NPT 1 inch Brass 24VDC 2-Way Proportional Integrated Positioner Disc Valve 3285 278405
USD $760.50

NPT 1 inch Brass 24VDC 2-Way Proportional Integrated Positioner Disc Valve 3285 278405

NPT 1 inch Brass 24VDC...
NPT 1 inch Brass 24VDC...
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Bürkert 2/2-way disc valve (type 3285) with NPT 1 inch female threaded ports. Designed for proportional flow control with an integrated positioner module. For media temperature ranging from 0 to 70°C (32 to 158°F) at a differential pressure of 0 to 6 bar (0 to 87 psi). Housing of brass with oxide ceramics/FKM sealing and a 25 mm orifice. The Kv-value is 9.6 m3/h. The valve is electrically actuated with a 24 V DC supply voltage, controlled through a 4-20 mA input signal and uses fieldbus buS as a parametrization protocol. The integrated electronics give an output (feedback) 4-20 mA signal.

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USD $760.50

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This Bürkert proportional control valve has an integrated positioner. This means that the valve automatically controls the opening rate to reach a set-point position value. A 4-20 mA input must be used for set-point value. The valve's position can be monitored by a 4-20 mA output. Furthermore, this version uses a fieldbus (büS) communications protocol for parametrization. This ‘positioner’ version does not include a controller to optimize for an external process value such as a temperature (see ‘process control’ version).

The 2-way valve has Inner thread conical (NPT) 1/2 inch female threads and an internal orifice of 25 mm. This results in a Kv-value of 9.6 m3/h (Cv value 11.0976 GPM). Use our Kv-calculator to determine the optimal Kv-value for your pressure and flow rate.

The Bürkert 3285 valve has two oxide ceramic discs that both have an opening. By sliding one disc over the other, the degree of overlap of the holes can be varied and thus the opening of the valve. The disc position is actuated by a stepper motor and holds a position with minimal power loss. This makes this valve highly energy efficient.

The valve is electrically operated with a 24 V DC supply voltage. The electrical connection on the actuator is an 8-pin male M12 plug.

It can be used for media temperatures from 0 to 70°C (32 to 158°F) at a pressure of 0 to 6 bar (0 to 87 psi). The housing is made of brass and it has oxide ceramics/FKM sealing. 

The valve takes 4 seconds to go from fully open to fully closed position. The flow goes above the seat. They are suitable for control of clean media that doesn’t react with the housing and seal materials. The environment temperature ranges from -10 to 60°C. Please consult the instruction manual to find the proper duty cycle within the temperature range.


  • Fast response time
  • Equipped with an integrated positioner
  • Uses a fieldbus (büS) protocol as a parametrization interface
  • The actuator features an energy-saving function
  • LED display indicates the position of the valve


  • Sensitive to dirt, so a filter should be applied upstream (≤ 0.3 mm)

3285 series

The Burkert series 3285 is designed for controlling the flow rate of liquid and gaseous media. Only clean, liquid or gaseous medium, which does not react with the bodies and sealing materials, may be controlled. The valve uses a ceramic disc to change the size of the orifice which are available in sizes from 8 to 25 mm. There are two discs, one acts as valve’s seat and doesn’t move, while the other rotates and changes the orifice diameter. These are suitable for operating pressure ranging from 0 to 6 bar (0 to 87 psi) and media temperature ranging from 0 to 70 °C (32 to 158 °F). Type 3285 is available as a standard ON/OFF or proportional valve, as a version with integrated positioner and as a version with integrated process controller. These control valves are available in stainless steel and brass design.


Manual 3280 and 3285 pdf Download save_alt
Disc Control Valves 3285 pdf Download save_alt


  • Connection sizeinfo
    1/2 inch
  • Voltageinfo
    24 V DC
  • Materialinfo
  • Control valve version
    Position controller
  • Max pressure (bar)info
  • Control signalinfo
    4-20 mA
  • Communications protocol
    Fieldbus (büS)
  • Burkert valve version
    Position controller
  • Connection type
    Inner thread conical (NPT)
  • Kv value (m3/h)info
  • Operating time (s)
  • Max temperature (°C)
  • Min temperature (°C)
  • Position feedback
  • Position reporting signal
    4-20 mA
  • Valve bore (mm)
  • Degree of protection (IP)
  • Ambient temperature (°C)
    -10 °C to 60 °C