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Installation, Operation and Maintenance Manual
MAN 564 Rev. 6
June 2020
General Warnings
Section 1: 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).
1.3
Introducing the Actuator
The ALGA actuators was engineered and is manufactured to provide maximum torque
output with minimum supply pressure. ALGA actuators are suitable for the operation of
any quarter turn operation such of 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 .
Figure 1
Data plate
