BURKERT 388748 (Type 6281) is a servo-assisted 2/2-way diaphragm solenoid 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, and dezincification-resistant brass or stainless steel variants are available. To reduce electrical power consumption during operation, coils with integrated Kick-and-Drop (KD) electronics featuring double coil technology can be used.

Key Features

• 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 available (ATEX/IECEx)

Circuit Functions

Symbol	Description
	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

Note on Circuit Function B

Special instructions for valves circuit function B (NO) with exhaust port G1/8 on the solenoid (CF05/MX62): 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.

Approvals and Conformities

• Explosion Protection: ATEX (II 2G Ex mb IIC T4 Gb, II 2D Ex mb IIIC T130 °C Db) and IECEx.
• North America: UL Listed for Hazardous Locations, UL Recognized, CSA approved.
• Drinking Water: Suitable for use in drinking water applications (KTW and W270).
• DNV GL: Accepted for installation on all vessels classed by DNV GL.
• Oxygen: Optional suitability for gaseous oxygen.

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)

Dimension Notes

• 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.

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 and ensure a controlled restart after installation.