These three materials of stainless steel 304, 304H and 304L are often used in valve industry. Among three, 304 is the most common one, like SS304 ball valve, SS304 gate valve, SS304 globe valve, SS304 check valve we often see. In fact, according to the content of chromium and nickel, they all belong to stainless steel 304, since they all contains 18% chromium (Cr) and 8% nickel (Ni). The ma...

There are many ways to classify plug valves. In this article, we will introduce four main type of plug valves. 1. Lubricated Plug Valve A lubricated plug valve functions with the help of a lubricant (a base oil and viscosity improver) which is injected between the plug and body seat facing to reduce the frictions between them. The lubricated plug valve must be resealed after a few cycles. Due to i...

For trunnion-mounted ball valve, there is a metal seat ring and a soft seat insert to ensure the sealing performance of seat. The seat inserts are element mounted inside a metal seat ring and perform the same sealing functions as seat ring. There are mainly two types of seat insert materials, elastomeric and thermoplastic. Elastomeric seat insert is softer to achieve zero leakage of ball valve. Wh...

阀门执行器是用于操作和连接阀的装置。该装置可以由电源，空气压力，液压或其他组合的电源驱动，并且其运动过程可以由行程，扭矩或轴向推力控制。因为执行器工作特性和利用率取决于阀门类型，工作规格和位置......

To understand the difference between globe valve and stop check valve, we should first figure out what is a stop check valve. Stop check valve combines the functions of a general globe valve and check valve, which means besides isolating and regulating the flow rate, it can also prevent reverse flow. From the appearance, globe valve and stop check valve almost look the same. The main difference li...

Compared with other mechanical manufacturing processes, the valve manufacturing process has the following characteristics: A. The manufacture and inspection technology of valve rough is very complicated. The valve's casting blank is a thin-walled shell with complicated structure. Casting requires a smooth surface, casting characters clear, especially to have a dense structure, and do not allow the...