Operation Manual Piston Sensed Pressure Regulators
Audible venting is detected inside the regulator bonnet while increasing the delivery pressure
of the regulator by rotating the adjustment wheel clockwise.
1. Perform the following to increase the regulator delivery pressure set point.
a. Before opening the source valve, verify that the regulator adjustment wheel is turned fully
counterclockwise (fully decreased position).
b. Slowly open the source valve to pressurize the regulator high pressure port.
c. Rotate the regulator wheel clockwise to increase the delivery pressure to the desired pressure.
Note: The delivery pressure will decrease as the flow rate is increased. It may be
advantageous to compensate by adjusting the regulator to the desired delivery pressure while
operating at the desired flow conditions. Be aware the delivery pressure will rise if the flow
is shut-off or decreased downstream.
2. Perform the following to decrease the regulator delivery pressure set point for self-relieving
(self-venting) regulators.
a. Slowly rotate the regulator wheel counterclockwise to reduce the delivery pressure below the
desired pressure. The self-relieving feature will vent the delivery pressure through the
regulator bonnet to atmosphere.
b. Rotate the regulator wheel clockwise to increase the delivery pressure to the desired pressure.
Note: The delivery pressure will decrease as the flow rate is increased. It may be
advantageous to compensate by adjusting the regulator to the desired delivery pressure while
operating at the desired flow conditions. Be aware the delivery pressure will rise if the flow
is shut-off or decreased downstream.
3. Perform the following to fully decrease the regulator delivery pressure.
a. Close the source valve.
b. Vent outlet to atmospheric pressure.
c. Rotate the regulator wheel fully counterclockwise.
4. When necessary perform the following to adjust the vent valve. Refer to Figure 1.
a. Remove the closure (6) on the top of the regulator adjustment wheel (4).
b. Rotate the adjustment wheel clockwise to set the delivery pressure to approximately 10% of
regulator’s rated maximum outlet pressure or 200 psig whichever is greater, with all valves
downstream of the regulator closed.
c. Use a flat tip screwdriver to turn the vent screw (9) clockwise until gas can be heard venting
through the bonnet of the regulator.
d. Once venting is heard, turn the vent screw counterclockwise until audible gas flow stops plus
one half additional turn.
e. Replace the closure on the top of the adjustment wheel.
F. Preset Regulator Operation
Note: Preset regulators are adjusted at the factory to customer specified conditions. Generally, no
readjustment will be required.
1. Perform the following to readjust the regulator delivery pressure set point. Refer to Figure 1
a. Close the source valve.
b. Vent outlet to atmospheric pressure. This should vent both source and delivery pressures to
atmospheric pressure since the regulator is preset to some set point.
c. Remove acorn nut (8) from top of stem (2).
d. Loosen jam nut (7).
e. Place a 3/8 inch open end wrench on stem flats and rotate stem fully counterclockwise (fully
decreased position).
f. Slowly open the source valve to pressurize the regulator high pressure port to the desired
inlet pressure.
Page 6 of 9 Manual 15000011 Rev. 5
(13 pages)
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