Flowgrid Regulator | 11
WARNING
The instruction manual for the PILOT(S) being used
should be consulted to ensure that the installation and
start up instructions for the pilot are followed. Some
pilots can be damaged if not installed and put into
operation correctly.
Pressure Reducing Regulator
1. Adjust the pilot restrictor to an intermediate opening
(a “4” setting on the Mooney Type 24 Restrictor).
2. Back off on the pilot adjusting screw to fully relieve all the
spring compression.
3. If installed, open hand valve(s) in the control line(s), and
the pilot supply line.
4. Crack open downstream block valve or open vent in
piping downstream of the Flowgrid
®
valve.
5. Slowly open the upstream block valve to pressurize the
Flowgrid
®
valve and pilot system. The Flowgrid
®
valve
should lock up (shut off) with zero pressure downstream.
6. Use vent in the downstream piping or slowly open the
outlet block valves.
7. Slowly increase the pilot spring setting until some flow is
achieved through vent or into downstream system. Adjust
the pilot restrictor for stability and performance as follows:
a. If the system is stable, adjust the pilot
restrictor to a more closed position (towards
MIN setting). Change the flow rate or increase
the pilot setting to check the operation of the
system during an upset.
b. If the system is stable, repeat step (a) until the
system is unstable (oscillating).
c. Now readjust the restriction to a more open
position (towards MAX setting) where the
system is stable.
d. Vary the flow rate over as wide a range as
possible to make sure the system will be
stable under all flow conditions.
NOTE: Adjustment of the restrictor affects the response
rate, stability, and sensitivity of the regulator. CLOSING
the pilot restrictor (moving adjustment towards MIN
setting) will result in higher gain (narrow the proportional
band), more sensitivity, and slower closing speeds.
OPENING the pilot restrictor (moving the adjustment
towards MAX setting) will result in less gain (widen the
proportional band), less sensitivity, and faster closing
speeds.
8. Slowly increase the pilot spring setting until the desired
downstream pressure is achieved.
9. Slowly close the downstream block valve or vent to check
the Flowgrid
®
valve for lockup (shut off).
10. Slowly open the downstream block valve.
Back Pressure Regulator or Relief Valve
1. Adjust the pilot restrictor to an intermediate opening
(a “4” setting on the Mooney Type 24 Restrictor).
2. Increase pilot spring compression to maximum or some
margin above desired setting.
3. If installed, open hand valves(s) in the control line(s), and
the pilot supply line.
4. Check that the Flowgrid
®
valve is vented to atmosphere or
the downstream system is ready to accept flow.
5. Open the downstream block valve or open vent in piping
downstream of the Flowgrid
®
valve.
6. Slowly crack open the upstream block valve to pressurize
the Flowgrid
®
valve and pilot system.
The Flowgrid
®
valve should lock up (shut off) with zero
pressure downstream.
7. Slowly decrease the pilot spring setting until some flow is
achieved. The flow may only be through the pilot system.
8. Adjust the pilot restrictor for stability and performance as
follows:
a. If the system is stable, adjust the pilot restrictor to
a more closed position (towards MIN setting).
Change the flow rate or increase the pilot setting to
check the operation of the system during an upset.
b. If the system is stable, repeat step (a) until the
system is unstable (oscillating).
c. Now readjust the restriction to a more open
position (towards MAX setting) where the
system is stable.
d. Vary the flow rate over as wide a range as
possible to make sure the system will be stable
under all flow conditions.
NOTE: Adjustment of the restrictor affects the response
rate, stability, and sensitivity of the regulator.
CLOSING the pilot restrictor (moving adjustment towards MIN
setting) will result in higher gain (narrow the proportional band),
more sensitivity, and slower closing speeds. OPENING the
pilot restrictor (moving the adjustment towards MAX setting)
will result in less gain (widen the proportional band), less
sensitivity, and faster closing speeds.
9. Slowly adjust the pilot spring setting until the desired
upstream pressure (relief setting) is achieved.
Start Up and Operation
The following procedures are suggested for start up of the
Flowgrid
®
valve/regulator. Start up of the Flowgrid
®
valve/
regulator should be made by qualified personnel familiar with
high pressure systems and pilot operated regulators.
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