CN203395310U - Gradual decompression formula flow control valve - Google Patents

Abstract

A gradual decompression type flow regulating valve belongs to the technical field of valve control. A valve cavity is arranged in the valve body and is divided into an upper valve cavity and a lower valve cavity, a valve line is arranged between the upper valve cavity and the lower valve cavity, an inlet flow passage on the valve body is communicated with the upper valve cavity, and an outlet flow passage is communicated with the lower valve cavity; the pressure reducing assembly consists of an assembly outer sleeve, a first ring cover, a second ring cover and a throttle pipe, wherein the first ring cover and the second ring cover are fixedly connected to the two ends of the assembly outer sleeve; through the drift diameter change between the conical valve core and the valve line and the staggered right-angle flow channel in the pressure reduction assembly, high-speed flowing molecules in the high-pressure fluid generate impact and friction through drift diameter change and a plurality of times of flow direction changes, so that the purposes of consuming energy, finally realizing pressure reduction and preventing cavitation and cavitation erosion in the valve are achieved.

Description

A kind of progressive decompression type flow control valve

Technical field

The utility model relates to a kind of progressive decompression type flow control valve, belongs to technical field of valve control.

Background technique

Flow control valve is used for guaranteeing that steam pipeline has desired flow, prevents the erosion of valve inner seal member and cavitation erosion.It is arranged on steam pipeline, in service for preventing that it from producing erosion and cavitation erosion, require pipeline flow under any circumstance all must meet the safe traffic of some regulations, this safe traffic is controlled by flow control valve, and its safe traffic limit value can also prevent cavitation erosion and the unstability that under low flow condition, hole causes.

Because the pressure that pipeline runs well is supplied with by outside, therefore very large its pressure reduction of vapor tension fluctuation is up to more than 16Mpa, the ability that this just requires flow control valve must have the flash distillation avoided and prevent cavitation, and because more than 90% time of valve is all in closed condition, under the pressure difference of 16Mpa, requires to close and guarantee to reach long term zero and leak the difficult that just seems.Flow and the pressure reducing mode of existing flow control valve are varied, some employing circulation opposite flushings, the employing multiple step plug throttling having, the stacked adjusting in employing labyrinth having, but all respectively possessing some good points, which kind of mode also respectively has deficiency, they have certain restriction effect, many technical deficiencies such as the pressure drop effect that also coexists is thorough, serious cavitation erosion, noise content is large, vibration is fierce, leakage current amount is large, the life-span is short.Therefore, flow control valve is improved further perfect, be still the effective way that improves steam pipeline stable operation.

Summary of the invention

In order to overcome the deficiencies in the prior art, the utility model provides a kind of progressive decompression type flow control valve.

A decompression type flow control valve, is provided with valve pocket in valve body, valve pocket is divided into uuper valve chamber and lower valve chamber, between uuper valve chamber and lower valve chamber, is provided with valve line, and inlet channel and uuper valve chamber on valve body communicate, and outlet flow and lower valve chamber communicate;

Decompression assembly is comprised of assembly overcoat, the first ring cowling that is fixedly connected on assembly overcoat two ends and the second ring cowling, the throttle pipe of inserting in assembly overcoat and the first ring cowling and the second ring cowling,

A radial cross section of assembly overcoat wall portion is provided with a plurality of radial direction through hole, the first ring cowling and a second ring cowling radial cross section is separately provided with a plurality of radial direction through hole, plane towards valve pocket is provided with recessed step, the setting circumference of step surface is provided with a plurality of axial blind holes, and each radial direction through hole connects with each relative axial blind hole respectively, on a plurality of radial cross sections of throttling wall portion, be equipped with a plurality of radial direction through hole, the circumference of setting is provided with a plurality of axial holes, and each axial hole connects with each relative radial direction through hole respectively;

Filler valve pocket is pressed on valve pocket upper end by the support on top, by valve pad, decompression assembly is pressed in the valve plane in valve pocket, and makes to form between the valve pocket in assembly overcoat and valve body a ring runner; Valve rod lower end is provided with spool, spool is taper, valve line formation in spool and valve body valve pocket is sealed and matched, and the bar on spool top is slidably matched with the hole formation of decompression assembly, filler valve pocket successively, and stretch out outside support the tapped hole Bing Shi end that upper end screws support by screw thread; Support is provided with the lifting scale of valve rod.

The utility model is sealed and matched by taper valve core and valve line, and the shutoff that realizes runner is tight; And the staggered right angle runner that changes and reduce pressure in assembly by the latus rectum between taper valve core and valve line, make the mobile molecule of high-pressure liquid high speed produce and clash into and friction through the change of latus rectum variation and several times flow direction, reach and consume its energy, final realization reduced pressure, and prevents the object of cavitation cavitation erosion in valve.

The utlity model has compact structure, effective, the anti-cavitation of pressure drop, noise-reducing effect good, the advantage of long service life.

Accompanying drawing explanation

When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the utility model and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide further understanding of the present utility model, form a part of the present utility model, schematic description and description of the present utility model is used for explaining the utility model, do not form improper restriction of the present utility model, as schemed wherein:

Fig. 1 is structural representation of the present utility model.

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Embodiment

Obviously, the many modifications and variations that those skilled in the art do based on aim of the present utility model belong to protection domain of the present utility model.

