Flowserve SNA-Series Pneumatic Actuator - Manual (Page 3)

FCD AXAIM0004- 01 (AUTO-4) 03/ 11 Page: 3 of 4
© 2011, Flowserve Corporation, Printed in USA
3-Position Control/Dribble Control
SR Limit Switch Method
Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr.
Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501
www.flowserve.com Phone: 801 489 2233 Phone: 931 432 4021
Automax Valve Automation Systems
Installation, Operation and Maintenance Instructions
Operation (as viewed from top of actuator)
Double Acting
Applying air pressure to Port 2 drives the pistons outward,
which turns the pinion counterclockwise as the air volume on
the outside of the pistons exhausts through Port 1.
Exhausting the air pressure from Port 2 allows stored
energy of the springs to drive pistons inward, turning
the pinion counterclockwise. Air volume on the outside
of pistons vents through Port 1.
Applying air pressure to Port 1 drives the pistons inward,
which turns the pinion clockwise as the air volume on the
inside of the pistons exhausts through Port 2.
Spring Return (Fail CW)
Applying air pressure to Port 2 drives the pistons outward,
which compresses the springs and turns the pinion
counterclockwise as the air volume on the outside of the
pistons exhausts through Port 1. Exhausting the air pressure from Port 2 allows stored
energy of the springs to drive pistons inward, turning
the pinion clockwise. Air volume on outside of pistons
vents through Port 1.
Spring Return (Fail CCW)
Applying air pressure to Port 2 drives the pistons outward,
which compresses the springs and turns the pinion clockwise
as the air volume on the outside of the pistons exhausts
through Port 1.