Yoshitake PD-1, Руководство пользователя

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12
12
-16
Air Operated V
alve/Contr
ol V
alve
Air Operated Valve/Control Valve – Annex
XX
CT-1
Trouble Cause Remedy
Warning
Be sure to install safety device for such as blocking or opening when failure or
malfunction of solenoid valve may violate human life, body, or property.
Please refer to the manual attached to the product for procedures for installation and operation. CAUTION
Troubleshooting Control valve
The product
does not
operate.
Operation
is unstable
(Hunting occurs).
Leakage from
plug.
Leakage from
gland packing
and bonnet
gasket.
Pilot pressure or external signal is not supplied. .... Check existence of pilot pressure (0.35 MPa or
more) by device such as pressure gauge. Check
existence of external signal by device such as tester.
Air supply piping is clogged or leaks. ............... In case of clogging, clean air supply piping. In
case of leakage, replace the piping.
Diaphragm bolt is loosened. ............................. Retighten diaphragm bolt.
Leakage occurs between lower diaphragm ...... Replace actuator.
case and diaphragm rod.
Failure occurs in accessory positioner or .......... Inspect or replace positioner or regulator.
regulator.
Failure occurs in body part or actuator. ............ Inspect or replace body part or actuator.
Sensitivity of positioner is not appropriate. ....... Replace positioner.
Abnormal signal is sent from controller. ............ Regulate controller and check signal system.
Pilot pressure is not stable. ............................... Check air supply piping and replace it with one of
larger nominal size.
Valve does not descend to the position of ........ Readjust zero point by controller.
full close.
There is damage on plug or seat ring. ............... Replace body part.
Gland nut or bonnet nut is loosened. ................ Retighten the nut. In case the leakage is still
found, replace packing.
Hardening of gland packing or bonnet gasket. .... Replace gland packing or bonnet gasket.

Recommended torque for actuator
To install actuator set on body, tighten so that appropriate
pressure can be applied on gasket
3 , with torque wrench.
In this case, use tightening torque as follows.
Nominal Size Tightening torque
15A 60Nm
20A 90Nm
25A 120Nm
32A 150Nm
40A 190Nm
50A 230Nm