Siemens Building Technology 184-113 Tee Restrictor

For veteran technicians managing legacy air systems, the Siemens Building Technology 184-113 Tee Restrictor is the critical component for maintaining precise branch pressure in one-pipe pneumatic circuits. Engineered as a direct replacement for the 21-039, this 20 SCIM pneumatic restrictor ensures that bleed-type controllers, such as one-pipe thermostats and transmitters, function with the necessary backpressure for accurate modulation. Without the 0.0051-inch orifice provided by this yellow barbed restrictor tee, the mainline air volume would overwhelm the thermostat's bleed action, leading to erratic valve movements or complete system failure.

Built for a 1/4-inch OD tubing connection, this Type 3 restrictor features an integrated air filter to prevent orifice fouling—a common point of failure in systems with aging compressors. The molded body includes a clear air flow direction arrow to eliminate installation errors in the field. Operating effectively with a nominal air capacity of 20 scim at a 22 psi calibration point, this 5-pack ensures you have the reliable hard-to-find fittings required for Siemens pneumatic controls and 184-series transmitter maintenance. Trust this OEM-spec pneumatic restictor kit to restore linear response and stability to your commercial HVAC air lines.

• Direct OEM Compatibility: Serves as the official replacement for 21-039, ensuring seamless integration with existing Siemens and Powers pneumatic infrastructure.
• Precise Flow Control: Calibrated 20 SCIM flow rate (5.5 ml/sec) provides the exact resistance needed for one-pipe bleed controllers to regulate branch signals correctly.
• System Protection: Internal air filter prevents contaminants from clogging the precision 0.0051" orifice, reducing emergency service calls.
• Error-Proof Design: The yellow poly body and molded airflow arrows facilitate rapid identification and correct orientation during high-pressure repairs.
• Industrial Standard: Specifically designed for 1/4" OD polyethylene tubing, common in pneumatic control panels and terminal equipment.

Can I use this tee restrictor in a two-pipe pneumatic system?
No. This 184-113 restrictor tee is specifically required for one-pipe systems where the controller must bleed air to modulate pressure. Standard two-pipe thermostats regulate the air volume internally and do not typically require an external tee restrictor.

How do I know if my existing restrictor needs replacement?
If your one-pipe thermostat is unable to reduce branch pressure or if the controlled valve slams and stays in one position regardless of the setpoint, the orifice is likely either missing or completely clogged by oil and debris.

Is the flow rate adjustable on this unit?
No, this is a fixed orifice restrictor rated for 20 SCIM. Using a fixed restrictor is essential for maintaining consistent calibration across the entire pneumatic loop.

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.