Adjustment - TLV DR20 Manuel D'utilisation

6. Adjustment

Follow the below procedures for adjusting DR20/A-DR20. Especially if the DR20 pressure
reducing valve is installed in a steam system, it should be properly adjusted for protection of the
steam using equipment against water hammer.
1. It is necessary to blow down all pipe lines thoroughly.
The blowdown is especially important if the line is new or has been shut down for a long
period of time. Take particular care to ensure that matter such as condensate and dirt does
not remain inside the equipment.
(Stay clear of any pressurized blow-out from the safety valve.)
2. Make sure that the shut-off and bypass valves located upstream and downstream of the
DR20/A-DR20 are completely closed.
3. Loosen the locknut, then turn the adjustment handle counter-clockwise to free the coil spring.
4. Slowly, fully open the shut-off valve at the inlet of the DR20/A-DR20.
5. Slightly open the shut-off valve at the outlet of the DR20/A-DR20.
6. Turn the adjustment handle clockwise until the desired outlet pressure is obtained. Wait
several minutes.
7. Slowly, fully open the shut-off valve at the outlet of the DR20/A-DR20.
8. After setting, retighten the locknut.
9. When shutting down the system, always close the outlet shut-off valve first and then the inlet
valve.
Loosen the locknut
Clockwise
Increase Pressure
Raise the
adjustment handle
Counterclockwise
Decrease Pressure
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