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13
Unit function
Handgun with pressure control and flow control (Servopress) with
low-effort version
1
Spray lance connection
2
High-pressure hose connection
3
Trigger
4
Retention force lever
5
Trigger play
6
Retention force spring
7
Handgun grip covers
8
Trigger position stop lever
9
Stop position in handgun grip
10
Adjusting wheel
11
Bolt
12
O-ring/support ring
13
Spindle
14
Trigger adjusting plate
15
Retaining screw for adjusting plate
16
O-ring/support ring
17
Threaded housing
18
Spring
19
Valve piston
20
Valve seat
With this type of handgun it is possible to control
the pressure and flow rate continuously, depen-
ding on how far the trigger (3) has been depres-
sed.
The distance that the trigger (3) can move is
limited by an adjustable stop lever (8) which can
be moved upwards or downwards by turning the
adjusting wheel (10).
The retention force lever (4) and spring (6) redu-
ce the retention force when the handgun is fully
opened.
When the trigger (3) is depressed, the valve
piston (19) is away from the valve seat (20) and
against the pressure of the spring (18) by the
spindle (13). This causes a gap to open up
between the valve piston (19) and the valve seat
(20). The further the valve is opened, the more
water can flow through.
The distance (5) by which the trigger (3) can be
moved is determined by the position of the trigger
adjusting plate (14).
If the adjusting wheel (10) is set to “0”, the trigger
(3) is locked in the closed position.
Markings on adjusting wheel
21
22
23
21
Handgun closed
22
Handgun partially opened
23
Handgun fully opened
Summary of Contents for HD 1090
Page 1: ...HD 1090 Service Handbook 0 I 5 905 212 03 02...
Page 4: ...2 Unit function Equipment 10 15 12 9 10 13 11 14 16 1 8 2 3 4 5 6 7 0 I...
Page 6: ...4 Unit function Functional diagram 5 3 7 8 9 10 11 12 13 14 2 1 15 16 17 4 6...
Page 8: ...6 Unit function Pump 15 17 18 10 12 13 11 14 16 20 9 12 11 1 8 2 3 4 5 6 7 11 19 21...
Page 10: ...8 Unit function Pressure and flow control with the Servopress handgun 1 2 4 3...
Page 14: ...12 Unit function Handgun with pressure and flow control Servopress with low effort version...