WO2020038008A1 - High-performance nano-coated corrugated-tube special chlorine gas valve - Google Patents
High-performance nano-coated corrugated-tube special chlorine gas valve Download PDFInfo
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- WO2020038008A1 WO2020038008A1 PCT/CN2019/083790 CN2019083790W WO2020038008A1 WO 2020038008 A1 WO2020038008 A1 WO 2020038008A1 CN 2019083790 W CN2019083790 W CN 2019083790W WO 2020038008 A1 WO2020038008 A1 WO 2020038008A1
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- valve
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- chlorine gas
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- stem
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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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
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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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
- F16K1/465—Attachment of sealing rings to the valve seats
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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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Definitions
- the invention relates to the technical field of design of a bellows chlorine gas special valve.
- valves used in the chemical industry in China's chemical industry to control the flow of chlorine gas and liquid chlorine pipeline media are ordinary ordinary chlorine gas valves. Due to the lack of special features in material selection and valve structure, on the one hand, the performance of this valve is unstable. The sealing effect is not good; on the other hand, under the corrosive, poisonous and harmful process conditions, the corrosion resistance is poor, easy to leak, the casing is easy to perforate, and the bellows is easy to wear, resulting in a short overall service life of the valve, which cannot meet the long-term effective transport of the medium. Special requirements, and once the toxic medium leaks, it will bring great harm to the surrounding environment and personal safety.
- the purpose of the present invention is to solve the above problems and provide a high-performance nano-coated bellows chlorine gas special valve with good sealing effect, not easy to leak, and long service life.
- the invention includes a valve body, a valve seat, a valve disc, a bellows assembly, a valve cover, a valve stem, a stuffing gland, a transmission rod, a guide block, a transmission nut, and a hand wheel; the valve seat, the valve disc, and the valve stem are respectively provided.
- the valve disc is disposed at the end of the valve stem; the valve cover is disposed above the valve body; the upper end of the valve stem is floatingly connected to the transmission rod through a guide block, and the transmission rod is connected to the hand wheel through a transmission nut
- the bellows assembly is provided between the valve cover and the valve stem; the bellows assembly includes a bellows; a stuffing box is arranged above the bellows; the upper end of the stuffing box is welded to the valve cover; A positioning sleeve is arranged below, and the positioning sleeve is welded to the valve stem; a sealing packing is arranged in the stuffing box; the packing gland is arranged above the sealing packing and is connected with the valve cover by bolts.
- the sealing packing of the present invention uses polytetrafluoroethylene packing as the safety seal of the valve stem, effectively preventing the bellows from being damaged, controlling the medium in the valve body cavity to prevent leakage; the upper end of the stuffing box of the bellows assembly of the present invention is welded to the valve cover, and the lower end is The shaft sleeve is welded with the valve stem to effectively control the fluid in the valve body cavity, thereby forming a multi-stage seal and improving the sealing effect.
- the valve body of the invention adopts LCB low-temperature carbon steel as a whole for investment casting, which solves the problem that the low-temperature performance of conventional ordinary cast steel can not meet the working conditions.
- the guide block is made of CF8 stainless steel, which solves the problem of rusting, jamming, and even fracture of nodular cast iron in the past, which is safe and reliable.
- anticorrosive protective coatings are respectively provided on the surfaces of the valve body, the valve flap, the valve cover, and the valve stem in contact with the medium.
- the anti-corrosion protective coating used is Cr / Cr (X) N nano-composite ceramic coating. After coating, it not only guarantees the internal corrosion protection of the over-current medium, but also guarantees the external corrosion protection of the valve, which solves the valve installation in the open air or the chemical industry. Atmospheric corrosion can achieve the effects of safety, environmental protection and energy saving.
- the sealing packing according to the present invention is a multi-stage "V" shaped sealing packing, which enhances the sealing effect, and can effectively control the fluid medium in the valve body cavity after the bellows is damaged due to long-term fatigue, and effectively control the leakage of the medium. Reached zero leakage.
