BURKERT 20033682 (Type 6027) is a direct-acting 2/2-way normally closed (NC) solenoid plunger valve engineered for demanding neutral, slightly aggressive, and gaseous fluids up to 25 bar. The unit features an investment cast stainless steel 1.4404 (316L) body with G 1/4 internal thread ports, a 4.0 mm nominal orifice, and an overall face-to-face length of 55 mm. To achieve high operational pressure containment and vacuum leaktightness, the stopper and armature guide tube are welded together into a single hermetic assembly.

Operating directly without differential pressure from 0.00 bar to 25.00 bar, Burkert 20033682 delivers a Kv flow capacity of 0.54 m³/h. Media containment relies on a wear-resistant PTFE seat seal combined with external PEEK sealing elements, enabling medium temperatures between -40 °C and +140 °C. The valve incorporates an encapsulated AC10/AC19 explosion-proof coil with integrated Kick and Drop double-coil electronics, supplied by 230–240 V AC (50/60 Hz) and connected via a 3,000 mm factory-moulded polyolefin cable.

Technical Specifications

Parameter	Specification
Model / Order Number	20033682
Valve Type	6027
Circuit Function	A (2/2-way, normally closed, inlet port 1 P/NC)
Orifice Size (DN)	4.0 mm (5/32")
Kv Value (Water)	0.54 m³/h
Pressure Range	0.00–25.00 bar (gas and liquid)
Port Connection	Internal thread G 1/4
Installation Length	55 mm
Body Material	Stainless steel 1.4404 / 316L (CF3M)
Seat Seal Material	PTFE (Polytetrafluoroethylene)
External Seal Material	PEEK (Polyetheretherketone)
Medium Temperature	-40 °C to +140 °C
Ambient Temperature	-40 °C to +70 °C (with Kick and Drop coil)
Nominal Voltage	230–240 V AC, 50/60 Hz (tolerance ±10%)
Inrush Power (Kick)	44 W (500 ms)
Holding Power (Drop)	6.5 W cold / 5.5 W warm
Thermal Insulation Class	Class H (epoxy moulded)
Duty Cycle	100% ED continuous operation
Switching Time (Opening)	10–30 ms
Switching Time (Closing)	50–80 ms
Electrical Connection	Moulded 3-wire cable, length 3,000 mm (3x0.5 mm²)
Protection Degree	IP65
Explosion Protection	ATEX / IECEx Ex mb (Zone 1/21)

Operating Principle and Circuit Function

Burkert 20033682 operates according to Circuit Function A (normally closed in de-energized position). When de-energized, the internal compression spring acts directly on the plunger, driving the PTFE pendulum seal onto the stainless steel valve seat to shut off line flow from port 1 (P) to port 2 (A). Flow direction enters above the seat.

When energized with 230–240 V AC, the integrated electronic circuit activates the high-power inrush winding (44 W for 500 ms), generating magnetic force sufficient to lift the core against system backpressure up to 25 bar. The electronics then immediately switch to the low-power hold winding (6.5 W), sustaining the open state while minimizing electrical power draw and internal heat dissipation. If electrical power is interrupted, the return spring immediately pushes the plunger back onto the orifice seat within 50 to 80 ms.

Materials of Construction

The physical construction of Burkert 20033682 incorporates materials selected for mechanical fatigue resistance and wide chemical compatibility across liquid and gaseous media:

Item No.	Component	Material
1	Retaining Nut	Thick-film passivated steel (DIN 176) or stainless steel
2	Solenoid Coil	Chemically resistant epoxy resin
3	Stopper	Stainless steel 1.4113 (AISI 434)
4	Shading Ring	Silver (stainless steel body configuration)
5	Plunger Return Spring	Stainless steel 1.4310 (AISI 301)
6	Plunger / Core	Stainless steel 1.4113 (AISI 434)
7	Plunger Guide Tube	Stainless steel 1.4303 / AISI 305 / 308 (welded to stopper)
8	Lower Guide Spring	Stainless steel 1.4310 (AISI 301)
9	External Seal	PEEK / FKM
10	Valve Seat Seal	PTFE (pendulum seal design)
11	Valve Body	Stainless steel 1.4404 / AISI 316L (CF3M)

