high speed capability inherent in
hydraulic operation and with a lower
cost of ownership than other solutions.
A number of these actuators have
been installed on the recently completed
Baku-Thilisi-Ceyhan strategic pipeline,
which brings up to 50 million tons per
year of crude from the oilfields of the
Caspian Sea to the Mediterranean coast
of Turkey. The actuators described here
are used for block valve and emergency
shutdown (ESD) duties along the length
of pipeline that traverses Turkey.
This application used electro-hydraulic actuators of the scotch-yoke
type, operating ball valves in sizes up to
42 inches. Four model sizes were supplied, the largest having a maximum
torque output of 200,000Nm.
A modular design of some electro-hydraulic control systems facilitates
assembly, operation and maintenance of
both standard and customized control
logic solutions. Common functions such
as local/remote control selection and
open/close operation are provided as
A consignment of electro-hydraulic actuators
for the Baku-Thilisi-Ceyhan pipeline is on its
way to the valve manufacturer.
standard, while optional features are
Generally, valve actuation can be
performed in one of four ways:
Remotely via energization/de-energization of the solenoid valves
Automatically by control system
logic (e.g., low, high or differential pressure detection)
Locally by either an electrical
pushbutton station or the manual
overrides incorporated into solenoid valves, or
Locally by the manual hand pump
The speed of the operation is independently adjustable in both directions.
The pump/motor/accumulator provides
the hydraulic supply to the solenoid
valves and hydraulic pressure is automatically regulated by a pressure
switch. The motor runs until the preset
maximum pressure is reached and for
safety a pressure limitation valve is fitted as standard.
The hydraulic accumulator system
ensures operation in the event of primary energy failure and also facilitates
fast operating times. A torque control
system to protect the valve and actuator
from overloading is included as standard in all control configurations.
Actuators supplied to the pipeline
were divided into two groups, ESD
valves and mainline block valves. In
both cases the specification called for
stainless-steel control and instrumenta-
A CASE STUDY
AUTOMATED INDUSTRIAL PLANT NEEDS
EXTENDED LIFE ACTUATION.
EXTENDED CYCLE LIFE ACTUATORS ARE USED FOR BFV APPLICATIONS UP TO 30 INCH. THE
ACTUATORS HAVE PROVIDED OVER 5,000,000 CYCLES OF CONTINUOUS SERVICE RESULTING IN
LOWER OPERATING COSTS AND INCREASED PROFITS. THE ACTUATORS ACHIEVE90 DEGREE
ROTATION IN LESS THAN 1 SECOND. UNIQUE END OF STROKE DESIGNS REDUCE SHOCK TO BOTH
THE ACTUATOR & THE VALVE EXTENDING THE SERVICE LIFE.
U T YOU ?
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VALVES THAT REQUIRE PROVEN
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