HLDA
– Double acting - Doubled thrust hydraulic linear actuator
Use and maintenance manual
© Copyright by BIFFI Italia. All right reserved.
Pag. 5
Contents may change without notice
liability shall lapse in the event that any modification or
tampering whatsoever be performed on the actuator.
1.2
IDENTIFICATION PLATE
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
HLDA double acting & doubled thrust hydraulic linear actuators, are
suitable to operate the kind of linear valves with rising-stem or
requiring a high thrust value in the first phase of valve opening and
with lower values during the complete stroke ( wedge gate valves,
through conduit gate valves) for ON-OFF and modulating heavy-duty
service. The actuator is made up of an hydraulic cylinder and a
mounting pedestal complete with a joint for the coupling to the valve
stem of actuator output stem. The valve is actuated in opening and in
closing position by the actuator hydraulic cylinder that is pressurized
in one or in the other direction.
In the first part of the stroke, the total thrust section is obtained by the
double-piston
