Apr 2019 | Robust ball sector valve with a precise control actuator
A high control precision requires an almost backlash-free transmission of the actuating forces to the valve seat. This is the only possibility for the set point to correlate with the opening angle of the valve and the resulting volume flow. The electrical actuator, Type S1500, is able to break a 90° rotary movement down into a maximum of 1,500 steps and also reduces the hysteresis to under 0.15%. A compact actuator transfers the actuating rotation to the valve seat – the ball sector – with almost no backlash.
By combining the precise motor actuator and the robust ball sector valve, Schubert & Salzer has succeeded in manufacturing an accurate and reliable control valve for large volume flows with an enormous rangeability. The set point can either be 4 – 20 mA or 0 – 10 V according to choice and a position feedback is provided via 4 - 20 mA. The valve assembly that comprises the actuator and the ball sector valve is IP67 rated and designed for ambient temperatures of between – 40°C and + 80°C. The ball sector valve in its wafer design is available in sizes from DN 25 up to DN 250 and for a nominal pressure of up to PN 40 for flanges that are conform with DIN EN 1092-1. The actuating time for a 90° rotary movement is approx. 20 seconds and the operating time with an OT of 100 % leaves nothing to be desired. Of course, an emergency manual override is also available.