Product Overview

A-4000 Series Oil Removal and Pressure-Reducing Stations and Air Compressor Accessories Product
Bulletin
3
Remote-Mounted 3/8 in. Pressure-Reducing Station
The A-4000-138 Remote-Mounted 3/8 in. Pressure-Reducing Station (see Figure 7) comes completely assembled
with a wall mounting bracket, 0 to 30 psig gauge, safety relief valve, and 3/8 in. O.D. compression elbow fittings on
the high- and low-pressure sides. The desired output pressure can be easily adjusted between 0 and 30 psig using
the black knob. The factory-set safety relief valve relieves overpressures exceeding 25 psig (175 kPa). Pressure
adjustments up to 50 psig (350 kPa) can be made; however, the 0 to 30 psig gauge must be replaced with one
having a higher scale, and the safety relief valve must be readjusted to the required higher value. Designed to
handle input pressures up to 300 psig (2,100 kPa) at air flows exceeding 20 scfm (9.4 l/s), this pressure-reducing
station regulates an output pressure within a 0.2 psi (1.4 kPa) variation with a 20 psi (140 kPa) variation in input
pressure.
Table 3: Repair Parts
Description Code Number
1/4 in. NPT, 25 psig Safety Relief Valve (Not ASME Coded) A-4000-144
Replacement Bracket A-4000-143
Figure 7: A-4000-138 Remote-Mounted
3/8 in. Pressure-Reducing Station
Figure 8: A-4000-138 Dimensions, in./mm
Figure 9: A-4000-144 Safety
Relief Valve
Figure 10: A-4000-143 Mounting Bracket
Dimensions, in./mm