1.針型截止閥
1. Needle stop valve
是作為精確的流量控制用的。閥瓣通常于閥桿做成一體，它有一個與閥座配合、精度非常高的針妝頭部。而且針型截止閥閥桿螺紋的螺距比一般普通截止閥的閥桿螺紋螺距要細。在通常情況下，昆山良工閥門針型截止閥閥座孔的尺寸比管道尺寸小。因此，它通常只限于在公稱通徑小的管線中適用，更多的用于取樣閥。
It is used for accurate flow control. The valve disc is usually integrated with the valve stem. It has a needle makeup head with high precision that fits with the valve seat. Moreover, the thread pitch of needle stop valve stem thread is thinner than that of common stop valve stem thread. In general, the size of the valve seat hole of Kunshan Lianggong needle stop valve is smaller than that of the pipe. Therefore, it is usually only applicable to the pipeline with small nominal diameter, and more used for sampling valves.
2.直流式截止閥
2. DC stop valve
直流式截止閥的閥桿和通道成一定的角度，其閥座密封面與進出口通道也有一定的角度，閥體可制成整體式或分開式。閥體分開式截止閥用兩閥體把閥座夾在中間， 便于維修。這類截止閥使流體幾乎不改變流動方向，在截止閥中流阻更小。閥座和閥瓣密封面可堆焊硬質合金，使整個閥門更耐沖刷和腐蝕，非常符合于氧化鋁生產工藝流程中的管路控制，同時也適合于有結焦和固體顆粒的管道中。
The valve rod and channel of the direct-current stop valve form a certain angle, and the sealing surface of its valve seat also has a certain angle with the inlet and outlet channels. The valve body can be made into integral or separate type. The valve seat of the valve body split stop valve is clamped in the middle by two valve bodies for easy maintenance. This type of stop valve makes the flow direction of the fluid almost unchanged, and the flow resistance in the stop valve is minimum. The sealing surface of valve seat and valve disc can be welded with cemented carbide to make the whole valve more resistant to erosion and corrosion, which is very suitable for pipeline control in alumina production process, and also suitable for pipelines with coking and solid particles.
3.角式截止閥
3. Angle stop valve
角式截止閥的優(yōu)點是可以把閥門安裝在管路系統(tǒng)的拐角處，這樣既節(jié)約了90°彎頭，又便于操作。因此，這類閥門更適合在化肥廠的合成氨生產系統(tǒng)中和制冷 系統(tǒng)中采用。如J44H-160、J44H-320、L44H-160、L44H-320就完全是為合成氨生產系統(tǒng)而設計的。
The biggest advantage of angle stop valve is that the valve can be installed at the corner of the pipeline system, which not only saves 90 ° elbow, but also facilitates operation. Therefore, this type of valve is most suitable for use in the synthetic ammonia production system and refrigeration system of fertilizer plants. For example, J44H-160, J44H-320, L44H-160 and L44H-320 are completely designed for synthetic ammonia production system.
4.鋼球或瓷球密封截止閥
4. Steel ball or porcelain ball sealing stop valve
該閥的結構特點是閥體分為連體式和分體式，閥瓣為STL硬質合金鋼球或為非晶材料經制粉成形、高溫燒結、精研制成的瓷球。閥桿下端滾壓包絡球體在閥桿球孔 內，球體在閥桿的球孔內做三維轉動時可產生無數條密封線，大大增加了密封面的使用壽命，還能保證可靠的密封。該閥由于受球體密封的限制，一般都用于較小的公稱通經，約為6～25mm。該閥適用于核電廠、火電廠的高溫高壓蒸汽管路，取樣、排污系統(tǒng)的儀表管路以及石化、化工系統(tǒng)中的耐溫、耐壓、耐磨損、耐腐蝕的管路上。
The structural feature of the valve is that the valve body is divided into two types: the connected type and the split type. The valve disc is made of STL cemented carbide steel ball or ceramic ball made of amorphous material through powder forming, high temperature sintering and fine grinding. The rolling envelope ball at the lower end of the valve rod is in the ball hole of the valve rod. When the ball rotates in three dimensions in the ball hole of the valve rod, countless sealing lines can be generated, which greatly increases the service life of the sealing surface and ensures reliable sealing. Due to the restriction of ball sealing, the valve is generally used for small nominal diameter, about 6~25mm. This valve is applicable to the high-temperature and high-pressure steam pipeline of nuclear power plant and thermal power plant, the instrument pipeline of sampling and blowdown system, and the pipeline with temperature resistance, pressure resistance, wear resistance and corrosion resistance in petrochemical and chemical systems.
