D. preset regulator operation, A. close the source valve, C. remove the acorn nut from the stem – APTech SL 5800 User Manual
Page 3: D. if present on the stem, loosen any hex nuts, F. close the downstream valve
Operation Manual
Pressure Regulators
Manual 15000006 Rev 6
Page 3 of 4
D. Preset Regulator Operation
Note: Preset regulators are adjusted at the factory to deliver a specified delivery pressure at a
specified supply pressure at zero flow conditions. Instructions to adjust the preset outlet pressure
can be found below.
1. Perform the following to adjust the regulator delivery pressure set point
a.
Close the source valve.
b.
Open a downstream valve to vent the inlet and outlet side of the pressure regulator to
atmospheric pressure.
c.
Remove the acorn nut from the stem.
d.
If present on the stem, loosen any hex nuts.
e.
Using a hex wrench, rotate the stem fully counterclockwise to close the regulator.
f.
Close the downstream valve.
g.
Slowly open the source valve to pressurize the regulator high pressure port.
h.
Using a hex wrench, rotate the stem clockwise to increase the delivery pressure to the
desired set point.
Note: The delivery pressure will decrease as the flow rate is increased. In order to obtain
a specific delivery pressure at flow, adjust the regulator to the desired delivery pressure
while operating at the desired flow conditions. Be aware the delivery pressure will rise
when the flow is shut-off or decreased downstream.
i.
If present on the stem, tighten the bottom hex nut to 75 in-lb. If there is a second hex nut
on the stem, tighten it against the bottom hex nut.
j.
Thread the acorn nut onto the stem and tighten against the hex nut (or cap if there are no
hex nuts on the stem).
E. Manually Adjustable Regulator Operation (non-PA models)
Note: A pressure regulator should not be used as a positive shut-off device.
Caution: Do not rotate the wheel counterclockwise under non-flowing conditions as damage to
the regulator internal parts or leakage may result.
Caution: Do not pressurize the regulator outlet except by rotating the adjustment wheel
clockwise as damage to the regulator internal parts or leakage may result.
1. Perform the following to open the regulator or increase the regulator delivery pressure set
point.
a.
Before opening the source valve, verify that the regulator adjustment wheel is turned fully
counterclockwise (closed position).
b.
Slowly open the source valve to pressurize the regulator high pressure port.
c.
Rotate the wheel clockwise to increase the delivery pressure to the desired set point.
Note: The delivery pressure will decrease as the flow rate is increased. In order to obtain
a specific delivery pressure at flow, adjust the regulator to the desired delivery pressure
while operating at the desired flow conditions. Be aware the delivery pressure will rise
when the flow is shut-off or decreased downstream.
2. Perform the following to decrease the regulator delivery pressure set point.
a.
Open a downstream valve to initiate a flowing condition.
b.
Slowly rotate the wheel counterclockwise to reduce the delivery pressure.