Operation Conditions - omal automation DA2880 Installation, Use And Maintenance Manual

1) GENERAL FEATURES
OMAL S.p.A. produces a wide range of pneumatic actuators, with "Scotch yoke" mechanism, for valve drive
and remote control. Such actuators are available both in the double acting "DA" version and in the Spring
Return "SR" version.
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 torsion-
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.

2) OPERATION 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 6).
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. Operation pressure.
The maximum operating pressure is 8,4 bar (120 psi), 7 bar (100 psi) for the DA8000.
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 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 91° rotation; an adjustment that reduces
the stroke by 10° (in the closed valve position) is available upon request.
f. Opening and closing rates.
The cycle rate depends on different factors such as the supply pressure, the capacity, the connection sizes,
the characteristics of the solenoid valves, the room temperature, the valve torque and its characteristics.
OMAL S.p.A.
Headquarters: Via Ponte Nuovo, 11 - 25050 Rodengo Saiano (BS) Italy •
Ph. Fax
+39 030 8900145 • +39 030 8900423 • info@omal.it •
Rif. UMA800081C - 02/18
PNEUMATIC ACTUATOR "DA2880" - "DA8000" "SR1440" - "SR4000"
Production Site:
Via Brognolo, 12 - 25050 Passirano (BS) Italy
www.omal.it
INSTALLATION, USE AND MAINTENANCE MANUAL
3
EN -