WO2012097539A1 - Superhigh pressure micro-torque leakage-free valve - Google Patents

Superhigh pressure micro-torque leakage-free valve Download PDF

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Publication number
WO2012097539A1
WO2012097539A1 PCT/CN2011/071956 CN2011071956W WO2012097539A1 WO 2012097539 A1 WO2012097539 A1 WO 2012097539A1 CN 2011071956 W CN2011071956 W CN 2011071956W WO 2012097539 A1 WO2012097539 A1 WO 2012097539A1
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WIPO (PCT)
Prior art keywords
valve
sleeve
limit nut
thread
stem
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PCT/CN2011/071956
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French (fr)
Chinese (zh)
Inventor
邱金全
Original Assignee
Qiu Jinquan
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Publication of WO2012097539A1 publication Critical patent/WO2012097539A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift 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
    • F16K1/24—Lift 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 with valve members that, on opening of the valve, are initially lifted from the seat and next are turned around an axis parallel to the seat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift 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
    • F16K1/16—Lift 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 with pivoted closure-members
    • F16K1/18—Lift 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 with pivoted closure-members with pivoted discs or flaps
    • F16K1/20—Lift 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 with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
    • F16K1/2007—Lift 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 with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member specially adapted operating means therefor

Definitions

  • the present invention relates to a valve, and more particularly to an ultra high pressure micro torque leak free valve.
  • the invention is to solve the problems of the existing valve, which is laborious to open and prone to leakage.
  • the technical solution adopted by the present invention comprises: a valve body, a valve stem, a valve plate and a handle, a fluid storage chamber is disposed in the valve body, a slider is arranged in the fluid storage chamber, and the valve plate and the slider pass through the connecting member.
  • a rotation limit nut is arranged between the valve body and the valve plate, the rotation limit nut is connected with the valve plate, the valve stem passes through the rotation limit nut and the valve plate, and the oil passage is arranged in the lower part of the valve body, and the oil passage is provided therein.
  • the check valve has a valve stem thread on the valve stem, and the rotation limit nut is provided with an internal thread, and the valve stem thread is screwed on the internal thread of the rotation limit nut; when the valve is opened, the valve stem thread is screwed into the rotation limit nut. Thread upper limit; when the valve is closed, the stem thread is screwed to the lower limit of the internal thread of the rotation limit nut, and the upper part of the internal thread of the limit nut is left with a gap.
  • the beneficial effects of the invention are: opening labor saving and good sealing performance.
  • FIG. 1 is a schematic view showing the structure of the present invention in a closed state.
  • Figure 2 is a schematic view showing the structure of the present invention in an open state.
  • Figure 3 is a schematic view showing the structure of another position in the open state of the present invention.
  • valve plate 4 is a schematic structural view of a valve plate.
  • Figure 5 is a right side view of Figure 4.
  • Figure 6 is a left side view of Figure 4.
  • Figure 7 is a top plan view of Figure 4.
  • Fig. 8 is a schematic structural view of a slider.
  • Figure 9 is a right side view of Figure 8.
  • Figure 10 is a schematic view showing the structure of the lower bushing.
  • Figure 11 is a top plan view of Figure 10.
  • Figure 12 is a schematic view showing the structure of a rotating rotary nut.
  • Figure 13 is a bottom plan view of Figure 12 .
  • Figure 14 is a cross-sectional view taken along line A-A of Figure 13;
  • the present invention includes a valve body 1, a valve stem 3, a valve plate 2, and a handle 13.
  • a fluid storage chamber 9 is disposed in the valve body 1, and an annular slider 8 is disposed in the fluid storage chamber 9.
  • the valve plate 2 and the annular slider 8 are connected by a connecting member.
