Actuator series offers 1:10 control ratio

July 2003 Valves, Actuators & Pump Control News & Events Security Services & Risk Management

G. Kromschröder has developed a new series of actuators. The first member of this series is the 3-point step IC 20 actuator, with butterfly valves for air (BVA) and for gas (BVG).

Figure 1(a). The IC 2O actuator with butterfly valve

The IC 20 actuator is designed to adjust the flow rate for modulating combustion processes and for all applications that require precise, controlled rotary movement between 0° and 90°. A control ratio of 1:10 can be achieved without any problem. The low fire rate or ignition positions can be precisely adjusted on the IC 20 using switching cams. The high fire rate position can also be adjusted to suit the system specifications. A conductive plastic potentiometer is available for position feedback.

Figure 1(b). The BVH butterfly valve

Control for the actuator is facilitated by a standard automatic/manual switch, a position indicator and the infinitely adjustable switching cams. The spacious terminal connection box facilitates easy connection of the electrical cables. The BVA and BVG butterfly valves feature low leakage rates and pressure losses. Other positive points include direct installation without adaptors and the high holding torque of the actuator, which makes it unnecessary to employ extra brake elements for when the actuator is not connected to the power supply.

The high protection specification (type IP65) and the wide ambient temperature range (from -20 to +60°C) mean that the actuator is suitable for a wide range of installations in tough industrial environments.

The IC 20 actuators can be supplied with running times from 7 to 60 seconds and for voltages of 120 V a.c. and 230 V a.c. 50/60 Hz. The butterfly valves are available in nominal sizes from DN 40 to 150. The IC 20 is EC type-tested and certified under the Low Voltage and EMC Directives, the BVG butterfly valve is also EC type-tested and certified under the Gas Appliances Directive.

For more information contact The Combustion Group, 011 452 5060, www.combustion.co.za

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Valves, Actuators & Pump Control

Actuator series offers 1:10 control ratio

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