Bürkert 21155 (Type 0290) is a servo-assisted 2/2-way diaphragm 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 the solenoid for reduced electrical power consumption.

Circuit Function

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

Materials

No.	Element	Material (Stainless Steel Variant)
1	Coil	Epoxy
2	Stopper	Stainless steel 1.4105, 1.4113 or 1.4523 (optional)
3	Shading ring	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	FKM
10	Diaphragm plate	Stainless steel 1.4401
11	Diaphragm	FKM
12	Body	Stainless steel 1.4581
13	Pilot valve seat	Stainless steel 1.4401
14	Seat seal	FKM

Dimensions

INFO

Dimensions in mm. The dimensions D1 and F1 apply to G thread.

DN	A	B	G (D1)	G (F1)	E	L	SW	J	H
12	80	94	G 1/2	14	40	74.5	27	81	40

Performance Specifications

Power consumption

Orifice	Kv value water P→A	Port connection	Inrush power (AC/DC)	Holding power (AC/DC)	Weight
12 mm	1.8 m³/h	G 1/2	80 W	25 VA / 10 W	1.0 kg

TIP

The coil with Kick and Drop electronics is a universal current coil (frequency coding: UC) that is suitable for AC and DC.

Installation and Safety

DANGER

Risk of injury from high pressure in the system Before loosening lines or valves, switch off the pressure and vent the lines.

Risk of injury from electric shock Before accessing the device or the system, switch off the power supply and secure it to prevent reactivation! Observe the applicable accident prevention and safety regulations for electrical devices.

Before Installation

Installation position: The installation position is flexible. Preferably: actuator at the top.

Dirt trap: For safe operation of the solenoid valve, a dirt trap (≤400µm) must be installed before the valve inlet.

WARNING

If there is no protective conductor function between the coil and body, there is a risk of injury from electric shock. Always connect the protective conductor. Check the protective conductor function after installing the coil.

1. Seal
2. Approved cable plug, e.g. Type 2508 or other suitable cable plug in accordance with DIN EN 175301-803 Form A

Screw cable plug tight, ensuring a maximum torque of 1 Nm. Check that the seal is properly fitted. Connect protective conductor and check electrical continuity between coil and body.