CN103939623B - Extra high pressure steam atmospheric valve - Google Patents

Extra high pressure steam atmospheric valve Download PDF

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Publication number
CN103939623B
CN103939623B CN201410187340.XA CN201410187340A CN103939623B CN 103939623 B CN103939623 B CN 103939623B CN 201410187340 A CN201410187340 A CN 201410187340A CN 103939623 B CN103939623 B CN 103939623B
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CN
China
Prior art keywords
valve
spool
pilot control
control chamber
guide
Prior art date
Application number
CN201410187340.XA
Other languages
Chinese (zh)
Other versions
CN103939623A (en
Inventor
吴杰
谭志波
邓凡
沈志猷
张勇
Original Assignee
无锡卓尔阀业有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 无锡卓尔阀业有限公司 filed Critical 无锡卓尔阀业有限公司
Priority to CN201410187340.XA priority Critical patent/CN103939623B/en
Publication of CN103939623A publication Critical patent/CN103939623A/en
Application granted granted Critical
Publication of CN103939623B publication Critical patent/CN103939623B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32Details
    • F16K1/34Cutting-off parts, e.g. valve members, seats
    • F16K1/36Valve members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32Details
    • F16K1/34Cutting-off parts, e.g. valve members, seats
    • F16K1/42Valve seats
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00Devices for relieving the pressure on the sealing faces
    • F16K39/02Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00Means in valves for absorbing fluid energy, e.g. cushioning of opening or closure movement, eliminating of vibrations of the valve member
    • F16K47/02Means in valves for absorbing fluid energy, e.g. cushioning of opening or closure movement, eliminating of vibrations of the valve member for preventing water-hammer or noise, e.g. for sanitary applications, toilet flush reservoirs
    • F16K47/023Means in valves for absorbing fluid energy, e.g. cushioning of opening or closure movement, eliminating of vibrations of the valve member for preventing water-hammer or noise, e.g. for sanitary applications, toilet flush reservoirs for preventing water-hammer, e.g. damping of the valve movement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00Means in valves for absorbing fluid energy, e.g. cushioning of opening or closure movement, eliminating of vibrations of the valve member
    • F16K47/08Means in valves for absorbing fluid energy, e.g. cushioning of opening or closure movement, eliminating of vibrations of the valve member for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths

Abstract

The present invention relates to extra high pressure steam atmospheric valve, comprise valve body, valve gap and trim, valve body center is provided with valve pocket, trim comprises valve rod, valve seat, porous sleeve and spool, it is characterized in that: spool top is provided with pilot control chamber, pilot control chamber bottom centre is provided with first via, and first via is communicated with valve base center hole by leader channel; It is indoor that valve rod lower end is placed in pilot control, valve rod lower end is set with guide's stroke spring, guide's stroke spring upper end is connected with the step on valve rod, top, guide's stroke spring lower end is pressed in bottom, pilot control chamber, valve rod lower end is provided with seal head, and seal head can be sealed and matched with edge, first via upper end; The upper end open place of pilot control chamber is provided with transparent cover, and the following position of step on valve rod is enclosed in pilot control chamber and has axial stroke by transparent cover, and transparent cover is provided with guide's balance pipe. The present invention is applicable to high temperature, High Pressure Difference, steam evacuation occasion that seal request is high, is also applicable to other gases at high pressure emptying.

Description

Extra high pressure steam atmospheric valve

Technical field

The present invention relates to a kind of atmospheric valve, specifically a kind of extra high pressure steam atmospheric valve of the steam evacuation occasion or other gases at high pressure emptying occasion that are applicable to high temperature, High Pressure Difference.

Background technology

In prior art, common atmospheric valve generally adopts porous sleeve cage valve or low noise cage valve, in use, spool, sealing surface of seat are washed away by high-velocity fluid very easily, and sealing surface is suffered damage, and cause valve to fit badly, leak greatly, cause the energy to be wasted in a large number. Particularly high at high temperature, High Pressure Difference, sealing class requirement, open steam evacuation occasion rapidly, existing common atmospheric valve is more difficult to be suitable for, and therefore needs to design a kind of extra high pressure steam atmospheric valve.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of extra high pressure steam atmospheric valve is provided, its structural design is ingenious rationally, be specially adapted to high temperature, High Pressure Difference, sealing class requirement high, open steam evacuation occasion rapidly, be also applicable to other gases at high pressure emptying occasion.

