BURKERT 333699 (Type 6213 EV) is a servo-assisted 2/2-way diaphragm valve with spring coupling that allows the main valve orifice to open without requiring an operating differential pressure. Built with a cast stainless steel 1.4408 body, an internal NPT 1 process thread, and EPDM seat and external seals, the valve delivers an open water flow factor (Kv) of 11 m³/h and a gas flow factor (QNn) of 11,900 l/min across an operating pressure range of 0.00 bar to 10.00 bar.

Operating on 230 V to 240 V AC (50/60 Hz), article 333699 integrates Bürkert Kick and Drop double-coil technology (coil size K, 42 mm width). The electronics provide a high inrush power pulse of 85 W for approximately 500 ms to lift the plunger, subsequently stepping down to a cold holding power of 8.5 W and a warm holding power of 7 W, reducing thermal dissipation and electrical power consumption during steady-state operation.

Circuit Function

Article 333699 operates in circuit function A (CF A). It is a servo-controlled, 2/2-way valve that remains closed when de-energized (normally closed, P/NC inlet port 1).

Circuit Function Symbol	Description
CF A	2/2-way solenoid valve, servo-controlled, normally closed

Technical Specifications

Parameter	Value
Model / Article Number	Type 6213 EV / 333699
Circuit Function	A (Normally Closed, 2/2-way)
Nominal Diameter (DN)	DN 25 (25.00 mm / 1 inch)
Port Connection	Female thread NPT 1 (F2 = 16.8 mm)
Installation Length	95 mm
Operating Pressure Range	0.00 bar - 10.00 bar (PN 10)
Water Flow Capacity (Kv)	11 m³/h (measured at +20 °C, 1 bar inlet pressure, free outlet)
Gas Flow Capacity (QNn)	11,900 l/min
Pilot Control Orifice	1.4 mm
Body Material	Stainless steel 1.4408
Seal Material	EPDM (seat seal and external seals)
Medium Temperature Range	-30 °C to +100 °C (with epoxy coil)
Ambient Temperature Range	-40 °C to +55 °C
Maximum Media Viscosity	21 mm²/s
Operating Voltage / Frequency	230 V - 240 V AC, 50/60 Hz (Voltage tolerance ±10%)
Actuator / Coil Technology	Kick and Drop double-coil energy saving technology (CZ05)
Coil Size / Width	Size K / 42 mm
Power Consumption	Inrush (approx. 500 ms): 85 W; Holding cold: 8.5 W; Holding warm: 7 W
Duty Cycle	100% ED continuous operation (max. 6 switching cycles/min for KD coil)
Electrical Port Connection	Plug pattern Form A according to DIN EN 175301-803 (plug enclosed)
Degree of Protection	IP65 (with properly mounted Type 2518 cable plug), NEMA 4X
Approvals	UL Listed (UL 429), cURus Recognized

Material Specifications

Item No.	Component	Material
1	Nut	Steel (thick-film passivated acc. to RoHS) / Stainless steel 1.4305, PTFE-coated
2	Coil	Epoxy (insulation class H) / Polyamide
3	Stopper	Stainless steel 1.4113
4	Shading ring (AC version)	Silver (Ag) with stainless steel body (Copper Cu with brass body)
5	Magnetic core	Stainless steel 1.4113
6	O-ring	FKM
7	Plunger seal	EPDM (NBR, FKM optional)
8	Bonnet	PA6
9	Cover	Stainless steel 1.4301 (DN 10 to DN 25)
10	Spring	Stainless steel 1.4310
11	Diaphragm	EPDM (NBR, FKM optional)
12	Diaphragm support	PPS GF40 in combination with stainless steel parts
13	Valve body	Stainless steel 1.4408

Dimensions

Valve Body Dimensions (Standard Variant)

All dimensions are stated in millimeters (mm). For NPT threads, thread depth F2 and thread marking G 2 apply.

