Maintenance - Thermo Scientific CRYO Plus 1 Operating And Maintenance Manual

Thermo Scientific

Maintenance

Section 4
Valve maintenance is described below.
Warning These procedures must be performed by qualified service
technicians. ▲
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 slide entire solenoid enclosure from
solenoid base sub-assembly.
Caution When metal retaining clip disengages, it springs upward.
2. Unscrew solenoid base sub-assembly and remove body gasket, core
assembly with rider ring and core spring attached.
▲
7007400 Cryoplus 4-1