Control systems

To enable you to make the right choice for your application Spirax Sarco has developed a range of control systems ranging

from simple self-acting controls to systems that will fit into highly sophisticated control loops.

1. Electrically actuated control valves

Two-port or three-port valves manufactured in a wide choice of

materials for pressures up to 40 bar and having connections in

sizes up to DN200.

The actuators are suitable for HVAC or industrial process

applications and are available with VMD, mV or mA input

signals.

Options include: spring reserve and, where more accurate

control is required, a valve positioning card.

2. Pneumatically actuated control valves

Two-port or three-port control valves manufactured in a wide

choice of materials for pressures up to 40 bar and having

connections in sizes up to DN200.

Pneumatic actuators are low profile to NAMUR standard,

spring-to-open or spring-to-close, and incorporate a fully rolling

diaphragm. A handwheel option is available.

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3. Positioners

To complement the range of pneumatically actuated

control valves, pneumatic and electropneumatic

positioners will allow small actuators to close against

higher differential pressures, eliminate hysteresis and

improve accuracy and positioning time.

Variants are available with automatic commissioning,

smart control, programmable functions and digital

communications.

4. Programmable electronic controllers

Panel mounted single loop controllers suitable for single

or multi-setpoint control. They incorporate PID, auto

TUNE and ADAPTIVE algorithms. Multi-input options are

available.

5. Pneumatic controllers

For the control of pressure or temperature. Pneumatic

controllers are available with simple proportional control

action, or with the addition of integral and derivative

action. Temperature sensing is via a nitrogen filled

direct expansion system and pressure sensing by

interconnecting pipework to an internal bourdon tube.

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