APTech SL 5800 - Manual (Page 4)

Operation Manual Pressure Regulators
Manual 15000006 Rev 6 Page 4 of 4
c. In order to obtain a specific set point under flowing conditions, continue to rotate the
wheel counterclockwise to reduce the delivery pressure below the desired set point. Then,
rotate the wheel clockwise to increase the delivery pressure to obtain the set point at the
desired flow condition.
3. Perform the following to close the regulator.
a. Close the source valve.
b. Vent to atmospheric pressure on both sides of the pressure regulator.
c. Rotate the wheel fully counterclockwise.
F. Pneumatically Actuated Regulator Operation (PA models)
Note: A pressure regulator should not be used as a positive shut-off device.
Caution: Do not vent or otherwise reduce the actuation control pressure under non-flowing
conditions as damage to the regulator internal parts or leakage may result.
Caution: Do not pressurize the regulator outlet except by slowly increasing the actuation control
pressure 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 actuation control pressure is at
atmospheric pressure.
b. Slowly open the source valve to pressurize the regulator high pressure port.
c. Slowly increase the actuation control pressure 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 flow.
b. Slowly reduce the actuation control pressure to reduce the delivery pressure.
c. In order to obtain a specific set point under flowing conditions, continue to decrease the
actuation control pressure to reduce the delivery pressure below the desired set point.
Then, increase the actuation control pressure to increase the delivery pressure and obtain
the set point at the desired flow condition.
3. Perform the following to close the regulator.
a. Close the source valve.
b. Vent to atmospheric pressure on both sides of the pressure regulator.
c. Vent or otherwise reduce the actuation control pressure to atmospheric pressure.
Please contact the factory or your local representative to answer questions or for further
information.