5.高溫高壓電站截止閥
5. High temperature and high pressure power station stop valve
該閥的結構特點是閥體與閥蓋的連接均采用壓力自緊密封式或夾箍式，閥體與管路的連接形式為對接焊連接，閥體材料多采用鉻鉬鋼或鉻鉬釩鋼，密封面大都堆焊硬質合金。因此，該類閥門耐高溫高壓，抗熱性好；密封面耐磨損、耐擦傷、耐腐蝕，密封性能好，壽命長。更適用于火電工業(yè)系統(tǒng)、石油化工系統(tǒng)及冶金等的高溫高壓、蒸汽、油品、過熱蒸汽的管路上。
The structural feature of the valve is that the connection between the valve body and the bonnet is of pressure self-tightening sealing type or clamp type, the connection between the valve body and the pipeline is of butt welding type, the valve body is mostly made of chrome-molybdenum steel or chrome-molybdenum-vanadium steel, and the sealing surface is mostly hardfacing. Therefore, this kind of valve has high temperature and high pressure resistance and good heat resistance; The sealing surface is wear resistant, scratch resistant and corrosion resistant, with good sealing performance and long service life. It is most suitable for the pipelines of high temperature and high pressure, steam, oil and superheated steam in thermal power industrial systems, petrochemical systems and metallurgy.
6.API截止閥
6. API stop valve
該類截止閥嚴格參照ASMEB16.34標準進行設計；閥體與閥蓋的連接、填料函、閥桿螺母的安裝、上密封等均嚴格按照API600進行設計。閥門選材完全符合API600要求。結 構長度符合ASMEB16.10；法蘭連接尺寸符合ANSI/ASMEB16.5a。閥門的檢驗與試驗嚴格按照API598進行。因此，該閥廣泛適用石油化工管路，在電力、冶金、紡織等系統(tǒng)也適用。
This type of stop valve is designed in strict accordance with ASMEB16.34 standard; The connection between the valve body and the bonnet, the installation of the stuffing box, the valve stem nut and the upper seal are all designed in strict accordance with API600. The valve material selection fully meets the requirements of API600. The structure length shall comply with ASMEB16.10; Flange connection size shall comply with ANSI/ASME B16.5a. The inspection and test of valves shall be carried out in strict accordance with API 598. Therefore, the valve is widely applicable to petrochemical pipelines, as well as electric power, metallurgy, textile and other systems.
7.氧氣管路用截止閥
7. Stop valve for oxygen pipeline
該閥嚴格按氧氣管路的要求進行設計。填料箱部分嚴格密封，外界污物絕對不能進入填料箱內。閥體兩端法蘭有接地裝置，在管路上安裝完畢后，應接地，嚴防靜電起火。本閥門的殼體材料為奧氏體不銹鋼或銅材，導電好、不易發(fā)生靜電起火。密封到材料為聚四氟乙烯對閥體本體材料，為軟密封，密封性能好，氣體檢驗泄漏量為零。本閥門在組裝前嚴格經四氯化碳脫脂處理，絕對沒有油脂和污物，不致引起靜電起火。該閥適用于冶金系統(tǒng)的氧氣管路，在其他行業(yè)的氧氣管路上也適用。
The valve is designed in strict accordance with the requirements of oxygen pipeline. The stuffing box shall be strictly sealed, and external dirt shall not enter the stuffing box. The flanges at both ends of the valve body are equipped with grounding devices, which should be grounded after installation on the pipeline to prevent electrostatic fire. The shell material of this valve is austenitic stainless steel or copper, which has good conductivity and is not easy to cause electrostatic fire. The sealing material is polytetrafluoroethylene to the body material of the valve body, which is a soft seal with good sealing performance, and the gas leakage is zero. The valve is strictly degreased by carbon tetrachloride before assembly, and it is absolutely free of grease and dirt, which will not cause static fire. This valve is applicable to the oxygen pipeline of metallurgical system, as well as the oxygen pipeline of other industries.
