Watts R119-04J Air Reg

The Watts R119-04J is a high-performance 1/2" NPT air pressure regulator engineered for industrial-grade pneumatics requiring a compressed air pilot-operated configuration. Built with a rugged zinc body and a balanced poppet design, this unit maintains a consistent downstream pressure even amidst fluctuating inlet supplies up to a 300 PSIG maximum. As a relieving type regulator, it utilizes a Buna-N diaphragm and O-rings to ensure quick response and high flow rates, peaking at 150 SCFM. This specific model is adjusted via pilot signal to manage a 5-7 PSI range, making it a critical component for precision control in refrigeration, instrumentation, and power systems. Technical pros appreciate the secondary aspiration, which provides superior stability under wide flow variations. These Parker-Watts R119 series units are optimized for heavy-duty service where accurate secondary pressure and reliable pneumatic pilot control are non-negotiable for system integrity.

• High Flow Performance: Rated for 150 SCFM to accommodate demanding air preparation and instrumentation workflows.
• Superior Pressure Stability: The balanced poppet design minimizes the "supply pressure effect," preventing downstream fluctuations.
• Quick Response: Diaphragm-operated secondary aspiration ensures the regulator reacts instantly to downstream demand changes.
• Rugged Construction: Features a durable zinc housing and 1/2-inch NPT ports, specifically built for high-duty cycle industrial environments.

How do I plumb the pilot port on this 1/2" regulator?
On this 1/2" NPT model, the pilot port is typically a G1/4 connection. Use a small remote pilot regulator to provide the control signal to the R119-04J to adjust the main output pressure.

Can I use this regulator for fluids or toxic gases?
No. These units are specifically designed for compressed air and non-corrosive gases. Using them with liquids or incompatible media can damage the Buna-N seals and cause the balanced poppet to fail.

What causes the regulator to "creep" after installation?
Pressure creep is usually caused by debris or pipe scale lodged between the poppet and the seat. Ensure you purge all air lines and install an upstream filter to protect the clean internal tolerances of the valve.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.