Keystone Series V11 Butterfly Valves

Double flanged, fully rubber lined valve for marine applications including shipside valves and ballast valves.

These instructions must be fully read and understood before beginning maintenance.

Key Features

The concentric disc offers bi-directional service and allows high Cv values with its symmetric shape
Primary seal is formed by the disc hub and stem top, the seat contact exceeds the pressure rating of the valve
Secondary stem seal is suitable for high pressure and is self-adjusting
Disc hub edge are rounded and hand polished to provide full concentric sealing without seat obstruction to flow, combined with maximum seat life
Replacement seat isolates the stem and body parts from the stream and also serves as the flange gasket
Moulded-in O-ring provides positive flange sealing and eliminates the need for gasket
Double flanged body design specified according to JIS F7480
Heavy duty top bushing absorbs side thrust and torque loads
Stainless steel disc screws allow quick and easy disassembly
Factory testing of every valve at full rating ensures 100% tight shut-off
Type approved by various major shipping class