Manitowoc 2250 Service Maintenance Manual

Reference Only
HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-34
Published 07-19-16, Control # 249-01
QUICK RELEASE VALVE MAINTENANCE
General
See Figure 2-39 for the following.
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 a 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 it is damaged or worn. Reassemble the valve and
check for leaks during operation. No lubrication is required.
Operation
See Figure 2-40 for the following.
The quick release valve has three 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
FIGURE 2-39
Quick Release Valve
S113
S114
FIGURE 2-40
Cover
Diaphragm
Out
Exhaust
In
Body
Valve Closed
Valve Open
Cover
Diaphragm
In
BodyExhaust
Out

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English