LEFF® Function - Low Emission Flip-Flop
Reducing water consumption is a key priority in sustainable production. GEA's electronic LEFF function can save more than 90% water and cleaning agents during valve seat cleaning.
At GEA we are continually innovating to improve our customers’ efficiency, reduce their consumption of valuable resources and improve sustainability.
The LEFF® function integrated in GEA T.VIS A-15 control tops has been awarded the GEA Add Better label* for its positive impact on reduced water consumption. Conventionally, mixproof valves run a time-based seat lifting cycle to clean valve seats and intermediate cavity. The LEFF® function is the smarter, more efficient way. The valve opens in a pulsating mode, controlled by path-measuring instead of fixed intervals. This increases the intensity of flushing and effectively shortens flushing times for water and chemicals. It has been proven to saves up to 92% of water and cleaning agent used.
*The add Better label relates to the LEFF® function integrated in GEA T.VIS control top, released in 2003, which saves 92% of water in comparison to conventional valve seat cleaning.
- LEFF® is integrated as a standard feature in the T.VIS® A-15 control top - the best choice for mixproof double-seat valves
- No complicated programming required in the PLC
- No additional system technology required
- Automatic monitoring of the lift function
- Significant cost reductions: up to 92 % savings of water and CIP media
For double-seat valves it simply utilizes standard feedback units, without needing any special components. The straightforward configuration using two push buttons on the T.VIS® cap allows the LEFF® function to be activated separately at any time during set-up for the valve or double disc or even both.
Modulation of the valve disc during lifting makes it possible to drastically reduce cleaning agent consumption, respectively discharge into the drains and thus, reducing operating costs, compared to the conventional seat cleaning method.
Related products
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IO-Link for the T.VIS® A-15
IO-Link is the first globally standardized IO technology (IEC 61131-9) to communicate with sensors and actuators. The powerful point-to-point communication is based on the long-known 3-wire sensor and actuator connection without any additional requirements for the cable material. Therefore, IO-Link is not a fieldbus, but the evolutionary advancement of the existing and proven connection technology for sensors, actuators and thus also for control tops of the latest generation. -
Control top T.VIS® E-20
The T.VIS® E-20 is specially designed to meet the requirements of the liquid processing industry as well as dust explosion protection. In addition, all components of this control top are standardized to the utmost degree. This ensures the simplest and most time-saving handling with high reliability and safety. The technology of the T.VIS® E-20 is based on two separate, magnet-based sensors combined in one sensor module. They are used to detect the valve position and provide the corresponding feedback signals for automated plant operation. The sensor module also provides the optional connection for the pilot solenoid valves to control the valve actuators. -
Proximity Switch Holders
Connection 0, INA, LAT -
Control Top T.VIS® A-15
Development has focussed on the requirements and necessities of our customers from the fluid-processing industry. In addition to safe control and monitoring of all functions of the process valves in breweries, dairies, plants for manufacturing fruit juices as well as pharmaceuticals, the T.VIS® A-15 offers significant advantages that are directly reflected in lower total cost of ownership.
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