Operation
4325−1/A1
Winterthur Gas & Diesel Ltd.
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Starting Air Shut-off Valve
1. General
For more data, see the Control Diagram in 4003−2).
The starting air shut-off valve (shut-off valve) stops or releases the starting air into the
engine (see Fig. 1). You use the handwheel (5) to put the shut-off valve in the
positions that follow:
D CLOSED (closed manually)
D AUTOMAT
D OPENED (manually).
When the engine is in stand-by mode or during operation, the lever (6) holds the
shut-off valve in the AUTOMAT position.
To do a test of the shut-off valve, do as follows:
1) Operate the valve 2.06 to make sure the valve (1) opens. When the shut-off valve
is ready to open, the valve (1) opens, which you can clearly hear, however the
engine will not start.
After each maneuvering period, open the venting valve 2.27 in the starting air supply
pipe to drain the condensate water (for more data, see 8018−1 Starting Air Diagram).
2. Function
2.1 Ready to Start
Starting air flows through the air inlet pipe (AP) into the air inlet chamber (AI), then
through the balance bore (BB) into the space (VS). The spring (3) and the pressure in
the space (VS) keep the valve (1) closed.
2.2 Start Sequence
The related FCM−20 operates the common start valve (8) or (11) (see also 4002−1,
paragraph 3 Engine-related control functions).
The control air (CA) opens the control valve (7) through the common start valve (11)
and releases the pressure in the space (VS). The valve (1) opens and starting air
from the air inlet chamber (AI) flows through the valve body (2) into the starting air
supply pipe (SA).
2.3 End of Start Sequence
When the control valve (7) closes, starting air flows through the balance bores (BB)
and fills the the space (VS) again. The valve (1) closes.
2.4 Function Check
When the control valve operates on the ready-to-start engine, the pressure in the
space (VS) is released. You can hear the valve (1) as it opens.
2017−08
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