Burkert 323684 Type 6213 is a servo-assisted 2/2-way diaphragm valve designed for controlling, shutting off, and dosing neutral media with a viscosity of up to 21 mm²/s. The spring coupling of the diaphragm supports the opening process in the valve. In its standard variant, the valve requires a minimum differential pressure for full opening. The 323684 model features a brass body, NBR seal, G1 internal thread, and operates on 24V. To reduce electrical power consumption during operation, coils with integrated Kick-and-Drop (KD) electronics featuring double coil technology are available.

General Technical Data

Property	Specification
Seal Material	NBR, FKM, EPDM
Body Material	Brass acc. to DIN EN 50930-6, Stainless steel 1.4408
Coil Material	Polyamide, epoxy (insulation class H)
Orifice	Standard: DN 10...DN 40
Duty Cycle	100% continuous operation; KD coil max. 6 switching cycles/minute
Voltage Tolerance	±10%
Degree of Protection	IP65 with cable plug Type 2518

Circuit Function

Circuit function A (CF A): 2/2-way solenoid valve, servo-controlled, normally closed.

Materials

No.	Element	Material
1	Nut	Steel (thick-film passivated), Stainless steel 1.4305, PTFE-coated
2	Coil	Polyamide or epoxy
3	Stopper	Stainless steel 1.4113
4	Shading ring	Copper (Cu) with brass body; Silver (Ag) with stainless steel body
5	Magnetic core	Stainless steel 1.4113
6	O-ring	FKM
7	Plunger seal	NBR, FKM, EPDM
8	Bonnet	PA6
9	Cover	DN 10...DN 25: stainless steel 1.4301; DN 40: brass, stainless steel 1.4408
10	Spring	Stainless steel 1.4310
11	Diaphragm	NBR, FKM, EPDM
12	Diaphragm support	PPSGF40 in combination with brass or stainless steel parts
13	Valve body	Brass, stainless steel 1.4408

Dimensions

Standard Variant

DN	A	B	C	D	E	G	L	SW	Coil size
10	71.1	82.1	36	46	22	G 1/4, G 3/8	50	22	5 and 6
13	82.6	95.9	44.5	56.7	27.25	G 1/2	58	27	5 and 6
20	99.6	120.1	65	76.6	37.5	G 1	80	41	5 and 6
25	143.4	163.4	77	88	46	G 1	95	41	K and L
40	165.4	200.4	104.5	117	64	G 2	132	70	K and L

Coil Dimensions

Coil size	H	J	K	O	M
5	32	20.5	45	41	3.4
6	40	23.5	51	41	3.4
K	42	27	55.5	64	7
L	65	37.5	72	64	7

Installation

Risk of injury from high pressure

Before loosening lines or valves, switch off the pressure and vent the lines.

Risk of injury from electric shock

Before reaching into the device or the system, switch off the power supply and secure it against reactivation. Observe the applicable accident prevention and safety regulations for electrical devices.

Installation Position

The installation position is optional, but preferably with the actuator upright.

1. Clean pipelines of any contamination.
2. Install a dirt trap upstream of the valve inlet (≤ 500 µm).
3. Hold the device on the body using an open-end wrench and screw into the pipeline. Do not use the solenoid as a lever arm.
4. Observe the flow direction: the arrow on the body indicates the flow direction.

Maintenance and Troubleshooting

Risk of injury due to improper maintenance

Maintenance may be carried out by authorised technicians only and with the appropriate tools. Secure the system against unintentional activation.

Solenoid Installation:

1. Slide solenoid housing onto core guide tube.
2. Screw solenoid with nut. Always tighten nut with an open-end wrench. Using other tools may damage the device.
3. Check protective conductor.

Troubleshooting:

• Valve does not actuate: Check for short circuit or solenoid interruption. Ensure core or core area is not contaminated. Verify operating pressure is within the permitted range.
• Valve does not close: Check if the interior of the valve is contaminated or if the small control bore in the diaphragm is blocked.