4'' COP44 / DHD 340 / QL 40 Shank Down The Hole Air Pressure Hammer for Hard Rock Drilling
 
Introduction
It is a kind of valveless high air pressure DTH hammer with foot valve.
The rock hammer has the fellow advantages
1: Valveless air distribution. more reliable.
2. The rock impacter are simple design of the piston, long life.
3. More efficient energy transfter,faster drilling speed, lower air consumption and lower oil consumption.
4. Fewer internal parts, simple structure, long life, 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 multi-step thread.
 
Hammer shank available:
1. BR shank series: BR1, BR2, BR3;
2. Cop shank series: Cop32, Cop34, Cop44, Cop54, Cop64, Cop84;
3. DHD shank series: DHD3.5, DHD340,DHD350, DHD360, DHD380;
4. SD shank series: SD4, SD5, SD6, SD8, SD10, SD12, SD15, SD18;
5. Mission shank series: Mission40, Mission50, Mission 60, Mission 80;
6. QL shank series: QL30, QL40, QL50, QL60, QL80;
7. NUMA shank series: NUMA120, NUMA125, NUMA180, NUMA240;
Other hammer shanks can be available according to customer's drawing or samples.
Technical Parameters of High air pressure DTH hammer with foot valve
Specification

	Item Description	Weight	Parts No.
	1.Top Sub	6.5	HD4501
	2.O-Ring of Top Sub	0.01	HD4502
	3.Check Valve	0.42	HD4503
	4.Spring	0.04	HD4504
	5.Compression Buffer	0.04	HD4505
	6.Air Distributor	2.2	HD4506
	7.Internal Cylinder	2.3	HD4507
	8.Piston	9	HD4508
	9.External Cylinder	15	HD4509
	10.O-Ring of stop ring	0.01	HD4510
	11.Stop Ring	0.2	HD4511
	12.Drive Chuck	3.5	HD4512
	13.Drill Bit	9	HD4513
According to customer's requirement,the top sub can be made into two spanners,and put protection buttons,An air controllinghole can be drilled on the check valve to provide more efficient cuttings discharge.

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