CN104879512A - Novel pressure meter needle valve - Google Patents

Novel pressure meter needle valve Download PDF

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Publication number
CN104879512A
CN104879512A CN 201510289021 CN201510289021A CN104879512A CN 104879512 A CN104879512 A CN 104879512A CN 201510289021 CN201510289021 CN 201510289021 CN 201510289021 A CN201510289021 A CN 201510289021A CN 104879512 A CN104879512 A CN 104879512A
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CN
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Patent type
Prior art keywords
valve
valve body
lower
bottom
pressure meter
Prior art date
Application number
CN 201510289021
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Chinese (zh)
Inventor
许炎章
Original Assignee
许炎章
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    • 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
    • F16K1/38Valve members of conical shape
    • 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
    • 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
    • F16K1/48Attaching valve members to screw-spindles
    • 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
    • F16K27/00Construction of housing; Use of materials therefor
    • F16K27/02Construction of housing; Use of materials therefor of lift valves
    • 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
    • F16K27/00Construction of housing; Use of materials therefor
    • F16K27/12Covers for housings
    • 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
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/44Mechanical actuating means
    • F16K31/60Handles
    • 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
    • F16K37/00Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given

Abstract

The invention relates to the technical field of valves, in particular to a novel pressure meter needle valve. The novel pressure meter needle valve comprises a lower valve body, wherein an air inlet, an air outlet and a control hole are formed in the lower valve body; the air inlet is communicated with the bottom of the control hole; a valve rod is arranged in the control hole; the upper part of the valve rod penetrates out of the lower valve body; a valve seat cooperates with the bottom of the valve rod to block the control hole is arranged in the control hole; the air outlet is communicated with the control hole in the upper part of the valve seat; an upper valve body is connected to the upward side of the lower valve body; a driving device used for driving the valve rod to move up and down is arranged in the upper valve body; the bottom of the valve rod is connected with a conical valve element; a vent valve is arranged at the bottom of the lower valve body; a pressure meter is mounted at the air outlet. The novel pressure meter needle valve is reasonable in design, easy to operate and high in safety performance; when a pipeline system needs to be depressurized or the pressure meter needs to be maintained and replaced, the vent valve is turned on, so that high-pressure air in the valve body and the pressure meter can be emptied, and the service life can be prolonged.

Description

一种新型压力表针型阀 A New Pressure Gauge Valve

技术领域 FIELD

[0001] 本发明涉及阀门技术领域,尤其是一种新型压力表针型阀。 [0001] The present invention relates to a valve technical field, in particular, is a new Pressure Gauge Valve.

背景技术 Background technique

[0002] 压力表截止阀广泛运用于化工,石油,冶金,矿山,电力,能源,环保等工业生产过程中,用来做连接压力表,测量和管理压力,并根据需要,对输送介质的管路排放污垢,或适时取样进行成分分析,现行技术中的压力表截止阀只能用于安装压力仪表,由于无法及时对管路排污,泄压,尤其是当阀门处于关闭状态时,无法排空阀体内和压力表中的介质压力,给生产带来不安全性,特别是阀体和压力表内长期处于高压状态,极大的影响压力表和阀门的精确度,密封性和使用寿命及安全性能,并且,在实际使用中,操作人员在维修,检查或更换压力表时,由于压力表内处于高压状态,表内的介质压力不能做到及时泄压,增加了操作人员的危险性。 [0002] gauge cut valve widely used in chemical, petroleum, metallurgical, mining, power, energy, environmental protection and other industrial processes, used for connecting a pressure gauge, pressure measurement and management, and, if necessary, of the pipe conveying the medium discharging the dirt road, or timely sampled for composition analysis, pressure gauge stop valve only existing techniques for mounting the pressure gauge, inability to timely discharge line, pressure relief, especially when the valve is in the closed state, can not be evacuated the valve body and the pressure gauge in the medium, to the production of insecurity, particularly long-term at high pressure within the valve body and a pressure gauge, a great impact on the accuracy of the pressure gauge and the valve, and tightness and life safety performance, and, in actual use, the operator at the time of maintenance, inspection or replacement of the pressure gauge, the pressure gauge since a high pressure condition, the pressure medium in the table can not timely relief, increasing the risk of the operator.

