BURKERT 350472 (Type 6519) is a pilot-operated 5/3-way pneumatic solenoid valve configured with circuit function N, featuring an ematalised (hard anodised) aluminium body designed for extended temperature environments from -30 °C to +80 °C. The valve operates with an internal orifice of DN 9.0 mm and delivers a nominal flow rate QNn of 1500 l/min at 6 bar inlet pressure and 1 bar differential pressure. Pilot control is provided by an integrated Ex mb encapsulated solenoid coil with a permanently attached 3 m moulded connection cable, certified for use in potentially explosive atmospheres under ATEX and IECEx standards for temperature class T5.

In circuit function N, the de-energised central position closes pressure supply port 1 while venting both working ports 2 and 4 to exhaust ports 3 and 5, enabling safe depressurisation of connected double-acting actuators. Manual override is integrated as standard for commissioning and testing without electrical power. The valve assembly includes a stainless steel dome nut on the exhaust port to protect internal passages from moisture ingress and operates within a working pressure range of 2.5 to 10 bar (nominal 3 to 10 bar).

Circuit Function and Operating Principle

Type 6519 pneumatic valves operate without continuous air consumption in static positions. The pilot control actuates an internal slide mechanism, combining a pneumatic spring and a mechanical return spring to establish reliable return to the central position upon de-energisation.

• Circuit Function N (CF N): 5/3-way solenoid valve, servo-controlled with manual override. In the middle de-energised position, supply port 1 is blocked, and working ports 2 and 4 are exhausted via ports 3 and 5.
• Manual Override Operation: to override the valve manually, press the manual override actuator and turn it 90° clockwise until it reaches the end stop. The manual override must only be actuated when electrical power is disconnected.
• Dynamic Response: opening time is 16 ms (pressure build-up 0 to 10%), and closing time is 22 ms (pressure drop 100 to 90%), measured at +20 °C and 6 bar operating pressure.

INFO

Type 6519 valves feature internal slide construction for 5/3-way functions, operating without constant air consumption and delivering high flow efficiency in pneumatic actuator control circuits.

Technical Specifications

Parameter	Specification
Article Number	350472
Valve Type	Type 6519
Circuit Function	N (5/3-way, de-energised middle position ports 2 and 4 exhausted)
Orifice Size	DN 9.0 mm (pilot control orifice 1.2 mm)
Flow Rate QNn (Air)	1500 l/min (measured at +20 °C, 6 bar inlet, 1 bar pressure drop)
Operating Pressure Range	2.5 to 10 bar (nominal pressure 3 to 10 bar gauge)
Operating Voltage	24 V UC (AC/DC, 50/60 Hz, rated 24 V, tolerance ±10%)
Power Consumption	2 W nominal (warm coil hold: 3 W DC)
Duty Cycle	100% ED continuous operation
Switching Times	Opening: 16 ms, Closing: 22 ms
Medium Temperature	-30 °C to +80 °C
Ambient Temperature	-40 °C to +60 °C
Operating Medium	Neutral media, dry lubricated or non-lubricated compressed air
Compressed Air Quality	ISO 8573-1:2010 Class 7.2.4
Main Valve Body Material	Hard anodised (ematalised) aluminium
Pilot Valve Body Material	Stainless steel
Seal Material	FKM and NBR
Pneumatic Port Connections	Ports 1, 3, 5: G 1/4 (flange-mountable FM02); Ports 2, 4: G 1/4; Pilot port: M5
Electrical Connection	3 m permanently moulded cable, 3-wire
Explosion Protection	ATEX / IECEx II 2G Ex mb IIC T5 Gb, II 2D Ex mb IIIC T95 °C Db
Degree of Protection	IP65
Weight	1060 g

Explosion Protection and Electrical Connection

BURKERT 350472 is fitted with an encapsulated AC10 push-over solenoid coil certified according to ATEX and IECEx regulations for installation in hazardous areas.

