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. For other markets, dezincification-resistant brass is available. The range includes a variant with a stainless steel body. To reduce electrical power consumption during operation, coils with integrated Kick-and-Drop (KD) electronics featuring double coil technology are available. The valve can be supplied with manual operation for easy maintenance and commissioning.

General Technical Data

Product properties
Seal	NBR, EPDM, FKM
Body	Brass acc. to DIN EN 50930-6, stainless steel (dezincification resistant on request)
Inner valve parts	Stainless steel, brass, plastic (PPS)
Orifice	DN 10...DN 50
Duty cycle	100 % continuous operation
Operating voltage	24 V DC, 24 V UC, 24 V 50/60 Hz, 230 V UC, 230 V 50/60 Hz
Voltage tolerance	±10 %
Degree of protection	IP65 with cable plug, cable connection and terminal box
Ambient temperature	Max. +55 °C (Standard variant)

Circuit Functions

Symbol	Description
	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

Approvals and Conformities

• Explosion Protection: ATEX (II 2G Ex mb IIC T4 Gb, II 2D Ex mb IIIC T130 °C Db) / IECEx (Ex mb IIC T4 Gb, Ex mb IIIC T130 °C Db).
• North America: UL Listed for Hazardous Locations, UL Recognized for the USA and Canada, CSA for Canada.
• Drinking Water: Suitable for use in drinking water applications (PF39, PF36).
• Others: DNV GL classification, Suitability for oxygen, VDE Certificate of conformity with factory surveillance.

Materials

No.	Element	Material
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)

Dimensions

Standard Threaded Variant

ATEX/IECEx Cable Variant

Safety Instructions

• Danger from high pressure: Before loosening lines and valves, turn off the pressure and vent the lines.
• Danger due to electrical voltage: Before reaching into the device or the system, switch off the power supply and secure it against reactivation.
• Risk of burns/fire: Keep the device away from highly flammable substances and media and do not touch with bare hands if operated continuously.
• Risk of short circuit/escape of medium: Make sure valve seals are properly seated and carefully screw the valve and pipelines together.