Fouress engineering manufactures butterfly valves for various duties. Fouress bv 895 eccentric disc butterfly-type control valve body assemblies are of flangeless construction 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. The valves are offered with pneumatic spring return diaphragm actuator in compact yokeless design. 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 is the range a36a double acting positioning or on/off actuator. For control duty, butterfly valves can be offered with positioner, air set, position transmitter, solenoid valve, limit switches, etc. Products on request: pneumatic rotary and diaphragm actuators for control duty; pump discharge valves; penstock protection and turbine inlet valves; four way valves; non-return valves [reflux valve].
