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

Product properties
Dimensions	See dimensions section
Material
Seal	NBR, EPDM, FKM
Body	Brass acc. to DIN EN 50930-6, stainless steel
Inner valve parts	Stainless steel, brass, plastic (PPS)
Orifice	DN 10...DN 50
Performance data
Duty cycle	100 % continuous operation
Switching time	Opening: 0.1...1.5 s, Closing: 0.2...4 s
Electrical data
Operating voltage	24 V DC, 24 V UC, 24 V 50/60 Hz, 230 V UC, 230 V 50/60 Hz
Voltage tolerance	±10 %
Medium data
Operating medium	Medium that does not attack the housing and sealing materials
Medium temperature	With NBR: -10 °C...+80 °C With EPDM: -30 °C...+90 °C With FKM: 0 °C...+90 °C

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.

Special instructions for valves circuit function B (NO)

The valve is open when there is no power. The medium also flows out via the exhaust port on the solenoid. Valves of this type are therefore only suitable for compressor relief.

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

Note

Dimensions in mm. The dimensions F1 and G1 apply to G thread. The dimensions F2 and G2 apply to NPT thread. The dimensions F3 and G3 apply to Rc thread.

Installation & Safety

Risk of injury from high pressure

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. Observe the applicable accident prevention and safety regulations for electrical devices.

Before installation:

• Clean pipelines of any contamination.
• Install a dirt trap upstream of the valve inlet (≤ 500 µm).
• Installation position: any, preferably with actuator on top.

Installation:

• Do not use the solenoid as a lever arm.
• Hold the device on the body using an open-end wrench and screw into the pipeline.
• Observe the flow direction: the arrow on the body indicates the flow direction.