Embodiment 1: as shown in Figure 1, a kind of progressive decompression type flow control valve, comprises valve body 1, decompression assembly 2, valve rod 3, support 4, filler valve pocket 5 valve pads 6.In valve body 1, be provided with valve pocket, valve pocket is divided into uuper valve chamber 103 and lower valve chamber 104, between uuper valve chamber 103 and lower valve chamber 104, is provided with valve line, and inlet channel 101 and uuper valve chamber 103 on valve body 1 communicate, and outlet flow 102 and lower valve chamber 104 communicate;

Decompression assembly 2 is comprised of assembly overcoat 201, the first ring cowling 202 that is fixedly connected on assembly overcoat 201 two ends and the second ring cowling 203, the throttle pipe 204 of inserting in assembly overcoat 201 and the first ring cowling 202 and the second ring cowling 203,

A radial cross section of assembly overcoat 201 wall portions is provided with a plurality of radial direction through hole, the first ring cowling 202 and the second ring cowling 203 radial cross section is separately provided with a plurality of radial direction through hole, plane towards valve pocket is provided with recessed step, the setting circumference of step surface is provided with a plurality of axial blind holes, and each radial direction through hole connects with each relative axial blind hole respectively, on a plurality of radial cross sections of throttle pipe 204 wall portions, be equipped with a plurality of radial direction through hole, the circumference of setting is provided with a plurality of axial holes, and each axial hole connects with each relative radial direction through hole respectively,

Filler valve pocket 5 is pressed on valve pocket upper end by the support 4 on top, by valve pad 6, decompression assembly 2 is pressed in the valve plane in valve pocket, and makes to form between the valve pocket in assembly overcoat 201 and valve body 1 ring runner; Valve rod 3 lower ends are provided with spool 301, spool 301 is taper, spool 301 is sealed and matched with the valve line formation in valve body 1 valve pocket, the bar on spool 301 tops is slidably matched with the hole formation of decompression assembly 2, filler valve pocket 5 successively, and stretch out outside support 4 the tapped hole Bing Shi end that upper end screws support 4 by screw thread; Support 4 is provided with the lifting scale 401 of valve rod 3.

The utility model is sealed and matched by taper valve core 301 and valve line, and the shutoff that realizes runner is tight; And the staggered right angle runner that changes and reduce pressure in assembly by the latus rectum between taper valve core 301 and valve line, make the mobile molecule of high-pressure liquid high speed produce and clash into and friction through the change of latus rectum variation and several times flow direction, reach and consume its energy, final realization reduced pressure, and prevents the object of cavitation cavitation erosion in valve.

In practical application, inlet channel 101 of the present utility model is arranged on to feed water pump outlet port, outlet flow 102 is arranged on the water tank of oxygen-eliminating device, upper poppet-valve bar 3, valve line in the conical surface on spool 301 and valve body 1 internal valve cavity is in open mode, high-pressure liquid in feed water pump is after the lower valve chamber 104 in valve body 1 is flowed through between spool 301 and valve line, the radial direction through hole entering on the first ring cowling 202 is realized decompression for the first time, and racing enters axial blind hole and spreads again the step hole being full of on the first ring cowling 202, realize second, three decompressions, then enter a plurality of axial holes and several radial direction through hole in throttle pipe 204, obtain thus the spatial variations of the turnover of several times right angle and runner, last again through the direction turnover of a runner of the second ring cowling 203, after entering uuper valve chamber 103, from runner exit 102, flow out, finally with lower hydrodynamic pressure, enter deaerator storage tank.The utility model with respect to scale 401 positions on support 4, can obtain accurate minimum stream value by regulating valve stem 3.

As mentioned above, embodiment of the present utility model is explained, but as long as not departing from fact inventive point of the present utility model and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection domain of the present utility model.

Claims (1)

1. a progressive decompression type flow control valve, is characterized in that being provided with valve pocket in valve body, and valve pocket is divided into uuper valve chamber and lower valve chamber, between uuper valve chamber and lower valve chamber, is provided with valve line, and inlet channel and uuper valve chamber on valve body communicate, and outlet flow and lower valve chamber communicate;

Decompression assembly is comprised of assembly overcoat, the first ring cowling that is fixedly connected on assembly overcoat two ends and the second ring cowling, the throttle pipe of inserting in assembly overcoat and the first ring cowling and the second ring cowling,

A radial cross section of assembly overcoat wall portion is provided with a plurality of radial direction through hole, the first ring cowling and a second ring cowling radial cross section is separately provided with a plurality of radial direction through hole, plane towards valve pocket is provided with recessed step, the setting circumference of step surface is provided with a plurality of axial blind holes, and each radial direction through hole connects with each relative axial blind hole respectively, on a plurality of radial cross sections of throttling wall portion, be equipped with a plurality of radial direction through hole, the circumference of setting is provided with a plurality of axial holes, and each axial hole connects with each relative radial direction through hole respectively;

Filler valve pocket is pressed on valve pocket upper end by the support on top, by valve pad, decompression assembly is pressed in the valve plane in valve pocket, and makes to form between the valve pocket in assembly overcoat and valve body a ring runner; Valve rod lower end is provided with spool, spool is taper, valve line formation in spool and valve body valve pocket is sealed and matched, and the bar on spool top is slidably matched with the hole formation of decompression assembly, filler valve pocket successively, and stretch out outside support the tapped hole Bing Shi end that upper end screws support by screw thread; Support is provided with the lifting scale of valve rod.