Table 20 Prv Size, Part Number And Spring Rating And Information - GE H301 Series Operating Manual

70 | Chapter 6: Lubrication
application
The Fulflo "V" Series valve (PRV) used on HSR compressors is .5", .75" or 1.0" female
national pipe thread (FNPT) and operates efficiently with compressor lubricating oil.
The PRV is made of a cast iron body with threaded FNPT inlet/outlet connections;
a hardened steel piston and an adjustable spring range of 30 Psi to 100 Psi (207 to
689 kpa) (see "Figure 14").
H 301/302 pressure regulating valve
part number
4W-PS-1284
Table 1 8 PRV size, part number and spring rating and information
installation
The PRV can be mounted in any position upstream of the oil cooler and filter. The
PRV relieves excess oil volume prior to filtration and bypasses oil to maintain
constant oil pressure. To minimize oil aeration, the PRV's outlet line is piped back to
the compressor frame sump below its minimum oil level.
Setting the Value
GE sets the initial PRV during its factory test run. The PRV utilizes a manually
adjusted, spring-loaded piston to control oil pressure throughout the compressor's
operating speed range. Since higher oil pressures occur during cold startups,
adjust the oil supply pressure during normal (hot) operation. An adjustment to the
PRV's spring-loaded piston regulates oil flow to the frame bearings by means of
observed oil pressure.
The Pre-startup checklist recommends field adjustment of PRV (if required) during
startup and normal compressor operations to maintain the compressor's oil
supply pressure within GE specifications. PRVs are not a positive shut-off valve, and
bypass a minimal amount of oil all the time.
To increase system pressure:
Turn the adjustment screw clockwise.
To decrease system pressure:
Turn the adjustment screw counter clockwise.
Reset the adjustment screw locknut to hold the pressure setting.
NPT size and spring rating
.75" FNPT, 30 - 100 Psi (207 to 689 kpa)
H O T O I L
DO NOT TOUCH.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (6)