DN	A	B	C	D	E	F1 (G)	G 1	F2 (NPT)	G 2	F3 (Rc)	G 3	L	SW	Coil Size
10	71.1	82.1	36	46	22	12	G 1/4	10.0	NPT 1/4	—	—	50	22	5 and 6
10	71.1	82.1	36	46	22	12	G 3/8	10.3	NPT 3/8	10.1	Rc 3/8	50	22	5 and 6
10	73.1	86.6	36	46	24.5	14	G 1/2	13.7	NPT 1/2	13.2	Rc 1/2	55	27	5 and 6
13	82.6	95.9	44.5	56.7	32.5	14	G 1/2	13.7	NPT 1/2	13.2	Rc 1/2	65	27	5 and 6
13	84.6	100.6	44.5	56.7	32.5	16	G 3/4	14.0	NPT 3/4	14.5	Rc 3/4	65	32	5 and 6
20	97.1	113.1	65	76.6	37	16	G 3/4	14.0	NPT 3/4	14.5	Rc 3/4	80	32	5 and 6
20	99.6	120.1	65	76.6	37.5	18	G 1	16.8	NPT 1	16.8	Rc 1	80	41	5 and 6
13	109.3	122.8	44.5	56	32.5	14	G 1/2	13.7	NPT 1/2	13.2	Rc 1/2	65	27	K and L
13	111.3	127.3	44.5	56	32.5	16	G 3/4	14.0	NPT 3/4	14.5	Rc 3/4	65	32	K and L
20	123.9	139.9	65	76.6	37	16	G 3/4	14.0	NPT 3/4	14.5	Rc 3/4	80	32	K and L
20	126.4	146.9	65	76.6	37.5	18	G 1	16.8	NPT 1	16.8	Rc 1	80	41	K and L
25	143.4	163.4	77	88	46	18	G 1	16.8	NPT 1	16.8	Rc 1	95	41	K and L
25	148.3	173.3	77	88	46	20	G 1 1/4	17.3	NPT 1 1/4	19.1	Rc 1 1/4	95	50	K and L
40	159.4	189.4	104.5	117	61	22	G 1 1/2	17.3	NPT 1 1/2	19.1	Rc 1 1/2	126	60	K and L
40	165.4	200.4	104.5	117	64	24	G 2	17.6	NPT 2	23.4	Rc 2	132	70	K and L

Solenoid Coil Dimensions

Coil Size	H (mm)	J (mm)	K (mm)	O (mm)	M (mm)
5	32	20.5	45	41	3.4
6	40	23.5	51	41	3.4
K	42	27.0	55.5	64	7.0
L	65	37.5	72	64	7.0

Electrical Power Consumption & Kick and Drop Coil

Article 333699 utilizes a double-coil actuator with integrated electronics (CZ05) for high opening force followed by low holding energy dissipation.

Orifice DN (mm)	Coil Size (mm)	Coil Code	Cold Inrush Power (approx. 500 ms)	Cold Holding Power	Warm Holding Power
10 - 13	40	6	20 W	2.0 W	—
13 - 20	42	K	44 W	6.5 W	5.5 W
13 - 20 (ATEX)	42	K	44 W	6.5 W	5.5 W
13 - 40 (DN 25)	42	K	85 W	8.5 W	7.0 W

Switching Frequency and Duty Cycle

Unless specified otherwise, the solenoid actuator is rated for 100% ED continuous operation. When using Kick and Drop coils, the maximum permissible operating frequency is 6 switching cycles per minute.

Installation and Piping Guidelines

Before connecting the valve into the system, clear all piping of chips, rust, and particulate contamination.

Upstream Filtration Recommendation

Install a dirt trap or strainer with a mesh rating of ≤ 500 µm upstream of the valve inlet to prevent particulate matter from lodging in the pilot channels or clogging the diaphragm control hole.

• Mounting position is arbitrary, preferably with the solenoid actuator upright.
• Observe flow direction: the cast arrow on the valve body indicates fluid flow from inlet port 1 to outlet port 2.
• Hold the valve body directly across the hex flats (SW 41 mm) using an open-end wrench. Never use the solenoid coil as a lever arm when tightening threaded pipe joints.
• Connect the cable plug (Form A acc. to DIN EN 175301-803) and tighten the central fastening screw to a maximum torque of 1 Nm.
• Always connect the protective earth (PE) conductor and verify electrical continuity between the coil connector earth terminal and the stainless steel body.

Solenoid Coil Installation and Maintenance

Item	Description
1	Fastening nut
2	Core guide tube
3	O-ring
4	Anti-twist device
5	Tightening torque for fixing nut

When servicing or replacing the solenoid coil, position the coil housing over the core guide tube and anti-twist device, then tighten the retaining nut using an open-end wrench.

Solenoid Type	Solenoid Width	Fastening Nut Tightening Torque
AC10	32 mm or 40 mm	5 Nm
AC19 (Size K)	42 mm	10 Nm

Operating Safety Warnings

• Energizing the solenoid coil without a completely mounted valve body will cause severe overheating and permanent coil failure.
• Do not loosen or overtighten the retaining nut while the system is under pressure. Depressurize and vent all process lines before beginning maintenance.