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.

• Servo-assisted diaphragm valve up to DN 50
• Vibration-resistant, centrally screwed coil system
• Damped design for quiet closing
• Energy-saving double coil technology with kick and drop variant
• Explosion-proof variants

General Technical Data

Property	Value
Orifice	DN 10...DN 50
Body material	Brass acc. to DIN EN 50930 - 6, stainless steel (dezincification resistant on request)
Seal material	NBR, EPDM, FKM
Inner valve parts	Stainless steel, brass, plastic (PPS)
Duty cycle	100 % continuous operation
Switching time	Opening: 0.1...1.5 s, Closing: 0.2...4 s
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

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.

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 Variant (Threaded)

Flange Variant according to DIN EN 1092-1

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. Observe the applicable accident prevention and safety regulations for electrical devices.
• Risk of burns/fire: Keep the device away from highly flammable substances and media and do not touch with bare hands if operated continuously.