HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-38
Published 07-19-16, Control # 249-01
SHUTTLE VALVE MAINTENANCE
General
See Figure 2-42 for the following.
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 three ports. When a pressure
differential of 0.07 bar (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.
Maintenance
By removing the screws (1) and washers (2), the body (3)
can be removed for easy replacement of the diaphragm (4)
without disturbing the 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 the diaphragm and gasket (5) if
they are damaged or worn. Reassemble the valve and check
for leaks during operation. No lubricant is required.
S117
1
P310
FIGURE 2-42
In
4
Out
In
5
2
3
Item Description
1 Screw (qty 4)
2 Washer (qty 4)
3Body
4 Diaphragm
5 Gasket
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