Patent ID: 9746098
Date: 2017-08-29
CPC Classifications: F16H,F16K

Claim:
1. A valve operator assembly for a valve comprising a valve body and a valve translating member axially moveable, the assembly comprising: a housing adapted to be mounted on the valve; an input member rotatably mounted with respect to the housing and comprising a rotational drive input; a transmission mechanism connected to the input member and comprising a translating element adapted to be connected to the valve translating member of the valve, wherein the transmission mechanism is adapted to convert applied rotation of the rotational drive input into axial translation of the translating element; at least one elastic actuator axially located between the input member and the translating element to obtain a compression of the elastic actuator during an axial translation of the translating element towards the input member and a release of the elastic actuator during an axial translation in the opposite direction; and the transmission mechanism further comprising: a screw, a nut surrounding and coaxial with said the screw, and a plurality of rolling elements radially disposed between the screw and the nut and each engaged in both outer and inner threads provided on the screw and the nut; and wherein a contact diameter (D wherein L corresponds to the lead of the screw mechanism, and wherein Φ corresponds to a determined non-back-driving factor which is chosen from 0°<Φ≦1°, the contact diameter being provided in order to prevent back-driving of the mechanism.