to minimize these components of the fluid flow that decrease the accuracy of the flow. pressure measurement. As previously indicated, both the cylindrical section 18 on the inlet side of the valve 100 and the short cylindrical section 58 on the outlet side of the valve 60, include a plurality of radial trajectories 38 of the fluid. Out of the trajectories 38 of the fluid flow in the sides both inlet and outlet of the control valve 100, there is an averaging channel, in which the fluid flows with the conditioned flow. The fluid flows into the channel of averaging at either side of the inlet or outlet of the valve 100 and is substantially perpendicular to the flow of fluid through the flow conditioner on either side of the control valve 100. The fluid with the conditioned flow is collected in the average inlet channel 42, before passing to a measuring device 48 of the fluid pressure. Referring again to Figures 1 and 2, you can see that, on the inlet side, the fluid with the conditioned flow passes through the paths 38 of the fluid flow, forms in the short cylindrical section 18 of the flow conditioner 12, thence through the radial passage 44 formed in the flange 102 inlet to a set of tube tapers 46, tapered or straight, formed in the inlet flange 102 at the end of the radial passage 44. such a configuration can be used on either inlet or outlet side of the assembly 100 of the control valve. With reference to Figures 1 and 3, it can be seen that the exit side of the control valve assembly 100 is an alternative configuration for the opening 84 leading away from the average chamber 82 and the pressure measuring device 88. of the fluid. Instead of passing directly through the output flange 112, an axial passage 84 extends from the average chamber 82. This axial passage 84 then rotates at a right angle and terminates in a set of conical or straight threads, 86, formed in the valve body 110. Such a configuration can be used on any input or output side of assembly 100 of the control valve. In Figures 5 and 6, yet another configuration of a control valve assembly 100 is shown, which incorporates the improved fluid pressure measuring system, according to the present invention. Specifically, a manifold block 60 is screwed to both the inlet flange 102 and the outlet flange 112. The configuration of the fluid flow from the average chambers, 42 and 82, is similar to that shown in Figure 2. For To ensure a leak-proof connection between one or both flanges, at any end of the control valve assembly 100, a variety of different hardware arrangements can be used. Shown in Figure 6 is an example of a hardware connection using a small connecting collar 62 enclosed by two O-rings, 64. A valve manifold 68 is connected, in sealed form, to manifold block 60, which is extends between two flanges at either end of the control valve assembly 100. A differential pressure transmitter 69 can be connected, in sealed form, to the valve manifold 68. The inlet and outlet pressures can be blocked by closing the valves 66. A third valve 67 can be opened to balance the pressure to the differential pressure transmitter for calibration.

A system is provided by the present invention for improving the measurement of fluid pressure on either the inlet side of a control valve, the outlet side of a control valve, or both. While preferred embodiments have been explained in the above description, those of ordinary skill in the art will understand that variants are possible in the described embodiments. These variants will be within the scope and meaning of the appended claims.

Claims (19)

