Series 44-49 High Performance Double Offset Butterfly Valve

High performance double offset butterfly valve in wafer, lug or double flanged bodies of carbon or stainless steel, sized up to 48" and rated Class 150 (Series 44, 45, 46) or Class 300 (Series 47, 48, 49). Seats come in Ultra, PTFE, RTFE, metal (SS, Inconel) or firesafe construction, with fire safe design and NACE versions available. The stem seal is live loaded by a set of Belleville springs and a retainer clip makes the stem blow-out proof.

Body style

Wafer, Lug, Double Flanged

Body

CS, SS

Disc

CF8M, CF8

Stem

316 SS, 17-4 PH, XM-19

Seat

Ultra, PTFE, RTFE, Metal (SS, Inconel), Firesafe

Size range

Series 44, 45: 2" to 48" (DN 50 to 1200); Series 47, 48: 2" to 24" (DN 50 to 600); Series 46: 3" to 48" (DN 80 to 1200); Series 49: 3" to 24" (DN 80 to 600)

Pressure rating

Series 44, 45, 46: Class 150; Series 47, 48, 49: Class 300

Design standard

API 609 Category B, BS EN 593

Testing standard

API 598, BS EN 12266-1

Features

ISO 5211 top plate for direct mounting of a wide range of actuators, handles, and gears; adjustable stem packing features pull down gland with easy access without removal of actuator; tangential wedge pins are offset from centre of stem putting them in compression rather than shear; disc stop designed to prevent disc rotation in wrong direction and potential seat damage; retainer clip provides blow-out proof stem; live-loaded stem seal system by a set of Belleville springs, rocker shaped gland bridge compensates for uneven adjustment of gland bolts; "Bear-X" bearing has excellent thermal, chemical and wear resistance