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6. Operating Procedure
6.1 Precautions for operation
Warning
(1) Do not touch the product with bare hands directly.
* Failure to follow this notice may result in scalds.
(2) Before applying steam to the product, confirm that there is no risk when steam flows into
the piping end and that piping joints are securely connected.
* Failure to follow this notice may result in scalds in case of steam blow out.
Caution
(1) Before leading fluid into the product, close the stop valves at the inlet and outlet of the
product and remove foreign substances and scale from the piping completely by using a
bypass line.
* Failure to follow this notice may prevent the product from functioning properly due to the
ingress of foreign substances and scale into the product.
(2) Adjust pressure of the bypass stop valve manually to prevent the outlet pressure from
going over the set pressure of the safety valve.
* If going over, the safety valve blows out.
(3) Before stopping operation of the product for an extended period, completely discharge fluid
from the product and close the stop valves at the inlet and outlet sides of the product.
* Failure to follow this notice may cause malfunction due to rusting inside the product and
the pipes.
6.2 Adjustment procedures
Follow the steps below, and slowly turn the adjusting screw to set pressure. Incorrect
adjustment may cause hunting, water hammer, etc., resulting in damage to the valve and other
equipment. (See "5.4 Example of piping".)
(1) Check that all stop valves (V
(2) Open the stop valve (V
(3) Open the stop valve (V
Taking enough time not to blow the safety valve, blow off the fluid to remove foreign
matter. After blowing, close the by-pass line glove valve.
(4) Set the operating air pressure to no pressure.
(5) Open the sensing pipe stop valve (V
(6) Open the stop valve (V
travel of the stop valve (V
(7) Confirm that the condensation is discharged from the inside of the pressure reducing
valve, and slowly open the stop valve (V
(8) While watching the pressure gauge on the secondary side, increase the operating air
pressure with a standard unit, etc., and adjust to the desired pressure. Be sure to release
a small amount of operating air pressure with a needle valve. (For the needle valve of
the standard unit, open the valve opening by 1/2 to 1 turn.)
(9) Slowly open the stop valve (V3) and make fine adjustments so that the secondary
pressure is the desired pressure.
(10) When the adjustment is completed, secure the handle of the standard control unit's
pressure reducing valve.
(11) Check for leakage. Conduct re-tightening as necessary.
to V
) are closed.
1
7
) for the trap installed before the pressure reducing valve.
6
) and adjust the valve travel of the by-pass line stop valve (V
3
).
4
) at the outlet side of the pressure reducing valve. Adjust the
2
) so that a little fluid flow.
3
) on the inlet side.
1
-14-
).
5
■EPDT-098a■
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