1. CLAIMS 1. A system to improve the measurement of the pressure both in the entrance and in the exit of a control valve, this control valve is constructed and arranged to use the measurement of the fluid pressure in the flow control, this system that improves the measurement of fluid pressure includes: -a fluid flow conditioner; a channel, substantially circular, for averaging the flow, substantially outwardly from and downstream of the fluid flow conditioner; and a conduit, for carrying the fluid flowing from the substantially circular average channel to a device that measures the fluid pressure.
2. 2. The system, as defined in the claim 1, in which the fluid flow conditioner comprises a plurality of openings, formed in a plate mounted axially within the control valve.
3. The system, as defined in claim 1, wherein the flow of fluid to the substantially circular, average channel is through a plurality of lumen flow paths, substantially radially positioned to this fluid flow. through the control valve.
4. 4. A system for measuring the pressure of the fluid in a control valve, with a pressure measuring device, this control valve has an input mounting flange, an output mounting flange and a valve body between them, the system comprises : an inlet fluid flow conditioner, placed inside the inlet mounting flange; an input, substantially circular, inlet channel substantially positioned outwardly from and downstream of the fluid flow conditioner; an outlet fluid flow conditioner, placed inside the outlet mounting flange; a channel that averages the outflow, substantially circular, positioned essentially outward from and downstream of the outlet fluid flow conditioner; a passage for driving the fluid from the substantially circular, inlet flow average channel to the pressure measuring device; and a passage for driving the fluid from the channel of the average, substantially circular, outflow to the pressure measuring device.
5. The system, as defined in claim 4, wherein the passage for driving the fluid from an average, substantially circular inflow channel to the pressure measuring device passes through the valve body.
6. The system, as defined in claim 4, in which the passage for driving the fluid from the average, substantially circular outlet flow channel, to the pressure measuring device, passes through the valve body.
7. The system, as defined in claim 4, wherein the substantially circular, inlet flow average channel is fed by a plurality of substantially radial flow paths.
8. 8. The system, as defined in claim 4, wherein the substantially circular outflow averaging channel is fed by a plurality of substantially radial flow paths.
9. 9. An adjustable flow control valve which is sensitive to inlet and outlet pressures, this adjustable flow control valve comprises: an inlet assembly; an output assembly; a valve body between the input assembly and the output assembly; an inlet fluid flow conditioner, placed inside the inlet assembly; a channel that averages the substantially circular inflow, placed substantially outside from, and downstream of, the inflow conditioner; an outlet fluid flow conditioner, positioned within the outlet assembly; an average flow channel, substantially circular, positioned substantially outside from, and downstream of, the outlet fluid flow conditioner; a passage for conducting the fluid from the substantially circular, inlet flow channel; and a passage for driving the fluid from the substantially circular exit flow channel.
10. The control valve, as defined in claim 9, wherein the passageway for conducting the fluid from the substantially circular, inlet flow average channel passes through the valve body.
11. The control valve, as defined in claim 9, wherein the passageway for conducting the fluid from the substantially circular outlet flow average channel passes through the valve body.
12. The control valve, as defined in claim 9, in which the substantially circular input mean channel is fed by a plurality of substantially radial flow paths.
13. The control valve, as defined in claim 9, wherein the substantially circular exit mean channel is fed by a plurality of substantially radial flow paths.
14. 14 The control valve, as defined in claim 9, further comprising a manifold block in fluid communication with the passage, for conducting the fluid from the average, substantially circular flow channel, and the passage for driving the fluid from the channel of average flow exit, substantially circular.
15. 15. A method for measuring the fluid flow pressure with a fluid pressure measuring device at the inlet or outlet of a control valve, this method comprising the steps of: conditioning the flow of the fluid; driving the flow of conditioned fluid to a substantially circular flow average channel, positioned adjacent to, and downstream from, the fluid flow conditioner; and driving the fluid from the substantially circular flow average channel to the fluid flow pressure measuring device.
16. 16. The method, as defined in claim 15, wherein the flow of the fluid to the substantially circular flow average channel is through a plurality of flow paths, positioned substantially radially to the fluid flow.
17. 17. A method to improve the measurement of fluid pressure in a control valve, this measurement of fluid pressure is detected by a fluid pressure measuring device, this method comprises the steps of: conditioning the flow of the fluid substantially at the entrance to the control valve; driving the conditioned fluid flow to an essentially circular, inlet flow channel, positioned outside of, and downstream from, the fluid flow conditioner; driving the flow of conditioned fluid from the substantially circular, inlet flow average channel to the fluid pressure measuring device; conditioning the fluid flow substantially at the outlet of the control valve; driving the flow of the conditioned fluid to an average, substantially circular outflow channel, positioned to the exterior from, and downstream of, the fluid flow conditioner; driving the flow of the conditioned fluid from the substantially circular outflow average channel to the fluid pressure measuring device.
18. 18. The method, as defined in claim 17, wherein the flow of the fluid to the average, substantially circular, flow channel is through a plurality of flow paths, substantially radially positioned to the flow of the flow. fluid through the control valve.
19. 19. The method as defined in the claim 17, in which the flow of the fluid to the average flow channel, substantially circular, is through a plurality of flow paths, placed substantially radially to the fluid flow through the control valve.