2
February 2022
Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
Section 1: General Warnings
General Warnings
1.2
Identification Plate
!
WARNING
It is forbidden to modify the information and the marks without previous written
authorization by Biffi Italia s.r.l.
The plate fastened on the actuator contains the following information (Figure1).
Figure 1
Data plate
1.3
Introducing the Actuator
The hydraulic actuator series OLGA-H was engineered and is manufactured to provide
maximum torque output with minimum supply pressure. The OLGA-H actuators are
suitable for any quarter turn application such as ball, plug, butterfly valves or dampers, in
both On-Off and Modulating heavy-duty service.
The actuator (see Figure 2) is made up of a weatherproof scotch yoke mechanism
transforming the linear movement of the pneumatic cylinder (on closing or opening) into
the rotary movement, which is necessary for operation. The angular stroke of the yoke is
adjustable between 82° and 98° by means of the external mechanical stops screwed into the
left wall of the mechanism housing and into the end flange of the pneumatic cylinder. The
cover of the scotch yoke mechanism is arranged for the assembly of the required accessories
(positioner, signalling limit switches, position transducer, etc.) by means of proper matching
units. The above mentioned accessories are operated by the actuator drive sleeve. The
housing of the scotch yoke mechanism has a flange with threaded holes to fix the actuator
to the valve either directly or, if required, with the interposition of an adaptor flange or a
mounting bracket. The actuator yoke has a hole with keyways suitable for the assembly
of an insert bush the internal hole of which is machined (by Biffi or at Customer's care),
according to the shape and dimensions of the valve stem. Biffi can supply different types of
control system following customer's requirements.
The expected lifetime of actuator is approximately 25 years.
