Burkert Type 6430 (SKU 351181) is a servo-assisted 3/2-way piston valve. If the valve is not supplied with auxiliary pilot air, a minimum differential pressure is required for the function. Variants are available for neutral liquids and gases in the pressure range 1-16 bar, for technical vacuums up to 3 bar, and with auxiliary pilot air for vacuums up to 8 bar. All variants are available as an impulse variant to secure the switching position even in the event of power interruptions.

The Type 6430 is equipped with a manual override for start-up or manual operation (exception: impulse variant). To reduce electrical power consumption during operation, coils with integrated "Kick and Drop" (KD) electronics featuring double coil technology are available. A maintenance-free, media-separated 3/2-way pivoted armature valve Type 0331 is used as a pilot valve. In combination with a plug to DIN EN 175301-803 Form A, the valves satisfy degree of protection IP65.

General Technical Data

Product Properties	Specification
Material
Seal	NBR, PUR, FKM, (EPDM on request)
Body	Brass (DN 8...DN 20), gunmetal (DN 25...DN 40)
Coil	Epoxy
Orifice	DN 8, DN 12, DN 20, DN 25, DN 40
Circuit function	C and D
Thermal insulation class	Epoxy coil class H
Performance Data
Duty cycle	100% continuous operation
Electrical Data
Power consumption (Standard)	Inrush AC: 30 VA, Hold AC: 15 VA/8 W, DC cold/warm: 11 W/8 W
Voltage tolerance	±10%
Medium Data
Operating medium (Standard)	Neutral gases and liquids (e.g. compressed air, water, low-viscosity oils)
Operating medium (Vacuum/Ext. Air)	Neutral gases, compressed air, vacuum (low vacuum)
Viscosity	Max. 21 mm²/s (21 cSt)
Environment and Installation
Installation position	As required, preferably with actuator upright
Ambient temperature	0 °C...+ 55 °C (- 20 °C...+ 55 °C for EPDM)

Circuit Functions

Symbol	Description
	Circuit function C (CF C) 3/2-way solenoid valve Servo-controlled, with manual override Normally closed
	Circuit function C (CF C) 3/2-way impulse solenoid valve Servo-controlled
	Circuit function C (CF C) 3/2-way solenoid valve Servo-controlled, with auxiliary pilot air, with manual override Normally closed
	Circuit function D (CF D) 3/2-way solenoid valve Servo-controlled, with manual override Normally open
	Circuit function D (CF D) 3/2-way solenoid valve Servo-controlled, with auxiliary pilot air, with manual override Normally open

Approvals and Conformities

• Explosion Protection (Optional): ATEX/IECEx according to category 2 (zone 1/21).
• North America (Optional): UL Recognized for the USA and Canada (UL 429, CAN/CSA-C22.2 No. 139). UL Listed for Hazardous Locations (Class I, Zone 1; Class I, Division 2, Group A, B, C and D; Class II + III, Division 2, Group F and G).
• FM (Factory Mutual) (Optional): Explosion Protection for USA and Canada.

Materials

Standard and Vacuum Variant

No.	Element	Material
1	Coil	Epoxy
2	O-ring	NBR, FKM, EPDM
3	Spring (Vacuum only)	Stainless steel 1.4310
4	Piston ring	PTFE
5	Housing	Brass, gunmetal
6	Seat seal	NBR, PUR, FKM, EPDM
7	Piston seal	NBR, FKM, EPDM
8	Seal	NBR, FKM, EPDM
9	Diaphragm	NBR, FKM, EPDM
10	Manual override	PA

External Air Controlled Variant

No.	Element	Material
1	Coil	Epoxy
2	O-ring	NBR, FKM, EPDM
3	Piston ring	PTFE
4	Housing	Brass, gunmetal
5	Spring	Stainless steel 1.4310
6	Seat seal	NBR, PUR, FKM, EPDM
7	Piston seal	NBR, FKM, EPDM
8	Seal	NBR, FKM, EPDM
9	Diaphragm	NBR, FKM, EPDM
10	Manual override	PA

Dimensions

Standard and Vacuum Variant

DN	A1	B1	C	D	E1	F1	G	H	J	K	L	M	N	O
8	G 1/4	12	34.5	SW22	G 3/8	12	SW22	23	30	7	65	46	124.8	33
12	G 1/2	14	47	SW27	G 3/4	16	SW32	31	34	7	76	46	150.5	33
20	G 3/4	16	63	SW36	G 1	18	SW41	42	48	9	90	63	186	50
25	G 1	18	74.5	SW41	G 1 1/4	20	54	44	66	9	110	82	210.5	60
40	G 1 1/2	22.5	104	SW55	G 2	26.5	78	65	93	13	153	117	264	88

External Air Controlled Variant

DN	A1	B1	C	D	G	H	J	K	L	M	N	O	P
8	G 1/4	12	47.5	SW22	SW22	36	30	7	65	46	137.8	33	SW19
12	G 1/2	14	59	SW27	SW32	43	34	7	76	46	162.5	33	SW32
20	G 3/4	16	81	SW36	SW41	60	48	9	90	63	204	50	SW36

Installation and Maintenance

Danger

Risk of injury from high pressure. Before loosening lines and valves, switch off the pressure! Vent or empty the lines. Risk of injury due to electric shock. Before working on the device or system, switch off the power supply. Secure against reactivation.

Installation Note

• Check pipelines for soiling and clean if required.
• Install a dirt trap upstream of the valve inlet (≤ 500 µm).
• Ensure that the valve body is not installed twisted.
• Do not use the solenoid as a lever arm.

Electrical Connection of Pulse Valve (CF02)

• Connect pulse valves as shown in the circuit diagram. Pulse on Terminal 1 closes the valve, pulse on Terminal 2 opens the valve.
• Avoid pulses from being simultaneously generated on both coil windings.
• Other consumers (e.g. relays) must not be switched parallel to the terminals.

Troubleshooting

Valve does not switch

• Short-circuit or coil interrupted
• Inadequate power supply
• Interior of the valve soiled
• Medium pressure outside the permitted pressure range
• Manual override locked
• Not enough differential pressure available
• The volume is not adequate

Valve does not close

• Interior of the valve soiled
• Manual override locked
• Not enough differential pressure available
• The volume is not adequate