According to technical scheme provided by the invention: extra high pressure steam atmospheric valve, comprise valve body, valve gap and trim, described valve body center is provided with valve pocket, described trim comprises valve rod, valve seat, porous sleeve and spool, and valve seat and porous sleeve are contained in valve pocket, and valve seat is positioned at porous sleeve below, spool is loaded in porous sleeve, valve gap is arranged on valve body and seals valve pocket, and valve rod is through valve gap, and valve rod lower end is connected with spool; Valve body is provided with valve inlet and valve outlet port, and valve inlet is communicated with valve base center hole, and valve outlet port is communicated with valve seat and porous sleeve peripheral space; It is characterized in that: described spool top is provided with pilot control chamber, described pilot control chamber bottom centre is provided with first via, and described first via is communicated with valve base center hole by leader channel; It is indoor that valve rod lower end is placed in pilot control, valve rod lower end is set with guide's stroke spring, guide's stroke spring upper end is connected with the step on valve rod, top, guide's stroke spring lower end is pressed in bottom, pilot control chamber, valve rod lower end is provided with seal head, and sealing head can be sealed and matched with edge, first via upper end; The upper end open place of described pilot control chamber is provided with transparent cover, and the following position of step on described valve rod is enclosed in pilot control chamber and has axial stroke by transparent cover, and transparent cover is provided with guide's balance pipe.

As a further improvement on the present invention, described spool bottom is provided with several guide's apertures, above several guide's apertures, be provided with the chamber of confluxing being communicated with guide's aperture, described in the chamber of confluxing is communicated with pilot control chamber by first via, guide's aperture and the chamber formation leader channel that confluxes.

As a further improvement on the present invention, described transparent cover is threaded connection and coordinates with the upper end open of pilot control chamber, and the position of transparent cover can turn adjustment.

As a further improvement on the present invention, described spool lower surface is provided with annular external seal platform, the interior perimeter surface of this annular external seal platform is inclined-plane, described valve seat upper surface is provided with sealing platform in the annular raising up, and in described annular, the sealing outer surface of platform and the interior perimeter surface of described annular external seal platform are sealed and matched.

As a further improvement on the present invention, the interior perimeter surface of described annular external seal platform is straight inclined-plane, and in described annular, the outer surface of sealing platform is the arc-shaped curved surface of outwards heaving.

As a further improvement on the present invention, described porous sleeve bottom is provided with one section of dead track that there is no fenestra, and spool and valve seat open afterwards and before not departing from dead track, porous sleeve fenestra is not opened.

As a further improvement on the present invention, the length of described dead track is 10 ~ 15% of spool stroke scope.

As a further improvement on the present invention, described spool perisporium is provided with spool limited step, and described porous sleeve upper inside wall is provided with sleeve limited step, and while moving to limit travel on spool, spool limited step contacts cooperation with sleeve limited step.

As a further improvement on the present invention, described spool limited step and sleeve limited step are sloping platform rank.

As a further improvement on the present invention, the sleeve limited step position on described porous sleeve is also provided with auxiliary exhaust ports.

Extra high pressure steam atmospheric valve of the present invention is mainly for the operating mode particular design such as steam evacuation occasion or other gases at high pressure emptying research and development of high temperature, High Pressure Difference, its compared with prior art, tool has the following advantages:

(1) valve core structure of the present invention is designed to guide's balanced type valve core structure, and it has reduced the requirement to actuator stem force, joins less executing agency and just can realize tight seal under large pressure reduction operating mode; Can also reduce work noise, reduce fluid scouring loss simultaneously.

(2) spool of the present invention, valve seat construction and their mode of being sealed and matched have formed stealthy hermetically-sealed construction, and in the time of spool unlatching work, sealing surface is not subject to fluid scouring, thereby in theory without the possibility of washing away damage, the service life of having improved equipment.

(3) porous sleeve of the present invention bottom is provided with one section of dead track that there is no fenestra, and washing away also that it can make that spool, sealing surface of seat be subject to reduces greatly, and greatly improve service life.

Brief description of the drawings

Fig. 1 is the structural representation of the embodiment of the present invention.

Fig. 2 is the structure enlarged diagram of trim in Fig. 1.

