MTS Series 201 Actuators - Manual (Page 16)

Series 201 Actuator Product Information 16
Functional Description
3 Piston rod The single-ended piston has a greater effective piston area in
compression and offers maximum compressive force in a
compact package. The hollow piston rod allows for installation
and accurate alignment of a displacement transducer.
4 Piston seal A reinforced Teflon seal on the piston provides a positive seal
and reduces friction.
5 Piston rod bearings Series 201 Actuators are supplied with high-capacity non-
metallic bearings. The non-metallic bearings are standard
because of their low friction, extended life, and resistance to
failure from galling and seizure.
6 High-pressure seal The high-pressure seal is designed for long life and low friction.
A small amount of fluid is allowed to flow past the high-pressure
seal for continuous bearing lubrication.
7 Low-pressure seal and
wiper seal The low-pressure seal provides a hydraulic seal, while the wiper
seal functions as a scraper ring to minimize external
contamination of the seals and bearings. The low-pressure seal
wipes hydraulic fluid passed by the high-pressure seal from the
piston rod and guides the fluid into the drainback port.
8 Drainback port Drainback ports return hydraulic fluid passed by the high-
pressure seal back to the system hydraulic power supply.
9 Displacement transducer
cavity The Series 201 Actuator can optionally come with either a linear
variable differential transformer (LVDT) or Temposonics
displacement transducer. The displacement transducer provides a
piston rod displacement feedback signal to the system control
electronics.
10 Seal housing The convenience of this design simplifies seal and bearing
service. The housing contains the rod end seals and wiper, and
the bearing is exposed for easy replacement when the seal
housing is removed.
Description of Series 201 Actuator Components (part 2 of 2)
I TEM C OMPONENT D ESCRIPTION