Keystone Hydraulic Actuators OLGAS-QA & ALGAS-QA Quick-acting Actuators
Quick-acting spring-return actuators for 90° valves fast operation
Special features for the °∞OLGAS-QA°± hydraulic actuato
-Special 2 way / 2 positions high flow capacity dump valves
-Emergency operation controlled by an electric signal to the relevant solenoid valve or by
depressurising the main oil supply line or an oil pilot line
-Manifold design of cylinder end flange for compact assembling of dump valves, solenoid valves,
servovalves or proportional valves, minimising the use of piping connections, reducing the risk
of oil leakage also in case of strong vibrations, highly increasing the total reliability of the system
and allowing easier assembly and disassembly of components
-Return oil recovery into the cylinder head flange chamber during the emergency quick operation
with the following benefits:
-no oversizing of the oil return piping to the hydraulic power pack, with significant saving for the
customer
-repeatability of the relevant stroking time which is independent from the pressure in the oil
return piping under any working condition of the plant
-Cylinder double tube design to connect the cylinder end flange manifold (where the dump valve
is assembled) to the cylinder head chamber by an annular duct to provide a large flow area:
pressure drops are minimised, allowing shorter stroking times; performances and reliability are
increased compared to a connection by external piping and threaded fittings
-Electroless nickel plated cylinder, tubes, flanges and piston to allow the use of any kind of
hydraulic fluid (mineral oil, oil for turbine lubrication, phosphoric ester and other fire-resistant
fluids)
-Cylinder seals in Viton or other material suitable for the fluid working conditions and to meet
customer specifications
-Oil supply and return line flange connections available
-Special flanged °∞guarded°± oil connections availab
-Special oil shield available for various configurations
-Solenoid valves poppet type no-leakage, low power consumption available
-Standard components bodies in carbon steel or cast iron. Stainless steel versions can be
supplied
-Controlled oil cleanliness, where required
-Possibility to combine On-Off fast acting and Modulating operation by means of servovalves or
proportional control valves
Special features of the °∞ALGAS-QA°± pneumatic actuato
-BIFFI design large capacity quick exhaust valve integrally built into the end flange of the cylinder
-Special damping system to gradually reduce the speed in the last portion of the valve stroke,
avoiding possible impact damages to the valve trim and to the actuator itself
-Use of direct acting solenoid valves to control the actuator fast acting operation
-Possibility to combine On-Off fast acting and modulating operation by means of pneumatic or
electro-pneumatic positioner with air booster, where required
Technical data
-Seven actuator sizes from model 0.3 to 18. Larger sizes available on request
-Torque range: from 400 Nm to 80000 Nm. Higher values available on request
-Motorised valves: butterfly, ball, special
- Operating time:
0.2 sec to 1 sec (for OLGAS-QA)
0.3 sec to 2 sec (for ALGAS-QA) depending on:
- valve size, type and torques
- supply pressure
- inertia of the valve and actuator mobile parts
- Power supply:
Note
OLGAS-H-QA: high pressure oil at 80 to 250 bar g (from power packs)
OLGAS-QA: low pressure oil at 5 to 30 bar g(from turbine lubrication system)
For large valves with significant moment of
ALGAS-QA: instrument air or natural gas at 3 to 10 bar g
inertia and very short operating time the
-On-Off service, spring to close or spring to open
suggested solution is the hydraulic actuator,
-Combined version On-Off + Modulating service on request
possibly with high pressure supply.
-For hydraulic actuators, separate or on-board power packs for electro-hydraulic or pneumo-
hydraulic oil supply
-Electric components enclosures can have explosionproof and/or weatherproof protection
Write a review
Your Name:Your Review: Note: HTML is not translated!
Rating: Bad Good
Enter the code in the box below:
