Burkert 61481 (Type 0290) is a servo-assisted 2/2-way diaphragm solenoid valve. The valve opens without differential pressure. The opening process is facilitated by the fix-coupling of the diaphragm to the magnetic core. The integrated 'soft-kick' function ensures gentle opening. The solenoid coils are moulded with an epoxy that has a high level of chemical resistance. Kick and drop electronics are moulded into all DC solenoid variants for reduced electrical power consumption.

Circuit Functions

Symbol	Description
A (NC)	Circuit function A (CF A) 2/2-way solenoid valve Servo-controlled Normally closed

Technical Data

Product Properties	Details
Seal Material	FKM (NBR and EPDM available for other variants)
Body Material	Brass (Stainless steel 1.4581 available for other variants)
Coil Material	Epoxy
Valve Inner Parts	Brass, stainless steel
Orifice (Standard Variant)	DN 12...DN 50 (Model 61481 is DN 25)
Thermal Insulation Class	Epoxy coil class H
Duty Cycle	100% continuous operation (unless otherwise specified)
Switching Time (DN 12...DN 25)	Opening: 100...250 ms Closing: 700...2000 ms
Voltage Tolerance	±10%
Degree of Protection	IP65 with cable plug
Installation Position	As required, preferably with actuator upright

Medium Data

Seal Material	Permitted Media	Medium Temperature
NBR	Neutral gases and liquids (e.g. compressed air, water, hydraulic oil)	-10 °C...+80 °C
FKM	Per solutions, hot oils with additives	0 °C...+120 °C
EPDM	Oil-free and fat-free media (e.g. hot water)	-30 °C...+100 °C

Materials

No.	Element	Material
1	Coil	Epoxy
2	Stopper	Stainless steel 1.4105, 1.4113 or 1.4523 (optional)
3	Shading ring (AC variant only)	Brass variant: copper Stainless steel variant: silver
4	Spring	Stainless steel 1.4310
5	Magnetic core	Stainless steel 1.4105 or 1.4113
6	Core guide tube	Stainless steel 1.4303
7-9	O-ring	NBR, FKM, EPDM
10	Diaphragm plate	Brass variant: CuZn37 Stainless steel variant: 1.4401
11	Diaphragm	NBR, FKM, EPDM
12	Body	Brass or stainless steel 1.4581
13	Pilot valve seat	Brass variant: MS Stainless steel variant: 1.4401
14	Seat seal	NBR, FKM, EPDM

Dimensions

Threaded Variant

INFO

• Dimensions in mm
• The dimensions D1 and F1 apply to G thread.
• The dimensions D2 and F2 apply to NPT thread.

DN	A	B	G (D1)	G (F1)	NPT (D2)	NPT (F2)	E	L	SW	J	H
12	80	94	G 1/2	14	NPT 1/2	13.7	40	74.5	27	81	40
20	106	122	G 3/4	16	NPT 3/4	14	60	100	32	93	49
25	110.5	131	G 1	18	NPT 1	16.8	70	115	41	98	49
32	120	145	G 1 1/4	20	NPT 1 1/4	17.3	85	126	50	106	49
40	124	154	G 1 1/2	22	NPT 1 1/2	17.3	85	126	60	106	49
50	176	211	G 2	24	NPT 2	17.6	115	164	70	133	72
65	176	218.5	G 2 1/2	27	NPT 2 1/2	23.6	115	179	85	133	72

Flange Variant according to DIN EN 1092-1

DN	A	B	C	E	∅ G	L	M	K	J	H
25	110.5	170.5	68	70	120	160	14	85	98	49
32	120	190	78	85	140	180	18	100	106	49
40	126	201	88	85	150	200	18	110	106	49
50	176	258.5	102	115	165	230	18	125	133	72

Performance Specifications

Power Consumption (Standard Variant)

Orifice [mm]	Kv value water [m³/h]	Port connection	Inrush power AC [VA]	Inrush power AC/DC [W]	Holding power AC [VA/W]	Holding power AC/DC [W]	Weight [kg]
12	1.8	G 1/2	100	80	25/10	6	1.0
20	6.5	G 3/4	120	100	32/16	9	1.4
25	10.0	G 1	120	100	32/16	9	1.8
32	16.0	G 1 1/4	120	100	32/16	9	2.7
40	16.0	G 1 1/2	120	100	32/16	9	3.1
50	38.0	G 2	-	30	-	30	6.5

Installation and Safety

Dirt Trap Recommendation

For safe operation of the solenoid valve, a dirt trap (≤400µm) must be installed before the valve inlet. For devices with approval according to the European Gas Appliances Directive, installation of the filter is mandatory.

Danger - High Pressure

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

Electrical Safety

Before accessing the device or the system, switch off the power supply and secure it to prevent reactivation. Always connect the protective conductor and check the protective conductor function after installing the coil.