1.针型截止阀
1. Needle stop valve
是作为精确的流量控制用的。阀瓣通常于阀杆做成一体，它有一个与阀座配合、精度非常高的针妆头部。而且针型截止阀阀杆螺纹的螺距比一般普通截止阀的阀杆螺纹螺距要细。在通常情况下，昆山良工阀门针型截止阀阀座孔的尺寸比管道尺寸小。因此，它通常只限于在公称通径小的管线中适用，更多的用于取样阀。
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.直流式截止阀
2. DC stop valve
直流式截止阀的阀杆和通道成一定的角度，其阀座密封面与进出口通道也有一定的角度，阀体可制成整体式或分开式。阀体分开式截止阀用两阀体把阀座夹在中间， 便于维修。这类截止阀使流体几乎不改变流动方向，在截止阀中流阻更小。阀座和阀瓣密封面可堆焊硬质合金，使整个阀门更耐冲刷和腐蚀，非常符合于氧化铝生产工艺流程中的管路控制，同时也适合于有结焦和固体颗粒的管道中。
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.角式截止阀
3. Angle stop valve
角式截止阀的优点是可以把阀门安装在管路系统的拐角处，这样既节约了90°弯头，又便于操作。因此，这类阀门更适合在化肥厂的合成氨生产系统中和制冷 系统中采用。如J44H-160、J44H-320、L44H-160、L44H-320就完全是为合成氨生产系统而设计的。
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.钢球或瓷球密封截止阀
4. Steel ball or porcelain ball sealing stop valve
该阀的结构特点是阀体分为连体式和分体式，阀瓣为STL硬质合金钢球或为非晶材料经制粉成形、高温烧结、精研制成的瓷球。阀杆下端滚压包络球体在阀杆球孔 内，球体在阀杆的球孔内做三维转动时可产生无数条密封线，大大增加了密封面的使用寿命，还能保证可靠的密封。该阀由于受球体密封的限制，一般都用于较小的公称通经，约为6～25mm。该阀适用于核电厂、火电厂的高温高压蒸汽管路，取样、排污系统的仪表管路以及石化、化工系统中的耐温、耐压、耐磨损、耐腐蚀的管路上。
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.高温高压电站截止阀
5. High temperature and high pressure power station stop valve
该阀的结构特点是阀体与阀盖的连接均采用压力自紧密封式或夹箍式，阀体与管路的连接形式为对接焊连接，阀体材料多采用铬钼钢或铬钼钒钢，密封面大都堆焊硬质合金。因此，该类阀门耐高温高压，抗热性好；密封面耐磨损、耐擦伤、耐腐蚀，密封性能好，寿命长。更适用于火电工业系统、石油化工系统及冶金等的高温高压、蒸汽、油品、过热蒸汽的管路上。
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截止阀
6. API stop valve
该类截止阀严格参照ASMEB16.34标准进行设计；阀体与阀盖的连接、填料函、阀杆螺母的安装、上密封等均严格按照API600进行设计。阀门选材完全符合API600要求。结 构长度符合ASMEB16.10；法兰连接尺寸符合ANSI/ASMEB16.。阀门的检验与试验严格按照API598进行。因此，该阀广泛适用石油化工管路，在电力、冶金、纺织等系统也适用。
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.. 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.氧气管路用截止阀
7. Stop valve for oxygen pipeline
该阀严格按氧气管路的要求进行设计。填料箱部分严格密封，外界污物不能进入填料箱内。阀体两端法兰有接地装置，在管路上安装完毕后，应接地，严防静电起火。本阀门的壳体材料为奥氏体不锈钢或铜材，导电好、不易发生静电起火。密封到材料为聚四氟乙烯对阀体本体材料，为软密封，密封性能好，气体检验泄漏量为零。本阀门在组装前严格经四氯化碳脱脂处理，没有油脂和污物，不致引起静电起火。该阀适用于冶金系统的氧气管路，在其他行业的氧气管路上也适用。
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.石油液化气截止阀
8. LPG stop valve
