BURKERT 20008302 (Type 6281 EV) is a servo-assisted 2/2-way diaphragm solenoid valve configured in circuit function A (normally closed, inlet port 1 / P). Designed with a nominal orifice of DN 13 mm (pilot orifice 1.2 mm) and female G 1/2 process ports, the unit handles neutral liquids and gases within a pressure range of 0.2 to 16 bar. Media-contacting components combine a brass body conforming to DIN EN 50930-6 with ethylene-propylene-diene rubber (EPDM) seals. Powered by a 24 V DC solenoid rated for 100% continuous duty, the valve achieves a water flow factor (Kv) of 3.8 m³/h and a gas flow rate (QNn) of 4,100 l/min.

The servo-assisted diaphragm architecture requires a minimum differential pressure of 0.2 bar for opening, while opening the complete cross-section requires a pressure differential of 0.5 bar. When de-energized, the core spring presses the pilot seal against the pilot orifice, causing pressure to build above the diaphragm through a small equalization channel and keeping the valve tightly closed over the seat. Energizing the 24 V DC coil lifts the plunger to unseat the pilot channel, venting the chamber above the diaphragm to the outlet and allowing upstream medium pressure to lift the diaphragm for damped, low-noise opening.

Technical Specifications

Parameter	Specification
Product Type	Type 6281 (Generation EV)
Article Number (SKU)	20008302
Circuit Function	A (2/2-way, normally closed)
Nominal Diameter (DN)	13 mm (pilot orifice 1.2 mm)
Port Connection	Internal thread G 1/2 (DIN ISO 228)
Operating Voltage	24 V DC (voltage tolerance ±10%)
Solenoid Power Consumption	Cold power: 9.5 W, warm power: 8 W
Operating Pressure Range	0.2 to 16 bar (nominal pressure PN 16)
Minimum Differential Pressure	0.2 bar (0.5 bar for full opening)
Flow Capacity Kv (Water)	3.8 m³/h (measured at +20 °C, 1 bar delta P)
Flow Capacity QNn (Gas)	4,100 l/min
Body Material	Brass acc. to DIN EN 50930-6
Sealing Material	EPDM (seat seal and external O-rings)
Medium Temperature	-30 °C to +100 °C
Ambient Temperature	-30 °C to +55 °C
Storage Temperature	-40 °C to +80 °C
Permissible Fluid Viscosity	Up to 21 mm²/s
Switching Times	Opening: 0.1 to 1.5 s, closing: 0.2 to 4 s
Duty Cycle	100% continuous operation (ED)
Degree of Protection	IP65 (with cable plug assembled)
Electrical Connection	Plug pattern Form A acc. to DIN EN 175301-803
Flow Direction	Over seat (marked by directional arrow on body)
Installation Length	65 mm
Approvals & Conformities	UL Listed, cURus Recognized (UL 429), CE, EAC

Medium Compatibility with EPDM Seals

Valves fitted with EPDM seals are suitable for cold and hot water, and oil-free and fat-free liquids. Per source documentation, EPDM must not be used with media containing mineral oils, petrol, or hydrocarbons.

Materials and Internal Construction

Item	Component	Material
1	Solenoid coil	Polyamide (PA, thermal insulation class B)
2	Stopper	Stainless steel 1.4113
3	Shading ring	Copper (brass body version)
4	Magnetic core (plunger)	Stainless steel 1.4113
5	O-ring	EPDM
6	Core seal	EPDM
7	Core spring	Stainless steel 1.4310
8	O-ring	EPDM
9	Diaphragm	EPDM
10	Diaphragm holder	Poly Phenylene Sulfide (PPS GF40)
11	Valve body	Brass acc. to DIN EN 50930-6

Dimensions and Installation Envelope

Dimensions below correspond to standard threaded valve variants in millimeters (mm):

Dimension Parameter	DN 10 (G 1/4, G 3/8)	DN 10 (G 1/2)	DN 13 (G 1/2 — Article 20008302)	DN 13 (G 3/4)	DN 20 (G 3/4)	DN 25 (G 1)
Height A	83.1	85.1	91.1	93.1	99.6	106.6
Height B	94.1	98.6	104.6	109.1	115.6	127.1
Width C	32	32	42	42	60	70
Width D	44	44	54.5	54.5	74	85
Centerline E	22	24.5	32.5	32.5	37	46
Thread Depth F1	12	14	14	16	16	18
Port Thread G1	G 1/4, G 3/8	G 1/2	G 1/2	G 3/4	G 3/4	G 1
Face-to-Face L	50	50	65	65	80	95
Wrench Flat SW	22	27	27	32	32	41

Solenoid Coil Dimensions (Coil Size 32 mm / Width AC10)

• Width H: 32 mm
• Center Offset J: 20.5 mm
• Length K: 45 mm
• Height M: 41 mm
• Clearance O: 3.4 mm

Installation and Electrical Connection

Mechanical Piping and Depressurization Notice

• Switch off fluid pressure and vent all connecting pipework before loosening lines or fittings.
• Clean pipes thoroughly and install a dirt trap or strainer upstream of the valve inlet with a mesh rating of ≤ 500 µm.
• Do not use the solenoid coil as a lever arm when tightening process connections into the pipe.
• Hold the valve body directly using an open-end wrench across wrench flats (SW 27 mm for DN 13).
• Verify medium flow matches the direction of the arrow cast on the valve body.

Electrical Wiring

1. Ensure the power supply is switched off and secured against unintentional re-activation.
2. Connect the cable plug (Form A acc. to DIN EN 175301-803, such as Bürkert Type 2518 or 2509) using the flat gasket.
3. Tighten the central cable plug retaining screw to a maximum torque of 1 Nm.
4. Connect the protective ground conductor and verify electrical continuity between the solenoid housing and the brass valve body.

Solenoid Coil Replacement and Assembly

1. Slide the solenoid coil housing over the core guide tube.
2. Ensure the solenoid seats firmly on the housing lid and engages the anti-twist mechanism.
3. Fasten the central fixing nut using an open-end wrench.
4. Tighten the nut to the specified torque of 5 Nm for solenoid width 32 mm (AC10). Do not overtighten.

Fire Hazard from Unmounted Coils

Never energize the solenoid coil unless it is fully installed on the valve armature tube. Operating a detached solenoid causes rapid overheating and coil destruction.

Maintenance and Troubleshooting

Continuous Operation Guidance

To maintain functional reliability during extended plant downtime, perform at least 1 to 2 switching actuations per day.

Symptom	Probable Cause	Corrective Action
Valve fails to actuate	Electrical supply interrupted or short circuit	Check terminal voltage, polarity, and coil resistance.
	Operating pressure out of specification	Verify supply pressure meets the 0.2 to 16 bar range and minimum differential pressure is ≥ 0.2 bar.
	Plunger core or core guide chamber contaminated	Disassemble coil and core tube; clean internal core guide and plunger spring assembly.
Valve fails to close	Diaphragm equalization control bore blocked	Remove body screws, inspect diaphragm, and clear the pilot control bore.
	Internal seat or diaphragm contaminated or damaged	Inspect EPDM diaphragm and valve seat for foreign particulates or wear; replace with genuine spare parts.

Spare Part Kits

Spare parts for Type 6281 are ordered as structured service sets by quoting the set designation and the device article number (20008302):

• SET 1: Plunger, core spring, and core seal assembly.
• SET 3: Complete diaphragm assembly with PPS holder and O-rings.
• SET 7: Sealing kit containing internal and external EPDM O-rings.