Valco electronic Valve Oven ユーザーズマニュアル

Chapter 4
Troubleshooting

Refer to the TRACE operations manual, Chapter 4, Gases and Controls, for leak 
test suggestions and the necessary hardware required to pressure check a 
plumbing system. 

Valco valves contain a rotor that is turned by the actuator. This rotor channels the 
gas between the various ports of the valve. If the rotor is not being switched 
properly, a flow path may be partially or fully blocked, or leaks may occur 
between valve ports. 

Each valve contains a mechanical stop that should reach an extreme when the 
valve is rotated in the clockwise or counterclockwise direction. Close inspection 
of the valve will indicate if the valve is being switched to its limits, Figure 2-4. 
Actuator pressure should be 420 Kpa (60psig) to 630 Kpa (90 psig). 

Table 4-1. Leak Testing for Valves

Valve leaking between ports

Defective rotor

Replace rotor or valve

Valve leaking around rotor

Valve rotor not seating 
properly
Rotor Defective

Tighten rotor

Replace Rotor in valve

Leaking out valve ports

Ferrule not seating

Replace ferrule

Table 4-2. Causes and Remedies for Improper Valve Switching

Low actuator line pressure

Increase line pressure

Solenoid not actuating

Verify timed event is set correctly
Check voltage at solenoid 
Replace defective solenoid