Flow Detector Series FD

The series FD flow detector, nominal size 12, detects a preset flow rate and can be used for various monitoring functions. 
Meeting the safety requirements of EN ISO 13849 often requires fitting an upstream valve as a second shut-off route. Its diagnostic information is provided by a downstream pressure transducer. In this way, a safe shut-off is always possible. The one remaining loophole is where a directional valve jams in the operated position, a situation that cannot be detected until another, parallel-connected actuator is operated. This loophole can be closed with the flow detector, which is fitted downstream of the On/Off valve. When the On/Off valve is initially opened, there must be no significant flow. Next the respective directional valve should be operated.
Typically, the flow detector is used for mobile applications in which auxiliary actuators are supplied in parallel from one pressure source. This is required, for example, as a monitoring function for steering pumps in mobile machines.

Flow Detector Series FD
  • Requirements according to EN ISO 13849 can be fulfilled
  • High pressure rating, with safety factor of 3
  • Low headloss
  • Wide viscosity range
  • Plug connection with M12, A coding for protection class IP 67
  • Non-contact switching
  • Integrated PTC thermistor module (short-circuit protected)
  • Stainless steel body, other exposed parts with zinc-nickel coating
  • For line-mounting installations
Type Volume flow rate
l/min
Operating pressure
bar
Flow rate / switching range
l/min
FD 160 420 1.0 / 2.0 / 5.0 / 8.0 / 12.0 / 16.0 *

*  for other contact Bucher

  Type File extension Size
FD-12_300-P-9050093-en Catalog / Data sheet PDF 127.8 KB

Version FD 12-…-2PO (standard)

Version FD 12-…-3PS (on request)

  • Mobile crane 
  • Steering systems