Under article number 241046 we supply the servo-assisted Burkert diaphragm valve Type 6281 (2/2-way, normally open (NO)) with brass body, internal thread G3/4 and NBR seal in orifice DN 20.
How the Burkert valve Type 6281 DN 20 switches
When de-energised, the flow path from port 1 (P) to port 2 (A) is open; energising the coil closes the valve. As a servo-assisted diaphragm valve, Type 6281 uses the medium pressure to switch. A minimum differential pressure of 0.2 bar is required, and according to the data sheet 0.5 bar to open the full cross-section; the pressure range of this version extends to 16 bar. The valve closes with damping and operates quietly. The Kv value for water is 8.5 m³/h. According to Burkert, this version opens in 120–1000 ms and closes in 150–3000 ms.
Electrical connection and coil
The coil for 110 V AC 50/60 Hz (40 mm, encapsulated in epoxy resin) sits on the vibration-proof, centrally screwed coil system. The AC coil draws 30 VA at switch-on and 24 VA in holding mode; the rated power is 9 W. It is connected via plug contacts to DIN EN 175301-803 form A; with a cable plug, the valve achieves IP65. The cable plug Type 2518 is not included and available separately.
Technical data at a glance
Circuit function B, 2/2-way, normally open (NO) · Orifice DN 20 · Port connection internal thread G3/4 · Pressure range 0.2–16 bar · Kv value water 8.5 m³/h · Body brass · Seal NBR · Medium temperature -10 °C to +80 °C · Ambient temperature max. +55 °C · Voltage 110 V AC 50/60 Hz ±10 % · Rated power 9 W · Plug form A · IP65 with cable plug · Duty cycle 100 % · Installation length 80 mm · Weight 0.965 kg
What valve 241046 is suited for
According to the data sheet, it switches media that do not attack the body and seal materials. It can be installed in any position, preferably with the actuator facing up. As a dealer listed by Burkert, we source the valve directly from the manufacturer.
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