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MAN 604A Rev. 5
General Warnings
June 2020
Installation, Operation and Maintenance Manual
1.2 Identication Plate
!
WARNING
It is forbidden to modify the information and the marks without previous written
authorization by Bif Italia s.r.l. The plate fastened on the actuator contains the following
information (Figure1).
1.3 Description of the Actuator
ALGAS low pressure pneumatic spring-return, are suitable for the operation of
quarter-turn valves (ball valves, buttery valves, plug valves) in both ON-OFF and
modulating heavy-duty service.
The actuator is made up of a weatherproof scotch yoke mechanism transforming the linear
movement of the pneumatic cylinder (or mechanical manual override, if foreseen) and of
the spring into the rotary movement, which is necessary for operation.
The spring-return pack incorporates up to four springs, fully encapsulated in a factory
welded cartridge: this ensures safety to personnel and simplies assembly. The spring
action can be easily changed in the eld from to close in to open or from to open in to close
(modular design).
The angular stroke of the yoke is adjustable between 82° and 98° by means of the external
mechanical stops screwed into the end ange of the pneumatic cylinder and into the end
ange of the spring-return pack. The cover of the scotch yoke mechanism is arranged for
the assembly of the required accessories (position-transmitter, signaling-limit switches,
positioner, 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 ange with threaded holes to x the
actuator to the valve either directly or, if required, with the interposition of an adaptor
ange or a mounting bracket.
The actuator yoke has a hole with keyways suitable for the assembly of an insert bush or a
stem extension. Their internal hole is machined (by Bif or at Customer's care), according
to the shape and dimensions of the valve stem.
Bif can supply different types of control system following Customer's requirements.
Section 1: General Warnings
Figure 1 Data Plate
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