WO2014032525A1 - Safety valve with low leakage and high sealing property - Google Patents

Safety valve with low leakage and high sealing property Download PDF

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Publication number
WO2014032525A1
WO2014032525A1 PCT/CN2013/081498 CN2013081498W WO2014032525A1 WO 2014032525 A1 WO2014032525 A1 WO 2014032525A1 CN 2013081498 W CN2013081498 W CN 2013081498W WO 2014032525 A1 WO2014032525 A1 WO 2014032525A1
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WIPO (PCT)
Prior art keywords
valve
valve core
joint
low leakage
safety valve
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Application number
PCT/CN2013/081498
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French (fr)
Chinese (zh)
Inventor
杜增虎
张小杰
王雯雯
张强利
Original Assignee
西安新思化工设备制造有限公司
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Publication of WO2014032525A1 publication Critical patent/WO2014032525A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A62C35/68—Details, e.g. of pipes or valve systems
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/162—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the non reverse-buckling-type
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A62C35/62—Pipe-line systems dry, i.e. empty of extinguishing material when not in use
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A62C35/64—Pipe-line systems pressurised
    • A62C35/645—Pipe-line systems pressurised with compressed gas in pipework

Definitions

  • the present invention relates to the field of fire protection, and in particular to a low venting and high sealing safety valve for use in a gas fire extinguishing system.
  • a low venting high sealing valve to prevent a slight leak of gas in the gas extinguishing system from accumulating in the pipeline and causing a false start
  • a safety valve to prevent the gas fire extinguishing system from being sprayed due to work
  • the low-leakage high-sealing valve and the safety valve are two separate components, which not only increases the number of components, but also reduces the efficiency of the pipe network assembly, and becomes one of the bottlenecks for reducing manufacturing costs and reducing the processing cycle.
  • the utility model combines the functions of the low leakage high sealing valve and the safety valve on one carrier, and provides a low leakage height with novel design, simple structure and reliable performance. Seal the safety valve.
  • the utility model relates to a low leakage high sealing safety valve, which comprises a joint 1, an elastic member 3, a valve core and a valve body 9.
  • the upper end of the valve body 9 is provided with an internal thread, and the joint 1 is screwed with the internal thread, and the valve core comprises
  • the first valve body 5 and the second valve body 8 are connected to each other, and the first valve body 5 and the second valve body 8 are centrally opened with a central through hole 10 penetrating therethrough.
  • a rupture diaphragm 7 is further disposed between the first spool 5 and the second spool 8 to block the through hole.
  • the rupture film 7 is provided with a pressure ring 6 for fixing the seal.
  • the elastic member 3 is a spring disposed between the joint 1 and the first spool 5. Further, a first gasket 2 is disposed between the joint 1 and the valve body 9; a second gasket 4 is disposed between the joint 1 and the first valve core 5.
  • the utility model is improved on the basis of the ordinary low leakage high sealing valve, and the valve core is divided into the first valve
  • the core and the second valve core are both parts, and a through hole is formed in the center of the valve core to increase the rupture diaphragm, thereby functioning to block the through hole.
  • the working principle of the device of the utility model is the same as that of the ordinary low-leakage high-sealing valve: when in the low-pressure relief state, the spool is equivalent to a piston nozzle, and the valve body outlet end joint is not sealed.
  • the inlet pressure of the valve body reaches a certain level, the thrust is generated to the spool, the spool is moved to the outlet end, and the gas end joint is squeezed to achieve the sealing function.
  • the utility model has the advantages of novel design, simple structure and reliable performance, and the functions of the gas low pressure high sealing valve and the safety relief valve are integrated, and the structure of the gas fire extinguishing system equipment is optimized, and the parts are reduced.
  • the quantity makes the pipe network assembly efficiency increase and the equipment cost decreases.
  • FIG. 1 is a schematic view of the structure of the present invention.
  • a low-leakage high-sealing safety valve as shown in FIG. 1 includes a joint 1, an elastic member 3, a valve core and a valve body 9.
  • the upper end of the valve body 9 is provided with an internal thread, and the joint 1 is screwed to the internal thread.
  • the elastic member 3 is a spring disposed between the joint 1 and the first valve body 5.
  • the valve core includes a first valve core 5 and a second valve core 8 connected to each other, and the first valve core 5 and the second valve core 8 are centrally opened with a central through hole 10 penetrating through the center; wherein the first valve core
  • the connection between the 5 and the second spool 8 may take various forms, such as: screwing, screwing, welding, etc., as long as the first spool 5 and the second spool 8 are integrally connected.
  • a rupture diaphragm 7 is also disposed between the first spool 5 and the second spool 8 to block the through hole.
  • the rupture disc 7 is provided with a pressure ring 6 for fixing the seal.
  • a first gasket 2 is disposed between the joint 1 and the valve body 9; a second gasket 4 is disposed between the joint 1 and the first valve core 5.
  • the device of the present invention has the following three working states:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Safety Valves (AREA)