  • a rotation limit nut 14 is disposed between the valve body 1 and the valve plate 2, and the rotation limit nut 14 is connected to the valve plate 2.
  • the valve stem 3 passes through the rotation limit nut 14 and the valve plate 2.
  • An oil passage 7 is disposed at a lower portion of the valve body 1, and a check valve is disposed in the oil passage 7.
  • the valve stem 3 is provided with a valve stem thread 15, and the rotation limiting nut 14 is provided with an internal thread 19.
  • the stem thread 15 is screwed onto the internal thread 19 of the rotation limit nut 14.
  • the stem thread 15 is screwed to the upper limit of the internal thread 19 of the rotation limit nut 14, and the gap 1-2 is left at the lower end of the valve stem 3 to open the check valve.
  • the stem thread 15 is screwed to the lower limit of the internal thread 19 of the rotation limit nut 14, and the gap 1-1 is left in the upper portion of the internal thread 19 of the limit nut 14.
  • the one-way valve is composed of a valve stem 3, a steel ball 6 and an oil passage 7.
  • the lower end of the valve stem 3 is placed on the steel ball 6, and the steel ball 6 is located in the oil passage 7.
  • the upper end of the valve plate 2 is provided with an upper rotating head 17 and a lower rotating head 18.
  • the connecting member includes an upper bushing 10, an upper bushing seat 11, a lower bushing 5, and a lower bushing seat 4.
  • the upper sleeve 10 and the lower sleeve 18 are respectively mounted with an upper sleeve 10 and a lower sleeve 5, and the upper sleeve 10 and the lower sleeve 5 are respectively mounted in the upper sleeve housing 11 and the lower sleeve housing 4.
  • the upper sleeve sleeve 11 and the lower sleeve sleeve 4 have the same structure, and the upper sleeve sleeve 11 and the lower sleeve sleeve 4 are respectively disposed on the upper side and the lower side of the valve body 1.
  • the valve body 1 is provided with a limit nut bushing 12, and the rotation limit nut 14 is disposed in the limit nut bushing 12.
  • a sliding groove 16 is disposed in the upper rotating head 17 of the valve plate 2.
  • the lower end of the rotating limiting nut 14 is provided with a chuck 20, and the rotating limiting nut 14 is inserted into the sliding slot 16 through the clamping head 20.
  • the rotation limit nut 14 is relatively slidable in the sliding groove 16 of the valve plate 2.
  • the valve opening manner of the present invention is: the operator rotates the handle 13, the valve stem 3 connected to the handle 13 rotates with the handle 13, and while the valve stem 3 is rotating, the valve stem thread 15 at the upper portion of the valve stem 3 is also rotated.
  • the internal thread 19 of the bit nut 14 rotates, causing the valve stem 3 to move axially and rise.
  • the bottom check valve is then opened (ie, the steel ball 6 no longer blocks the oil passage 7), and the fluid storage chamber 9 is released.
  • a pressure difference is generated on both sides of the fluid storage chamber 9, so that the annular slider 8 drives the valve plate 2 to move toward the fluid storage chamber 9 side, thereby causing the valve plate 2 and the valve body 1 to be sealed.
  • valve stem thread 15 is also rotated to the upper limit of the internal thread 19 of the rotation limit nut 14, and then the handle 13 is rotated, so that the rotation limit nut 14 rotates together, and the valve plate 2 is driven to rotate until the valve is fully opened.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Taps Or Cocks (AREA)

Abstract

A superhigh pressure micro-torque leakage-free valve includes a valve body (1), a valve stem (3), a valve plate (2) and a handle (13). A fluid storage chamber (9) is provided within the valve body and a slide (8) provided within the fluid storage chamber is connected to the valve body by a connector. An oil channel (7) is provided on the lower part of the valve body, and a check valve is provided in the oil channel. A rotary limiting nut (14) is provided between the valve body and the valve plate, and is connected to the valve plate. The valve stem passes through the rotary limiting nut and the valve plate, and is provided with a valve stem thread (15) which is screwed on an inner thread (19) of the rotary limiting nut. The valve stem thread is screwed to the upper limit of the inner thread of the rotary limiting nut in an opening state of the valve and the valve stem thread is screwed to the lower limit of the rotary limiting nut in a closing state of the valve. A gap (1-1) is formed above the inner thread of the rotary limiting nut. The valve saves labor when opening and has high tightness.

