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BT300/BT320 Triple Offset Butterfly Valves

BT300, BT320 triple-offset butterfly valves, shaft offset is created by designing the valve with the shaft located behind the centerline of the sealing surface (offset1) and slightly to one side of the pipe centerline (offset2). The third offset is point of intersection of tangents of seat and disc sealing deviating from the disc  face. These offets are to completely eliminate all disc to seat friction throughout the valve’s entire 90 degrees of rotation. Metal seal, laminated seat are optional. The triple-offset provides ANSI ClassIV, V, VI leakage performance. The seat seal ring can be changed easily from the body. BT300 is wafer type，BT320 is double flanged type.   Triple-offset Construction Specifications Body Styles BT300 BT320 Connections Wafer Type Double Flanged Type Body Size 3”~60” 3”~40” 4”~36” Body Rating ANSI 150#~300 ANSI 600# ANSI 900#~2500# Fluid Temperature -196~+650℃ Body Material WCB, WC6, WC9, LCB, CF8, CF8M, CF3, CF3M, A995-4A, etc… Disc Material WC6, WC9, LCB, CF8, CF8M, CF3, CF3M, A995-4A, etc… Disc Treatment ENP or Stellited No.6 Flow Characteristics Approximate EQ% (Inherent Characteristic) Rangeability 70° Opening/50:1, 90° Opening/100:1 Seat Material Solid Metal Seat Laminated Seat A564-630/PH UNS S31803 Nitronic 50 Inconel 718 UNS S31803+Graphite Inconel 718+Graphite Seat Leakage ANSI Class Ⅳ, Ⅴ, Ⅵ ANSI Class Ⅴ, Ⅵ Actuator Combination    D100RA: Multi-spring Pneumatic Diaphragm Actuator    P100LA: Pneumatic Cylinder-Piston Actuator       Seal Parts Assembly Solid Metal Seat Laminated Seat Body Size/L Calss Body:10” and under,M Class Body:4” and under Body Size/L Calss Body:12” and over,M Class Body:6” and over Solid Metal Seat Laminated Seat

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