BURKERT 20079457 Type 6281 is a servo-assisted 2/2-way diaphragm valve. A minimum differential pressure is always required for the valve to function. The standard brass body meets European drinking water requirements. The valve features a vibration-resistant, centrally screwed coil system and a damped design for quiet closing.

Circuit Function

Circuit function A (CF A) 2/2-way solenoid valve, servo-controlled, normally closed.

Material Specifications

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

INFO

Dimensions in mm. The dimensions F1 and G1 apply to G thread.

Type Label

1 Type	2 Circuit function
3 Orifice	4 Sealing material
5 Body material	6 PN
7 Connection type	8 Power
9 Frequency	10 Voltage
11 Manufacture code	12 Article number

Installation and 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.

Maintenance and Troubleshooting

Overheating, risk of fire

Connecting the solenoid without a pre-installed valve will cause overheating and destroy the solenoid. Only connect the solenoid after the valve has been installed.

Solenoid installation approach:

1. Slide solenoid housing onto core guide tube.
2. Screw solenoid with nut. Observe tightening torques (5 Nm for 32 mm or 40 mm solenoid width).
3. Always tighten nut with an open-end wrench. Using other tools may damage the device.
4. Check protective conductor.

Troubleshooting: If the valve does not actuate, check for a short circuit or interrupted solenoid, core contamination, or operating pressure outside the permitted range. If the valve does not close, check for interior contamination, a blocked control bore in the diaphragm, or if the valve was opened by manual override.