Under article number 221983 we supply the servo-assisted Burkert diaphragm valve Type 6281 (2/2-way, normally closed (NC)) with stainless steel body, internal thread G1 1/2 and NBR seal in orifice DN 40.
How the Burkert valve Type 6281 DN 40 switches
When de-energised, the flow path from port 1 (P) to port 2 (A) is closed; the valve only opens when the coil is energised. 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 30 m³/h. According to Burkert, this version opens in 150–1500 ms and closes in 200–3500 ms.
Electrical connection and coil
The coil for 24 V DC (32 mm, encapsulated in polyamide) sits on the vibration-proof, centrally screwed coil system. The rated power of the coil is 8 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 A, 2/2-way, normally closed (NC) · Orifice DN 40 · Port connection internal thread G1 1/2 · Pressure range 0.2–16 bar · Kv value water 30 m³/h · Body stainless steel · Seal NBR · Medium temperature -10 °C to +80 °C · Ambient temperature max. +55 °C · Voltage 24 V DC ±10 % · Rated power 8 W · Plug form A · IP65 with cable plug · Duty cycle 100 % · Installation length 126 mm · Weight 2.841 kg
What valve 221983 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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