Product Description
The Characteristics Of High Air Pressure DTH Hammer
-with foot valve
It is a kind of valveless high air pressure DTH Hammer with foot valve
It has the following characteristics:
Valveless air distribution. More reliable.
Simple design of the piston, long life.
More efficient energy transfer,faster drilling speed,
lower air consumption and lower oil consumption.
Fewer internal parts, simple structure,longer life,
Less failure and easier to maintain because all the parts are heat treated.
Easy to disassemble because the top sub, the drive chuck and the
external cylinder are connected by multistep thread .
Explanation of High Air Pressure DTH Hammer
-With Foot Valve Code
Example One:MD55
M-Maxdrill(Our company name )
D-DHD Bit Shank
5-5"hammer
5-The Fifth Generation Hammer
Example Two:MQL4
M- Maxdrill(Our company name )
QL4-QL40 Bit Shank
| High Air Pressure with foot valve DTH Hammers |
| Item | Item Description | Weight(kg) | Part Number |
| 1 | Top Sub | 6.50 | MD3501 |
| 2 | "O"Ring of top Sub | 0.01 | MD3502 |
| 3 | Check Valve | 0.42 | MD3503 |
| 4 | Spring | 0.04 | MD3504 |
| 5 | Compression Buffer | 0.04 | MD3505 |
| 6 | Air Distributor | 2.20 | MD3506 |
| 7 | Internal Cylinder | 2.30 | MD3507 |
| 8 | Piston | 9.00 | MD3508 |
| 9 | External Cylinder | 15.60 | MD3509 |
| 10 | "O"Ring of stop Ring | 0.02 | MD3510 |
| 11 | Stop Ring | 0.20 | MD3511 |
| 12 | Drive Chuck | 4.00 | MD3512 |
| 13 | Drill bit |
| MD3513 |
Technical Data
| Length(less bit) | Weight(Less bit) | External Diameter | Bit Shank | Hole Range | Connection Thread |
| 1084mm | 40.5KG | 99MM | SD4 | 110-135 | API 2 3/8" REG |
| Working Pressure | Impact Rate At 1.5Mpa | Recommended Rotation Speed | Air Consumption |
| 145-350psi |
| 1.0-2.5Mpa | 28Hz | 25-40r/min | 200-600CFM |
