The 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

Technical Data

Property	Value
Orifice	DN 10...DN 50
Body material	Brass acc. to DIN EN 50930-6, stainless steel
Seal material	NBR, EPDM, FKM
Pressure range	0.2...16 bar
Medium temperature	-30 °C...+120 °C (depending on seal material)
Duty cycle	100 % continuous operation
Degree of protection	IP65 with cable plug

Circuit Functions

Symbol	Description
CF A	2/2-way solenoid valve, Servo-controlled, Normally closed
CF B	2/2-way solenoid valve, Servo-controlled, Normally open

Approvals and Conformities

The Type 6281 is available with various approvals including ATEX/IECEx (II 2G Ex mb IIC T4 Gb, II 2D Ex mb IIIC T130 °C Db), cULus (UL 429), CSA 139, Drinking water (KTW/W270), and DNV GL classification for ships and offshore units.

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, 8	O-ring	NBR, FKM, EPDM
6	Core seal	NBR, FKM, EPDM
7	Spring	Stainless steel 1.4310
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

Installation and Maintenance

Safety Instructions

• Risk of injury from high pressure in the system. Before loosening lines or valves, switch off the pressure and vent the lines.
• Risk of injury from electric shock. Before reaching into the device or the system, switch off the power supply and secure it against reactivation.

Manual Override (Optional for Type 6281, code HA15/HA17)

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.