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Model 78 Air Filter Regulators
Product Description
The Model 78 Series pressure regulators are compact, lightweight,
high-performance pressure reducing instruments. They are used
primarily for supplying a stable source of air to process control
equipment such as current to pneumatic transducers and control
valve positioners.
Numbering System
Model No.
Pressure Range
5-40 psi (35-280
78-4
kPa), (0.35-2.8 bar)
5-100 psi (35-700
78-40
kPa), (0.35-7 bar)
Specifications
210 psi (1.5 MPa, 15 bar)
Inlet Pressure Rating
maximum
5-40 psi (35-280 kPa, 0.35-2.8
Pressure Set Range
bar)5-100 psi (35-700 kPa, 0.35-7
bar)
Connection
1/4 NPT
Rated Cv
0.25
Filter Element
Sintered Porous Polyethylene (5μ)
Ambient Temperature
-40° to +83°C (-40° to +182°F)
Range
Air Consumption
0.004 scfm (100 sccm)
Weight
14 oz. (0.4 kg)
Materials of
See table next page
Construction
WARNING
Do not install this Regulator in air lines which exceed 210 psi
(1.5 MPa, 15 bar) pressure.
Installation
CAUTION
Clean the lines thoroughly to remove all dirt, scale or other foreign
matter before installing the regulator. Install with flow in direction
of flow arrows on regulator body. The airset should be installed
with the drain cock facing down. Regulator should be installed
as close as possible to device utilizing the reduced pressure to
CAUTION
minimize pressure drop. Do not use piping or tubing smaller than
the regulator connections since this will restrict flow and reduce
capacity.
It is recommended that pressure gauges be installed on the inlet
and outlet sides of the regulator as an aid in adjusting the pressure
and in monitoring of working pressures.
4 | GE Oil & Gas
Operation
Prior to applying supply pressure, loosen knob lock screw and turn
pressure set knob counterclockwise. Turn on supply pressure.
Output pressure should be zero. Slowly rotate set knob clockwise
until desired pressure is reached. Tighten knob locking screw to
ensure that pressure remains set at desired value. When changing
output from a higher to lower pres¬sure, initially go to lower than
desired pressure, then increase to desired pressure. Re-tighten
knob lock-screw.
Description
Maintenance
Air Loading with
Relief and Filter
It is recommended that the drain cock be opened at regular
intervals to drain any fluid that may have collected in the dripwell.
Air Loading with
The interval between draining will have to be determined based on
Relief and Filter
the actual rate of accumulation of fluid.
It is recommended that pressure gauges be installed on the inlet
and outlet sides of the regulator as an aid in adjusting the pressure
and in monitoring of working pressures.
The relief valve feature should not be confused with any
auxiliary safety valve which might be needed for complete
protection of air operated equipment. It is intended only
to provide more uniform controlled pressure and to permit
adjusting the outlet pressure downward without venting the
line.
Prior to performing maintenance on the regulator, shut off the
inlet and outlet pressures and remove the spring compression
by turning the setting knob fully counterclockwise. Open
the drain cock carefully to relieve any retained pressure and
drain the dripwell. It is recommended that the regulator be
removed from the line for repairs.
When draining the dripwell, open the drain cock slowly and
collect the fluid in a suitable container for safe disposal.
Note:
• Considering the high labor costs involved in replacing internal
• Care must be taken to avoid damage to the plug and stem
WARNING
CAUTION
WARNING
WARNING
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
parts, it may be more economical to stock complete units.
DANGER
assembly.
DANGER
DANGER
© 2017 General Electric Company. All rights reserved.
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