- An annular groove is provided on the upper surface of the valve seat, and a seal fitting in a shape of the annular groove is provided in the annular groove; the seal is sintered with the valve seat to improve the sealing performance.
- a frustum is integrally provided on the lower end surface of the valve disc.
- the frustum is matched with the seal on the valve seat to seal.
- a contact surface of the frustum and the seal is provided with a hard alloy layer.
- the alloy layer cooperates with the seal on the surface of the valve seat to form a double cone and flat seal, which fully achieves the design effect of zero leakage in the valve's internal seal; the hard alloy on the valve sealing surface and the polytetrafluoroethylene on the valve sealing surface form a hard and soft seal.
- the valve seat has the effect of automatic sealing compensation, so as to achieve a gap-free seal and completely zero leakage.
- FIG. 1 is a schematic structural diagram of the present invention.
- FIG. 2 is an enlarged view of part A of FIG. 1.
- the present invention includes a valve body 1, a valve seat 2, a valve disc 3, a bellows assembly 4, a valve cover 5, a valve stem 6, a packing gland 7, a transmission rod 8, a guide block 9, and a transmission.
- the nut 10, the hand wheel 11, the valve seat 2, the valve disc 3, and the valve stem 6 are respectively disposed in the valve body 1, the valve disc 3 is disposed at the end of the valve stem 6, the valve cover 5 is disposed above the valve body 1, and the valve stem 6
- the upper end is floatingly connected to the transmission rod 8 through the guide block 9, and the transmission rod 8 is connected to the hand wheel 11 through the transmission nut 10;
- the bellows assembly 4 is arranged between the valve cover 5 and the valve stem 6;
- the bellows assembly 4 includes a bellows 4- 1.
- a stuffing box 12 is arranged above the bellows 4-1, and the upper end of the stuffing box 12 is welded to the valve cover 5; a positioning sleeve 13 is arranged below the bellows 4-1, and the positioning shaft sleeve 13 is welded to the valve stem 6; A multi-stage "V" shaped packing 14 is provided in 12; a packing gland 7 is disposed above the multi-stage "V” shaped packing 14 and is connected to the valve cover 5 by bolts.
- An annular groove is provided on the upper surface of the valve seat 2, and a seal 15 matching the shape of the annular groove is provided in the annular groove; the seal 15 is sintered with the valve seat 2 as a whole; a cone is integrally provided on the lower end surface of the valve disc 3
- the table 3-1, the frustum 3-1 and the sealing member 15 on the valve seat 2 cooperate to seal.
- a contact surface between the frustum 3-1 and the sealing member 15 is provided with a hard alloy layer 16.
- Anticorrosive protective coatings 17 are respectively provided on the surfaces of the valve body 1, the valve flap 3, the valve cover 5, and the valve stem 6 in contact with the medium.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
A high-performance nano-coated corrugated-tube special chlorine gas valve, relating to the technical field of corrugated-tube special chlorine gas valve designs. The valve comprises a valve body (1), a valve seat (2), a valve disc (3), a corrugated tube assembly (4), a valve cover (5), a valve stem (6), a packing gland (7), a transmission rod (8), a guide block (9), a transmission nut (10), and a handwheel (11). The valve seat (2), the valve disc (3), and the valve stem (6) are provided in the valve body (1), and the valve disc (3) is arranged at an end of the valve stem (6). The valve cover (5) is provided above the valve body (1). An upper end of the valve rod (6) is connected to the transmission rod (8) in a floating manner by means of the guide block (9), and the transmission rod (8) is connected to the handwheel (11) by means of the transmission nut (10). The corrugated tube assembly (4) is provided between the valve cover (5) and the valve stem (6). The corrugated tube assembly (4) comprises a corrugated tube (4-1). A stuffing box (12) is provided above the corrugated tube (4-1), and an upper end of the stuffing box (12) is welded to the valve cover (5). A positioning bushing (13) is provided below the corrugated tube (4-1), and the positioning bushing (13) is welded to the valve stem (6). Sealing packing (14) is provided in the stuffing box (12). The packing gland (7) is provided above the sealing packing (14), and is connected to the valve cover (5) by a bolt. The device has a good sealing effect, does not leak easily, has a long service life, and is safe and reliable.