8.石油液化氣截止閥
8. LPG stop valve
該閥專為石油液化氣的管路或裝置設計。結構上注意了防火要求。填料采用聚四氟乙烯，密封可靠、絕對物外漏。密封副材料采用聚四氟乙烯或尼龍對閥體本體材料，為軟密封，密封可靠。該閥適用于液化石油氣管路系統(tǒng)，作為啟閉裝置，也適用于其他溫度≤80℃的管路。
This valve is specially designed for pipeline or device of liquefied petroleum gas. Pay attention to fire protection requirements in structure. The packing is made of polytetrafluoroethylene, with reliable sealing and absolute leakage. The sealing pair is made of polytetrafluoroethylene or nylon, which is soft and reliable. This valve is applicable to the liquefied petroleum gas pipeline system, as the opening and closing device, and also to other pipelines with temperature ≤ 80 ℃.
9.上螺紋閥桿截止閥
9. Upper threaded stem stop valve
該類截止閥的閥桿不與工作介質直接接觸。根據殼體材料、密封副材料、填料材料、閥桿材料不同，適用于不同的工況。若閥體、閥蓋材料為碳素鋼，密封副材料為合金鋼，填料為柔性石墨，閥桿材料為Cr13系不銹鋼，適用于水、蒸汽、油品管路；若閥體和閥蓋材料為1Cr18Ni9或0Cr18Ni9，密封副材料為閥體本身材料或硬質合金，填料為聚四氟乙烯，閥桿材料為Cr17Ni2，適用于以xiao酸為基的腐蝕性介質管路或裝置上；若閥體閥蓋材料為1Cr18Ni12Mo2Ti或0Cr18Ni12Mo2Ti，密封副材料為閥體本身材料或硬質合金，填料為聚四氟乙烯，閥桿材料為1Cr18Ni12Mo2Ti，適用于以醋酸為主的腐蝕性介質管路或裝置上。不過該類截止閥的公稱通經為200mm，200以上的截止閥要設旁通閥或 設計上設置內旁通結構。一般，DN≥200mm的截止閥的進口端都在閥瓣的上方，即高進低出，這是為了防止關閉時太費力和閥桿過粗的緣故。
The valve stem of this type of stop valve does not directly contact with the working medium. It is applicable to different working conditions according to different shell materials, sealing pair materials, packing materials and valve rod materials. If the valve body and bonnet are made of carbon steel, the sealing pair is made of alloy steel, the packing is made of flexible graphite, and the valve rod is made of Cr13 series stainless steel, which is applicable to water, steam and oil pipelines; If the material of valve body and bonnet is 1Cr18Ni9 or 0Cr18Ni9, the material of sealing pair is the material of valve body itself or hard alloy, the filler is polytetrafluoroethylene, and the material of valve rod is Cr17Ni2, which is applicable to the corrosive medium pipeline or device based on xiao acid; If the material of valve body and bonnet is 1Cr18Ni12Mo2Ti or 0Cr18Ni12Mo2Ti, the material of sealing pair is the material of valve body itself or hard alloy, the filler is polytetrafluoroethylene, and the material of valve rod is 1Cr18Ni12Mo2Ti, which is applicable to the corrosive medium pipeline or device mainly composed of acetic acid. However, the maximum nominal diameter of this type of stop valve is 200 mm, and the stop valve above 200 shall be equipped with bypass valve or internal bypass structure in design. Generally, the inlet end of the stop valve with DN ≥ 200mm is above the valve disc, that is, high inlet and low outlet, which is to prevent too much effort and too thick valve stem when closing.
10.下螺紋閥桿截止閥
10. Lower threaded stem stop valve
該類截止閥阿的閥桿螺紋直接與工作介質接觸，直接受介質的侵蝕，使閥桿螺紋易銹蝕、造成啟閉費力。此種結構的截止閥其公稱通經都比較小，一般在6～50mm之間，大部分用在儀表閥和取樣閥。
The valve rod thread of this type of stop valve is directly in contact with the working medium, and is directly eroded by the medium, which makes the valve rod thread easy to rust, causing the difficulty of opening and closing. The nominal diameter of the stop valve with this structure is relatively small, generally between 6 and 50 mm, and most of them are used for instrument valves and sampling valves.
