Servo valve with improved sealing and method of manufacturing the same

A method of manufacturing a servovalve having a torque motor section and a hydraulic section, the method comprising:

• forming said torque motor section by:
• providing an armature/flapper assembly by providing a torsion bridge and connecting a first end of a flapper to an armature plate so that said flapper extends from said armature plate along a first longitudinal axis X;
• and
• positioning said armature plate so that it extends along a second longitudinal axis Y that is perpendicular to said first axis X;
• said method further comprising:
• providing said hydraulic section by:
• providing a housing that comprises a body section and a chimney section, said chimney section extending from said body section to a first end, said chimney section having an outer surface and an internal hollow channel extending along said first longitudinal axis X and from said first end and into said body section;
• and
• wherein said method further comprises:
• positioning said flapper so as to extend within said internal hollow channel;
• and
• wherein said method further comprises:
• sealing said hydraulic section from said torque motor section by:
• providing a sealing means on said outer surface of said chimney section at said first end;
• and providing said torsion bridge around said sealing means, so that said sealing means contacts both an inner surface of said torsion bridge and said outer surface of said chimney section, to thereby provide a seal between said inner surface of said torsion bridge and said outer surface of said chimney section;
• and
• providing a groove on said outer surface of said chimney section at said first end, and positioning said sealing means within said groove.