发明内容 SUMMARY

[0003] 本发明要解决的技术问题是:克服现有技术中之不足,提供一种结构简单,能排空管路的新型压力表针型阀。 [0003] The present invention is to solve the technical problem: to overcome the deficiencies of the prior art, providing a simple structure, a new line can be evacuated Pressure Gauge Valve.

[0004] 本发明解决其技术问题所采用的技术方案是:一种新型压力表针型阀,包括下阀体,下阀体上设有水平的进气口、水平的出气口以及竖直的控制孔;所述进气口通过第一通道与控制孔底部相通,控制孔内设有上部穿出下阀体的阀杆,控制孔内设有与阀杆底部配合将控制孔阻断的阀座,出气口与阀座上部的控制孔通过第二通孔相通;所述下阀体上方连接有上阀体,上阀体内置有驱动阀杆上下的驱动装置,阀杆底部连接有圆锥形的阀芯,上阀体顶端设有将上阀体封闭的阀盖;所述下阀体底部设有排气阀,出气口安装有压力表。 [0004] aspect of the present invention to solve the technical problem are: Pressure Gauge a new valve, under the control of a valve body comprising, on the lower valve body provided with a horizontal air inlet, the outlet and the vertical level of aperture; through the gas inlet passage in communication with the bottom of the first control bore, controls the lower valve body piercing hole provided with an upper valve stem is provided with a control hole and the bottom hole of the control valve stem with a valve seat to block , an upper outlet and a control valve seat hole communicating through the second through-hole; lower above the valve body is connected to the valve body, the valve body drive means has a drive stem built up and down, the bottom has a conical stem connection the valve body, the valve body is provided on the top of the valve body closing a valve cap; bottom of the lower valve body is provided with an exhaust valve, a pressure gauge is attached to the air outlet.

[0005] 进一步地,所述的驱动装置包括内置于上阀体的调节杆,调节杆与阀杆固定连接,调节杆外壁车有螺纹,调节杆与阀盖内壁螺纹连接,所述阀盖内设有对上阀体密封的密封组件,密封组件套设在调节杆上。 [0005] Furthermore, the drive means comprises a valve incorporated in the adjusting lever, the adjusting lever is fixedly connected with the valve stem, the outer wall is threaded adjusting rod, the adjusting rod and the inner wall threaded bonnet, the bonnet the seal is provided on the valve body seal assembly, the seal assembly disposed in the sleeve adjustment rod.

[0006] 进一步地,所述的调节杆穿过阀盖后连接有手轮。 [0006] Further, the adjusting lever through a hand wheel connected to the bonnet.

[0007] 进一步地,所述的第一通道和第二通孔均为倾斜结构,第一通道中心轴线与水平面的倾斜角度为10° -20°,第二通孔中心轴线与水平面的倾斜角度为15° -25°。 [0007] Further, the first channel and the second through-holes are inclined structure, the inclination angle of the center axis of the first passage and the horizontal plane is 10 ° -20 °, the inclination angle of the center axis of the second through hole and the horizontal of 15 ° -25 °.

[0008] 进一步地,所述的压力表通过压力表螺母连接在下阀体的出气口。 [0008] Further, the pressure gauge coupled to the lower valve outlet port by a pressure gauge nut.

[0009] 本发明的有益效果是:本发明设计合理,在下阀体底部设有排气阀,操作简便,安全性能高,当管路系统需要泄压或检修、更换压力表时,打开排气阀即可放空阀体和压力表中的高压气体,同时,不影响阀门的工作性能,能延长使用寿命。 [0009] Advantageous effects of the present invention is that: the rational design of the present invention, the lower bottom of the body is provided with an exhaust valve, easy operation, high safety performance, when the pressure relief piping system requires repair or replacement of the pressure gauge, exhaust open vent valve body and pressure gauge to the high pressure gas, while the valve does not affect performance, and can extend the service life.

附图说明 BRIEF DESCRIPTION

[0010] 下面结合附图和实施例对本发明进一步说明。 Figures and examples further illustrate the present invention [0010] The following binding.

[0011] 图1是本发明的结构示意图。 [0011] FIG. 1 is a structural diagram of the present invention.

