Burkert Type 6281 is a servo-assisted diaphragm valve. A minimum differential pressure is always required for the valve to function. Various diaphragm materials and circuit functions are available depending on the actual application. The standard brass body meets European drinking water requirements, while dezincification-resistant brass and stainless steel variants are also available. To reduce electrical power consumption during operation, coils with integrated Kick-and-Drop (KD) electronics featuring double coil technology can be used. The valve can be supplied with manual operation for easy maintenance and commissioning.

Circuit Functions

• Circuit function A (CF A): 2/2-way solenoid valve, servo-controlled, normally closed.
• Circuit function B (CF B): 2/2-way solenoid valve, servo-controlled, normally open. (Note: SKU 348101 features Circuit Function B).

Technical Data

Property	Value
Orifice	DN 10...DN 50 (SKU 348101: 13 mm)
Body material	Brass acc. to DIN EN 50930-6, stainless steel
Seal material	NBR, EPDM, FKM (SKU 348101: FKM)
Pressure range	0.2...16 bar
Medium temperature	FKM: 0 °C...+120 °C (with epoxy coil)
Ambient temperature	Max. +55 °C
Operating voltage	24 V DC, 24 V UC, 24 V 50/60 Hz, 230 V UC, 230 V 50/60 Hz
Degree of protection	IP65 with cable plug

Materials

1. Coil: Polyamide or epoxy
2. Stopper: Stainless steel 1.4113
3. Shading ring: Cu (brass variant) / Ag (stainless steel variant)
4. Magnetic core: Stainless steel 1.4113
5. O-ring: NBR, FKM, EPDM
6. Core seal: NBR, FKM, EPDM
7. Spring: Stainless steel 1.4310
8. O-ring: NBR, FKM, EPDM
9. Diaphragm: NBR, FKM, EPDM
10. Diaphragm holder: PPSGF40, DN 50: brass and stainless steel
11. Valve body: Brass acc. to DIN EN 50930-6 or stainless steel 1.4408 (CF8M)

Approvals and Conformities

• Explosion Protection: Optional ATEX / IECEx (II 2G Ex mb IIC T4 Gb / II 2D Ex mb IIIC T130 °C Db).
• North America: UL Recognized / UL Listed for Hazardous Locations / CSA approved.
• Drinking Water: Suitable for use in drinking water applications (PF39 / PF36).
• Others: DNV GL classification, Suitability for oxygen.

Installation and Maintenance

Safety Instructions

• High pressure: Before loosening lines and valves, turn off the pressure and vent the lines.
• Electrical voltage: Before reaching into the device or the system, switch off the power supply and secure it against reactivation.
• Hot surface: Keep the device away from highly flammable substances and media and do not touch with bare hands if operated continuously.

Manual Override (Optional)

To manually operate the valve, the hand lever must be turned to a vertical position below the solenoid. Do not over-rotate the hand lever. When the hand lever is actuated, the valve can no longer be switched electrically.

Electrical Connection

Screw the cable plug tight (ensuring a maximum torque of 1 Nm). Check that the valve seal is correctly seated. Connect the protective conductor and check electrical continuity between the solenoid and the body.