Description
本发明涉及波纹管氯气专用阀门的设计技术领域。The invention relates to the technical field of design of a bellows chlorine gas special valve.
目前,我国化工行业用于氯气、液氯管路介质控制介质流动的阀门为一般普通氯气阀,由于在选材上还是阀门结构上都不具备专用的特点,一方面这种阀门的性能不稳定,密封效果不好;另一方面在腐蚀、有毒有害的工艺条件下,耐腐蚀性能差,易泄漏,壳体易穿孔,波纹管易磨损从而导致阀门整体使用寿命短,不能满足长期有效输送介质的特殊要求,而有毒介质一旦泄漏,会对周边环境和人身安全带来很大的危害。At present, the valves used in the chemical industry in China's chemical industry to control the flow of chlorine gas and liquid chlorine pipeline media are ordinary ordinary chlorine gas valves. Due to the lack of special features in material selection and valve structure, on the one hand, the performance of this valve is unstable. The sealing effect is not good; on the other hand, under the corrosive, poisonous and harmful process conditions, the corrosion resistance is poor, easy to leak, the casing is easy to perforate, and the bellows is easy to wear, resulting in a short overall service life of the valve, which cannot meet the long-term effective transport of the medium. Special requirements, and once the toxic medium leaks, it will bring great harm to the surrounding environment and personal safety.
发明内容Summary of the Invention
本发明目的在于针对以上问题,提供一种密封效果好、不易泄漏,使用寿命长的高性能纳米涂层波纹管氯气专用阀。The purpose of the present invention is to solve the above problems and provide a high-performance nano-coated bellows chlorine gas special valve with good sealing effect, not easy to leak, and long service life.
本发明包括阀体、阀座、阀瓣、波纹管组件、阀盖、阀杆、填料压盖、传动杆、导向块、传动螺母、手轮;所述阀座、阀瓣、阀杆分别设置于阀体内,所述阀瓣设置于阀杆的末端;所述阀盖设置于阀体上方;所述阀杆上端通过导向块与传动杆浮动连接,所述传动杆通过传动螺母与手轮连接;所述波纹管组件设置于阀盖与阀杆之间;所述波纹管组件包括波纹管,在所述波纹管上方设置填料函,所述填料函上端与阀盖焊接;在所述波纹管下方设置定位轴套,所述定位轴套与阀杆焊接;在所述填料函内设置密封填料;所述填料压盖设置于密封填料上方且与阀盖之间通过螺栓连接。The invention includes a valve body, a valve seat, a valve disc, a bellows assembly, a valve cover, a valve stem, a stuffing gland, a transmission rod, a guide block, a transmission nut, and a hand wheel; the valve seat, the valve disc, and the valve stem are respectively provided. In the valve body, the valve disc is disposed at the end of the valve stem; the valve cover is disposed above the valve body; the upper end of the valve stem is floatingly connected to the transmission rod through a guide block, and the transmission rod is connected to the hand wheel through a transmission nut The bellows assembly is provided between the valve cover and the valve stem; the bellows assembly includes a bellows; a stuffing box is arranged above the bellows; the upper end of the stuffing box is welded to the valve cover; A positioning sleeve is arranged below, and the positioning sleeve is welded to the valve stem; a sealing packing is arranged in the stuffing box; the packing gland is arranged above the sealing packing and is connected with the valve cover by bolts.
