10
■EPDT-179c■
7.2 Adjustment
Read again 6.1 Diagram of piping example and 7.1 Warning and precaution on operation.
7.2.1 Pressure setting is not preset (the user does not require pressure presetting)
(1) Verify that stop valves V
1
, V
2
and V
3
are closed.
(2) Adjust the stop valve V
3
on the bypass pipe to an opening so that the primary pressure
regulating valve (or safety valve) will not be activated. Keeping the regulating (safety) valve
inactive, allow the fluid to pass through the piping to discharge foreign objects. After
completely expelling foreign objects, be sure to close the bypass stop valve V
3
.
(3) Remove the cap
○
35
and loosen the lock nut
○
33
.
Rotate the adjusting screw
○
34
(holding
across flat) CCW until the spring
○
29
becomes free from the load.
(4) Fine tune the opening of the stop valve V
2
so that minimum amount of fluid is allowed to
flow.
(5) Gradually open the inlet side stop valve V
1
.
(6) Observing the outlet pressure gauge, gradually adjust the adjusting screw
○
34
(holding
across flat) to obtain the desired pressure. (To increase the pressure, turn the screw
clockwise; to reduce the pressure, counterclockwise.)
(7) Gradually open the stop valve V
2
and readjust outlet pressure to obtain the desired value.
(8) After completing the adjustment, tighten the lock nut
○
33
and fit the cap
○
35
.
7.2.2 Pressure setting is preset (the user requires pressure presetting)
(1) Verify that stop valves V
1
, V
2
and V
3
are closed.
(2) Adjust the stop valve V
3
on the bypass line to an opening so that the primary pressure
regulating valve (or safety valve) will not be activated. Keeping the regulating (safety) valve
inactive, allow the fluid to pass through the piping to blow out foreign objects.
After completely expelling foreign objects, be sure to close the bypass stop valve V
3
.
(3) Adjust the opening of the stop valve V
2
so that minimum amount of fluid is allowed to flow.
(4) Observing the outlet pressure gauge, gradually increase the opening of the stop valve V
1
at
the inlet.
(5) Gradually increase the opening of the stop valve V
2
.
(6) If the reduced pressure is outside the desired value, remove the cap
○
35
and loosen the lock
nut
○
33
.
Observing the outlet pressure gauge, gradually turn the adjusting screw
○
34
(holding
across flat) to obtain the desired pressure. (To increase the pressure, turn the screw
clockwise; to reduce the pressure, counterclockwise.)
(7) After completing the adjustment, tighten the lock nut
○
33
and attach the cap
○
35
.
