Operation
4325−1/A1
Winterthur Gas & Diesel Ltd.
1/ 2
Starting Air Shut-off Valve
1. General
The starting air shut-off valve (shut-off valve) stops or releases the starting air to the
engine. You use the handwheel (3, Fig. 1) to put the shut-off valve in the positions
that follow:
D CLOSED
D AUTOMAT
D OPENED.
When the engine is in stand-by mode or during operation, the shut-off valve is in the
AUTOMAT position. The lever (14) holds the shut-off valve in this position.
To do a test of the shut-off valve, you must operate the ball valve 35−8353_E0_2 (see
step 1).
1) Operate the ball valve 35−8353_E0_2 to make sure that the valve (5) opens. The
shut-off valve opens, which you can hear clearly, but the engine will not start.
2) When the engine is not in operation, do step a) to step e).
a) Close the shut-off valves 930-V03 and 930-V04 on the starting air bottles
(plant).
b) Push the lever (14) down, then use the handwheel (3) to move the shut-off valve
to the position CLOSED.
c) Open the vent valve to release the pressure in the shut-off valve and air supply
pipes.
d) Open the vent valve to release the pressure in the starting air supply pipes.
e) Engage the turning gear.
After each maneuvering period, open the vent valves in the supply pipe to drain the
condensate water (see also 8018−1 Starting Air Diagram).
For more data, see the Control Diagram 4003−2.
2. Function
2.1 Ready to Start
Starting air flows through the inlet pipe (IP) into the inlet chamber (8), then through
the balance bore (6) into the space (9). The spring (4) and the pressure in the space
(9) keep the valve (5) closed.
2.2 Start Sequence
The related CCM−20 module operates the solenoid valve (11) or (13) (see also
4002−1, paragraph 3 Engine-related control functions).
The control air (CA) opens the control valve (1) through the solenoid valve
CV7014C (11) and releases the pressure in the space (9). The valve (5) opens and
starting air from the inlet chamber (8) flows through the non-return valve (7) into the
starting air supply pipe (SA).
2.3 End of Start Sequence
When the control valve (1) closes, starting air flows through the balance bores (6) and
fills the the inlet chamber (8) again. The valve (5) closes.
2.4 Function Check
When the control valve operates on the ready-to-start engine, the pressure in the
space (9) is released. You can hear the valve (5) as it opens.
2015-03
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