Overview

Features and Advantages

Stem Blow Out Prevention Ring

Prevent stem ejection in accidental working situation.

Replaceable Disc Seal

Reduce field maintenance costs.

Live Loading Packing Gland

Standard low emission stem seal with 0-20 PPM live-loading provides predictable and constant packing compression for more than 5000cycles before adjustment or re-packing.

Metal-to-Metal Patented Sealing System

Stellite Alloy HRC 40-60 degree centigrade

Disc Position indication

Stem end provides fool-proof verification of disc location.

Universal Mounting

Actuator Mounting Plate and Stem Connection conform to ISO5211

Principle Of Operation

The SDF Triple Offset Butterfly Valve provides a bi-directional bubble tight shut-off. This geometry ensures that the disc seal contacts the body seat only at the final shut-off position without rubbing or galling, providing a torque generated resilient seal with sufficient“wedging”to ensure a uniform seal contact.

THE TRIPLE OFFSET GEOMETRY

OFFSET 1 The shaft is offset behind the seat axis to allow complete sealing contact around the entire seat.
OFFSET 2 The shaft centerline is offset from the pipe and valve  which provides interference free opening and closing of the valve.
OFFSET 3 The seat cone axis is offset from the shaft centerline to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat.