This is a kind of high air pressure DTH hammer to fit DTH bits without air tubes (foot valve). It is quite popular in Chinese market these years.
It has the characteristics as below:
1. Since no air tube is needed, the DTH bit is out of the trouble of air tube fracture, expansion or contraction.
2. It has lower energy consumption and higher impact frequency. The drilling speed is 15%-30% higher than it with an air tube.
3. Simple structure, reliable parts, long service life, easy to maintain with lower maintenance charge.
4. Lower air and oil consumption. The oil consumption is about 10% lower than the one with air tube.
You can find the DTH hammer bit model QL50-152 by clicking the link:
https://www.worldrill.com/dth-bit-for-5-inch-dth-hammer.html
