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Applications SEVEN


Applications with standard function:
different speeds for OPEN, CLOSE,
Emergency OPEN, Emergency CLOSE

  • Rotary actuators 2SA7...
  • Part-turn actuators 2SQ7...

Functions - Characteristics

  • different output speeds (positioning times) for OPEN, CLOSE, Emergency OPEN, Emergency CLOSE


Variable speed decanter improves WWTP efficiency
Various sites across the world

DE
German
02/13
EN/US
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02/13
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Russian
02/13
436
kByte
  


Variable speed lowering and lifting required

Water treatment works using SBRs (Sequencing Batch Reactors) draw off treated water from above the settled solids using a decant arm. This structure must be lowered into the water slowly (typically over around one hour at a constant speed) without disturbing the settled solids at the bottom of the tank.

However, to ensure fast refilling, the arm needs to be raised rapidly to a preset parked position above the water prior to the next decant cycle.

 

Process control and pump protection
INEOS Enterprises, UK

DE
German
02/13
EN/US
English
02/13
RU
Russian
02/13
418
kByte
  


Brine pumping control valves
INEOS Enterprises in Mid Cheshire UK have several hundred brine wells, each using pumps to transfer brine from the well to saturator unit. The flow is controlled using Pump Delivery Recycle Butterfly Valves driven by actuators.

 

Under normal operation when a reduced flow is detected, the actuator which controls the valve is opened over a period of 80 seconds, however, if a reverse flow is detected then the valve needs to be closed in 10 seconds to protect the pump.

 

Different speeds are therefore required for opening, closing and emergency closure to protect the pump.

 

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