BURKERT 351172 Type 6430 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. The 351172 model is an external air controlled variant designed for vacuums up to 8 bar in the normally closed (NC) function. 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.

Features

• Servo-assisted piston valve
• Increased operational safety with pivoted armature technology
• Service-friendly manual override
• External air controlled variant for vacuum applications

Technical Data

Property	Value
Orifice	DN 8
Body material	Brass
Seal material	PUR / NBR
Coil material	Epoxy
Thermal insulation class	Class H
Performance	100% continuous operation
Power consumption	Inrush AC: 30 VA, Hold AC: 15 VA/8 W, DC cold/warm: 11 W/8 W
Operating medium	Neutral gases, compressed air, vacuum (low vacuum)
Medium temperature	0 °C to +80 °C (with NBR/PUR)
Ambient temperature	0 °C to +55 °C
Port connection	G 1/4
Degree of protection	IP65 with cable plug

Circuit Function

Circuit function C (CF C): 3/2-way solenoid valve. Servo-controlled, with auxiliary pilot air, with manual override. Normally closed.

Materials

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

INFO

• Dimensions in mm
• The dimensions A1, B1, E1 and F1 apply to G thread.
• The dimensions A2, B2, E2 and F2 apply to NPT 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	A2	B2	C	D	G	H	J	K	L	M	N	O	P
8	G 1/4	12	NPT 1/4	10	47.5	SW22	SW22	36	30	7	65	46	137.8	33	SW19
12	G 1/2	14	NPT 1/2	13.7	59	SW27	SW32	43	34	7	76	46	162.5	33	SW32
20	G 3/4	16	NPT 3/4	14	81	SW36	SW41	60	48	9	90	63	204	50	SW36

Installation & Maintenance

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.

Before installation:

• Check pipelines for soiling and clean if required.
• Install a dirt trap upstream of the valve inlet (≤ 500 µm).

Installation:

• Any installation position, preferably actuator face up.
• Hold the device on the body using an open-end wrench and screw into the pipeline.
• Observe pin assignment according to switching function and identification.

Manual Override

When manual override is locked, the valve can no longer be electrically actuated.

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 (pilot pressure must be at least 2 bar above operating pressure)

Spare Parts

Pilot control with solenoid (1), wearing part set (2).