BURKERT 349759 Type 6281 is a servo-assisted 2/2-way diaphragm valve designed for controlling, shutting off, and dosing neutral media. This specific model features a brass body, G 1 1/2 internal thread, NBR seal, and operates at 230V (50/60 Hz). It is equipped with an ATEX/IECEx approved terminal box without a fuse, making it highly suitable for hazardous locations.

A minimum differential pressure is always required for the valve to function. The standard brass body meets European drinking water requirements. To reduce electrical power consumption during operation, coils with integrated Kick-and-Drop (KD) electronics featuring double coil technology are available within the Type 6281 family.

General Technical Data

Property	Description
Seal Material	NBR
Body Material	Brass acc. to DIN EN 50930-6
Inner Valve Parts	Stainless steel, brass, plastic (PPS)
Orifice	40 mm (DN 40)
Duty Cycle	100 % continuous operation
Voltage Tolerance	±10 %
Degree of Protection	IP65 with terminal box
Installation	As required, preferably with actuator upright

Circuit Functions

Symbol	Description
	Circuit function A (CF A) 2/2-way solenoid valve Servo-controlled Normally closed

Approvals and Conformities

Explosion Protection (ATEX/IECEx)

• ATEX: EPS 18 ATEX 1232 X (II 2G Ex mb IIC T4 Gb / II 2D Ex mb IIIC T130 °C Db)
• IECEx: IECEx EPS 18.0110 X (Ex mb IIC T4 Gb / Ex mb IIIC T130 °C Db)

Note on Hazardous Locations

The maximum medium temperature must never exceed the permitted temperature class (T4: +135 °C, T5: +100 °C, T6: +85 °C) minus 5 K.

Materials

No.	Element	Material
1	Coil	Polyamide or epoxy
2	Stopper	Stainless steel 1.4113
3	Shading ring	Cu (brass variant)
4	Magnetic core	Stainless steel 1.4113
5	O-ring	NBR
6	Core seal	NBR
7	Spring	Stainless steel 1.4310
8	O-ring	NBR
9	Diaphragm	NBR
10	Diaphragm holder	PPSGF40
11	Valve body	Brass acc. to DIN EN 50930-6

Dimensions (ATEX/IECEx Terminal Box Variant)

Dimension Notes

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

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.

Risk of injury due to improper installation

Installation must be carried out by authorised technicians only and with the appropriate tools. Secure the system against unintentional activation and ensure a controlled restart after installation.

Before Installation:

• Clean pipelines of any contamination.
• Install a dirt trap upstream of the valve inlet (≤ 500 µm).

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.