The LPU – (Local Power Unit) comprehends an integrated electro-hydraulic system for remote control of valves and actuators and is especially developed to be bulkhead mounted or mounted directly on valve actuators, primarily onboard ships. The LPU-S version is used with single-acting actuators for controlling spring closing of valves…
For use with Damcos BRCF 125 – 16000, KF 65 & KC125/250 Actuators.
Specifications
- Max. Running Time: Up to 10 min. depending on ambient temperature (max. 25% duty cycle)
- Enclosure Rating: IP 68 – see Product Data Sheet for more detail
- Ambient Temperature: -5°C to 70°C ( -25°C to 70°C on request)
- Weight: 18 to 26 Kg depending on type
- Tank Volume: 120 to 930 mL depending on requirements
- Cable Glands: 1 to 5 depending on configuration
- Materials of Construction: GGG40 – for more detail see Product Data Sheet
Features
- Modular design in lightweight materials for safer and easier assembly and maintenance
- Main hydraulic block S acting as rack for the modular design
- Control block S being the heart of the hydraulic functionality
- Built-in quick closing function for single acting actuators
- Easy mounting of feedback (DPI) from outside the LPU
- Automatic bleeder enabling free installation of the unit in all directions without the need for repositioning the bleeder
- Variable pump enabling easy speed adjustment for different actuator sizes (200 – 1500 ml/minutes)
- Plug connection enabling safe work environment and ease of installation
- Separate speed adjustment for opening and closing of single acting actuators
- Safe oil filling from portable hand pump
- Safe hand pump functionality for safe operation without risk of draining oil out of the unit
- Option for low oil level switch warning (Elite)
Description
The LPU-S is designed to control spring closing or spring opening actuators by mounting either directly on actuator or remotely on bulkhead. Oil pressure is used for opening the valve by pressing the springs together. Closing valve by means of mechanical springs.
In the modular design of the LPU the Base Hydraulic Block acts as the rack and the Control Block as the heart of the hydraulic function. For LPU-S these blocks are named Base Hydraulic Block S and Control Block S.
The LPU standard versions comes with several electrical alternatives with different levels of possibilities and functions, such as LPU Basic, Plus, Elite and P-NET. For further information about the different versions, please see separate PDS. The LPU-S has a built-in quick closing function and therefore does not need an external QC-Block.
Damcos LPU-S Operations (Fail Close)
To move the valve towards open, the motor (3) is activated. The oil is led from tank through the pump and through the nonreturn valve (5), directly to the actuator B port. To prevent the oil from flowing back to tank, the solenoid valve (15) must be energized. When the valve is fully open, the pressure rises to 150 bar which causes the pump safety valve (4) to open and the oil flows back to tank. The motor is de-energized. The actuator is now hydraulically locked in position by the solenoid valve. In case of a major increase of temperature, the pressure may rise. This will not cause any problems because of the safety valve (14) which will open at approximately 225 bar. The valve can be stopped (and hydraulically locked) in any intermediate position simply by de-energizing the motor. If the pressure drops while valve is fully open due to a minor leakage in the solenoid valve or due to temperature variations, the pressure switch (6) (optional) will detect this. The motor may then be activated for some seconds in order to keep up the pressure, and prevent the valve from leaving the open position. This may take place automatically. To move the valve towards closed, the solenoid valve is de-energized. The springs then move the valve, pressing the oil back from the actuator B port, through the throttle valve (16) and the solenoid valve (15) to the LPU tank.
Damcos LPU-S Emergency Operations
Other Links
Damcos LPU-S Local Power Unit, Electro-Hydraulic Single Acting
Damcos LPU-D -Local Power Unit, Electro-Hydraulic Double Acting
Damcos LPUM-S Local Power Unit, Electro-Hydraulic Single Acting
Damcos LPUM-D Local Power Unit, Electro-Hydraulic Double Acting
Damcos BRC Hydraulic Actuators – Double Acting – 1⁄4 Turn
Damcos BRCF Hydraulic Actuators – Single Acting Spring Return
Damcos KC Hydraulic Actuator – Linear Double Acting
Damcos KF Hydraulic Actuator – Linear Single Acting/Spring Closing
Damcos KFR Hydraulic Actuator – Linear Single Acting/Spring Closing with Handpump
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is a trademark used under licence from Meson AB