172-65613A-03 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 11 Jun 2020
11
Adjustment
Use only under conditions in which no water hammer will occur. The
impact of water hammer may damage the product, leading to fluid
discharge, which may cause burns or other injury.
CAUTION
To avoid problems such as water hammer and to protect steam-using equipment,
the DR8 should be correctly adjusted.
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 steam-using 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 DR8 are completely closed.
3. Remove the cap and loosen the locknut, then turn the adjustment screw
counterclockwise to free the coil spring.
4. Slowly, fully open the shut-off valve at the inlet of the DR8.
5. Slightly open the shut-off valve at the outlet of the DR8.
6. Turn the adjustment screw clockwise until the desired outlet pressure is
obtained. Wait several minutes.
Clockwise
Counter-
clockwise
Increase Pressure
Decrease Pressure
7. Slowly, fully open the shut-off valve at the outlet of the DR8.
8. After setting, hold the adjustment screw and retighten the locknut.
9. When shutting down the system, always close the outlet shut-off valve first and
then the inlet valve. (If the inlet shut-off valve is closed first, the safety valve
may be tripped.)
