A single stage flapper type servovalve comprises a valve housing comprising a bore, a pair of opposed nozzles arranged in the bore and a flapper element arranged between the pair of nozzles. The valve housing further comprises a plurality of fluid ports for communicating a working fluid to and from the nozzles and in fluid communication with the housing bore. The valve housing and the nozzles are both made from a stainless steel material.

A single stage flapper type servovalve comprises a valve housing comprising a bore, a pair of opposed nozzles arranged in the bore and a flapper element arranged between the pair of nozzles. The valve housing further comprises a plurality of fluid ports for communicating a working fluid to and from the nozzles and in fluid communication with the housing bore. The valve housing and the nozzles are both made from a stainless steel material.

The present invention controls the pressure and flow rate of fluid, in order to obtain uniform performance, configure a closed loop magnetic circuit so as to include an electromagnet, a flapper, and a yoke material, and elastically deform the flapper itself by Maxwell attractive force generated between a magnetic pole of the electromagnet and the flapper to make the separation distance between the nozzle and the flapper variable. As opposed to a rigid flapper structure that swingably moves around a supporting point, like a conventional servo valve, the electromagnet, the magnetic pole, the nozzle, the flapper, and the like are arranged such that a change in magnetic gap directly leads to a change in air gap.

A nozzle assembly (N) comprises a nozzle received in a nozzle receiving bore of a nozzle housing. The nozzle receiving bore has a longitudinal axis (X-X). The nozzle housing further comprises a locking pin receiving bore having a longitudinal axis (Y-Y) that is perpendicular to the nozzle housing axis (X-X). The locking pin receiving bore intersects the nozzle receiving bore, whereby an aperture is formed between the locking pin receiving bore and the nozzle receiving bore. A locking pin is received in the locking pin receiving bore, a portion of the locking pin protruding through the aperture and into the nozzle receiving bore so as to engage a circumferential portion of the nozzle.

A nozzle assembly (N) comprises a nozzle received in a nozzle receiving bore of a nozzle housing. The nozzle receiving bore has a longitudinal axis (X-X). The nozzle housing further comprises a locking pin receiving bore having a longitudinal axis (Y-Y) that is perpendicular to the nozzle housing axis (X-X). The locking pin receiving bore intersects the nozzle receiving bore, whereby an aperture is formed between the locking pin receiving bore and the nozzle receiving bore. A locking pin is received in the locking pin receiving bore, a portion of the locking pin protruding through the aperture and into the nozzle receiving bore so as to engage a circumferential portion of the nozzle.