Flow Chart B - +GF+ Neoflow Betriebsanleitung

NeoFlow pressure reducing valve
8.3

Flow chart B

Outlet pressure too low or too high.
Outlet pressure too high
Ratio of inlet and
outlet pressure
P1/P2 greater
than 4?
No
Turn the adjustment screw on
the pilot valve counterclockwise
and try to achieve the desired
outlet pressure (see chapter
„Setting outlet pressure P2")
Is the outlet pres-
sure P2 stable?
Yes
(set point +/- 0.1
Problem fixed
Turn speed control (SV)
anti-clockwise to the next
position and wait 30 se-
Is the outlet pres-
sure stable? (set
Yes
point +/- 0.1 bar)
Problem fixed
Network problems
REASONS:
- Valve piston blocked
- Casing body seal leaking
MEASURES:
-Insulate control chamber: Close CV at
approx. 4 bar pressure in the control cham-
ber. Isolate NeoFlow pressure reducing
valve (close shut-off valve on inlet side).
Release pressure at the control block sea-
ling plug opening
- Uninstall NeoFlow pressure reducing valve
and check for damage
Address your GF Piping Systems contact partner if occurring errors cannot be fixed.
40
Variant 1
No
Inlet pressure P1
too high
Yes
► Adapt design of
network
Yes
bar)
No
conds
1. Turn the speed control (SV) to
2. Monitor control chamber pressure
with pressure gauge at the control
block sealing plug opening
3. Adjust adjusting screw on pilot
valve by one full turn in any direction
No
Unscrew the adjustment screw
of the pilot valve counterclock
wise until the spring is relieved
(according to chapter „Setting
No
Is the
Inlet pressure
No
P1 unstable?
Yes
Inlet pressure P1
too low
► Adapt design of
network
Network problems
Is the outlet pres-
sure P2 stable?
(set point +/- 0.1
bar)
No
Is the specific flow
rate within the
No
planned operating
range?
Yes
position 6
Is the control
space pressure
No
responsive?
Yes
outlet pressure P2")
Does the flow
stop at the
Yes
outlet?
Instruction manual
Variant 2
Outlet pressure too low
Difference between
inlet pressure and
outlet pressure
No
P1-P2
≥ 1 bar?
Yes
Turn the adjustment screw on
the pilot valve clockwise and try
to achieve the desired outlet
pressure (see chapter „Setting
outlet pressure P2")
REASONS:
- Control system blocked
- Flow rate is outside the functional
range of the valve
MEASURES:
- Service control system, see chapter
"Service control system"
- Verify sizing of NeoFlow pressure
reducing valve
REASONS:
- Blockage in the pilot valve
- Leakage in the seal of the
valve piston
MEASURES:
- Clean control block filter
- Maintenance of the control
system
- Maintenance of the valve body