本发明密封填料采用聚四氟乙烯填料,作为阀杆的保险密封,有效防止波纹管损坏,将介质控制在阀门体腔内,防止外漏;本发明波纹管组件填料函上端与阀盖焊接,下端轴套与阀杆焊接,有效地把流体控制在阀门体腔内,以此形成多级密封,提高密封效果。本发明阀体采用LCB低温碳素钢整体熔模铸造,解决以往的普通铸钢低温性能不能满足工况的使用要求,个别厂家采用球墨铸铁更加不符合国家相关标准的规定要求,易腐蚀、穿孔,安全隐患大;导向块采用CF8不锈钢材料精铸而成,解决以往采用球墨铸铁材料易锈蚀,发生卡阻,甚至断裂现象的发生,安全可靠。The sealing packing of the present invention uses polytetrafluoroethylene packing as the safety seal of the valve stem, effectively preventing the bellows from being damaged, controlling the medium in the valve body cavity to prevent leakage; the upper end of the stuffing box of the bellows assembly of the present invention is welded to the valve cover, and the lower end is The shaft sleeve is welded with the valve stem to effectively control the fluid in the valve body cavity, thereby forming a multi-stage seal and improving the sealing effect. The valve body of the invention adopts LCB low-temperature carbon steel as a whole for investment casting, which solves the problem that the low-temperature performance of conventional ordinary cast steel can not meet the working conditions. Some manufacturers use nodular cast iron to meet the requirements of relevant national standards, which is easy to corrode and perforate. , The safety hazard is great; the guide block is made of CF8 stainless steel, which solves the problem of rusting, jamming, and even fracture of nodular cast iron in the past, which is safe and reliable.
本发明在所述阀体、阀瓣、阀盖、阀杆与介质接触的表面分别设置防腐保护涂层。所用防腐保护涂层为Cr/Cr(X)N纳米复合陶瓷涂层,涂层后,不但保证了过流介质的内防腐,而且保证了阀门的外防腐,解决了阀门露天安装,或化工工况大气腐蚀,达到安全、环 保、节能的效果。In the invention, anticorrosive protective coatings are respectively provided on the surfaces of the valve body, the valve flap, the valve cover, and the valve stem in contact with the medium. The anti-corrosion protective coating used is Cr / Cr (X) N nano-composite ceramic coating. After coating, it not only guarantees the internal corrosion protection of the over-current medium, but also guarantees the external corrosion protection of the valve, which solves the valve installation in the open air or the chemical industry. Atmospheric corrosion can achieve the effects of safety, environmental protection and energy saving.
本发明所述密封填料为多级“V”形密封填料,增强密封效果,可以在波纹管因长期使用疲劳损坏后,有效地把流体介质控制在阀门体腔内,有效控制介质的外漏,完全达到零外漏。The sealing packing according to the present invention is a multi-stage "V" shaped sealing packing, which enhances the sealing effect, and can effectively control the fluid medium in the valve body cavity after the bellows is damaged due to long-term fatigue, and effectively control the leakage of the medium. Reached zero leakage.
本发明所述阀座上表面设有环形凹槽,在所述环形凹槽内设置与环形凹槽形状配合的密封件;所述密封件与阀座烧结为一体,提高密封性能。An annular groove is provided on the upper surface of the valve seat, and a seal fitting in a shape of the annular groove is provided in the annular groove; the seal is sintered with the valve seat to improve the sealing performance.
本发明在所述阀瓣的下端面一体设置锥台,所述锥台与阀座上的密封件配合密封,在所述锥台与密封件的接触面上设有硬质合金层,硬质合金层与阀座表面的密封件配合,形成锥、平面双重密封,完全达到了阀门内密封零泄漏的设计效果;阀瓣密封面硬质合金与阀座密封面聚四氟乙烯形成硬软密封配对,阀座具有密封自动补偿的效果,从而达到了无间隙密封,完全达到零内漏。According to the present invention, a frustum is integrally provided on the lower end surface of the valve disc. The frustum is matched with the seal on the valve seat to seal. A contact surface of the frustum and the seal is provided with a hard alloy layer. The alloy layer cooperates with the seal on the surface of the valve seat to form a double cone and flat seal, which fully achieves the design effect of zero leakage in the valve's internal seal; the hard alloy on the valve sealing surface and the polytetrafluoroethylene on the valve sealing surface form a hard and soft seal. Paired, the valve seat has the effect of automatic sealing compensation, so as to achieve a gap-free seal and completely zero leakage.