Description

超高压微扭矩无泄漏阀门 Ultra high pressure micro torque leak free valve 技术领域Technical field
本发明涉及一种阀门，具体地说是一种超高压微扭矩无泄漏阀门。  The present invention relates to a valve, and more particularly to an ultra high pressure micro torque leak free valve.
背景技术Background technique
现有的用于管道的阀门，特别是用于高压管道阀门，由于扭矩的存在，开启费力，而且这种阀门也容易出现泄漏，达不到要求的密封标准。 Existing valves for pipes, especially for high-pressure pipe valves, are laborious to open due to the presence of torque, and such valves are prone to leakage and fail to meet the required sealing standards.
技术问题technical problem
本发明要解决的是现有的阀门，开启费力和容易出现泄漏的问题。  The invention is to solve the problems of the existing valve, which is laborious to open and prone to leakage.
技术解决方案Technical solution
为实现上述目的，本发明采用的技术方案是：它包括阀体、阀杆、阀板和手柄，阀体内设有流体储藏室、流体储藏室内设有滑块，阀板与滑块通过连接件连接，阀体与阀板之间设有转动限位螺母，转动限位螺母与阀板连接，阀杆穿过转动限位螺母和阀板，阀体下部设有油道，油道内设有单向阀，阀杆上设有阀杆螺纹，转动限位螺母设有内螺纹，阀杆螺纹旋于转动限位螺母内螺纹上；阀门开启状态下，阀杆螺纹旋至转动限位螺母内螺纹上限；阀门关闭状态下，阀杆螺纹旋至转动限位螺母内螺纹下限，限位螺母内螺纹上部留有空隙。In order to achieve the above object, the technical solution adopted by the present invention comprises: a valve body, a valve stem, a valve plate and a handle, a fluid storage chamber is disposed in the valve body, a slider is arranged in the fluid storage chamber, and the valve plate and the slider pass through the connecting member. Connection, a rotation limit nut is arranged between the valve body and the valve plate, the rotation limit nut is connected with the valve plate, the valve stem passes through the rotation limit nut and the valve plate, and the oil passage is arranged in the lower part of the valve body, and the oil passage is provided therein. The check valve has a valve stem thread on the valve stem, and the rotation limit nut is provided with an internal thread, and the valve stem thread is screwed on the internal thread of the rotation limit nut; when the valve is opened, the valve stem thread is screwed into the rotation limit nut. Thread upper limit; when the valve is closed, the stem thread is screwed to the lower limit of the internal thread of the rotation limit nut, and the upper part of the internal thread of the limit nut is left with a gap.
有益效果Beneficial effect
本发明的有益效果是：开启省力，密封性好。  The beneficial effects of the invention are: opening labor saving and good sealing performance.
附图说明DRAWINGS
图1是本发明关闭状态下的结构示意图。 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of the present invention in a closed state.
图2是本发明开启状态下的结构示意图。 Figure 2 is a schematic view showing the structure of the present invention in an open state.
图3是本发明开启状态下另一位置的结构示意图。 Figure 3 is a schematic view showing the structure of another position in the open state of the present invention.
图4是阀板的结构示意图。 4 is a schematic structural view of a valve plate.
图5是图4的右视示意图。 Figure 5 is a right side view of Figure 4.
