Because the valve seat is composed of carbonized Teflon sealing ring and disc-shaped spring, it has strong adaptability to pressure and temperature changes, and does not produce any slip in the labeled pressure and temperature range.
全焊接球阀由于阀座是由碳化特氟隆密封环及碟形弹簧构成的，所以对压力和温度的变化适应能力强，在标注压力和温度范围内不会产生任何泄滑。
Because the valve body material is the same as the pipeline material, there will be uneven stress, and it will not be deformed due to earthquake and vehicle passing through the ground, and the pipeline is resistant to aging.
由于阀体材料跟管道材质一样,会出现应力不均,不会由于地震及车辆经过地面时而产生变形，管道耐老化。
The sealing ring body is made of PTFE with a content of 20%C(carbon) to ensure complete no leakage (0%).
密封环本体采用含量20%C(碳素)的PTFE材质，保障完全无泄漏(0%)。
All welded ball valve manufacturers to talk about the installation of all welded ball valve installation precautions.
由中球全焊接球阀厂家谈谈安装全焊接球阀安装注意事项。
1, the pressure test before installation, the pipeline valve should be tested before installation to ensure the tightness and safety of the valve itself.
1、安装前试压，管线阀门在安装前应进行压力试验，以确保阀门本身的严密性与安全性。
(1) Strength test.
(1)强度试验。
Water was used as the medium for strength test.
强度试验采用水作介质;
Weld high pressure on both sleeves of the valve - duh cap.
在阀门两侧袖管上焊接高压—咄帽.
After opening the valve to 45 degrees Celsius, water is injected into the ball valve through the pressure test valve on the sleeve.
将阀门开至45摄氏度位置后，通过袖管上的试压阀门向球阀内注入水.
Increase the pressure to 1.5 times the nominal pressure of the ball valve, and maintain the pressure for 15min;
升压至球阀公称压力的1.5倍，保压15min;
No leakage is qualified.
无泄漏为合格。
(2) Tightness test.
(2)严密性试验。
Nitrogen was used as the medium in the rigorous test.
严密睦试验采用氮气作介质;
Close the ball valve. Inject nitrogen into the ball valve from the pressure test valve on the sleeve.
将球阀关闭.从袖管上试压阀门向球阀内注入氮气.
The pressure rises to 1.1 times the nominal pressure of the ball valve, and the pressure relief valve in the middle chamber is connected to the hose through the water container for testing.
压力升至球阀公称压力的1.1倍，中腔放压阀接软管通人盛水容器进行检测.
The insertion depth is 1cm;
插入深度为1cm;
Qualified if no bubbles occur within 5 minutes.
5min内无气泡产生为合格。
2. Installation
2、安装
(1) Hoisting.
(1)吊装。
The valve should be hoisted in the correct manner. In order to protect the valve stem, do not attach the chain to the handwheel, gearbox or actuator.
应采用正确的方式吊装阀门，为了保护阀杆，不要将吊链系于手轮、齿轮箱或执行器。
Do not remove the protective caps at both ends of the valve sleeve before welding.
阀门袖管两端的保护帽在焊接之前不要摘除.
(2) The connection between the all-welded ball valve and the main pipeline shall be welded.
(2)全焊接球阀与主干管线的连接采取焊接.
Weld quality must be in line with the "disc bending fusion welding joint radiography" (GB3323-2005) class II plate standard, usually a welding can not fully guarantee all qualified, so when ordering the valve should require the manufacturer to add 1.0m long sleeve tube at both ends of the valve,
焊缝质量必须符合《盘屈熔化焊焊接接头射线照相》(GB3323—2005)Ⅱ级片标准，通常一次焊接并不能完全保证全部合格，所以订购阀门时候应当要求厂家在阀门两端增加1.0m长袖管，
Once the weld is not qualified and there is enough length to cut and re-weld the unqualified weld when the ball valve is welded with the pipeline, the valve should be in a fully open position to avoid the valve ball being damaged by the welding slag, while ensuring that the temperature of the internal seal of the valve does not exceed 140 degrees Celsius, and appropriate cooling measures can be taken if necessary.
一旦焊缝不合格还有足够的长度将不合格焊缝割除并重新焊接在球阀与管道焊接时，阀门应处于全开位置，以免阀球被飞溅的焊渣损坏，同时确保阀门内部密封件温度不超过140摄氏度，必要时可以采取适当的冷却措施.
(3) Valve shaft masonry.
(3)阀门井砌筑。
Special structural design, with the characteristics of maintenance-free, before burying in the outer side of the valve coated with Pu special anti-corrosion coating, at the same time, the three injection pipes respectively for the seat and the valve stem emergency grease, the cavity vent pipe and the valve stem according to the excellent depth of the appropriate extension, so that the staff can complete the operation on the ground.
采用特殊的结构设计，具有免维护的特点，埋地前在阀门外侧涂覆Pu特殊防腐涂层，同时将3根分别为阀座和阀杆紧急注脂的注入管，中腔放空管及阀杆根据煌地深度适当延长，以便工作人员在地面上就可以完成各项操作.
After the realization of direct burial, masonry small valve handwells can be built.
实现直埋地后，砌筑小型阀门手井即可。
For conventional non-fully welded ball valves, they can not be directly buried, and large valve Wells need to be built, which results in a dangerous confined space, which is not conducive to safe operation.
而对于常规非全焊接球阀则不可以直接埋地，并需砌筑大型阀门井，结果却形成了危险的密闭空间，不利于安全运营。
At the same time, the valve body itself and the bolt connection of the valve body and the pipeline will be corroded, affecting the service life of the valve.
同时阀体本身及阀体与管道的螺栓连接部位电会受到腐蚀，影响阀门的使用寿命。
