The Keystone 221 (Wafer) and Keystone 222 (lug) are molded-in resilient seat design Butterfly Valves. The Keystone 221 and 222 are suited for use in heating, ventilation, air conditioning and general service industries.
Features
Molded-in resilient seat provides bubble-tight shutoff to 250 psi
Offered in two body styles: wafer and lug. The lugged body is drilled and tapped for isolation and removal of downstream piping at full rated pressure
Round, polished disc and hub edge provides 360 degree concentric seating, minimum flow restriction, lower torques and longer seat life
Upper and lower inboard bronze bearings ensure longer service life with low operating torques
Thru-stem design provides high strength and positive disc control with standardized end connection for operator interchangeability
Extended neck allows adequate clearance for flanges and insulation
Bi-directional, self-adjusting stem seal, located in the upper journal, is suitable for vacuum and pressure while also preventing external contamination of the stem area
Heavy-duty corrosion resistant top bushing, located in the upper journal, absorbs actuator side thrust
Cast-in top plate is an integral part of the body and is standardized to allow direct mounting of all Tyco Actuators
Each Valve is factory tested to 110 percent of specified pressure rating.
