Bürkert 309104 Type 6628 is a direct-acting, media-separated 2/2 or 3/2-way rocker solenoid valve designed for the control of aggressive liquids and gases in medical analysis technology, the food industry, and the chemical industry during dosing, filling, mixing, and distribution. The medium is only in contact with the housing and seal material through the separating diaphragm.

With its new TwinPower actuator, robust fitting, and 22 mm width, this valve meets the most stringent requirements. The tried-and-tested rocker technology is characterised by full back pressure tightness, good flushability, and a low internal volume. The Type 6628 is available in a wide variety of technical variants and provides perfect adaption in fluidics application with the aid of various fluidic body options.

General Technical Data

Product properties	Description
Seal material	FFKM, FKM or EPDM
Valve body material	PEEK, PPS or PVDF (PP on request)
Internal volume	Bürkert sub-base: from 280 μl Hose connector: from 500 μl Threaded body: from 500 μl
Orifice	DN 2.0 (Vac...5 bar) DN 3.0 (Vac...3 bar)
Circuit function	A, B and T
Switching time	Opening: approx. 25 ms (pressure build-up 0...10 %) Closing: approx. 25 ms (pressure reduction 100...90 %)
Power supply	12 V DC, 24 V DC (other voltages on request)
Duty cycle	100 % continuous operation
Nominal power	5 W (other powers on request & variants with internal power reduction possible)
Operating medium	Resistant to neutral and aggressive gases and liquids
Medium temperature	FKM: 0 °C...+ 55 °C FFKM: +10 °C...+ 55 °C EPDM: -10 °C...+ 55 °C
Degree of protection	IP54 with cable or cable plug Type 2507 IP30 with rectangular cable plug Type 2505

Product Variants

Rectangular plug with manual override and Bürkert sub-base

Rectangular plug with 2-way hose connector

Flying leads with push-in connector

Circuit Functions

Symbol	Description
CF A	2/2-way solenoid valve, Direct-acting, Normally closed
CF B	2/2-way solenoid valve, Direct-acting, Normally open
CF T	3/2-way solenoid valve, Direct-acting, Flow direction optional, Universal

Approvals and Conformities

Conformity	Description
FDA	FDA – Code of Federal Regulations. All wetted materials are compliant with the Code of Federal Regulations published by the FDA (Food and Drug Administration, USA) according to the manufacturer’s declaration.
USP	United States Pharmacopeial Convention (USP). All wetted materials are biocompatible according to the manufacturer’s declaration.

Material Specifications

No.	Element	Material
1	Fastening screw M3 (from end to end)	Stainless steel
2	Coil	Epoxy
3	Valve body	PPS
4	Diaphragm (Wetted)	FFKM, FKM or EPDM
5	Valve body (Wetted)	PEEK, PPS or PVDF
6	Sub-base seal (Wetted)	FFKM, FKM or EPDM

Dimensions

Sub-base variant with connector plug form B

Safety and Installation

Danger – high pressure

Before loosening lines or valves, switch off the pressure and drain the lines.

Risk of burns or fire

Keep Type 6628 away from highly flammable substances and media, and do not touch with bare hands due to hot device surfaces from prolonged operation. Do not obstruct heat dissipation required for operation.

Fluidic installation

Install dirt trap in the direction of the current before the valve (mesh width 5 μm). Ensure that the seals provided fit properly. Only use manifolds of sufficient quality and with a flat surface.