Valve is normally open. A 3.13 inch inlet OD is standard. The outlet is a 5.31 inch square flange sized to adapt to a 4 bolt pattern. The inlet and outlet are in line. The poppet seals with special Teflon o-ring mounted in the body. Valve material is a ductile iron body, aluminum poppet and piston with steel main spring and stainless steel poppet spring. The valve has an independent poppet to prevent back flow during operation and at shutdown.
The rated pressure drop is 4 in_wtr (1 kPa) @ 200 scfm (5.66 m³/min) airflow. Here a scfm is one cubic foot per minute of air at 14.696 psia (1.01325 bara), 60°F (15.555°C) and 0.0% relative humidity.
1) Valve can have auxiliary ports on the outlet side of the poppet
2) Valve can be ordered as a low pressure check valve. The main spring is removed, stroke set and the poppet spring is set to meet customer requirements.