Series A
Radius L.L.C.
4922 Technical Drive
Milford, MI 48381
Phone: 248.685.0773
For Pricing and
Contact Radius

Radius Series MEH Electro-Hydraulic Actuator

The Radius Electro-Hydraulic Spring Return actuators are specifically designed for use on quarter turn valves and dampers. The unit utilizes a hydraulic spring return actuator assembled to a compact hydraulic unit. When electric power is lost, the springs in the actuator move it to a fail-safe position. The same electro hydraulic unit is used for all models. The unit has many control options such as fieldbus protocol, partial stroke testing devices and 4-20ma modulating positioners.


  • Mounting surfaces according to ISO 5211 and VDI/VDE 3845
  • Standard NEMA 4, 4x. Wiring from the motor to control box protected with stainless steel tubing.
  • The circuit pressure remains stable in spite of wide ambient temperature swings.
  • Multiple combination of springs allow a wide range of torques for one model.
  • Inner cylinder has been completely honed for long service life.
  • Internal hydraulic porting eliminates leaking. No tubing, fittings or hoses.
  • Easy maintenance with Smart Access to the hydraulic and electrical controls.
  • Easily upgradable controls.
  • Smart parts (same electro hydraulic unit is used for all models).
  • Temperature range: -22° F to 176° F


  • NEMA 7 and ATEX
  • For larger torques, scotch yoke electro hydraulic actuators are available.
  • Low temperature versions down to -58° F
  • Stainless steel drive shaft.
  • Special coatings for very high corrosive environments.
  • Optional manual overrides attach easily to the actuator. Both manual gear boxes or hydraulic hand pumps.
  • Fast closing time.