Abstract

Disclosed is a safety valve with a low leakage and high sealing property, the safety valve comprising a connector (1), an elastic component (3), valve cores and a valve body (9), wherein the upper end of the valve body (9) is provided with an internal thread, the connector (1) is in a threaded connection with the internal thread, and the valve cores comprise a first valve core (5) and a second valve core (8) connected to each other. The safety valve is characterized in that central through holes (10), which are in communication with each other, are arranged at the centre of the first valve core (5) and of the second valve core (8); and a blasting diaphragm (7) and a press ring (6) are further arranged between the first valve core (5) and the second valve core (8).

Description

说 明 书 一种低泄高封安全阀  Description A low-bleed high-sealing safety valve
技术领域 本实用新型涉及消防领域， 具体涉及一种应用于气体灭火系统中的低 泄高封安全阀。 背景技术 为保证装置的安全性， 气体灭火系统均使用低泄高封阀 （防止气体灭 火系统微量漏气在管路中聚集而发生误启动） 与安全阀 （防止气体灭火系 统喷放时因工作压力太高而产生意外）。 目前低泄高封阀与安全阀是两个 独立部件， 这样不仅增加了部件数量， 还降低了管网装配效率， 成为降低 制造成本和减少加工周期的瓶颈之一。 实用新型内容 为了解决现有技术中存在的问题， 本实用新型将低泄高封阀与安全阀 二者功能融合在一个载体上， 提供了一种设计新颖、 结构简单、 性能可靠 的低泄高封安全阀。 TECHNICAL FIELD The present invention relates to the field of fire protection, and in particular to a low venting and high sealing safety valve for use in a gas fire extinguishing system. BACKGROUND OF THE INVENTION In order to ensure the safety of the device, the gas fire extinguishing system uses a low venting high sealing valve (to prevent a slight leak of gas in the gas extinguishing system from accumulating in the pipeline and causing a false start) and a safety valve (to prevent the gas fire extinguishing system from being sprayed due to work) The pressure is too high and an accident occurs). At present, the low-leakage high-sealing valve and the safety valve are two separate components, which not only increases the number of components, but also reduces the efficiency of the pipe network assembly, and becomes one of the bottlenecks for reducing manufacturing costs and reducing the processing cycle. SUMMARY OF THE INVENTION In order to solve the problems existing in the prior art, the utility model combines the functions of the low leakage high sealing valve and the safety valve on one carrier, and provides a low leakage height with novel design, simple structure and reliable performance. Seal the safety valve.
本实用新型解决技术问题的技术方案是：  The technical solution of the utility model to solve the technical problem is:
一种低泄高封安全阀， 包括接头 1、 弹性部件 3、 阀芯和阀体 9， 所述 阀体 9上端设有内螺紋， 接头 1与所述内螺紋螺接， 所述阀芯包括相互连 接的第一阀芯 5和第二阀芯 8， 所述第一阀芯 5和第二阀芯 8中心开有相 互贯通的中心通孔 10。  The utility model relates to a low leakage high sealing safety valve, which comprises a joint 1, an elastic member 3, a valve core and a valve body 9. The upper end of the valve body 9 is provided with an internal thread, and the joint 1 is screwed with the internal thread, and the valve core comprises The first valve body 5 and the second valve body 8 are connected to each other, and the first valve body 5 and the second valve body 8 are centrally opened with a central through hole 10 penetrating therethrough.
进一步地， 所述第一阀芯 5和第二阀芯 8间采用螺紋连接。  Further, a threaded connection is adopted between the first spool 5 and the second spool 8.
进一步地， 所述第一阀芯 5和第二阀芯 8之间还设有爆破膜片 7， 起 到隔断通孔的作用。  Further, a rupture diaphragm 7 is further disposed between the first spool 5 and the second spool 8 to block the through hole.
进一步地， 所述爆破膜片 7上设有用于固定密封的压环 6。  Further, the rupture film 7 is provided with a pressure ring 6 for fixing the seal.
