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    • Main Office
      Burkert Contromatic Australia Pty. Limited
      15 Columbia Way
      Norwest Business Park
      Baulkham Hills, NSW 2153

      PO Box 6524
      Baulkham Hills NSW 2153
      Phone +61 1300 888 868
      Fax +61 1300 888 076
      E-Mail fnyrf.nh@ohexreg.pbz
    • Office
      South Australia
      Innovation House
      First Avenue
      Mawson Lakes SA 5095

      E-Mail fnyrf.nh@ohexreg.pbz
    • Office
      Bürkert Perth
      Unit 8, 1st Floor
      85 Reid Promenade
      Joondalup WA 6027

      E-Mail fnyrf.nh@ohexreg.pbz
    • Office
      Bürkert Brisbane
      Unit 5a, 88 Brandl Street
      Brisbane Technology Park
      Eight Mile Plains QLD 4113

      E-Mail fnyrf.nh@ohexreg.pbz
    • Office
      Bürkert Melbourne
      Suite 49, UniPark
      Building 4, 195 Wellington Road
      Clayton VIC 3168

      E-Mail fnyrf.nh@ohexreg.pbz
    • Office
      Bürkert Sydney
      15 Columbia Way
      Norwest Business Park
      Baulkham Hills NSW 2153

      E-Mail fnyrf.nh@ohexreg.pbz
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We make ideas flow.

Proportional valves

Switching solenoid valves, which are normally closed, form the basis for Bürkert proportional valves. Making constructive modifications to switching solenoid valves can achieve a balance of the spring and magnetic force for any coil current. The level of the coil current and magnetic force determines the stroke of the plunger or the valve opening, whereby the valve opening and the current are ideally linked by a linear dependence.

Servo-assisted proportional valve
The Figure shows the operating principle of such a valve. When it is closed, the medium at the input side has a pressure of p1, the core or plunger (3) has dropped out and therefore presses on the pilot seat (4). As a result of this and the force of the piston spring, which acts on the piston (2), the main seat (5) is closed. A restrictor port (6) allows the medium to enter the control chamber (1) and press on the diaphragm or gasket from above with a pressure px.
If the restrictor port, pilot seat and area ratios on the main stage are rated accordingly, the compression forces on the piston reach equilibrium when the seat is opened by a certain position. With proportional pilot control, ideally, the piston follows the continuous axial movement of the plunger precisely at the distance that creates this equilibrium.

Diagram of a servo-assisted proportional valve

Direct acting proportional valve

1 Valve body, brass or stainless steel
2 Plunger, FKM (standard)
3 O-ring, FKM (standard)
4 Glide ring, PTFE compound
5 Return spring, stainless steel
6 Stopper with integrated adjusting screw, stainless steel
7 Plunger, stainless steel
8 Coil, Epoxy-encapsulated