Wafer Style Butterfly Valve, 4" Size, 221 Series

Keystone Series 221 Butterfly Valves feature rugged quality construction. Lockable handles. Maximum flow area for use in on/off as well as throttling control applications. Standard seat is EPDM with Buna available (both FDA rated). The bonded seat is designed to completely isolate the valve body parts from the liquid. Rounded, hand polished disc and hub edge give full concentric seating without seat obstruction, providing maximum seat life.

These valves have a molded-in resilient non-replaceable seats; suitable for full vacuum applications. (For buna seals add “B” suffix).

The EPDM seats used in these valves are not suitable for use with Diesel Fuel. Buna also available (with 304 SS discs). Use “B” suffix.

Stem: 416 Stainless Steel
Disc: 304SS Stainless Steel
Body: Cast Iron
Seat: EPDM
W.P. Rating: 250 PSI
Vacuum Rating: Full

Temperature Range: -20 Deg. F to +250 Deg. F
Pressure: to 250 PSI
These valves have a molded-in resilient non-replaceable seats; suitable for vacuum applications.

Viton® is a registered trademark of DuPont Performance Elastomers