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SPECIAL EQUIPMENT - GENERAL, SPECIFICATIONS (2)Pressure Governor Cornpressed air from pressure
Adjusting spring
To air compressor unloader ..
Low pressure valve
Valve body· Diaphragm Filter
From air tank
B4080A
The pressure governor controls compressor opera tion to keep the air tank pressure within specified limits. To the high pressure valve of the diaphragm, the same air pressure as in the air tank acts always through the filter, thereby balancing with the adjust ing spring force. When the pressure in the air tank
B4815A
increases to exceed that opening pressure of the high pressure valve, the air forces up the high pressure
The unloader valve, operating with the pressure
valve seat of the diaphragm. This causes increase of
governor, controls pressure in the air tank. When the air pressure in the air tank exceeds the specified pressure (pressure governor operating pressure), the
acting area so that the diaphragm moves up quickly to close the seat of the low pressure valve. When the low pressure valve is closed, air now flows
pressure governor opens to send the compressed air
through the valve body to force down the unloader
to the unloader valve. The compressed air not only
valve of the air compressor, thereby stopping air
depresses the unloader valve, but keeps the suction
supply to the air tank.
valve open, causing the air compressor to operate
As the air pressure in the air tank gradually drops, the
under no load.
diaphragm is forced down by the adjusting spring
When the air pressure in the air tank falls below
and the low pressure valve opens and the high
specification, the pressure governor resumes opera
pressure one closes. As a result, the air on the
tion, discharging compressed air present at top of the unloader. Then the unloader valve spring puts the
unloader side is exhausted through the exhaust hole and air supply to the air tank is resumed.
unloader valve back to its original position, causing the suction valve to begin operation.
2. SPECIFICATIONS Item
Specification
Air Compressor Type Cylinder diameter x stroke Cylinder capacity Turning direction (as viewed from drive side)
mm cc
Water-cooled 1-cylinder type
Water-cooled 2-cylinder type
85 X 50
80 X 50
284
502
Clockwise
Clockwise
Pressure governor Type
61-4
Diaphragm type