This SAE Aerospace Recommended Practice (ARP) provides definitions and background information for understanding the physical performance, and test procedures of electrohydraulic flow control servovalves.
The recommendations are confined to interface definition and input/output characteristics. This ARP does not restrict or attempt to define the internal characteristics of servovalves. As such, the recommendations are equally applicable to valves having different internal functioning, different ratings, different physical size, and valves used with different fluids. In certain instances, standards for valve design are recommended for the purpose of interchangeability, as for example, valve polarity, mounting bolt and fluid port locations.
The ARP provides extensive guidance for the preparation of Procurement Specifications and for functional testing. A sample Procurement Specification is provided in Appendix A. The primary focus of this ARP is on four-way valves. Three-way valves are discussed to a limited extent and terminology for pressure control valves is presented in Appendix B.
This ARP is applicable to fluid power systems in all types of flight vehicles, and it is applicable to Military, Civil and Space design/certification standards. Additional specifications or specialized test procedures may be necessary to define special requirements for specific control systems, and such considerations are beyond the scope of this ARP.
Rationale
This revision of SAE ARP490 document is a result of a scheduled periodic document review. It incorporates changes recommended by the SAE A-6 Panel and committee members.
The Hydraulic Servo Actuation Panel is the panel promoting the advancement of hydraulic servo actuation and control in sciences, technologies, engineering practices, and standards associated with the design, manufacture, operation, and support of aerospace vehicles as follows. The panel develops standards, processes, and practices related to hydraulic servo actuation and control systems for Commercial and Military air vehicles. The scope of these efforts will cover primary, secondary, and utility actuation employed on current and future manned and unmanned aircraft, spacecraft, and missiles.
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ARP490F
Electrohydraulic Servovalves
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Electrohydraulic Servovalves
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