Butterfly Valve with Air Actuator, Spring Return, 4"

Keystone Series 221 Butterfly Valves with Keystone Air Actuators. Spring return style (air to open, spring closes when air is exhausted). Valves include cast iron bodies, EPDM seats, 316SS stainless discs and 416 stainless stems. Valves are rated to 250 PSI and 250 Deg. F. Air actuators are direct mount (no brackets) and include 1/4" FPT air port connections.

Designed to open/close valves at 80 PSI in most applications, 150 PSI maximum.

NOTE: The EPDM seats used in these valves are not suit­able for use with Diesel Fuel. Buna & Viton® available.
This model is an air actuated valve with a spring that closes valve when there is a loss of air pressure.