8500 OCT — Triple Offset Butterfly Valve (Standard)

Severn's flagship triple offset butterfly valve, featuring the company's patented Oblique Cone Technology (OCT) — a circular sealing geometry that provides a uniform sealing load around the full circumference of the seating diameter, delivering more consistent and repeatable shut-off than traditional elliptical triple offset designs. 

8500 OCT-SW — Triple Offset Butterfly Valve (Seawater Service)

A dedicated seawater variant of the 8500 OCT, engineered to eliminate the risk of galvanic corrosion caused by graphite contact with saline line media. 

8500 OCT Cryogenic — Triple Offset Cryogenic Butterfly Valve

Severn's cryogenic variant of the 8500 triple offset range, developed for LNG, LPG, liquid nitrogen, liquid oxygen, and other low-temperature applications where standard gland packing arrangements cannot be used. 

8300 — Double Offset High Performance Butterfly Valve (Standard)

Severn's established high performance double offset butterfly valve for demanding industrial applications requiring reliable bubble-tight shut-off across a wide range of pressures and temperatures. 

8300 Cryogenic — Double Offset Cryogenic Butterfly Valve

Severn's cryogenic variant of the 8300 double offset range, developed for low-temperature service where standard gland arrangements are unsuitable. Open or closed extension bonnets keep gland packings located away from the cold line media across all valve sizes.

8100 Swing Clear — High Temperature / Severe Service Butterfly Valve

Severn's single offset swing clear butterfly valve, designed for the control of liquids and gases in severe service applications — primarily chemical and petrochemical duties where the process conditions make a conventional seated design impractical or where complete tight shut-off is not a requirement. 

8200 Step Seat — Reduced Leakage Severe Service Butterfly Valve

Severn's step seat variant, providing reduced leakage performance compared to the swing clear 8100 for applications where some degree of shut-off improvement is required without the full sealing duty of an offset seated design. Suited to high and low temperature gas service and limited severe service applications where tighter leakage than a standard swing clear is needed but full bubble-tight shut-off is not the design requirement. Shares the same body style options, size range, and temperature capability as the 8100.