Maxitrol 12A09 Vent Limiter

The Maxitrol 12A09 Vent Limiter is an essential ball-check safety component designed for indoor gas pressure regulation. This 1/8" NPT brass automatic vent limiter is engineered specifically for use with Maxitrol 325-3 and 325-3L series regulators. By installing this device directly into the regulator vent, technicians can eliminate the need for costly and labor-intensive external vent piping to the outdoors. In the event of a diaphragm rupture, the internal ball check limits gas escapement to within ANSI Z21.80/CSA 6.22 standards, ensuring the system remains safe and compliant. For optimal performance, the regulator should be mounted in a horizontal upright position to allow the ball check to function without obstruction.

Key Benefits

• Eliminates External Venting: Specialized design allows for indoor regulator installation without venting to the building exterior, saving on material and labor costs.
• Automatic Safety Response: Employs a precision ball-check mechanism that permits free inhalation during normal operation but restricts gas flow if a diaphragm failure occurs.
• High-Pressure Certification: CSA certified for use with 5 psi natural gas and 2 psi LP gas systems when paired with compatible 325 series units.
• Durable Brass Construction: Manufactured from corrosion-resistant brass to withstand demanding mechanical room environments.
• Code Compliance: Meets ANSI Z21.80 and CSA 6.22 requirements for vent limiting devices on line pressure regulators.

Common Questions

Can the 12A09 be installed on any gas regulator?
No, the 12A09 is specifically certified and sized for Maxitrol 325-3 and 325-3L series models. Use on non-compatible models may violate local codes and compromise safety.

Does this unit work for outdoor installations?
No. Vent limiters are designed for indoor use. Outdoor installations should use a vent protector to prevent moisture and debris from entering the regulator vent port.

What is the proper mounting orientation?
To ensure the ball check does not prematurely seat and cause regulator lock-up, the regulator must be installed in a horizontal upright position when using the 12A09.

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.