It is a kind of valveless high air pressure DTH hammer with foot valve.
 Features :
1. Valveless air distribution. More reliable.
2. Simple design of the piston. Long life span.
3. More efficient energy transfer. faster drilling speed. lower air consumption and lower oil consumption.
4. Fewer internal parts, simple structure, long life span, less failure and easier to maintain because all the parts are heat treated
5. Easy to disassemble because the top sub, the drive chuck and the external cylinder are connected by multiple steps thread.