Butterfly Type Control Valve

Fouress Bv895 Eccentric Disc Butterfly type control valve body assemblies are flangeless constructions that use a bi-directional nitrile/viton seals or of metal seated construction. Valves are suitable for low pressure liquids, steam or gas service, and installations where large volumes approaching full line capacity must be handled with low pressure drop. The action of the eccentrically mounted disc minimizes the moving contact of the seal with the seat ring to reduce seal wear and seating torque requirements. Full closure is at 90° to the body axis in both cases.

Features

Actuator

Diaphragm type standard; compact, yokeless design. More powerful types available (the use of which allows larger valve sizes than the maximum limits stated under 'Size Range' above)

Change of action from air-to close to air-to-open or the reverse is effected by adjustment of the linkage between actuator stem and valve disc shaft, using the same actuator.

Also available in our range A36A double acting positioning or on/off actuator for large size valves.

Material Specification

Size Range

Metal seated : 80 to 600 mm. (High Temperature Application)
Rubber seated: 80 to 600 mm. (Tight Shut off)
Low leakage type: 80 to 1000 mm
(larger size up to 2000mm on request)

Note: Maximum temperature for rubber seating with nitrile is 80° C and Viton 180° C

Body material
Cast iron, Carbon Steel, Alloy Steels, Stainless Steel (CF8/CF8M). Rubber/Ebonite lined valves could also be supplied.

Material of Construction

BV895 BUTTERFLY VALVES