CN202646752U

CN202646752U - Three-stage pressure reduction regulating valve

Info

Publication number: CN202646752U
Application number: CN 201220113328
Authority: CN
Inventors: 孙健; 裘叶琴
Original assignee: ZHEJIANG SANFANG CONTROL VALVE CO Ltd
Current assignee: ZHEJIANG SANFANG CONTROL VALVE CO Ltd
Priority date: 2012-03-23
Filing date: 2012-03-23
Publication date: 2013-01-02
Anticipated expiration: 2022-03-23

Abstract

The utility model discloses a three-stage pressure reduction regulating valve, which comprises a valve body, a valve seat, a sleeve and a valve core, wherein the valve seat is of a cylindrical structure; the downward extending end of the valve seat is connected with the valve body; the lower end of the valve seat is provided with an orifice; the sleeve is arranged above the valve seat, and upwards extends to be connected with the valve body; the lower end of the sleeve is provided with an orifice; the valve core is in an inverted cup shape and is divided into an upper section and a lower section; the outer wall of the upper section valve core and the inner wall of the sleeve are in sliding fit; the diameter of the outer wall of the lower section valve core is less than that of the outer wall of the upper section valve core, and the lower section valve core and the inner wall of the valve seat are in the sliding fit; and the upper part of the lower section valve core is provided with an orifice. When the three-stage pressure reduction regulating valve disclosed by the utility model is used in occasions with higher differential pressure, through three-stage pressure reduction, the pressure of a medium when passing through every pressure reduction section is not less than the saturated vapor pressure of liquid, so that the medium is prevented from cavitated under a non-blocking state all along. The three-stage pressure reduction regulating valve is good in continuous regulation performance.

Description

A kind of three grades of decompression valves

Technical field

The utility model relates to a kind of industrial process control system control valve, specifically, relates to a kind of three grades of decompression valves, is applicable to the flow of high temperature, High Pressure Difference fluid and the accuracy-control system of pressure.

Background technique

Along with the development of oil, chemical industry and atomic energy industry, also more and more, more and more higher to the requirement of modulating valve, especially the purposes of high-differential-pressure regulating valve is more and more wider.In recent years each state all at the high-differential-pressure regulating valve of the various parameters of development, these valves can prevent cavitation effectively under High Pressure Difference, and the withstand corrosion scrape resistence, arranged long working life.Along with the progress of society and development people propose higher requirement to working environment, control valve is one of main industrial noise source, so significance and the attention rate of the noise control of control valve all constantly improved.

Summary of the invention

In order to adapt to the needs of control valve industry development, under the High Pressure Difference operating mode high-velocity fluid to trim wash away and flash distillation and cavitation cause to a certain degree damage to valve, the utility model aims to provide and can prevent effectively that the liquid cavitation from producing cavitation, improve working life, also can reduce significantly the reduction valve of noise simultaneously.

The technological scheme that its technical problem that solves the utility model adopts is:

A kind of three grades of decompression valves comprise valve body, valve seat, sleeve, spool, and valve seat is cylindrical structure, extending end connects valve body downwards, and in the lower end throttle orifice being set, sleeve is located at the valve seat top, extends upward with valve body to be connected, the sleeve lower end arranges throttle orifice, spool is the handstand cup-shaped, minute two sections, and epimere spool outer wall and sleeve lining are slidingly matched, hypomere spool outer diameter is slidingly matched less than epimere spool outer diameter and with valve base inner wall, on hypomere spool top throttle orifice is set.

Further, sleeve divides upper bush and lower sleeve two-part, and both are positioned at the inwall joint and are provided with the spring energy-storage seal ring.

Further, three grades of decompression valves according to claim 1 is characterized in that spool top is provided with through hole.

The beneficial effects of the utility model are, in the larger occasion of pressure reduction, by three grades of step-downs, pressure when guaranteeing medium by each section of falling is not less than the saturation vapour pressure of liquid, medium is in the unblock situation all the time, prevents the generation of cavitation, have good continuously adjusting function, greatly improve simultaneously the working life of valve under harsh working condition, greatly reduced simultaneously noise.

Description of drawings

Fig. 1 is the utility model general assembly structural drawing

Fig. 2 is the utility model pressure relief assembly sectional drawing

Among Fig. 1: 1. valve body 2. gasket seals 3. valve seats 4. lower sleeves 5. spools 6. spring energy-storage seal rings 7. upper bushes 8. seal rings 9. valve gaps 10. packing box assemblys 11. fillers are pressed 15. pairs of folders of nail 12. hold-down grids 13. filler gland nuts, 14. filler hold-down bolts indicator panel, 16. actuators

Embodiment

As shown in Figure 1, casting valve body 1, runner is the S cleanliness, and valve capacity is large.Valve seat 3 is cylindrical structure, extending end connects valve body 1 downwards, and in the lower end throttle orifice is set, sleeve is located at the valve seat top, sleeve divides upper bush 7 and lower sleeve 4 two-part, both are positioned at the inwall joint and are provided with spring energy-storage seal ring 6, upper bush 7 is connected with valve body 1, lower sleeve 4 arranges throttle orifice, and spool 5 is the handstand cup-shaped, minute two sections, epimere spool outer wall and sleeve lining are slidingly matched, hypomere spool outer diameter is slidingly matched less than epimere spool outer diameter and with valve base inner wall, on hypomere spool top throttle orifice is set, and spool top is provided with through hole.

As shown in Figure 2, when MEDIA FLOW plays first order decompression process during through the one-level vent, medium through the one-level decompression plays second level decompression process when flowing through the porous type spool, symmetrical porous type valve seat plays third level decompression process through flowing through behind the spool, these three step-down Cheng Jun finish by a cross section that can connect adjusting, so the decompression of every one-level all is accurate control, greatly improves degree of regulation.Fluid flows through three throttling cross sections in valve pocket, and throttleng surface of every mistake all is flow resistance, shares a part of pressure reduction, thereby reduces rate of flow of fluid, effectively prevents valve cavitation erosion, cavitation, spool vibration.In the structure of these three grades of porous restrictions, realized the design of multithread road, can reduce noise and reach 15 decibels.

As shown in Figure 2, three grades of sleeves make high-pressure liquid expand and effectively step-down by axial throttling, buffering, reach the purpose that prevents cavitation and cavitation erosion.

As shown in Figure 2, spool adopts balanced structure, and the suffered not stable force of spool is little, is active in one's movements, and Location accuracy is high;

As shown in Figure 2, sealing adopts the elastic energy storage seal ring to seal on the spool, and integral sealing effect is good, and leakage rate can reach V ~ VI level;

What more than enumerate only is a specific embodiment of the present utility model.Obviously, the utility model can also have many distortion, and all distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection domain of the present utility model.

Claims

1. three grades of decompression valves, comprise valve body, valve seat, sleeve, spool, it is characterized in that, described valve seat is cylindrical structure, extending end connects valve body downwards, and in the lower end throttle orifice is set, described sleeve is located at the valve seat top, extend upward with valve body and be connected, the sleeve lower end arranges throttle orifice, and described spool is the handstand cup-shaped, divide two sections, epimere spool outer wall and sleeve lining are slidingly matched, and hypomere spool outer diameter is slidingly matched less than epimere spool outer diameter and with valve base inner wall, on hypomere spool top throttle orifice are set.

2. three grades of decompression valves according to claim 1 is characterized in that, described sleeve divides upper bush and lower sleeve two-part, and both are positioned at the inwall joint and are provided with the spring energy-storage seal ring.

3. three grades of decompression valves according to claim 1 is characterized in that spool top is provided with through hole.