DTH hammers designed for DTH bits with foot vavle  V.S  DTH hammers designed for DTH bits without foot valve

DTH drill bits and hammers use compressed air to generate impact energy, driving the drill bit to perform drilling operations. The DTH hammer contains a precise air distribution system consisting of an air distributor , internal cylinder, piston, and piston case. Its working principle involves entering compressed air into the DTH hammer, causing the piston to reciprocate within this system, converting air energy into mechanical energy, and ultimately transmitting it to the drill bit to break the rock.

1.  DTH Hammers for DTH Bits with Foot Valve:

Blow tube, plastic tube, tube, foot valve, all refer to the same item.

Regular DTH product series with foot valve include:

DHD series: DHD3.5, DHD340, DHD350, DHD360, DHD380

QL series: QL40, QL50, QL60, QL80

SD series: SD4, SD5, SD6, SD8

COP series: COP34, COP44, COP54, COP64, COP84

In these DTH hammers, the foot valve works in conjunction with the piston based on a sealing principle, acting as a valve within the hammer to control air distribution. Typically, these DTH hammers have a heavier and shorter piston with more space in their air distribution system. This configuration allows for a lower impact frequency yet greater force per impact under the same air pressure, making them suitable for very hard rock formation. 

Additional advantages of DTH hammers for DTH bits with foot valve include:

1.   Airflow Control:  

The foot valve adjusts the flow of compressed air entering the hammer. As the piston moves down, it allows air into the hammer, thus forming a high-pressure zone. This high-pressure air is then released through the drill bit, producing the necessary impact force to break rock.

2.   Pressure Maintenance:

The foot valve helps maintain the necessary pressure inside the hammer. Proper pressure control ensures efficient operation of the hammer and provides the required impact energy to the drill bit. It also prevents pressure overloads, which can damage equipment or reduce drilling efficiency.

3.   Directional Control:

In some DTH hammers, the foot valve also acts as a directional control. It directs airflow to different parts of the hammer, allowing the piston to move and ensuring the correct transference of impact energy to the drill bit.

2.  DTH Hammers for DTH Bits without Foot Valve:

Regular DTH product series without foot valve include:

Mission series: Mission 30, Mission40, Mission 50, Mission 60, Mission 80.

COP series: COP32, COP42, COP52, COP62.

BR series: BR2, BR3, BR4.

DHD-N series, improved series based on DHD : DHD2.5N, DHD3.5N, DHD340N, DHD350N, DHD360N, DHD380N.

QL-N series, improved series based on QL : QL50N, QL60N, QL80N.

In these hammers, the smaller lower end of the piston interacts with a guide sleeve, taking on the role of the foot valve. Unlike the DTH hammers with a foot valve, these have a longer piston and a more compact air distribution system, resulting in a shorter piston stroke, faster impact frequency, and less force per impact. Therefore, non- foot valve DTH hammers are more suited to soft or medium soft rock formation .

Additional advantages of DTH hammers for DTH bits without foot valve include:

1.   High drilling speeds, the drilling speed is 15%-30% higher than the one with foot valve.

2.   Out of issues due to foot valve breakage, damage, and thermal expansion and contraction.

3.   Lower air Consumption, reduced fuel consumption: over 10% savings compared to DTH hammers with foot valves.

4.   Simpler internal structure, lower overall failure rate, less frequent dismantling, reduced downtime for clients.

Clients should choose the most suitable DTH product series based on the rock conditions they need to drill, and can also consult the Sinodrills sales team in advance.

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