Fig. 3 is the A portion enlarged diagram in Fig. 2.

Description of reference numerals: 1-valve body, 2-valve gap, 3-valve rod, 4-transparent cover, 5-porous sleeve, 5a-upper bush, 5b-lower sleeve, 6-spool, 7-guide's stroke spring, 8-valve outlet port, 9-valve seat, 10-valve inlet, 11-guide's balance pipe, 12-step, 13-pilot control chamber, 14-sleeve limited step, 15-auxiliary exhaust ports, 16-fenestra, 17-spool limited step, 18-guide's aperture, the 19-chamber of confluxing, the first via of 20-, 21-seal head, 22-annular external seal platform, sealing platform in 23-annular.

Detailed description of the invention

Below in conjunction with concrete drawings and Examples, the invention will be further described.

As shown in the figure: the extra high pressure steam atmospheric valve in embodiment is mainly made up of valve body 1, valve gap 2 and trim, wherein trim is mainly made up of valve rod 3, valve seat 9, porous sleeve 5 and spool 6.

As shown in Figure 1 and Figure 2, described valve body 1 center is provided with valve pocket, and valve seat 9 and porous sleeve 5 are contained in valve pocket, valve seat 9 is positioned at porous sleeve 5 belows, and spool 6 is loaded in porous sleeve 5, and valve gap 2 is arranged on valve body 1 and seals valve pocket, valve rod 3 is through valve gap 2, and valve rod 3 lower ends are connected with spool 6; Valve body 1 is provided with valve inlet 10 and valve outlet port 8, and valve inlet 10 is communicated with valve seat 9 centre bores, and valve outlet port 8 is communicated with valve seat 9 and porous sleeve 5 peripheral space; Described spool 6 tops are provided with pilot control chamber 13, and described pilot control chamber 13 bottom centre are provided with first via 20, and described first via 20 is communicated with valve seat 9 centre bores by leader channel; Valve rod 3 lower ends are placed in pilot control chamber 13, valve rod 3 lower ends are set with guide's stroke spring 7, guide's stroke spring 7 upper ends are connected with the step 12 on valve rod 3, guide's stroke spring 7 tops, lower end are pressed in 13 bottoms, pilot control chamber, valve rod 3 lower ends are provided with seal head 21, and sealing 21 can be sealed and matched with first via 20 edges, upper end; The upper end open place of described pilot control chamber 13 is provided with transparent cover 4, and the following position of step 12 on described valve rod 3 is enclosed in pilot control chamber 13 and has axial stroke by transparent cover 4, and transparent cover 4 is provided with guide's balance pipe 11.

When concrete application, in the time of needs Open valve, valve rod 3 first moves up, the steam of valve inlet 10 first enters spool 6 superjacent air spaces through leader channel, first via 20, pilot control chamber 13 and guide's balance pipe 11, make spool pressure at two ends balance Shang Xia 6, just can open rapidly valve as long as join so less executing agency. Above-mentioned spool 6 structures are guide's balanced type spool 6 structures, and it has reduced the requirement to actuator stem force, join less executing agency and just can realize tight seal under large pressure reduction operating mode; Can also reduce work noise, reduce fluid scouring loss simultaneously.

As shown in Figure 1 and Figure 2, in the embodiment of the present invention, described spool 6 bottoms are provided with several guide's apertures 18, above several guide's apertures 18, be provided with the chamber 19 of confluxing being communicated with guide's aperture 18, the described chamber 19 of confluxing is communicated with pilot control chamber 13 by first via 20, and guide's aperture 18 and the chamber 19 of confluxing form leader channel.

As shown in Figure 1 and Figure 2, in the embodiment of the present invention, described transparent cover 4 is threaded connection and coordinates with the upper end open of pilot control chamber 13, and the position of transparent cover 4 can turn adjustment. Be conducive to like this come according to actual service condition the stroke of regulating spool 6, widened the scope of application of the present invention.

As shown in Figure 2 and Figure 3, described spool 6 lower surfaces are provided with annular external seal platform 22, the interior perimeter surface of this annular external seal platform 22 is inclined-plane, described valve seat 9 upper surfaces are provided with sealing platform 23 in the annular raising up, and in described annular, the sealing outer surface of platform 23 and the interior perimeter surface of described annular external seal platform 22 are sealed and matched. Such spool 6, valve seat 9 structures and their mode of being sealed and matched have formed stealthy hermetically-sealed construction, and in the time that spool 6 is opened work, sealing surface is not subject to fluid scouring, thereby in theory without the possibility of washing away damage, the service life of having improved equipment.

