Overview
The Parker R119-03B is a standard pneumatic air pressure regulator designed for reliable pressure regulation in industrial air preparation systems. This unit features 3/8″ NPT female threaded inlet and outlet ports, making it a direct replacement for existing installations using 3/8″ piping. The regulator delivers 0–125 PSIG outlet pressure with a maximum supply pressure rating of 300 PSIG, accommodating a wide range of pneumatic applications from light duty to moderate industrial loads.
Key Features
- Diaphragm-operated design with balanced poppet mechanism for quick response and accurate pressure regulation
- 3/8″ NPT female threaded ports for standard industrial piping connections
- Outlet pressure range: 0–125 PSIG (0–9 BAR)
- Maximum supply pressure: 300 PSIG (21 BAR)
- Rated flow capacity: 51.9 L/s (110 SCFM)
- Rugged zinc housing with stainless steel internals for durability
- Buna-N seals and brass inner valve for corrosion resistance
- Secondary aspiration with balanced poppet provides stable, consistent pressure maintenance
Technical Specifications
- Port Size: 3/8″ NPT female threaded inlet/outlet
- Outlet Pressure Range: 0–125 PSIG (0–9 BAR)
- Maximum Supply Pressure: 300 PSIG (21 BAR)
- Rated Flow: 51.9 L/s (110 SCFM) at 100 PSIG inlet, 75 PSIG outlet, 20 PSIG drop
- Operating Temperature: 40°F to 125°F (4.4°C to 52°C)
- Weight: 1.8 lb (0.82 kg)
- Housing Material: Zinc with zinc spring cage
- Valve Body: Brass inner valve
- Seals: Buna-N (nitrile)
- Bottom Plug: Nylon
- Regulation Type: Relieving
Typical Applications
- General industrial pneumatic systems requiring consistent outlet pressure
- Compressor air preparation in manufacturing and assembly lines
- Plant air distribution networks and point-of-use pressure regulation
- Tool and equipment stations requiring stable 0–125 PSIG supply
- FRL (Filter-Regulator-Lubricator) installations in machine shops and production facilities
- Pneumatic control circuits in automation and process equipment
Compatibility & Replacements
Compatible With
- All standard 3/8″ NPT pneumatic piping systems and compressed air networks
- Industrial compressed air preparations compliant with ISO 8573 air quality standards
- Parker and third-party filters, lubricators, and FRL manifold assemblies
- Standard air dryer and moisture separator systems
- Pneumatic actuators and control valve circuits rated to 125 PSIG
Replaces / Drop-In Replacement For
- Parker R119-03B (all suffix variants including -B, -C, -CG)
- Watts Fluid Air R119-03 series regulators
- Other 3/8″ NPT standard regulators in the same pressure class
Works With
- Parker Hannifin air preparation products and pneumatic networks
- Standard ISO 4400 and ISO 4401 ported manifold systems
- Compressed air quality monitoring and measurement instruments
- Flow meters and pressure transducers rated to 300 PSIG supply