• EC-Type Examination Certificate: EPS 18 ATEX 1 232 X
• IECEx Certificate: IECEx EPS 18.0110X
• Ex Marking: II 2G Ex mb IIC T5 Gb / II 2D Ex mb IIIC T95 °C Db (single mounting)

Coil Size	A [mm]	B [mm]	C [mm]	D [mm]	E [mm]	F [mm]
Size 5 (32 mm)	32	20.5	46	66.8	99.8	174.7
Size 6 (40 mm)	40	23.5	52	74.8	102.8	177.7

Temperature Limits for Ex Operation

The maximum medium temperature must never exceed the permitted temperature class minus 5 K (for temperature class T5: +100 °C − 5 K = +95 °C). The maximum permitted medium temperature for article 350472 is +80 °C.

The permanently potted cable is constructed from polyolefin insulation material suitable for fixed installation from -55 °C to +145 °C with a minimum bending radius of 4 times the cable outer diameter (6.2 mm). Wiring assignments are:

• Green-Yellow: Protective Earth (PE)
• Black: Neutral conductor / Cathode (−)
• Black: Phase conductor / Anode (+)

All metallic components of the valve body and solenoid coil share electrical continuity. The protective earth conductor must be connected to provide electrostatic grounding.

Dimensional Data and Installation

BURKERT 350472 is designed with 32 mm width geometry for mounting as a single unit or within modular manifold assemblies.

Version / Function	Body Material	A [mm]	B [mm]	D (Ex mb) [mm]	E (Ex mb) [mm]	H (Ex mb) [mm]
Function H (5/2-way)	Aluminium	43.5	97.0	35.0	45.0	167.8
Function H (5/2-way)	Stainless steel	53.5	107.0	35.0	45.0	177.8
Function Z, L, N (5/3-way)	Aluminium	53.5	107.0	35.0	45.0	148.6
Function Z, L, N (5/3-way)	Stainless steel	53.5	107.0	35.0	45.0	248.6

Port Tightening Torques and Assembly Rules

• Direct Mounting: secure the valve body to the wall or mounting bracket using M4 screws with a tightening torque between min. 2 Nm and max. 5 Nm.
• Port G 1/4 Connections: recommended tightening torque is 4 to 7 Nm (maximum allowable tightening torque is 20 Nm).
• Auxiliary Pilot Port M5: recommended tightening torque is 1.0 to 1.2 Nm (maximum allowable is 3 Nm).
• Solenoid Retaining Nut: tighten the coil fixing nut using an open-end wrench to a maximum tightening torque of 5 Nm. The coil can be rotated in 4 × 90° positions (or 2 × 180° on manifold blocks).

Upstream Filtration Requirement

Install a dirt trap or particulate filter (filtration rating ≤ 500 µm) upstream of port 1 within 500 mm. To prevent internal freezing of expanded compressed air at low temperatures, ensure the pressure dew point is at least 10 K lower than the medium temperature.

Modular Pneumatic Rail and Manifold Assembly

Type 6519 valves can be installed onto MP07 modular pneumatic base rails to create compact valve blocks with common pressure supply and exhaust lines.

Item	Description
1	Left connection module (G 1/2)
2	3-fold base module for pneumatic block assembly
3	Intermediate module (additional pressure feed) or right module (zone separation)
4	2-fold base module for pneumatic block assembly
5	Right connection module (G 1/2)
6	Supply connection 3(R) exhaust port
7	Supply connection 1(P) pressure port
8	Supply connection 5(S) exhaust port
9	Blanking plate for unused valve positions

Extended Temperature Range Ex mb Variants

The following table lists related Type 6519 extended temperature range aluminium valves equipped with 3 m potted Ex mb cable coils (temperature class T5) sharing the same mechanical envelope:

Circuit Function	Orifice [mm]	Flow QNn [l/min]	Voltage	Power [W]	Pressure Range [bar]	Seal Material	Weight [g]	Article Number
CF H (5/2-way)	9.0	1800	24 V UC	2	2.5 to 10	FKM, NBR	680	350466
CF Z (5/2-way impulse)	9.0	2100	24 V DC	2	2.5 to 10	FKM, NBR	990	350500
CF N (5/3-way center exhaust)	9.0	1500	24 V DC/UC	2	2.5 to 10	FKM, NBR	1060	350472