进一步地，所述弹性部件 3为弹簧，设置于接头 1和第一阀芯 5之间。 进一步地， 所述接头 1与阀体 9之间设有第一垫圈 2; 所述接头 1与 第一阀芯 5之间设有第二垫圈 4。  Further, the elastic member 3 is a spring disposed between the joint 1 and the first spool 5. Further, a first gasket 2 is disposed between the joint 1 and the valve body 9; a second gasket 4 is disposed between the joint 1 and the first valve core 5.
本实用新型在普通低泄高封阀的基础上进行改进， 将阀芯分为第一阀 芯和第二阀芯两部分， 并在阀芯中心打通孔， 增加爆破膜片， 起到隔断通 孔的作用。 The utility model is improved on the basis of the ordinary low leakage high sealing valve, and the valve core is divided into the first valve The core and the second valve core are both parts, and a through hole is formed in the center of the valve core to increase the rupture diaphragm, thereby functioning to block the through hole.
当压力在安全工作范围内时， 本实用新型装置的工作原理和普通低泄 高封阀一样： 当处于低压泄放状态时， 阀芯相当于一个活塞接管， 和阀体 出气端接头并不密封； 当阀体进气压力达到一定程度， 对阀芯产生推力， 使阀芯向出气端运动， 并挤压出气端接头， 达到密封的作用。 而当压力超 出安全工作范围，产生不安全因素时， 阀芯中间的爆破膜片会被压力挤爆， 让阀芯中间的通孔贯通， 直接联通阀体进气端和出气端， 起到安全泄放压 力的作用。  When the pressure is within the safe working range, the working principle of the device of the utility model is the same as that of the ordinary low-leakage high-sealing valve: when in the low-pressure relief state, the spool is equivalent to a piston nozzle, and the valve body outlet end joint is not sealed. When the inlet pressure of the valve body reaches a certain level, the thrust is generated to the spool, the spool is moved to the outlet end, and the gas end joint is squeezed to achieve the sealing function. When the pressure exceeds the safe working range and unsafe factors occur, the rupture diaphragm in the middle of the valve core will be squeezed by the pressure, allowing the through hole in the middle of the valve core to penetrate, directly connecting the intake end and the outlet end of the valve body to ensure safety. The role of relief pressure.
本实用新型低泄高封安全阀设计新颖、 结构简单、 性能可靠， 集气体 的低泄高封阀及安全泄放阀二者功能为一体， 优化了气体灭火系统设备的 结构， 减少了零部件数量， 使管网装配效率提高， 设备成本降低。  The utility model has the advantages of novel design, simple structure and reliable performance, and the functions of the gas low pressure high sealing valve and the safety relief valve are integrated, and the structure of the gas fire extinguishing system equipment is optimized, and the parts are reduced. The quantity makes the pipe network assembly efficiency increase and the equipment cost decreases.
下面结合说明书附图对本实用新型做进一步的描述。 附图说明： 图 1为本实用新型的结构示意图。  The present invention will be further described below in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of the structure of the present invention.
图中： 1-接头， 2-第一垫圈， 3-弹性部件， 4-第二垫圈， 5-第一阀芯， 6-压环， 7-爆破膜片， 8-第二阀芯， 9-阀体 具体实施方式： 现结合附图对本实用新型的低泄高封安全阀进行进一步的说明。  In the figure: 1-joint, 2-first washer, 3-elastic part, 4-second washer, 5-first spool, 6-pressure ring, 7-blasting diaphragm, 8-second spool, 9 - Valve body embodiment: The low leakage high seal safety valve of the present invention will now be further described with reference to the accompanying drawings.
如图 1所示的一种低泄高封安全阀， 包括接头 1、 弹性部件 3、 阀芯 和阀体 9， 所述阀体 9上端设有内螺紋， 接头 1与所述内螺紋螺接， 所述 弹性部件 3为弹簧， 设置于接头 1和第一阀芯 5之间。 所述阀芯包括相互 连接的第一阀芯 5和第二阀芯 8， 第一阀芯 5和第二阀芯 8中心开有相互 贯通的中心通孔 10; 其中， 所述第一阀芯 5和第二阀芯 8的连接可以采用 多种形式， 例如： 螺紋连接、 螺钉连接、 焊接等， 只要将所述第一阀芯 5 和第二阀芯 8连接成一体即可。 所述第一阀芯 5和第二阀芯 8之间还设有 爆破膜片 7， 起到隔断通孔的作用。 所述爆破膜片 7上设有用于固定密封 的压环 6。 所述接头 1与阀体 9之间设有第一垫圈 2; 所述接头 1与第一 阀芯 5之间设有第二垫圈 4。  