HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-44
Published 11-06-15, Control # 040-13
SHUTTLE VALVE MAINTENANCE
General
See Figure 2-44 for the following procedure.
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. 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.
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
FIGURE 2-44
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