11.API602鍛鋼截止閥
11. API602 forged steel stop valve
該類截止閥按石油協會標準API602進行設計，閥體和閥蓋碳鋼或不銹鋼鍛造而成，閥體和閥蓋連接有螺栓連接、螺紋連接加焊接，有上螺紋閥桿和下螺紋 閥桿之分，密封副材料為Cr13鋼、不銹鋼酸鋼對STL硬質合金，填料為柔性石墨或聚四氟乙烯，連接方式有法蘭、螺紋、承插焊和對接焊，壓力等級為CL150～CL1500，公稱通經為1/4～2in。廣泛地應用于石油化工、電力、化工等部門地裝置和管路上，工作介質為蒸汽、油品，腐蝕性介質。結構 長度按ASMEB16.10，法蘭連接尺寸按ASME/ANSIB16.5a，焊端尺寸符合ASMEB16.25，承插焊孔尺寸符合ANSIB16.11，螺紋連接端尺寸符合ANSIB1.20.1。
This type of stop valve is designed according to the API 602 standard. The valve body and bonnet are forged from carbon steel or stainless steel. The valve body and bonnet are connected by bolts, threads and welding. There are upper threaded valve stem and lower threaded valve stem. The sealing pair material is Cr13 steel, stainless steel acid steel to STL cemented carbide, the filler is flexible graphite or polytetrafluoroethylene, and the connection method includes flange, thread, socket welding and butt welding, The pressure rating is CL150 ～ CL1500, and the nominal diameter is 1/4 ～ 2in. It is widely used in devices and pipelines in petrochemical, electric power, chemical and other departments. The working medium is steam, oil and corrosive medium. The structure length shall comply with ASMEB16.10, the flange connection size shall comply with ASME/ANSIB16.5a, the welding end size shall comply with ASMEB16.25, the socket welding hole size shall comply with ANSIB16.11, and the screw connection end size shall comply with ANSIB1.20.1.
12.柱塞截止閥
12. Plunger stop valve
該類柱塞閥屬徑向密封，由套在磨光柱塞上地兩個彈性密封圈來實現。兩個彈性密封圈用一個套環(huán)隔離開，并通過閥體與閥蓋地連接螺栓施加在閥蓋上地載荷把柱塞 周圍地彈性密封圈壓牢，保證密封。該閥地材料組合為殼體用碳鋼，柱塞用Cr13不銹鋼，密封圈用柔性石墨，可用于水、蒸汽、油品地管路；若殼體用不銹耐酸 鋼，柱塞用不銹耐酸鋼，密封圈用聚四氟乙烯，適用于酸、堿類腐蝕性介質。該閥地優(yōu)點是密封可靠，壽命比較長，維修簡便；缺點是啟閉速度慢。該類閥門廣泛應 用于城建系統(tǒng)，城市供熱中的水、蒸汽管路上。
This type of plunger valve belongs to radial sealing, which is realized by two elastic sealing rings sleeved on the polished plunger. The two elastic seal rings are separated by a collar, and the elastic seal rings around the plunger are pressed firmly by the load applied on the bonnet by the connecting bolts of the valve body and bonnet to ensure sealing. The valve material combination is carbon steel for shell, Cr13 stainless steel for plunger and flexible graphite for sealing ring, which can be used for water, steam and oil pipelines; If the shell is made of stainless acid-resistant steel, the plunger is made of stainless acid-resistant steel, and the sealing ring is made of polytetrafluoroethylene, which is suitable for acid and alkali corrosive media. The valve has the advantages of reliable sealing, long service life and easy maintenance; The disadvantage is that the opening and closing speed is slow. These valves are widely used in water and steam pipelines in urban construction systems and urban heating.
13.波紋管截止閥
13. Bellows stop valve
波紋管截止閥也叫波紋管密封截止閥，通過自動滾焊焊接，在流體介質和大氣之間形成一個金屬屏障，確保閥桿零泄漏的設計。波紋管截止閥內部采用波紋管結構，不銹鋼的波紋管下端焊接在閥桿上，以防止工藝流體浸蝕閥桿。另一端置于閥體和閥蓋之間構成靜密封。采用雙重的密封設計若波紋管失效閥桿填料也會避免泄漏，波紋管焊于閥桿保持穩(wěn)定的運行性能，避免由于閥塞振動引起閥桿振動。更適用于蒸汽、易燃、易爆、導熱油、高純度、有毒等介質的管路上。
The bellows stop valve, also known as the bellows seal stop valve, forms a metal barrier between the fluid medium and the atmosphere through automatic roll welding to ensure the design of zero leakage of the valve rod. The inner part of the bellows stop valve adopts the bellows structure. The lower end of the stainless steel bellows is welded on the valve rod to prevent the process fluid from eroding the valve rod. The other end is placed between the valve body and the bonnet to form a static seal. The double sealing design can also avoid leakage if the bellows fails to work. The bellows is welded to the valve rod to maintain stable operation performance and avoid valve rod vibration caused by valve plug vibration. It is most suitable for pipelines with steam, flammable, explosive, heat transfer oil, high-purity, toxic and other media.
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