[0012] 图中1.上阀体,2.下阀体,3.阀盖,4.进气口,5.第一通道,6.控制孔,7.阀芯,8.出气口,9.第二通孔,10.阀杆,11.手轮,12.调节杆,13.密封组件,14.阀座,15.排气阀,16.压力表螺母,17.压力表。 [0012] FIG 1. valve body 2. Lower valve body, 3 the valve cover, 4 the intake port 5. The first channel 6. The control hole 7. Spool 8. outlet, 9 The second through hole 10 valve stem 11. handwheel 12. adjusting lever 13. seal assembly 14 valve seat 15 exhaust valve, 16 pressure gauge nut 17 gauge.

具体实施方式 Detailed ways

[0013] 现在结合附图和优选实施例对本发明作进一步的说明。 [0013] Now conjunction with the drawings and preferred embodiments of the present invention will be further described. 这些附图均为简化的示意图,仅以示意方式说明本发明的基本结构,因此其仅显示与本发明有关的构成。 The drawings are simplified schematic way of illustration only schematically the basic structure of the present invention, therefore only the configuration of the display related to the present invention.

[0014] 如图1所示的一种新型压力表针型阀,包括下阀体2,下阀体2上设有水平的进气口4、水平的出气口8以及竖直的控制孔6 ;进气口4通过第一通道5与控制孔6底部相通,控制孔6内设有上部穿出下阀体2的阀杆10,控制孔6内设有与阀杆10底部配合将控制孔6阻断的阀座14,出气口8与阀座14上部的控制孔6通过第二通孔9相通;所述下阀体2上方连接有上阀体1,上阀体I内置有驱动阀杆10上下的驱动装置,阀杆10底部连接有圆锥形的阀芯7,上阀体I顶端设有将上阀体I封闭的阀盖3 ;下阀体2底部设有排气阀15,出气口8安装有压力表17。 Level provided on the intake port 4, to control the level of outlet apertures 8 and vertical [0014] FIG Manmeter a new valve shown 1, 2 comprises a lower valve body, the valve element 26; intake port 4 communicates through the bottom of the first channel 6 and a control orifice 5, 6 are equipped with control holes piercing the upper portion of the stem 10 of the valve body 2, features a control orifice 6 of the control valve stem bore 10 mating with the bottom 6 blocking valve seat 14, outlet bore 14 8 and the upper portion of the control valve 6 communicates through the second through hole 9; above the lower valve body 2 is connected to the valve body 1, the valve stem drive built I the vertical driving device 10, the stem 10 is connected to the bottom of the conical valve body 7, the top body I I is provided on the valve body closing the valve cover 3; the bottom of the lower valve body 2 is provided with an exhaust valve 15, the intake port 8 is attached a pressure gauge 17.

[0015] 驱动装置包括内置于上阀体I的调节杆12,调节杆12与阀杆10固定连接,调节杆12外壁车有螺纹,调节杆12与阀盖3内壁螺纹连接,阀盖3内设有对上阀体I密封的密封组件13,密封组件13套设在调节杆12上;调节杆12穿过阀盖3后连接有手轮11 ;第一通道5和第二通孔9均为倾斜结构,第一通道5中心轴线与水平面的倾斜角度为10°,第二通孔9中心轴线与水平面的倾斜角度为15° ;压力表17通过压力表螺母16连接在下阀体2的出气口8。 [0015] The drive means comprises a valve incorporated in the adjusting lever 12 is I, the adjustment lever 12 and the stem 10 is fixedly connected to the outer wall of the adjusting rod 12 is threaded, the adjusting lever 12 connected to a threaded inner wall of the valve cover 3, and the valve cover 3 I seal provided on the valve body 13 of the seal assembly, the seal assembly 13 sleeved on the adjustment lever 12; adjusting lever 3 is connected to the cover 12 through the valve handwheel 11; a first passage 5 and second through holes 9 are an inclined structure, the inclination angle of the center axis of the first passage 5 and the horizontal plane is 10 °, the inclination angle of the center of the second through hole 9 and the horizontal axis is 15 °; gauge pressure gauge 17 by a nut 16 connected to the lower valve 2 port 8.

