Hitachi NT65MA3 Instruction Manual - Page 14

Operation Principle, As a result, the Head Valve Spring

Page 14 highlights

8-3. Operation Principle (1) Before nailing: (Fig. 5 and Fig. 6) 1) When compressed air is fed to the main body, it fills Exhaust Cover [5] Exhaust vent Head valve chamber the accumulator ( ). Head Valve Spring [8] 2) At the same time, the compressed air flows into the valve piston lower chamber of the control valve Head Valve (A) [10] Air passage Control valve section section and forces Valve Piston (B) [65] upward. Also, the compressed air is fed through the air supply vent and air passage to the head valve chamber. As a result, the Head Valve Spring [8] is Accumulator Piston [15] Cylinder [11] Trigger (A) [53] pushed down together to seal Head Valve (A) [10] Return air chamber and Cylinder [11]. (2) When nailing: (Fig. 5 and Fig. 6) 1) When Pushing Lever (A) [40] and Trigger (A) [53] are operated together and Plunger (A) [68] is Pushing Lever (A) [40] pushed upward, the compressed air in the valve Nail piston lower chamber is discharged from the bottom of Plunger (A) [68]. As a result, the compressed air Fig. 5 in the accumulator ( ) pushes down Valve Piston (B) [65], blocking the air supply vent and opening the exhaust valve. 2) When the exhaust valve opens, the compressed air in the head valve chamber is discharged into the To the head valve chamber Accumulator Air passage Air supply vent atmosphere through the air passage. 3) When the air pressure applied on the bottom surface of Head Valve (A) [10] overcomes the strength of the Head Valve Spring [8], Head Valve (A) [10] is pushed upward. At this time, Head Valve (A) [10] seals with the Exhaust Cover [5], blocking the passage to the exhaust vent. 4) When Head Valve (A) [10] goes up, the compressed air in the accumulator flows rapidly into the Cylinder Plunger (A) [68] Exhaust valve Valve Piston (B) [65] Valve piston lower chamber [11], forcing the Piston [15] downward to strike the nail. When the Piston [15] passes the cylinder hole, Fig. 6 Control valve section the compressed air flows into the return air chamber and is accumulated there. --- 11 ---

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--- 11 ---
8-3. Operation Principle
(1) Before nailing: (Fig. 5 and Fig. 6)
1) When compressed air is fed to the main body, it fills
the accumulator (
).
2) At the same time, the compressed air flows into the
valve piston lower chamber of the control valve
section and forces Valve Piston (B)
[65]
upward.
Also, the compressed air is fed through the air
supply vent and air passage to the head valve
chamber.
As a result, the Head Valve Spring
[8]
is
pushed down together to seal Head Valve (A)
[10]
and Cylinder
[11]
.
(2) When nailing: (Fig. 5 and Fig. 6)
1) When Pushing Lever (A)
[40]
and Trigger (A)
[53]
are operated together and Plunger (A)
[68]
is
pushed upward, the compressed air in the valve
piston lower chamber is discharged from the bottom
of Plunger (A)
[68]
.
As a result, the compressed air
in the accumulator (
) pushes down Valve Piston
(B)
[65]
, blocking the air supply vent and opening the
exhaust valve.
2) When the exhaust valve opens, the compressed air
in the head valve chamber is discharged into the
atmosphere through the air passage.
3) When the air pressure applied on the bottom surface
of Head Valve (A)
[10]
overcomes the strength of the
Head Valve Spring
[8]
, Head Valve (A)
[10]
is
pushed upward.
At this time, Head Valve (A)
[10]
seals with the Exhaust Cover
[5]
, blocking the
passage to the exhaust vent.
4) When Head Valve (A)
[10]
goes up, the compressed
air in the accumulator flows rapidly into the Cylinder
[11]
, forcing the Piston
[15]
downward to strike the
nail.
When the Piston
[15]
passes the cylinder hole,
the compressed air flows into the return air chamber
and is accumulated there.
Fig. 5
Fig. 6
Control valve section
Exhaust Cover
[5]
Exhaust vent
Head Valve
Spring
[8]
Head
Valve (A)
[10]
Accumulator
Piston
[15]
Cylinder
[11]
Return air
chamber
Pushing Lever (A)
[40]
Nail
Trigger (A)
[53]
Control valve
section
Air passage
Head valve chamber
To the head valve chamber
Air supply vent
Accumulator
Air passage
Exhaust valve
Valve piston
lower chamber
Plunger (A)
[68]
Valve Piston (B)
[65]