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| Proportional valves modulate hydraulic or motion parameters according to electronic reference signals. Atos, a leader in pioneering electrohydraulics, offers today one of the most advanced lines of proportional valves which allow similar or better performances in comparison with servovalves whilst maintaining the typical benefits of proportional electrohydraulics: less sensitivity, coarser filtration requirements, intrinsic stability, easier servicing and lower cost. |
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Basic principle of a proportional valve: the force of solenoid is related to the reference signal, thus properly moving the spool against a return spring to modulate hydraulic parameters |
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Atos proportional valves are equipped by exclusive solenoids in the following versions: |
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ZO-A ZOR-A Efficient open loop solenoids, 35 W designed for direct-acting valves |
ZO-AE ZOR-AE As ZO-A plus integral electronic driver analog or digital (S) | |
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ZO-TE ZOR-TE Closed loop solenoids with spool transducer and integral electronic driver |
ZO-LE For high-performance 2-stage valves with two tranducers and integral electronic driver preset in double closed loop | |
| Digital servoproportionals | |
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New digital servoproportionals are performing in thousands advanced applications: spool-sleeve accurated operation, closed-loop integral electronics, high response (see diagrams) with excellent reliability... at the top of proportional lines. See table F180 on Catalog on-line |
| Rugged execution is available versus high vibration duties & shocks up to 30g. Rugged valves have strengthened metal housing, military style connectors, SMD electronics. Also Ex-proof execution, see table E120. |
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