图6是图4的左视示意图。 Figure 6 is a left side view of Figure 4.
图7是图4的俯视示意图。 Figure 7 is a top plan view of Figure 4.
图8是滑块的结构示意图。 Fig. 8 is a schematic structural view of a slider.
图9是图8的右视示意图。 Figure 9 is a right side view of Figure 8.
图10是下轴套的结构示意图。 Figure 10 is a schematic view showing the structure of the lower bushing.
图11是图10的俯视示意图。 Figure 11 is a top plan view of Figure 10.
图12是转动旋转螺母的结构示意图。 Figure 12 is a schematic view showing the structure of a rotating rotary nut.
图13是图12的仰视示意图。 Figure 13 is a bottom plan view of Figure 12 .
图14是图13的A-A剖面示意图。 Figure 14 is a cross-sectional view taken along line A-A of Figure 13;
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
本发明的实施方式Embodiments of the invention
下面结合附图及实施例对本发明作进一步说明。 The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
如图所示，本发明包括阀体1、阀杆3、阀板2和手柄13。阀体1内设有流体储藏室9、流体储藏室9内设有环状滑块8。阀板2与环状滑块8通过连接件连接。阀体1与阀板2之间设有转动限位螺母14，转动限位螺母14与阀板2连接。阀杆3穿过转动限位螺母14和阀板2。阀体1下部设有油道7，油道7内设有单向阀。阀杆3上设有阀杆螺纹15，转动限位螺母14设有内螺纹19。阀杆螺纹15旋于转动限位螺母14内螺纹19上。阀门开启状态下，阀杆螺纹15旋至转动限位螺母14内螺纹19上限，阀杆3下端留有空隙1-2，使单向阀开通。阀门关闭状态下，阀杆螺纹15旋至转动限位螺母14内螺纹19下限，限位螺母14内螺纹19上部留有空隙1-1。 As shown, the present invention includes a valve body 1, a valve stem 3, a valve plate 2, and a handle 13. A fluid storage chamber 9 is disposed in the valve body 1, and an annular slider 8 is disposed in the fluid storage chamber 9. The valve plate 2 and the annular slider 8 are connected by a connecting member. A rotation limit nut 14 is disposed between the valve body 1 and the valve plate 2, and the rotation limit nut 14 is connected to the valve plate 2. The valve stem 3 passes through the rotation limit nut 14 and the valve plate 2. An oil passage 7 is disposed at a lower portion of the valve body 1, and a check valve is disposed in the oil passage 7. The valve stem 3 is provided with a valve stem thread 15, and the rotation limiting nut 14 is provided with an internal thread 19. The stem thread 15 is screwed onto the internal thread 19 of the rotation limit nut 14. When the valve is open, the stem thread 15 is screwed to the upper limit of the internal thread 19 of the rotation limit nut 14, and the gap 1-2 is left at the lower end of the valve stem 3 to open the check valve. When the valve is closed, the stem thread 15 is screwed to the lower limit of the internal thread 19 of the rotation limit nut 14, and the gap 1-1 is left in the upper portion of the internal thread 19 of the limit nut 14.