A low-leakage high-sealing safety valve as shown in FIG. 1 includes a joint 1, an elastic member 3, a valve core and a valve body 9. The upper end of the valve body 9 is provided with an internal thread, and the joint 1 is screwed to the internal thread. The elastic member 3 is a spring disposed between the joint 1 and the first valve body 5. The valve core includes a first valve core 5 and a second valve core 8 connected to each other, and the first valve core 5 and the second valve core 8 are centrally opened with a central through hole 10 penetrating through the center; wherein the first valve core The connection between the 5 and the second spool 8 may take various forms, such as: screwing, screwing, welding, etc., as long as the first spool 5 and the second spool 8 are integrally connected. A rupture diaphragm 7 is also disposed between the first spool 5 and the second spool 8 to block the through hole. The rupture disc 7 is provided with a pressure ring 6 for fixing the seal. A first gasket 2 is disposed between the joint 1 and the valve body 9; a second gasket 4 is disposed between the joint 1 and the first valve core 5.
工作原理： 当系统压力在安全工作范围内时， 其工作原理与普通低泄 高封阀相同， 为防止气体灭火系统微量漏气在管路中聚集而发生误启动。 而当压力超出安全工作范围， 产生不安全因素时， 阀芯中间的爆破膜片会 被压力挤爆， 让阀芯中间的通孔贯通， 直接联通阀体进气端和出气端， 起 到安全泄放压力的作用。 Working principle: When the system pressure is within the safe working range, its working principle and ordinary low leakage The high-sealing valve is the same, in order to prevent the micro-leakage of the gas fire-extinguishing system from accumulating in the pipeline, a false start occurs. When the pressure exceeds the safe working range and unsafe factors are generated, the rupture diaphragm in the middle of the valve core will be squeezed by the pressure, allowing the through hole in the middle of the valve core to penetrate, directly connecting the intake end and the outlet end of the valve body to ensure safety. The role of relief pressure.
因此， 本实用新型装置有以下 3种工作状态：  Therefore, the device of the present invention has the following three working states:
1 ) 当处于系统微量漏气， 低压泄放状态时： 由于弹性部件 3的存在， 使阀芯和阀体 9、 接头 1之间存在孔隙， 系统的微量漏气可通过阀芯与阀 体之间的孔隙从出气口排出。  1) When there is a slight leak in the system and a low pressure relief state: Due to the presence of the elastic member 3, there is a gap between the valve core and the valve body 9 and the joint 1, and a slight leak of the system can pass through the valve core and the valve body. The pores are discharged from the gas outlet.
2) 当灭火系统正常启动， 阀体进气压力达到一定程度： 由于爆破膜 片 7的阻隔， 使气流对阀芯产生推力， 产生的推力超过弹性部件 3的弹力 临界值， 使第一阀芯 5向出气端运动， 带动第二垫圈 4挤压出气端接头 1， 达到密封的作用。  2) When the fire extinguishing system starts normally, the inlet pressure of the valve body reaches a certain level: Due to the blockage of the rupture diaphragm 7, the airflow generates thrust to the spool, and the generated thrust exceeds the elastic force threshold of the elastic member 3, so that the first spool 5 moves toward the air outlet end, and drives the second washer 4 to extrude the air end joint 1 to achieve the sealing function.
3 ) 而当压力超出安全工作范围， 产生不安全因素时， 阀芯中间的爆 破膜片 7会被压力挤爆， 使阀芯中间的通孔 10贯通， 直接联通阀体进气 端和出气端， 起到安全泄放压力的作用。  3) When the pressure exceeds the safe working range and the unsafe factor is generated, the rupture diaphragm 7 in the middle of the valve core will be squeezed by the pressure, so that the through hole 10 in the middle of the valve core penetrates, directly connecting the intake end and the outlet end of the valve body , play a role in safe relief pressure.
虽然本实用新型已参照如上所述的具体实施例来描述， 但本技术领域 的普通技术人员应当认识到， 以上实施例仅是用以说明本实用新型而不是 限制本实用新型， 只要在本实用新型的实质精神范围内对上述实施例的变 化、 变型都应落入本申请的权利要求书请求保护的范围。  Although the present invention has been described with reference to the specific embodiments described above, those skilled in the art should understand that the above embodiments are only for illustrating the present invention and not limiting the present invention. Variations and modifications of the above-described embodiments within the scope of the novel spirits are intended to fall within the scope of the claims as claimed.

