Yamatake ACTIVAL VY51X2J, Specifications & Instructions

Page: 13 / 16

13 AB-6465
Inspection and Maintenance
CAUTION
•
Avoid touching the installed ACTIVAL (valve
body, yoke, joint). When being used to
control hot water, it reaches high tempera-
ture and may cause burn injury.
1) Inspection
Inspect the ACTIVAL according to Table 1.
Manually open/close the ACTIVAL at least once a
month if it is left in inactive state for a long period.
2) Maintenance
Visually inspect the fluid leakage of the valve and the
actuator operations every six months. If any of the
problems described in Table 2 are found, take
corresponding actions shown in the table.
Table 1. Inspection items and details
Inspection item Inspection interval Inspection detail
Visual inspection Semiannual • Fluid leakage from the gland and the flange face
• Loosened bolts
• Valve and actuator damages
Operating status Semiannual
•
Unstable open/close operation
•
Abnormal noise and vibration
Routine inspection Any time
•
Fluid leakage to the outside
•
Abnormal noise and vibration
•
Unstable open/close operation
• Valve hunting
Table 2. Troubleshooting
(If your problem is not solved by the corresponding action, please contact Yamatake near you.)
Problem Part to check Action
•
Fluid leaks from the flange face. Loosened flange bolts
Gasket on the flange face
Misaligned piping Tighten the flange bolts.
Replace the gasket.
Redo piping.
•
Fluid leaks from the gland part. Loosened gland packing Tighten the gland nut.
•
Fluid leaks from the bonnet. Loosened bolts Tighten the bolts.
•
Valve does not operate smoothly /
valve stops halfway /
valve does not operate at all.
Conditions of the power applied and of the
input signal applied
Loosened terminals
Wiring condition / disconnected wires Check the power supply and the controller
connected to.
Tighten the terminals.
Check the wiring.
•
Fluid leaks to the outside of the
valve when the ACTIVAL is in fully
closed position.
Actuator pointer not pointing to fully closed
position Fully close the ACTIVAL.
•
The valve vibrates or produces an
abnormal noise.
Primary pressure condition
Differential pressure condition Adjust the mounting position and installation
location.
•
The auxiliary switch does not
operate.
Auxiliary switch (cam switch) condition
Loosened terminals
Wiring condition / disconnected wires Redo the cam switch setting.
Tighten the terminals.
Check the wiring.
• The auxiliary potentiometer does
not operate.
Condition of resistance
Loosened terminals
Wiring condition / disconnected wires Check the resistance value (1 k Ω ).
Tighten the terminals.
Check the wiring.
• Valve hunting occurs. Secondary pressure condition
Differential pressure condition Adjust the mounting position and installation
location.
Correct the control parameter setting of
controller.