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3. Electrohydraulic flow servovalves
3.1 Definition
The electrohydraulic servovalve is a proportional-action device whose input is an electric current and whose output is a hydraulic flow (sometimes pressure). This makes the servovalve the heart and soul of electrohydraulic servo systems.
There is widespread confusion, even in manufacturers' catalogs, between servovalve and solenoid valve. In principle, the term "solenoid valve" should be reserved for an on-off device whose input is an electric current and whose output is a hydraulic flow.
There are currently several hundred types of servo valve on the market, corresponding to dozens of different principle diagrams.
A servovalve includes at least :
an...
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Electrohydraulic flow servovalves
Electrohydraulic pressure servovalves
Bibliography
Organizations
France
Bureau de normalisation de l'aéronautique et de l'espace (BNAE) http://www.bnae.asso.fr
Centre technique des industries mécaniques (Cetim) http://www.cetim.fr
Comité de normalisation des moyens de production (Cnomo)...
Standardization
French Standards Association (Afnor)
- Transmissions hydrauliques et pneumatiques. Symboles graphiques et schémas de circuits. Partie 1 : symboles graphiques. - NF ISO 1219-1 - Mars 1992
- —. —. Part 2: circuit diagrams. - NF ISO 1219-2 - Juin 1998
- Aéronautique et espace. Pompes hydrauliques à débit variable régulé...
Recommendations
Comité de normalisation des moyens de production (Cnomo) (French standardization committee for production equipment)
- Transmissions hydrauliques. Règles générales relatives aux systèmes. Sélection et complément de ISO 4413:1998. - E 05.01.135.N - Juin 2001
- Réservoirs hydrauliques. About et raccord de remplissage et...
Builders, manufacturers, suppliers
This list is not exhaustive.
Accesso Ferm http://www.accesso-ferm.fr
ACHP http://www.achp.fr
...
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