图1为本发明的结构示意图。FIG. 1 is a schematic structural diagram of the present invention.
图2为图1的A部放大图。FIG. 2 is an enlarged view of part A of FIG. 1.
如图1、2所示,本发明包括阀体1、阀座2、阀瓣3、波纹管组件4、阀盖5、阀杆6、填料压盖7、传动杆8、导向块9、传动螺母10、手轮11;阀座2、阀瓣3、阀杆6分别设置于阀体1内,阀瓣3设置于阀杆6的末端;阀盖5设置于阀体1上方;阀杆6上端通过导向块9与传动杆8浮动连接,传动杆8通过传动螺母10与手轮11连接;波纹管组件4设置于阀盖5与阀杆6之间;波纹管组件4包括波纹管4-1,在波纹管4-1上方设置填料函12,填料函12上端与阀盖5焊接;在波纹管4-1下方设置定位轴套13,定位轴套13与阀杆6焊接;在填料函12内设置多级“V”形密封填料14;填料压盖7设置于密封多级“V”形密封填料14的上方且与阀盖5之间通过螺栓连接。As shown in Figures 1 and 2, the present invention includes a valve body 1, a valve seat 2, a valve disc 3, a bellows assembly 4, a valve cover 5, a valve stem 6, a packing gland 7, a transmission rod 8, a guide block 9, and a transmission. The nut 10, the hand wheel 11, the valve seat 2, the valve disc 3, and the valve stem 6 are respectively disposed in the valve body 1, the valve disc 3 is disposed at the end of the valve stem 6, the valve cover 5 is disposed above the valve body 1, and the valve stem 6 The upper end is floatingly connected to the transmission rod 8 through the guide block 9, and the transmission rod 8 is connected to the hand wheel 11 through the transmission nut 10; the bellows assembly 4 is arranged between the valve cover 5 and the valve stem 6; the bellows assembly 4 includes a bellows 4- 1. A stuffing box 12 is arranged above the bellows 4-1, and the upper end of the stuffing box 12 is welded to the valve cover 5; a positioning sleeve 13 is arranged below the bellows 4-1, and the positioning shaft sleeve 13 is welded to the valve stem 6; A multi-stage "V" shaped packing 14 is provided in 12; a packing gland 7 is disposed above the multi-stage "V" shaped packing 14 and is connected to the valve cover 5 by bolts.
在阀座2上表面设有环形凹槽,在环形凹槽内设置与环形凹槽形状配合的密封件15;密封件15与阀座2烧结为一体;在阀瓣3的下端面一体设置锥台3-1,锥台3-1与阀座2上的密封件15配合密封,在锥台3-1与密封件15的接触面上设有硬质合金层16。An annular groove is provided on the upper surface of the valve seat 2, and a seal 15 matching the shape of the annular groove is provided in the annular groove; the seal 15 is sintered with the valve seat 2 as a whole; a cone is integrally provided on the lower end surface of the valve disc 3 The table 3-1, the frustum 3-1 and the sealing member 15 on the valve seat 2 cooperate to seal. A contact surface between the frustum 3-1 and the sealing member 15 is provided with a hard alloy layer 16.
在所述阀体1、阀瓣3、阀盖5、阀杆6与介质接触的表面分别设置防腐保护涂层17。Anticorrosive protective coatings 17 are respectively provided on the surfaces of the valve body 1, the valve flap 3, the valve cover 5, and the valve stem 6 in contact with the medium.
