• Page 2 of Valve Industry News
Selection Principles of Valve Bonnet Bolts’ and Gaskets’ Materials

Selection Principles of Valve Bonnet Bolts’ and Gaskets’ Materials

The general selection principles of valve bonnet bolts' materials are given as follows. 1. There is a tightening in hot condition process of pipe connection flange bolts when pipe connection flanges are in the beginning period of operation, but there is no need for the valve bonnet bolts to have the tightening in hot condition process. Therefore, the valve bonnet bolts wil...


Gate Valve Versus Globe Valve

Gate Valve Versus Globe Valve

1. Structure Gate valve is shorter and higher than globe valve, so it needs attention to install rising stem valve. In case of the limited space, people should note that what kind of valve is appropriate. Gate valve is able to close the sealing surface relied on medium pressure, thus it can achieve the effect of no leakage. When opening or closing valve, the spool and the sealing surface of s...


Soft Seal Ball Valve & Metal Hard Seal Ball Valve

Soft Seal Ball Valve & Metal Hard Seal Ball Valve

There are many kinds of ball valve used in different working condition according to different structure forms, connection methods and body materials. The seal form of all types of ball valve can be classified into two categories: soft seal and hard seal. Due to different sealing materials, their characteristics, performance and applicable working condition will also be different.   1. Speakin...


The Working Principle and Structural Characteristics of Ball Valve

The Working Principle and Structural Characteristics of Ball Valve

The valve's disc is a ball with hole and driven by stem to open and close the channel. The ball valve can be closed tightly by 90 degree rotation and small rotational torque. According to different needs of working conditions, different actuators can be assembled to form ball valves with a variety of control methods, such as electric ball valve, pneumatic ball valve, hydraulic ball valve,...