Sterlco SPV Remote Proportioning Devices - Manual (Page 23)

Remote Proportioning Valve Chapter 5: Troubleshooting 23 of 28
Problem Possible cause Solution
Faulty compressed air
connection to valve. Repair connection/replace
connector. Must have
minimum 60 psi.
Inadequate incoming vacuum
signal and voltage. Locate problem, repair/ replace
as needed.
Loose connection wiring in
control box. Repair/replace as needed.
Compare voltage rating of
solenoids in shroud to output
voltage of controls.
Control is on and working, but
valve does not work.
Improper shroud solenoid
voltage compared to control
output voltage.
Check solenoids in shroud and
replace as needed.
Check supply voltage. Inadequate voltage.
Make sure the unit has power.
Control does not work.
Loose control wiring in control
box. Repair as needed.
Control malfunction. Repair as needed.
Valve jammed with material. Clean out valve.
Inadequate air pressure. Correct as needed. Minimum
60 psi required for operation.
Worn plungers. Replace plungers (Part No.
W00533565).
Clogged filter hopper. Clean or replace filter.
Excessive vacuum leaks/ loose
connections to valve. Repair/replace as needed.
Sudden loss in conveying rate.
Possible loss of up to
20% conveying rate compared to
non- proportioning unit.
Worn cover seal. Repair/replace as needed.
Inadequate air pressure. Correct as needed. Minimum
60 psi required for operation.
Inadequate lubrication of air
cylinder. Lubricate air cylinder.
Solenoids are malfunctioning. Repair/replace as needed.
Worn/malfunctioning plungers. Repair/replace plungers as
needed.
Replace air cylinder.
Plungers move slowly, stick, or
do not seal properly.
Sticking plungers.
Consult factory.