Claims (5)
- 高性能纳米涂层波纹管氯气专用阀,其特征在于:包括阀体、阀座、阀瓣、波纹管组件、阀盖、阀杆、填料压盖、传动杆、导向块、传动螺母、手轮;所述阀座、阀瓣、阀杆分别设置于阀体内,所述阀瓣设置于阀杆的末端;所述阀盖设置于阀体上方;所述阀杆上端通过导向块与传动杆浮动连接,所述传动杆通过传动螺母与手轮连接;所述波纹管组件设置于阀盖与阀杆之间;所述波纹管组件包括波纹管,在所述波纹管上方设置填料函,所述填料函上端与阀盖焊接;在所述波纹管下方设置定位轴套,所述定位轴套与阀杆焊接;在所述填料函内设置密封填料;所述填料压盖设置于密封填料上方且与阀盖之间通过螺栓连接。High performance nano-coated bellows chlorine gas special valve, which is characterized by including valve body, valve seat, valve disc, bellows assembly, valve cover, valve stem, packing gland, transmission rod, guide block, transmission nut, hand wheel The valve seat, the valve disc, and the valve stem are respectively disposed in the valve body, the valve disc is disposed at the end of the valve stem; the valve cover is disposed above the valve body; the upper end of the valve stem is floated through the guide block and the transmission lever Connection, the transmission rod is connected with the hand wheel through a transmission nut; the bellows component is arranged between the valve cover and the valve stem; the bellows component includes a bellows, and a stuffing box is arranged above the bellows, the The upper end of the stuffing box is welded to the valve cover; a positioning sleeve is arranged below the bellows, and the positioning shaft sleeve is welded to the valve stem; a sealing packing is arranged in the stuffing box; the packing gland is arranged above the sealing packing and It is bolted to the valve cover.
- 根据权利要求1所述的高性能纳米涂层波纹管氯气专用阀,其特征在于:在所述阀体、阀瓣、阀盖、阀杆与介质接触的表面分别设置防腐保护涂层。The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: anti-corrosion protective coatings are respectively provided on surfaces of the valve body, the valve flap, the valve cover, and the valve stem in contact with the medium.
- 根据权利要求1所述的高性能纳米涂层波纹管氯气专用阀,其特征在于:所述密封填料为多级“V”形密封填料。The high-performance nano-coated bellows chlorine gas special valve according to claim 1, wherein the sealing packing is a multi-stage "V" shaped sealing packing.
- 根据权利要求1所述的高性能纳米涂层波纹管氯气专用阀,其特征在于:所述阀座上表面设有环形凹槽,在所述环形凹槽内设置与环形凹槽形状配合的密封件;所述密封件与阀座烧结为一体。The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: the upper surface of the valve seat is provided with an annular groove, and a seal matching the shape of the annular groove is provided in the annular groove. The seal is sintered with the valve seat as a whole.
- 根据权利要求1所述的高性能纳米涂层波纹管氯气专用阀,其特征在于:在所述阀瓣的下端面一体设置锥台,所述锥台与阀座上的密封件配合密封,在所述锥台与密封件的接触面上设有硬质合金层。The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: a conical frustum is integrally provided on the lower end surface of the valve disc, and the conical frustum cooperates with a seal on a valve seat to seal. The contact surface between the frustum and the seal is provided with a hard alloy layer.
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CN108775406A (en) * | 2018-08-21 | 2018-11-09 | 江苏金晟元特种阀门股份有限公司 | High-performance nano coating corrugated tube valve special for chlorine |
CN109538775A (en) * | 2019-01-11 | 2019-03-29 | 江苏金晟元特种阀门股份有限公司 | Resistance to strong rotten particle-resistant fluoroplastic all-liner shut-off valve |
CN112984128A (en) * | 2021-02-18 | 2021-06-18 | 浙江万龙机械有限公司 | Corrugated pipe flushing-free valve |
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