Parker Watts R374-02C Miniature Air Pressure Regulator, 1/4 in. NPT, 0 to 125 PSI
300 PSIG in, anything up to 125 PSIG out, in a body an inch and a half square. The R374 is the aluminum bodied miniature regulator from the Parker Watts general line, the one that goes on a machine panel or at a workstation where a full size regulator would be three times the part for no extra benefit.
Published specification
- Port size: 1/4 in. NPT, with two 1/8 in. gauge ports
- Maximum supply pressure: 300 PSIG
- Reduced pressure range: 0 to 125 PSIG
- Flow: 10 SCFM at 100 PSIG inlet, 75 PSIG set, 25 percent droop. Water service 1.25 GPM on non relieving builds
- Temperature: 40 F to 125 F
- Relieving as standard, unbalanced poppet, non rising adjusting knob
- Aluminum body, acetal spring cage, stainless bottom spring, 0.25 lb
- 1.56 x 1.56 x 2.56 in., 3.06 in. over the knob
Figures are from Parker catalog 0730-2, Parker Watts General Line FRL.
R374 or R364
Same regulator, different body metal. R374 is aluminum, R364 is brass. Choose the brass body where the ambient is corrosive or where a specification calls for it; otherwise the aluminum is lighter and cheaper and does the same job.
Relieving, and why it matters
This build is relieving, which means that if you dial the setting down while the downstream line is already pressurised, the excess bleeds out through the bonnet instead of staying trapped. That is what you want on a line feeding a cylinder or a clamp. If you are regulating into a closed vessel, or into anything where a small continuous bleed is unacceptable, specify the K option for non relieving instead.
Fitting
No gauge is supplied. Two 1/8 in. gauge ports are provided, one on each side, so the gauge can face whichever way the panel needs. Bracket kit SA161X57 includes the panel mount nut; the panel hole is 1.250 in. Install with the flow arrow pointing downstream and leave clearance for the knob.
Parker Watts R374-02C miniature relieving air pressure regulator, 1/4 in. NPT, 0 to 125 PSIG, 300 PSIG maximum inlet, aluminum body.
NOTE: Actual product may be different from pictured!
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