In addition, the interior perimeter surface of described annular external seal platform 22 is straight inclined-plane, and in described annular, the outer surface of sealing platform 23 is the arc-shaped curved surface of outwards heaving. The mode of being sealed and matched like this can further ensure sealing effectiveness.

As shown in Figure 2, described porous sleeve 5 bottoms are provided with one section of dead track that there is no fenestra 16, and spool 6 opens afterwards with valve seat 9 and before not departing from dead track, porous sleeve 5 fenestras 16 are not opened. Preferably, the length of described dead track is 10 ~ 15% of spool 6 stroke range.

When concrete application, in the time that spool 6 and valve seat 9 are opened, before spool 6 departs from dead track, the fenestra 16 of porous sleeve 5 is not opened, and now, except the gap stream of spool 6 and porous sleeve 5, almost there is no flow; In the time that spool 6 strokes continue to increase, the fenestra 16 of porous sleeve 5 is opened, and now the cross section of fluid channel between spool 6 and valve seat 9 sealing surfaces is much larger than the flow area of porous sleeve 5 fenestras 16; At this moment vapor stream just declines much through the flow velocity of spool 6, valve seat 9, and what spool 6, valve seat 9 sealing surfaces were subject to washes away also and will reduce far away, and greatly improve service life.

As shown in Figure 1 and Figure 2, in the embodiment of the present invention, described spool 6 perisporiums are provided with spool limited step 17, and described porous sleeve 5 upper inside wall are provided with sleeve limited step 14, while moving to limit travel on spool 6, spool limited step 17 contacts cooperation with sleeve limited step 14. Preferably, described spool limited step 17 and sleeve limited step 14 are sloping platform rank. In addition, sleeve limited step 14 positions on described porous sleeve 5 are also provided with auxiliary exhaust ports 15, and in the time that spool 6 moves up, the position of spool limited step 17 tops can be accumulated part steam, and this part steam can be discharged from auxiliary exhaust ports 15.

As shown in Figure 1 and Figure 2, in the embodiment of the present invention, described porous sleeve 5 is made up of upper bush 5a and lower sleeve 5b, described fenestra 16 is only arranged on lower sleeve 5b, described sleeve limited step 14 is arranged at inner edge bead place, upper bush 5a lower end, and described auxiliary exhaust ports 15 is arranged on upper bush 5a.

Claims (9)