Claims

权 利 要 求 书 claims
1、 一种低泄高封安全阀， 包括接头 （1)、 弹性部件 （3)、 阀芯和阀 体 （9)， 所述阀体 （9) 上端设有内螺紋， 接头 （1) 与所述内螺紋螺接， 所述阀芯包括相互连接的第一阀芯 （5) 和第二阀芯 （8)， 其特征在于： 所述第一阀芯 （5) 和第二阀芯 （8) 中心开有相互贯通的中心通孔 （10)。 1. A low leakage and high seal safety valve, including a joint (1), an elastic component (3), a valve core and a valve body (9). The upper end of the valve body (9) is provided with an internal thread, and the joint (1) and The internal thread is screwed, and the valve core includes a first valve core (5) and a second valve core (8) that are connected to each other, and is characterized by: the first valve core (5) and the second valve core (8) 8) There is a mutually penetrating central through hole (10) in the center.
2、 根据权利要求 1 所述的一种低泄高封安全阀， 其特征在于： 所述 第一阀芯 （5) 与第二阀芯 （8) 间采用螺紋连接。 2. A low leakage and high sealing safety valve according to claim 1, characterized in that: the first valve core (5) and the second valve core (8) are threadedly connected.
3、 根据权利要求 2所述的一种低泄高封安全阀， 其特征在于： 所述 第一阀芯 （5) 和第二阀芯 （8) 之间还设有爆破膜片 （7)。 3. A low leakage and high sealing safety valve according to claim 2, characterized in that: a bursting diaphragm (7) is provided between the first valve core (5) and the second valve core (8). .
4、 根据权利要求 3 所述的一种低泄高封安全阀， 其特征在于： 所述 爆破膜片 （7) 上设有用于固定密封的压环 （6)。 4. A low leakage and high sealing safety valve according to claim 3, characterized in that: the bursting diaphragm (7) is provided with a pressure ring (6) for fixed sealing.
5、 根据权利要求 1~4 中任一项所述的一种低泄高封安全阀， 其特征 在于： 所述弹性部件 （3) 为弹簧， 设置于接头 （1) 和第一阀芯 （5) 之 间。 5. A low-discharge and high-sealing safety valve according to any one of claims 1 to 4, characterized in that: the elastic component (3) is a spring and is provided at the joint (1) and the first valve core ( 5) between.
6、 根据权利要求 5所述的一种低泄高封安全阀， 其特征在于： 所述 接头 （1) 与阀体 （9) 之间设有第一垫圈 （2); 所述接头 （1) 与第一阀 芯 （5) 之间设有第二垫圈 （4)。 6. A low leakage and high sealing safety valve according to claim 5, characterized in that: a first gasket (2) is provided between the joint (1) and the valve body (9); the joint (1) ) and the first valve core (5) are provided with a second gasket (4).
PCT/CN2013/081498 2012-08-29 2013-08-14 Safety valve with low leakage and high sealing property WO2014032525A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201220434251.7 2012-08-29
CN 201220434251 CN202751723U (en) 2012-08-29 2012-08-29 Low decompression and high sealing safety valve

