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Unival® BUTTERFLY VALVES Actuation and Accessories Data Sheets Manual CONTROL ACCESSORIES ON ELECTRIC ACTUATED VALVES On our lighter duty L&H Series actuators some options can be provided as follows: Volt Free contacts for indication Positionner 4-20 mA / 0-10 V Remote control Battery for safety position at air failure For any other electric actuator, options and accessories can be found on the corresponding manufacturer’s Web Site or data sheets. OTHER OPTIONS Stem extensions Pad Locked lever Stem Extensions; either for manual operated valves or actuated ones. The length of extension is made to the customer specifi cation, and provides bolting arrangement on both sides: valve stem and actuator stem side with upper part according to ISO 5211 standard. Pad Locked lever; this simple system prevents unauthorized operation at the plant. It is arranged on request. Data subject to change without prior notice 44
Unival® BUTTERFLY VALVES Torque Values for Actuators Sizing Valve Torques in Nm Data Sheets Manual WAFER/LUG VF700/750 Size Disc Differential Pressure (bar) DN (mm) 5 10 16 25 9 9 10 32 9 9 10 40 10 11 12 50 14 15 16 65 22 24 28 80 29 34 48 100 49 65 95 125 78 96 140 150 115 135 195 200 176 195 305 250 291 346 450 300 420 498 635 350 452 605 950 400 725 980 1530 450 1080 1450 2245 500 1280 1900 3015 600 2440 3480 5270 700 3880 5250 8065 750 4470 6080 8910 800 5130 7110 11400 900 6220 9320 14300 1000 10650 13200 19800 1200 12980 17640 23850 GROOVED ENDS VF760 Size Disc Differential Pressure (bar) DN (mm) 5 10 16 50 19 20 21 65 23 25 29 80 28 31 37 100 39 45 53 125 54 64 78 150 83 92 105 200 115 140 170 250 198 238 290 300 265 314 380 REMARKS FOR ACTUATOR SIZING: The torque values given are for water or other non-viscous lubricating liquids at ambient temperature For butterfl y valves with PTFE or other non elastomeric seat, multiply above values by 2 Recommended safety factor to be applied: 25-35% for double acting pneumatic actuators 30-50% for single acting pneumatic actuators and electric actuators There are several factors that can increase above given values and should be taken into account for actuators sizing: -For gases and dry medium (non lubricating), multiply above values by about 1,25-2 depending on application -For viscous liquids increase above values depending on the liquid properties -For unusual service conditions such as likelihood of seat swelling, or low and high temperature seat hardening, and additional safety factor should be considered. There are three torques to be considered when selecting the proper actuator for a butterfly valve: 1) Seating Torque: The torque to displace a resilient seat and effect shutoff. 2) Bearing Torque: The torque required to overcome friction forces on the valve shaft bearing surfaces during valve travel angle (about 30% of seating torque) 3) Dynamic Torque: Due to fl uid forces which tend to close the valve when the valve is partially open. This torque is due to the velocity of the fl uid created by a differential pressure across the valve. Systems should be projected to avoid high velocities across the valve Above given values are inclusive of the 3 torques, the actuator selected must provide the calculated torque over its total opening and closing travel angle. Data subject to change without prior notice 45
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