Material selection for the valve body of the gas valve

According to the working pressure of the gas pipeline, reasonably select the valve body material, which can not only meet the safe operation of the pipeline, but also achieve the purpose of reducing the cost and making the best use of it.

1. For medium-pressure B-grade (0.2MPa) transmission and distribution pipelines, it is recommended to use gray cast iron valves. The biggest advantage is that it has good corrosion resistance and is cheap, which is very suitable for underground pipelines;

2. For medium-pressure A-grade (0.4MPa) transmission and distribution pipelines, or even high pressure grade B (0.8MPa) or less, it is recommended to use ductile iron or cast steel valves, in particular, ductile iron one is preferable. For example, the ductile iron grade QT400--18 is comparable to the cast steel grade WCB. The former has the same mechanical properties as the latter, while the corrosion resistance and casting process of ductile iron are superior to those of cast steel, and the price is lower than that of cast steel (The price of ductile iron is generally about 70% of that of cast steel). Therefore, the overall performance and price of the ductile iron valve are superior to those of the cast steel valve. Use ductile iron valves as much as possible within the above pressure range, but special attention should be paid to the quality control of ductile iron materials;

3. In the high-pressure A-class (1.6MPa) or higher pressure level, it is recommended to use cast steel valves. For the manufacture of valves below 4MPa pressure level, WCB grades are generally used;

4. In recent years, local gas companies have begun to use PE pipes, which are currently used below 0.4MPa pressure level.
PE ball valves have also been released, and the series of ball valves can be directly buried and have good sealing performance. However, the current price of PE ball valves is relatively high, especially the ball valves with a diameter larger than 100 mm.
Three-way Cast Steel Plug Valve
NO.2013 Valves catalog download
View and download valve product literature, sales brochures and more.
News & Events
Working Principle of Butterfly Valve
Butterfly valve is a kind of valve that is opened and closed according to the rotation of the valve stem to drive the disc to rotate. In the cylindrical passage of the valve body, the disc is rot...
Reasons and Solutions for Valve Hard to Fully Close
In the process of using the valve, there are often some perplexing problems. For instance, the valve can't be tightly closed. So how should do? If the valve is not tightly closed, first find out ...
Notes on Selection of Valves
Selection of valves shall comply with the following principals: 1. According to the use place and purpose of the valve, and after knowing the relevant regulations, specifications, standards and gaini...
What is Butterfly Check Valve?
The check valve belongs to an automatic valve, and its main function is to prevent back flow of medium, reverse rotation of pump and drive motor, and relieving of container medium. Check ...
? 皇家贝蒂斯主帅 股票配资门户联系方式 巴西甲级联赛积分 qq麻将手机版官方 北京龙跃股票配资加盟 福彩东方6十1生肖开奖结果 股票涨跌影响总资产 网络兼职赚钱项目 3d开机号进100 七星*论坛 22选5选号 白城麻将攻略 什么股票配资平台靠谱 无限金币版捕鱼 大唐麻将微信群推倒胡 中国女子足球超级联 至尊棋牌最新版