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Publication Number Publication Date
WO2014032525A1 true WO2014032525A1 (en) 2014-03-06

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PCT/CN2013/081498 WO2014032525A1 (en) 2012-08-29 2013-08-14 Safety valve with low leakage and high sealing property

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WO (1) WO2014032525A1 (en)

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Publication number Priority date Publication date Assignee Title
CN202751723U (en) * 2012-08-29 2013-02-27 西安新思化工设备制造有限公司 Low decompression and high sealing safety valve
CN105972276B (en) * 2016-08-07 2018-11-27 西安航空学院 A kind of exhaust pressure relief safety valve
CN108328135A (en) * 2018-03-23 2018-07-27 上海威泽尔机械设备制造有限公司 A kind of powder storage bin Fluidizer of energy on-line cleaning
CN108771814A (en) * 2018-08-11 2018-11-09 湖南安民科技有限责任公司 Impacting type temperature sensing glass ball starter

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FR2160047A5 (en) * 1971-11-08 1973-06-22 Kidde & Co Walter
CN2638773Y (en) * 2003-06-30 2004-09-08 逄春盛 Battleneck valve
CN2733155Y (en) * 2004-05-11 2005-10-12 西安新竹防灾救生设备有限公司 Pressure container valve
EP2048418A2 (en) * 2007-10-11 2009-04-15 Fiorentini Minireg S.p.A. Safety electrovalve
JP2011094777A (en) * 2009-11-02 2011-05-12 Chiyoda Seiki:Kk Dry type safety switch
CN202327272U (en) * 2011-10-24 2012-07-11 上海磊诺工业气体有限公司 Rising stem type low-leakage high-sealing valve
CN202751723U (en) * 2012-08-29 2013-02-27 西安新思化工设备制造有限公司 Low decompression and high sealing safety valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2160047A5 (en) * 1971-11-08 1973-06-22 Kidde & Co Walter
CN2638773Y (en) * 2003-06-30 2004-09-08 逄春盛 Battleneck valve
CN2733155Y (en) * 2004-05-11 2005-10-12 西安新竹防灾救生设备有限公司 Pressure container valve
EP2048418A2 (en) * 2007-10-11 2009-04-15 Fiorentini Minireg S.p.A. Safety electrovalve
JP2011094777A (en) * 2009-11-02 2011-05-12 Chiyoda Seiki:Kk Dry type safety switch
CN202327272U (en) * 2011-10-24 2012-07-11 上海磊诺工业气体有限公司 Rising stem type low-leakage high-sealing valve
CN202751723U (en) * 2012-08-29 2013-02-27 西安新思化工设备制造有限公司 Low decompression and high sealing safety valve

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