MAIN LIQUID LINE
SOLENOID VA LV E S
The Sporlan Main Liquid Line Solenoid Va l v e
goes into differential mode when the coil is de-
e n e r gized or fails. When the Pilot Port ➀ o p e n s ,
Upstream pressure ➁ fills the Main Va l v e
Chamber ➂ and forces the Main Valve towards
a closed position. The downstream pressure ➃
falls to the point that the Pilot Valve Spring ➄
can not keep the downstream outlet closed. T h e
Main Valve Chamber starts to empty and
upstream pressure forces the main valve
towards open.
Differential Mode Quick Test
1. Connect pressure gauges up- and down-
stream of the valve.
2. All branches on the rack must be in
refrigeration mode.
3. Disconnect power to Solenoid.
4. Check gauges for differential.
NOTE: Low refrigerant demand may prevent
the differential from building up to the valve's
real setting.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
CONTROL VALVES Revised August 1, 1996
7 - 4
Downstream pressure
+ pilot spring pressure
= upstream pressure.
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