所述的单向阀由阀杆3、钢球6和油道7构成。阀杆3下端顶于钢球6上，钢球6位于油道7内。所述的阀板2二端设有上转头17和下转头18。连接件包括上轴套10、上轴套座11、下轴套5和下轴套座4。上转头17和下转头18上分别安装有上轴套10和下轴套5，上轴套10和下轴套5分别安装于上轴套座11和下轴套座4内。上轴套座11和下轴套座4结构相同，上轴套座11和下轴套座4分别设于阀体1上侧和下侧。 The one-way valve is composed of a valve stem 3, a steel ball 6 and an oil passage 7. The lower end of the valve stem 3 is placed on the steel ball 6, and the steel ball 6 is located in the oil passage 7. The upper end of the valve plate 2 is provided with an upper rotating head 17 and a lower rotating head 18. The connecting member includes an upper bushing 10, an upper bushing seat 11, a lower bushing 5, and a lower bushing seat 4. The upper sleeve 10 and the lower sleeve 18 are respectively mounted with an upper sleeve 10 and a lower sleeve 5, and the upper sleeve 10 and the lower sleeve 5 are respectively mounted in the upper sleeve housing 11 and the lower sleeve housing 4. The upper sleeve sleeve 11 and the lower sleeve sleeve 4 have the same structure, and the upper sleeve sleeve 11 and the lower sleeve sleeve 4 are respectively disposed on the upper side and the lower side of the valve body 1.
阀体1内设有限位螺母轴套12，转动限位螺母14设于限位螺母轴套12内。所述的阀板2上转头17内设有滑槽16，转动限位螺母14下部设有卡头20，转动限位螺母14通过卡头20卡于滑槽16内。转动限位螺母14在阀板2的滑槽16内可作相对滑动。 The valve body 1 is provided with a limit nut bushing 12, and the rotation limit nut 14 is disposed in the limit nut bushing 12. A sliding groove 16 is disposed in the upper rotating head 17 of the valve plate 2. The lower end of the rotating limiting nut 14 is provided with a chuck 20, and the rotating limiting nut 14 is inserted into the sliding slot 16 through the clamping head 20. The rotation limit nut 14 is relatively slidable in the sliding groove 16 of the valve plate 2.
本发明的阀门开启方式是：操作人员转动手柄13，连接于该手柄13上的阀杆3随手柄13转动，阀杆3在转动的同时，阀杆3上部的阀杆螺纹15也在转动限位螺母14的内螺纹19中转动，使阀杆3轴向运动并上升。随之打开底部单向阀（即钢球6不再堵住油道7），使流体储藏室9泄压。流体储藏室9两侧产生压力差，从而使环形滑块8带动阀板2向流体储藏室9一侧移动，使阀板2与阀体1密封失效。这时阀杆螺纹15也旋至转动限位螺母14内螺纹19上限，再转动手柄13，使转动限位螺母14一同转动，就带动阀板2转动，直至阀门完全开启。 The valve opening manner of the present invention is: the operator rotates the handle 13, the valve stem 3 connected to the handle 13 rotates with the handle 13, and while the valve stem 3 is rotating, the valve stem thread 15 at the upper portion of the valve stem 3 is also rotated. The internal thread 19 of the bit nut 14 rotates, causing the valve stem 3 to move axially and rise. The bottom check valve is then opened (ie, the steel ball 6 no longer blocks the oil passage 7), and the fluid storage chamber 9 is released. A pressure difference is generated on both sides of the fluid storage chamber 9, so that the annular slider 8 drives the valve plate 2 to move toward the fluid storage chamber 9 side, thereby causing the valve plate 2 and the valve body 1 to be sealed. At this time, the valve stem thread 15 is also rotated to the upper limit of the internal thread 19 of the rotation limit nut 14, and then the handle 13 is rotated, so that the rotation limit nut 14 rotates together, and the valve plate 2 is driven to rotate until the valve is fully opened.
工业实用性Industrial applicability
序列表自由内容Sequence table free content

