What are the advantages of positive-mounted and negative-mounted valve cores?

The difference between a direct-mount valve core and a reverse-mount valve core lies in their installation position. A direct-mount valve core is directly installed on the valve body, with the valve stem fixed inside. The movement of the valve core directly pushes the valve body, thus achieving the opening and closing of the valve. A reverse-mount valve core, on the other hand, places the valve core outside the valve stem, with the stem passing through the entire valve core. The valve core's opening and closing is achieved through the external movement of the valve stem.

 

Direct-mount valve core
Advantages: Direct-mount valve cores are simple to install, have a compact structure, strong leakage prevention capabilities, are more flexible in operation, have lower requirements for fluid pressure and temperature, and have a longer service life.

Reverse-mount valve core
Advantages: Reverse-mount valve cores have a simple structure and are easy to operate. When sealing the valve, there is no need to forcefully close the valve, and the requirements for the valve body material are lower, making them more suitable for special working conditions.