EN -
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OMAL S.p.A.
Headquarters
: Via Ponte Nuovo, 11 - 25050 Rodengo Saiano (BS) Italy •
Production Site:
Via Brognolo, 12 - 25050 Passirano (BS) Italy
Ph.
+39 030 8900145 •
Fax
+39 030 8900423 • [email protected] •
www.omal.it
Rif. UMA800081A - 02/18
INSTALLATION, USE AND MAINTENANCE MANUAL
PNEUMATIC ACTUATOR “DA08”
IT
EN
1) FEATURES
OMAL S.p.A. produces a wide range of pneumatic actuators for valve drive and remote control.
- The use of an actuator is based on the principle of opening and closing the valve connected to it, without
manual operations by means of levers or hand-wheels, but through an electro-pneumatic remote com-
mand.
- The “Scotch yoke” mechanism is a mechanical system designed to transform the linear force into a tor-
sion-type force.
OMAL S.p.A. uses this system when producing its actuators, to transfer the linear force of the pistons to the
movement of the valve shaft.
This system provides a long life for the actuator and the best performance, with the least energy con-
sumption.
- The OMAL S.p.A. Scotch yoke system has a torque curve that makes the maximum torque available right
at the breakaway of the valve, the initial opening moment.
The maintenance must be carried out by OMAL SpA or by qualified personnel.
This manual contains important information regarding the use, maintenance and storage of OMAL S.p.A.
actuators. Please read it carefully before installation and use of the product and keep it in a safe place for
future reference.
2) WORKING CONDITIONS
a - Structure
The OMAL S.p.A. actuators can be used both for indoor and outdoor installations. The technical characteri-
stics such as: the type, the size, the maximum operating pressure, the torque supplied, the maximum ope-
rating temperature, the flange type, the serial and production number, are laser engraved on the actuator
body (see drawing on page 4).
b – Supply fluid
The supply fluid must be compressed, filtered and dry air, not necessarily lubricated, or other inert gases
compatible with the internal parts and lubricants used in the actuator. The supply fluid must have a dew
point of at least 10°C below the minimum temperature indicated on the actuator. The dimensions of the
particles, possibly contained, must not exceed 40 μm (ISO 8573-1, class 5) - EN 15174-3 points 3.4.5.2.
c – Operating pressure
The maximum operating pressure is 8,4 bar (120 psi)
The nominal operating pressure is that which can be found on the plate or on the actuator directly.
d – Operating temperature
The operating temperature can be found on the plate and can vary according to the types of seals that are
being used.
The OMAL S.p.A. actuators work within a temperature range that goes from –20°C (-4°F) to 80°C (176°F);
there are also available versions that can be used with low or high temperature (paragraph 8).
e – Stroke of the actuators
The OMAL S.p.A. actuators are produced for a standard stroke of a 90° rotation.
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