1. extra high pressure steam atmospheric valve, comprise valve body (1), valve gap (2) and trim, described valve body (1) center is provided with valve pocket, described trim comprises valve rod (3), valve seat (9), porous sleeve (5) and spool (6), valve seat (9) and porous sleeve (5) are contained in valve pocket, valve seat (9) is positioned at porous sleeve (5) below, spool (6) is loaded in porous sleeve (5), valve gap (2) is arranged on valve body (1) and goes up and seal valve pocket, valve rod (3) is through valve gap (2), and valve rod (3) lower end is connected with spool (6); Valve body (1) is provided with valve inlet (10) and valve outlet port (8), and valve inlet (10) is communicated with valve seat (9) centre bore, and valve outlet port (8) is communicated with valve seat (9) and porous sleeve (5) peripheral space; It is characterized in that: described spool (6) top is provided with pilot control chamber (13), described pilot control chamber (13) bottom centre is provided with first via (20), and described first via (20) is communicated with valve seat (9) centre bore by leader channel; Valve rod (3) lower end is placed in pilot control chamber (13), valve rod (3) lower end is set with guide's stroke spring (7), guide's stroke spring (7) upper end is connected with the step (12) on valve rod (3), top, guide's stroke spring (7) lower end is pressed in bottom, pilot control chamber (13), valve rod (3) lower end is provided with seal head (21), and sealing head (21) can be sealed and matched with first via (20) edge, upper end; The upper end open place of described pilot control chamber (13) is provided with transparent cover (4), the following position of step (12) on described valve rod (3) is enclosed in pilot control chamber (13) and has axial stroke by transparent cover (4), and transparent cover (4) is provided with guide's balance pipe (11);
Described spool (6) lower surface is provided with annular external seal platform (22), the interior perimeter surface of this annular external seal platform (22) is inclined-plane, described valve seat (9) upper surface is provided with sealing platform (23) in the annular raising up, and in described annular, the outer surface of sealing platform (23) and the interior perimeter surface of described annular external seal platform (22) are sealed and matched.
2. extra high pressure steam atmospheric valve as claimed in claim 1, it is characterized in that: described spool (6) bottom is provided with several guide's apertures (18), be provided with the chamber of confluxing (19) being communicated with guide's aperture (18) in the top of several guide's apertures (18), the described chamber of confluxing (19) is communicated with pilot control chamber (13) by first via (20), and guide's aperture (18) and the chamber of confluxing (19) form leader channel.
3. extra high pressure steam atmospheric valve as claimed in claim 1, is characterized in that: described transparent cover (4) is threaded connection and coordinates with the upper end open of pilot control chamber (13), and the position of transparent cover (4) can turn adjustment.
4. extra high pressure steam atmospheric valve as claimed in claim 1, is characterized in that: the interior perimeter surface of described annular external seal platform (22) is straight inclined-plane, and in described annular, the outer surface of sealing platform (23) is the arc-shaped curved surface of outwards heaving.
5. extra high pressure steam atmospheric valve as claimed in claim 1, it is characterized in that: described porous sleeve (5) bottom is provided with one section of dead track that there is no fenestra (16), spool (6) opens afterwards with valve seat (9) and before not departing from dead track, porous sleeve (5) fenestra (16) is not opened.
6. extra high pressure steam atmospheric valve as claimed in claim 5, is characterized in that: the length of described dead track is 10 ~ 15% of spool (6) stroke range.
7. extra high pressure steam atmospheric valve as claimed in claim 1, it is characterized in that: described spool (6) perisporium is provided with spool limited step (17), described porous sleeve (5) upper inside wall is provided with sleeve limited step (14), while moving to limit travel on spool (6), spool limited step (17) contacts cooperation with sleeve limited step (14).
8. extra high pressure steam atmospheric valve as claimed in claim 7, is characterized in that: described spool limited step (17) and sleeve limited step (14) are sloping platform rank.
9. extra high pressure steam atmospheric valve as claimed in claim 7, is characterized in that: sleeve limited step (14) position on described porous sleeve (5) is also provided with auxiliary exhaust ports (15).
CN201410187340.XA 2014-05-05 2014-05-05 Extra high pressure steam atmospheric valve CN103939623B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410187340.XA CN103939623B (en) 2014-05-05 2014-05-05 Extra high pressure steam atmospheric valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410187340.XA CN103939623B (en) 2014-05-05 2014-05-05 Extra high pressure steam atmospheric valve

Publications (2)

Publication Number Publication Date
CN103939623A CN103939623A (en) 2014-07-23
CN103939623B true CN103939623B (en) 2016-05-18

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104595508A (en) * 2015-01-23 2015-05-06 吴振庭 Valve sealing device
CN105715838B (en) * 2016-05-10 2018-06-22 无锡斯沃特流体控制技术有限公司 Elongate rod relief valve
CN107893859A (en) * 2017-11-08 2018-04-10 江苏国泉泵业制造有限公司 A kind of pilot formula sleeve adjusting valve
CN107906235A (en) * 2017-11-16 2018-04-13 杭州华惠阀门有限公司 A kind of steam security valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0972430A (en) * 1995-09-04 1997-03-18 Mitsubishi Heavy Ind Ltd Main steam control valve
CN202040387U (en) * 2011-04-15 2011-11-16 南京汇高阀业有限公司 Ultra-high pressure small-flow adjusting valve
CN202032098U (en) * 2011-05-16 2011-11-09 浙江德卡控制阀仪表有限公司 Pilot type cage regulation valve
CN202510790U (en) * 2012-03-31 2012-10-31 浙江三方控制阀股份有限公司 Pilot-operated cage type single seat regulating valve
CN103244748B (en) * 2013-05-09 2015-10-21 哈尔滨松林电站设备有限公司 Anti-cavitation drain regulating valve
CN203809703U (en) * 2014-05-05 2014-09-03 无锡卓尔阀业有限公司 Ultrahigh-pressure steam release valve

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