BURKERT 20047711 (Type 6281) is a servo-assisted 2/2-way diaphragm valve. A minimum differential pressure is always required for the valve to function. This specific model features a stainless steel body, EPDM seals, and an ATEX/IECEx approved terminal box for use in hazardous locations. The valve is designed with a vibration-resistant, centrally screwed coil system and a damped design for quiet closing.

Key Features

• Servo-assisted diaphragm valve up to DN 50
• Vibration-resistant, centrally screwed coil system
• Damped design for quiet closing
• Explosion-proof ATEX/IECEx variant
• Stainless steel body with G1 internal thread

Circuit Function

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

Approvals and Conformities

This model is equipped with explosion protection approvals:

• 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)

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 (ATEX/IECEx Terminal Box Variant)

INFO

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

Coil size	H	J	K	P	R	S
5	32	20.5	46	68.8	99.8	174.7
6	40	23.5	52	74.8	103	177.7

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 Instructions

DANGER!

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

WARNING!

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.
• 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 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.