Dimensions and Installation Geometry

Burkert 20033682 utilizes the Type 6027 standard threaded inline body with connection size G 1/4 and 42 mm coil frame (Size K):

Dimension Parameter	Symbol	Value (mm)
Process Connection Thread	A	G 1/4
Thread Depth	B	12.0 mm
Centerline to Rear Port Face	C	27.5 mm
Centerline to Bottom Mounting Face	E	10.0 mm
Overall Valve Height	F	105.0 mm
Centerline to Front Port Face	H	18.0 mm
Mounting Tapped Holes	J	M4
Mounting Hole Thread Depth	K	5.0 mm
Face-to-Face Body Length	L	55.0 mm
Coil Width (Size K / 42 mm)	M	42.0 mm
Coil Centerline Offset	N	27.0 mm
Coil Body Height	O	55.5 mm

Coil Characteristics and Electrical Connection

The valve utilizes a central bolted coil assembly (Size 42 mm / Type AC10/AC19) hermetically moulded in epoxy resin with Class H thermal insulation. The magnetic circuit is isolated from fluid media, enabling coil replacement without depressurizing the process piping.

Integrated Kick and Drop electronics feature an internal bridge rectifier and power switch. The coil draws 44 W for 500 ms during pull-in, followed by an immediate transition to 6.5 W holding power (5.5 W in thermal equilibrium). This double-coil control limits coil heating while supporting continuous duty (100% ED) across ambient temperatures up to +70 °C.

Cable Specification and Conductor Assignment

The electrical supply line is permanently encapsulated and exits perpendicular to the coil axis:

• Cable length: 3,000 mm (3.0 m)
• Cable jacket material: Polyolefin, halogen-free acc. to IEC 60754-1
• Outer cable diameter: 6.2 mm
• Minimum bending radius: 4 x outer diameter (fixed installation)
• Temperature rating: -55 °C to +145 °C (fixed installation)
• Conductor cross-section: 3 x 0.5 mm² stranded copper

Conductor Insulation Colour	Signal Assignment
Green-Yellow	Protective earth (PE)
Black (1)	Phase / L (+)
Black (2)	Neutral / N (-)

Explosion Protection Ratings

Burkert 20033682 is approved for use in hazardous areas under European ATEX directive and international IECEx certification:

• ATEX Gas: II 2G Ex mb IIC T4 Gb
• ATEX Dust: II 2D Ex mb IIIC T130 °C Db
• IECEx Gas: Ex mb IIC T4 Gb
• IECEx Dust: Ex mb IIIC T130 °C Db
• Temperature classification: T4 (gas atmospheres), T130 °C (dust atmospheres)
• Ingress protection rating: IP65

Installation and Maintenance Instructions

Pipeline Preparation

Prior to mounting, flush the pipeline thoroughly to prevent particulate debris from obstructing the 4.0 mm seat. Installing an upstream strainer with 0.2 mm to 0.4 mm mesh size is recommended to preserve seat integrity.

• Mounting Orientation: The valve can be installed in any physical position, but mounting with the solenoid coil upright is recommended to prevent sediment settling in the core guide tube.
• Flow Direction: Align flow strictly according to port markings: inlet port 1 (P) to outlet port 2 (A). Fluid entry occurs above the seat.
• Mechanical Installation: Hold the valve body across the wrench flats using an open-end wrench. Never use the solenoid coil or guide tube as a lever arm when tightening threaded piping.
• Coil Tightening Torque: The coil retaining nut must be tightened with a torque of 5 Nm (AF 14) or 15 Nm (AF 22) depending on the core interface. Avoid overtightening.
• Electrical Grounding: Always ensure the green-yellow protective conductor is connected to system ground. Verify electrical continuity between the protective conductor and the metallic valve body.

Hazardous Area Electrostatic Precautions

The encapsulated epoxy coil surface must be protected against electrostatic charges in explosive atmospheres. Clean the exterior surfaces using only a damp or anti-static cloth. Do not deploy the valve in processes involving strong electrostatic charge generation or pneumatic powder conveying.