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7000740r7 Cryo Series 3-1
Thermo Scientific
Section 3
Maintenance
Solenoid valve maintenance information follows.
Operation
Normally closed: Valve is closed when solenoid is de-energized, valve is
open when solenoid is energized.
Positioning/Mounting
The valve is designed to perform properly when mounted in any posi-
tion. However, for optimum life and performance, the solenoid should
be mounted upright, to reduce the possibility of foreign matter accumu-
lating in the core tube area.
Maintenance
Warning
Turn OFF electrical power supply and de-pressurize valve before
making repairs. It is not necessary to remove valve from pipe line for
repairs.
▲
Cleaning
A periodic cleaning of all solenoid valves(s) is desirable. The time
between cleanings will vary, depending upon media and service condi-
tions. Generally, if the voltage to the coil is correct, sluggish valve opera-
tion, excessive noise, or leakage will indicate that cleaning is required.
Valve Disassembly And Reassembly
De-pressurize valve and turn OFF electrical power supply. Proceed in the
following manner:
1. Remove retaining clip and slip entire solenoid enclosure off
solenoid base sub-assembly.
Caution
Retaining clip springs upward when disengaged.
▲
2. Unscrew solenoid base sub-assembly and remove body gasket, core
assembly with rider ring and core spring attached.
3. Clean and reassemble in reverse order of disassembly, paying careful
attention to exploded view provided for identification and
placement of parts.
After maintenance, operate the valve a few times to ensure proper opening
and closing.
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