With orifice DN 12 and a permissible operating pressure of up to 20 bar, the Burkert valve 20118359 from the 6440 series is a servo-assisted piston valve with female thread G 1/2. The Kv value is 2.2 m³/h; without actuation the valve stays closed.
What to check when selecting 20118359
It is connected via a terminal box without fuse; the protection class is IP65. The epoxy coil of size 42 mm operates at 24 V AC/DC. Its integrated kick-and-drop electronics pulls in at 44 W and then holds at 6.5 W. The coil is designed for 100 % duty cycle. The permissible ambient temperature ranges from -40 °C to +70 °C – check this value, as it distinguishes otherwise similar variants.
Design and materials of the Burkert 6440 (20118359)
The body has a female thread G 1/2 at inlet and outlet; the installation length is 55 mm. Body, valve seat, core and stopper are made of stainless steel, the seat seal and the seal towards the outside of EPDM. The core runs in a PTFE sliding ring, which extends service life when switching dry gases. Stopper and core guide tube are welded; Burkert specifies the internal and external leakage rate as 10-4 mbar·l/s. The medium temperature may range from -40 °C to +90 °C.
Using 20118359 in hazardous areas
This version is approved to ATEX and IECEx and intended for hazardous areas of category 2 (zone 1/21). Marking according to the manufacturer: II 2 G Ex mb IIC T4 Gb / II 2 D Ex mb IIIC T130°C Db.
Technical data at a glance
Circuit function A, normally closed · Orifice DN 12 (7/16 inch) · Operating pressure 0–20 bar · Kv value 2.2 m³/h · Connection female thread G 1/2, installation length 55 mm · Body and seat stainless steel · Seal EPDM · Medium temperature -40 to +90 °C · Ambient temperature -40 to +70 °C · 24 V AC/DC · Coil 42 mm, pull-in 44 W / holding 6.5 W · Terminal box, IP65 · Response time opening 20–30 ms, closing 120–200 ms · Approval ATEX and IECEx
Where the piston valve 20118359 is used
Type 6440 is developed as a safety shut-off valve for fuel cell systems and other hydrogen applications, and it also switches neutral gases such as compressed air or nitrogen. Thanks to its Ex approval, it can also be used in hazardous areas. As a dealer listed by Burkert, we source the valve directly from the manufacturer.
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