HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-40
Published 11-06-15, Control # 040-13
QUICK RELEASE VALVE MAINTENANCE
General
See Figure 2-41 for the following procedure.
The quick release valve shortens the time required to vent air
pressure from a cylinder or other pneumatic device. This is
made possible by exhausting the air pressure directly to
atmosphere at the quick release valve instead of back
through the control valve.
Adjustment
The quick release valve does not require adjustment.
Maintenance
By removing the screws and washers, the cover can be
removed for easy replacement of the diaphragm without
disturbing the piping connections.
When complete disassembly is required, wash all metal
parts with nonflammable solvent. Wash all rubber parts with
soap and water. Rinse all parts thoroughly and blow dry with
a low-pressure air jet. Replace the diaphragm and the gasket
if damaged or worn. Reassemble the valve and check for
leaks during operation. No lubrication is required.
Operation
See Figure 2-42 for the following procedure.
The quick release valve has 3 ports. Air pressure entering
the in port forces the diaphragm to seal the exhaust port and
open a direct passage between the in and out (cylinder)
ports.
When air pressure at the in port is reduced and pressure is
slightly greater at the out port, the diaphragm is forced
against the in port. With the in port sealed off, a direct
passage is opened between the out and exhaust ports,
allowing the operated device to vent quickly.
P309
Quick Release Valve
FIGURE 2-41
Diaphragm
Cover
Out
In
BodyExhaust
Valve Closed
Valve Open
BodyExhaust
In
Diaphragm
Cover
Out
S113
S114
FIGURE 2-42
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