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Figure 2.5 Compressor Cylinder Head Unloaded
b. Unloaded Operation
Pressure from the discharge manifold (
passes through the strainer and bleed orifice to the
back of the bypass valve piston. Unless bled away, this
pressure would tend to close the piston against the
spring pressure and load the cylinders in that head.
With the solenoid valve energized the solenoid valve
stem will open the gas bypass port.
Discharge pressure will be bled to the suction manifold
through the opened gas bypass port. A reduction in
pressure on the bypass piston valve will take place
because the rate of bleed through the gas bypass port is
greater than the rate of bleed through the bleed orifice.
When the pressure behind the piston has been
reduced sufficiently, the valve spring will force the pis-
ton back, opening the gas bypass from the discharge
manifold to the suction manifold.
Discharge pressure in the discharge manifold will close
the discharge piston check valve assembly isolating
the compressor discharge manifold from the individual
cylinder bank manifold.
The unloaded cylinder bank will continue to operate
fully unloaded until the solenoid valve is de-energized
and the gas bypass port is closed.
Solenoid
Valve
Valve Stem
Gas Bypass Port
Spring Guide
Spring
Piston
Bypass Valve
Cylinder Discharge Valve
Suction
Manifold
Valve Plate
Cylinder Suction Valve
Bleed Orifice
Strainer
Discharge Manifold
Discharge Check
Valve Assembly
Summary of Contents for Transicold X4 7300
Page 21: ...62 11637 1 6 1 3 SAFETY DECALS ...
Page 22: ...1 7 62 11637 62 03958 ...
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Page 119: ...62 11637 SECTION 6 MESSAGECENTER PARAGRAPH NUMBER Page 6 1 MESSAGECENTER MESSAGES 6 1 ...
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