QCW series valveless type down-the-hole (DTH) pneumatic hammer features simple structure, excellent performance, reliable work, convenient maintenance and low air consumption.

　　Complicated air distributing mechanism in hammer is abolished and replaced by simple air distribution flue, which can reduce the air flue flow length, and accompanying with lowering loss of air pressure,in addition, it also utilizes the mechanical work converted from expanding compressed air helping the decrease of compressor capacity and weight, as well as energy consumption. These features assure that this series of hammer can be used at mountain area or poor transportation site.

　　QCW series hammers make highest drilling effectively under medium-high air pressure condition, as a result of full utilizing expansion work, although it is designed and manufactured for low pressure condition.