该阀专为石油液化气的管路或装置设计。结构上注意了防火要求。填料采用聚四氟乙烯，密封可靠、物外漏。密封副材料采用聚四氟乙烯或尼龙对阀体本体材料，为软密封，密封可靠。该阀适用于液化石油气管路系统，作为启闭装置，也适用于其他温度≤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.上螺纹阀杆截止阀
9. Upper threaded stem stop valve
该类截止阀的阀杆不与工作介质直接接触。根据壳体材料、密封副材料、填料材料、阀杆材料不同，适用于不同的工况。若阀体、阀盖材料为碳素钢，密封副材料为合金钢，填料为柔性石墨，阀杆材料为Cr13系不锈钢，适用于水、蒸汽、油品管路；若阀体和阀盖材料为1Cr18Ni9或0Cr18Ni9，密封副材料为阀体本身材料或硬质合金，填料为聚四氟乙烯，阀杆材料为Cr17Ni2，适用于以xiao酸为基的腐蚀性介质管路或装置上；若阀体阀盖材料为1Cr18Ni12Mo2Ti或0Cr18Ni12Mo2Ti，密封副材料为阀体本身材料或硬质合金，填料为聚四氟乙烯，阀杆材料为1Cr18Ni12Mo2Ti，适用于以醋酸为主的腐蚀性介质管路或装置上。不过该类截止阀的公称通经为200mm，200以上的截止阀要设旁通阀或 设计上设置内旁通结构。一般，DN≥200mm的截止阀的进口端都在阀瓣的上方，即高进低出，这是为了防止关闭时太费力和阀杆过粗的缘故。
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.下螺纹阀杆截止阀
10. Lower threaded stem stop valve
该类截止阀阿的阀杆螺纹直接与工作介质接触，直接受介质的侵蚀，使阀杆螺纹易锈蚀、造成启闭费力。此种结构的截止阀其公称通经都比较小，一般在6～50mm之间，大部分用在仪表阀和取样阀。
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锻钢截止阀
11. API602 forged steel stop valve
该类截止阀按石油协会标准API602进行设计，阀体和阀盖碳钢或不锈钢锻造而成，阀体和阀盖连接有螺栓连接、螺纹连接加焊接，有上螺纹阀杆和下螺纹 阀杆之分，密封副材料为Cr13钢、不锈钢酸钢对STL硬质合金，填料为柔性石墨或聚四氟乙烯，连接方式有法兰、螺纹、承插焊和对接焊，压力等级为CL150～CL1500，公称通经为1/4～2in。广泛地应用于石油化工、电力、化工等部门地装置和管路上，工作介质为蒸汽、油品，腐蚀性介质。结构 长度按ASMEB16.10，法兰连接尺寸按ASME/ANSIB16.，焊端尺寸符合ASMEB16.25，承插焊孔尺寸符合ANSIB16.11，螺纹连接端尺寸符合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., 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.柱塞截止阀
12. Plunger stop valve
该类柱塞阀属径向密封，由套在磨光柱塞上地两个弹性密封圈来实现。两个弹性密封圈用一个套环隔离开，并通过阀体与阀盖地连接螺栓施加在阀盖上地载荷把柱塞 周围地弹性密封圈压牢，保证密封。该阀地材料组合为壳体用碳钢，柱塞用Cr13不锈钢，密封圈用柔性石墨，可用于水、蒸汽、油品地管路；若壳体用不锈耐酸 钢，柱塞用不锈耐酸钢，密封圈用聚四氟乙烯，适用于酸、碱类腐蚀性介质。该阀地优点是密封可靠，寿命比较长，维修简便；缺点是启闭速度慢。该类阀门广泛应 用于城建系统，城市供热中的水、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.波纹管截止阀
13. Bellows stop valve
波纹管截止阀也叫波纹管密封截止阀，通过自动滚焊焊接，在流体介质和大气之间形成一个金属屏障，确保阀杆零泄漏的设计。波纹管截止阀内部采用波纹管结构，不锈钢的波纹管下端焊接在阀杆上，以防止工艺流体浸蚀阀杆。另一端置于阀体和阀盖之间构成静密封。采用双重的密封设计若波纹管失效阀杆填料也会避免泄漏，波纹管焊于阀杆保持稳定的运行性能，避免由于阀塞振动引起阀杆振动。更适用于蒸汽、易燃、易爆、导热油、高纯度、有毒等介质的管路上。
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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