[0016] 操作人员旋转手轮11,驱动调节杆12向下移动,从而带动阀杆10下移,阀芯7与阀座14接触阻断控制孔6,截止阀关闭。 [0016] The operator rotating the handle 11, the driving adjusting lever 12 is moved downwardly, so as to drive the valve stem 10 down, the valve body 7 in contact with the valve seat 14 to block the control orifice 6, cut-off valve is closed. 此时打开排气阀15,压力表17和下阀体2内的高压气体得到泄压排空,以便于更换、维修压力表17。 Opens the exhaust valve 15, pressure gauge 17 and the lower valve body 2 obtained in the high-pressure gas relief emptied, in order to facilitate replacement, repair pressure gauge 17.

[0017] 这种新型压力表针型阀结构简单,设计合理,在下阀体2底部设有排气阀15,操作简便,安全性能高,当管路系统需要泄压或检修、更换压力表17时,打开排气阀15即可放空下阀体2和压力表17中的高压气体,同时,不影响阀门的工作性能,能延长使用寿命。 [0017] This new pressure Gauge Valve simple structure, reasonable design, the bottom of the lower valve body 2 is provided with an exhaust valve 15, easy operation, high safety performance, when needed relief piping system 17 or repair, replace gauge , opening the exhaust valve 15 to vent the pressure gauge in the valve body 2 and the high-pressure gas 17, while the valve does not affect performance, and can extend the service life.

[0018] 上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施,并不能以此限制本发明的保护范围,凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围内。 [0018] Examples of the above-described embodiments illustrate the technical concept and features of the invention, its object is to only allow those familiar with the art to understand the present invention and implement them, and thus does not limit the scope of the present invention, where an equivalent variations or modifications made from the spirit of the present invention, shall fall within the protection scope of the present invention.

Claims (5)

1.一种新型压力表针型阀,其特征在于:包括下阀体(2),下阀体(2)上设有水平的进气口(4)、水平的出气口(8)以及竖直的控制孔(6);所述进气口(4)通过第一通道(5)与控制孔(6)底部相通,控制孔(6)内设有上部穿出下阀体(2)的阀杆(10),控制孔(6)内设有与阀杆(10)底部配合将控制孔(6)阻断的阀座(14),出气口(8)与阀座(14)上部的控制孔(6)通过第二通孔(9)相通;所述下阀体(2)上方连接有上阀体(1),上阀体⑴内置有驱动阀杆(10)上下的驱动装置,阀杆(10)底部连接有圆锥形的阀芯(7),上阀体(I)顶端设有将上阀体(I)封闭的阀盖(3);所述下阀体(2)底部设有排气阀(15),出气口(8)安装有压力表(17)。 1. A novel Manmeter valve comprising: a lower valve body (2), the level of the lower valve body is provided with an intake port (4), the horizontal air outlet (2) (8) and the vertical a control orifice (6); said air inlet (4) through the bottom of the first communication passage (5) and the control port (6), a control orifice (6) is provided with an upper piercing the lower valve body (2) of the valve rod (10), a control orifice (6) is provided with a bottom with a valve stem (10) with a valve seat (14) of the control orifice (6) of the block, the upper portion of the control (8) with the valve seat (14) outlet holes (6) (9) communicating through a second through hole; a lower valve body (2) is connected to the top of the valve body (1), the upper and lower drive means (10) built on the valve body ⑴ drive stem, a bottom rod (10) connected to a conical valve body (7), the valve body (I) will be provided on top of the valve body (I) a valve closure cap (3); said lower valve body (2) located at the bottom an exhaust valve (15), outlet (8) is attached to a pressure gauge (17).
2.根据权利要求1所述的新型压力表针型阀,其特征在于:所述的驱动装置包括内置于上阀体(I)的调节杆(12),调节杆(12)与阀杆(10)固定连接,调节杆(12)外壁车有螺纹,调节杆(12)与阀盖(3)内壁螺纹连接,所述阀盖(3)内设有对上阀体⑴密封的密封组件(13),密封组件(13)套设在调节杆(12)上。 The new Pressure Gauge Valve according to claim 1, wherein: said driving means includes a built on the valve body (I) of the adjusting lever (12), the adjusting lever (12) and stem (10 ) is fixedly connected to the adjusting lever (12) of the outer wall is threaded, the adjusting lever (12) and the valve cover (3) inner wall of the threaded connection, the valve cover (3) is provided with a sealing assembly (13 of the upper valve seal ⑴ ), the seal assembly (13) is sleeved on the adjustment lever (12).
3.根据权利要求1所述的新型压力表针型阀,其特征在于:所述的调节杆(12)穿过阀盖(3)后连接有手轮(11)。 According to claim Manmeter novel valve of claim 1, wherein: said adjustment lever (12) is connected through a hand wheel (11) after the valve cover (3).
4.根据权利要求1所述的新型压力表针型阀,其特征在于:所述的第一通道(5)和第二通孔(9)均为倾斜结构,第一通道(5)中心轴线与水平面的倾斜角度为10° -20°,第二通孔(9)中心轴线与水平面的倾斜角度为15° -25。 The new Pressure Gauge Valve according to claim 1, wherein: the central axis of the first channel (5) and second through holes (9) are inclined structure, the first channel (5) and the inclination angle of the horizontal plane is 10 ° -20 °, (9) an inclination angle with the horizontal center axis of the second through-hole 15 ° -25. .
5.根据权利要求1所述的新型压力表针型阀,其特征在于:所述的压力表(17)通过压力表螺母(16)连接在下阀体⑵的出气口(8)。 According to claim Manmeter novel valve of claim 1, wherein: said gauge (17) coupled to the lower valve outlet port by a pressure gauge ⑵ nut (16) (8).
CN 201510289021 2015-05-29 2015-05-29 Novel pressure meter needle valve CN104879512A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105042103A (en) * 2015-09-09 2015-11-11 上海隆麦机械设备工程有限公司 Gauge valve special for denitration module system
CN105806557A (en) * 2016-05-20 2016-07-27 北京斯贝克科技有限责任公司 Valve for on-line verification and calibration of pressure gauge