Claims (6)

  1. 一种超高压微扭矩无泄漏阀门，包括阀体、阀杆、阀板和手柄，其特征在 于阀体内设有流体储藏室、流体储藏室内设有滑块，阀板与滑块通过连接件连接，阀体与阀板之间设有转动限位螺母，转动限位螺母与阀板连接，阀杆穿过转动限位螺母和阀板，阀体下部设有油道，油道内设有单向阀，阀杆上设有阀杆螺纹，转动限位螺母设有内螺纹，阀杆螺纹旋于转动限位螺母内螺纹上；阀门开启状态下，阀杆螺纹旋至转动限位螺母内螺纹上限；阀门关闭状态下，阀杆螺纹旋至转动限位螺母内螺纹下限，限位螺母内螺纹上部留有空隙。 An ultra-high pressure micro-torque leak-free valve, comprising a valve body, a valve stem, a valve plate and a handle, wherein the valve body is provided with a fluid storage chamber, the fluid storage chamber is provided with a slider, and the valve plate and the slider are connected by a connecting member a rotating limit nut is arranged between the valve body and the valve plate, the rotation limit nut is connected with the valve plate, the valve stem passes through the rotation limit nut and the valve plate, the oil passage is arranged at the lower part of the valve body, and the oil passage is provided with a single To the valve, the valve stem is provided with a valve stem thread, the rotation limit nut is provided with an internal thread, and the valve stem thread is screwed on the internal thread of the rotation limit nut; when the valve is opened, the valve stem thread is screwed to the rotation limit nut internal thread Upper limit; when the valve is closed, the stem thread is screwed to the lower limit of the internal thread of the rotation limit nut, and the upper part of the internal thread of the limit nut is left with a gap.
  2. 根据权利要求1所述的超高压微扭矩无泄漏阀门，其特征在于所述的单向 阀由阀杆、钢球和油道构成，阀杆下端顶于钢球上，钢球位于油道内。 The ultrahigh pressure micro-torque leak-free valve of claim 1 wherein said one-way The valve is composed of a valve stem, a steel ball and an oil passage. The lower end of the valve stem is placed on the steel ball, and the steel ball is located in the oil passage.
  3. 根据权利要求1所述的超高压微扭矩无泄漏阀门，其特征在于所述的阀板 二端设有上转头和下转头，连接件包括上轴套、上轴套座、下轴套和下轴套座，上转头和下转头上上分别安装有上轴套和下轴套，上轴套和下轴套分别安装于上轴套座和下轴套座内，上轴套座和下轴套座分别设于阀体上侧和下侧。 The ultrahigh pressure micro torque leak free valve of claim 1 wherein said valve plate The second end is provided with an upper rotating head and a lower rotating head, and the connecting member comprises an upper sleeve, an upper sleeve sleeve, a lower sleeve and a lower sleeve sleeve, and the upper sleeve and the lower rotating head are respectively mounted with an upper sleeve and a lower sleeve The sleeve, the upper sleeve and the lower sleeve are respectively installed in the upper sleeve sleeve and the lower sleeve sleeve, and the upper sleeve sleeve and the lower sleeve sleeve are respectively disposed on the upper side and the lower side of the valve body.
  4. 根据权利要求1或3所述的超高压微扭矩无泄漏阀门，其特征在于所述的 阀板的上转头内设有滑槽，转动限位螺母下部设有卡头，转动限位螺母通过卡头卡于滑槽内。 The ultrahigh pressure micro-torque leak-free valve according to claim 1 or 3, characterized in that A sliding slot is arranged in the upper rotating head of the valve plate, and a lower end of the rotating limit nut is provided with a chuck, and the rotating limit nut is clamped into the sliding slot through the chuck.
  5. 根据权利要求1所述的超高压微扭矩无泄漏阀门，其特征在于滑块为环状 滑块。The ultrahigh pressure microtorque leak free valve of claim 1 wherein the slider is an annular slider.
  6. 根据权利要求1所述的超高压微扭矩无泄漏阀门，其特征在于阀体内设有限位螺母轴套，转动限位螺母设于限位螺母轴套内。The ultra-high pressure micro-torque leak-free valve according to claim 1, wherein the valve body is provided with a limit nut bushing, and the rotating limit nut is disposed in the limit nut bushing.
PCT/CN2011/071956 2011-01-23 2011-03-18 Superhigh pressure micro-torque leakage-free valve WO2012097539A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110027956.7 2011-01-23
CN 201110027956 CN102094986B (en) 2011-01-23 2011-01-23 High-voltage micro-torque leakage-free valve

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WO2012097539A1 true WO2012097539A1 (en) 2012-07-26

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EP2848843A1 (en) * 2013-09-17 2015-03-18 Alstom Technology Ltd Butterfly valve arrangement
EP3317566A4 (en) * 2015-06-30 2019-03-27 Scholle IPN Corporation Valve assembly

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JPS59187174A (en) * 1983-04-04 1984-10-24 Hamai Seisakusho:Kk Valve with service port
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EP2848843A1 (en) * 2013-09-17 2015-03-18 Alstom Technology Ltd Butterfly valve arrangement
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