It is a valve that is mainly used between Chamber and Chamber and withstand reverse pressure. 

The principle of operation is that the air cylinder moves the plate inside the valve to the sealing part with the Frist Stage using the Two Stage method

 and then the plate goes up obliquely to seal with the Second Stage. 

 To increase the life time, bearing and plate were subjected to special heat treatment. 

 It mainly produces 2" x 6" to 14" sizes and can produce Max 150mm x 1000mm with Customer Order Made.