BURKERT Type 6430 (Article 357627) is a servo-assisted 3/2-way piston valve. This specific model is a vacuum variant designed for technical vacuums up to 3 bar in the normally open (Circuit Function D) configuration. It features a G 1/4 port connection, an 8.00 mm orifice, a brass body, and NBR seals. The valve is equipped with a manual override for start-up or manual operation. 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 valve satisfies degree of protection IP65.

General Technical Data

Product properties
Material
Seal	NBR
Body	Brass
Coil	Epoxy
Orifice	DN 8
Circuit function	D (Normally open)
Thermal insulation class	Epoxy coil class H
Performance data
Duty cycle	100% continuous operation
Switching time (DN 8)	Opening: 25 ms, Closing: 30 ms
Electrical data
Power consumption	Inrush AC: 30 VA, Hold AC: 15 VA/8 W, DC cold/warm: 11 W/8 W
Voltage tolerance	±10%
Medium data
Operating medium	Neutral gases, compressed air, vacuum (low vacuum)
Medium temperature	0 °C to +80 °C (with NBR)
Viscosity	Max. 21 mm²/s (21 cSt)
Product connections
Electrical connection	Plug contacts according to DIN EN 175 301-803 form A
Port connection	G 1/4
Environment and installation
Installation position	As required, preferably with actuator upright
Ambient temperature	0 °C to +55 °C

Circuit Functions

Symbol	Description
	Circuit function D (CF D) 3/2-way solenoid valve Servo-controlled, with manual override Normally open

Material Specifications

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

Dimensions

Note

• Dimensions in mm
• The dimensions A1, B1, E1 and F1 apply to G thread.
• The figure shows the valve in circuit function C with ports P, R and A/B (manual override via port P). In circuit function D, the manual override is located above port A/B.

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

Installation and Safety

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. Always connect protective conductor and check electrical continuity between solenoid and body.

Installation Recommendations

• 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.

Ordering Information

Vacuum Variant

• Circuit function: CF D (Normally open)
• Port connection: G 1/4
• Orifice: 8 mm
• Kv value water: 0.95 m³/h
• Pressure range: Vacuum up to 3 bar
• Weight: 0.9 kg
• Voltage/Frequency: 024/DC
• Article no.: 357627

INFO

A minimum differential pressure of 0.5 bar is required for switching. The vacuum variant is only suitable for rough vacuum (atmospheric pressure (1013 hPa) to 100 Pa (1 mbar)).