NSD Series High Air Pressure DTH Hammers Without Foot Valve

Main Features of NSD Series High Air Pressure DTH Hammers  Without Foot Valve

The high-pressure submerged hole impactor without nylon tube is a valveless high-pressure impactor designed by our company. It is one of the most advanced impactors in the world, and the pressure is 12-30 bar. 

1. Out of the trouble of foot valve fracture expansion and contraction.
2. Lower energy consumption and higher impact frequency. The drilling speed is 15%-30% higher than the one with foot valve.
3. Simple structure, reliable parts, long life span, easy and cheap maintenance.
4. The components are few, the structure is simple, and all the parts are hardened. Therefore, the working life is long, the failure is few, and the maintenance is convenient.
5. the joint box card brazing sleeve is threaded and connected with the outer cylinder, easy to disassemble.

According to the different bits of the drill, it is divided into the following series:

Specification of NSD Series High Air Pressure DTH Hammers  Without Foot Valve

NSD Series High Air Pressure DTH Hammers  Without Foot Valve
Item Description		Weight(kg)
		NSD4A		NSD5A		NSD6A		NSD8A		NSD10A		NSD12A
1、Top Sub		6.5		13.7		20		34		59		70
2、“O” Ring Of Top Sub		0.1		0.015		0.015		0.015		0.03		0.04
3、Breakout Ring		-		-		-		0.3		0.5		0.8
4、Chenck Valve		0.35		0.7		0.7		1.2		1.4		2
5、Spring		0.05		0.1		0.1		0.1		0.3		0.1
6、Air Distributor		1.5		2		3.5		6		10.5		16
7、Internal Cylinder		2.1		2.8		4.2		6.5		12.5		25
8、Piston		8.5		15		23		42.5		77		113
9、External Cylinder		15.3		24		28		59		110		175
10、Guided Sleeve		1.3		2.6		2.5		6		11.5		25
11、“O” Ring Of Stop Ring		0.005		0.01		0.01		0.01		0.01		0.01
12、Stop Ring		0.2		0.5		0.5		1.2		1.5		4.5
13、Breakout Ring		-		-		-		0.3		0.5		0.08
14、Drive Chuck		4		7.5		7.5		16		31.5		48
15、Drill Bit		9.8		16		27		37		108		165
Technical Data
Length(Without Bit)	NSD4A		NSD5A		NSD6A		NSD8A		NSD10A		NSD12A
	1012mm		1090mm		1011mm		986mm		1110mm		1110mm
Weight(Without Bit)	40.00kg		70.00kg		43.20kg		37.00kg		69.00kg		66.00kg
External Diameter	Ø99mm		Ø126mm		Ø146mm		Ø180/Ø185mm		Ø226mm		Ø275mm
Bit Shank	SD4		SD5		SD6		SD8		SD10		SD12
Hole Range	Ø110-Ø135mm		Ø155-Ø190mm		Ø155-Ø203mm		Ø195-Ø254mm		Ø254-Ø311mm		Ø305-Ø445mm
Connection Thread	API2 3”/8REG		API2 3”/8REG		API3 1”/2REG		API4 1”/2REG		AP6 5”/8REG		API6 5”/8REG
			API3 1”/2REG
			API2 7”/8REG
Working Pressure	1.2-2.0Mpa		1.3-2.3Mpa		1.5-2.5Mpa		1.5-3.0Mpa		2.0-3.5Mpa		2.0-3.5Mpa
Impact Rate at 17 Bar	30HZ		28HZ		25HZ		22HZ		20HZ		20HZ
Recommended Rotation Speed	25-40r/min		20-35r/min		20-30r/min		15-25r/min		15-25r/min		15-25r/min
									20-35r/min
Air Consumption	1.0Mpa:6.0m³/min		1.0Mpa:7.0m³/min		1.0Mpa:9.0m³/min		1.0Mpa:12.0m³/min		1.8Mpa:14.0m³/min		1.0Mpa:28.0m³/min
	1.8Mpa:9.0m³/min		1.8Mpa:14.0m³/min		1.8Mpa:18.0m³/min		1.8Mpa:22.0m³/min		2.4Mpa:65.0m³/min		1.8Mpa:50.0m³/min
	2.4Mpa:14.0m³/min		2.4Mpa:19.0m³/min		2.4Mpa:26.0m³/min		2.4Mpa:28.0m³/min				2.4Mpa:71.0m³/min