Manitowoc 3900W - Adjustment; General; Maintenance

© 1996 Manitowoc Engineering Co.
Rev. 06-14-96 Folio 503-1
SHUTTLE VALVE
SERVICE INFORMATION
General
The shuttle valve automatically selects the higher pressure from one or the other of
two controlling devices and directs the flow of air to a common outlet. The valve
serves to connect two segregated lines to a common line without destroying the
segregation.
Operation
The shuttle valve has 3 ports as shown in the illustration. When a pressure
differential of 1 psi or more exists between either IN port, the higher pressure
forces the diaphragm to seal the opposite port of the valve and air flows out the
common OUT port. The low pressure IN port is sealed from both the OUT port
and the opposite side IN port.
Adjustment
The shuttle valve does not require adjustment.
Maintenance
By removing screws (1) and washers (2), body (3) can be removed for easy
replacement of diaphragm (4) without disturbing piping connections.
When complete disassembly is required, wash all metal parts with a nonflammable
solvent. Wash all rubber parts with soap and water. Rinse thoroughly and blow dry
with a low-pressure air jet. Replace diaphragm (4) and gasket (5) if damaged or
worn. Reassemble the valve and check for leaks during operation. No lubricant is
required.
S117
In
Out
4 Diaphragm
In
1
2
5
P310
3
395143