Citations (8)

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GB2092272A (en) * 1981-02-02 1982-08-11 Smith International High pressure valve
CN2859114Y (en) * 2005-12-01 2007-01-17 余安泽 Integrated type bonnet needle valve
CN2871993Y (en) * 2006-02-10 2007-02-21 北京康斯特仪表科技有限公司 Pressure cut-off valve with flow adjustment
CN101131218A (en) * 2007-10-09 2008-02-27 邢玉庆 Pressure instrument needle valve with fast checking joint
CN201259013Y (en) * 2008-08-22 2009-06-17 安徽省屯溪高压阀门有限公司;黄山永佳(集团)有限公司 Needle flap stop valve
CN204004457U (en) * 2014-07-22 2014-12-10 江苏经纬阀业有限公司 Improved needle valve
CN204114163U (en) * 2014-09-25 2015-01-21 江苏华太电力仪表有限公司 Novel needle type stop valve
CN204739226U (en) * 2015-05-29 2015-11-04 常州埃姆基冷冻设备有限公司 Novel pressure indicator type valve

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GB2092272A (en) * 1981-02-02 1982-08-11 Smith International High pressure valve
CN2859114Y (en) * 2005-12-01 2007-01-17 余安泽 Integrated type bonnet needle valve
CN2871993Y (en) * 2006-02-10 2007-02-21 北京康斯特仪表科技有限公司 Pressure cut-off valve with flow adjustment
CN101131218A (en) * 2007-10-09 2008-02-27 邢玉庆 Pressure instrument needle valve with fast checking joint
CN201259013Y (en) * 2008-08-22 2009-06-17 安徽省屯溪高压阀门有限公司;黄山永佳(集团)有限公司 Needle flap stop valve
CN204004457U (en) * 2014-07-22 2014-12-10 江苏经纬阀业有限公司 Improved needle valve
CN204114163U (en) * 2014-09-25 2015-01-21 江苏华太电力仪表有限公司 Novel needle type stop valve
CN204739226U (en) * 2015-05-29 2015-11-04 常州埃姆基冷冻设备有限公司 Novel pressure indicator type valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105042103A (en) * 2015-09-09 2015-11-11 上海隆麦机械设备工程有限公司 Gauge valve special for denitration module system
CN105806557A (en) * 2016-05-20 2016-07-27 北京斯贝克科技有限责任公司 Valve for on-line verification and calibration of pressure gauge

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