Marwin Valve UT Series Pneumatic Actuators - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.marwinvalve.com
I & M UT Series (Pre 2003 Design)
Installation & Maintenance Instructions for
Marwin UT Series Actuators ~ UT-0A, UT5 thru UT7
(all versions), and UT-0 thru UT-4.5 (Pre 2003 Design)
Warning: Marwin Valve Ball Valves must only be used, installed and repaired in accordance with these Installation &
Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event of leakage
or other malfunction, call a qualified service person; continued operation may cause system failure or a general hazard.
Please read these instructions carefully!
Your Marwin Valve product will provide you with long, trouble-free service if it is correctly installed and maintained.
Spending a few minutes now reading these instructions can save hours of trouble and downtime later. When making
repairs, use only genuine Marwin Valve parts, available for immediate shipment from the factory.
Scope
This manual is intended as a guide to assist customers in the storage, installation, and maintenance of Marwin UT
Series Pneumatic Actuators UT-0A, UT-5 thru UT-7 (all versions), and UT-0 thru UT-4 (Pre 2003 design). See photo on
back page for further identification.
Main Characteristics
 Maximum Air Supply: 116 psi (8 bar)
 Supply: dry air (STANDARD). Other fluids or gases are possible if compatible with actuator materials.
 Temperature: from -4°F to +185°F (-20°C to +85°C) for standard version with NBR seals;
from -4°F to +302°F (-20°C to +150°C)) for HIGH TEMP version (Viton seals);
from -40°F to +185°F (-40°C to +85°C) for LOW TEMP version.
 Rotation: 90° stroke with regulation +/-10° in open position.
 Lubrication: during assembly, for the actuator life.
Operating Principle
The Marwin UT pneumatic actuator is a quarter-turn rack and pinion type that transforms the linear motion of the
pistons (7), due to the thrust caused by the pressure on the surface area, to a 90° rotary motion of the pinion (2).
Pressurizing the left or bottom air port (P1) fills the
external chambers. The action of the pressure on the
surface of the pistons (7) creates a force (F) that pushes
them toward the pinion, generating a torque with
CLOCKWISE ROTATION. Pressurizing the right or top air port (P2) fills the internal
chamber. The action of the pressure on the surface
of the pistons (7) creates a force (F1) that pushes
them toward the end caps, generating a torque with
COUNTERCLOCKWISE ROTATION.
Double Acting
CLOSED OPEN
IN
AIR
P1
TOP
VIEW
IN
AIR
P2
7 2 2
7
7
7