Abstract:
A motorized valve is made up of a closable pipe, of a valve shutter, of a rotary electromagnetic actuator and of an overmoulding plastic material, the actuator being formed of a stator assembly, of a rotor secured to a spindle, the valve shutter being positioned progressively by the actuator using the spindle and able to shut off the pipe, the overmoulding plastic material surrounding and being secured at least in part to the actuator and forming the pipe at least in part, the static sealing being afforded by overmoulding plastic material common to the actuator and the pipe, and the overmoulding material having passing through it a passage that is rendered fluid-tight for guiding the spindle that connects the valve shutter and the rotor.
Abstract:
An electromagnetic actuator is intended in particular to drive a relief valve for a turbo-compressor, the actuator including a fixed member formed by a first magnetic stator circuit made from a material with high magnetic permeability excited by at least one excitation coil, and a moving member made up of a thin part, the magnetised thin part being alongside a second magnetic circuit made from a material with a high magnetic permeability, the moving member being provided with a coupling axle, the fixed and moving members being attracted against one another under the combined magnetic effect of the magnetised part and the excitation coil, the fixed member and the moving member being connected by a mechanical connector with friction of the pure sliding type, the connector being a system, directly incorporated into the actuator, for mechanical damping of the outside disturbances applied to the valve, and the connector having a mechanical friction characteristic of the glued-sliding type dependent on the relative position of the moving and fixed members and on the current flowing in the coil.