Armstrong International D503157 Air and Gas Vent Freon If the 24V HVAC signal

If the 24V HVAC signal is present at the valve terminals but no gas flow is detected at the outlet (checked via manometer)

this multi-port tri-cock features a soft metal seat and stuffing box assembly

In most field applications

The intake-side hub location ensures the air flow is directed toward the motor

This 20-inch HVAC fan blade features a precision-engineered 32-degree blade pitch and a 3-blade configuration to ensure optimal static pressure and heat exchange efficiency

Armstrong International D503157 Air and Gas Vent Freon If the 24V HVAC signalThe Armstrong International D503157 Air and Gas Vent is a high performance Series 21AR Cast Iron Fixed Pivot Ball Float designed for the efficient removal of air and gases from pressurized liquid systems. Engineered with a 1 2" NPT connection and a precision 5 64" orifice, this unit is built to manage a maximum operating pressure of 133 PSI. It is technically identical to the 21 AR 1 2 133 model, providing a robust solution for preventing air binding