Burkert 355232 Type 5282 is a servo-assisted 2/2-way diaphragm solenoid valve designed to control, shut off, and meter neutral media. A minimum differential pressure is required for the valve to function. The 355232 variant features a stainless steel body, G 1 internal thread, NBR seal, and operates at 230V. It is equipped with a service-friendly manual override for start-up and testing, and carries ATEX/IECEx explosion protection approvals.

The 3/2-way pilot valve can be easily converted from NC (normally closed) to NO (normally open) circuit function by rotating it on the armature. The solenoid coils are moulded with a chemically resistant epoxy, ensuring durability in demanding industrial environments.

General Technical Data

Product properties	Details
Orifice	DN 13...DN 65 (Model 355232 is DN 25)
Circuit function	A and B (Model 355232 is A - normally closed)
Thermal insulation class	Epoxy coil class H
Duty cycle	100% continuous operation
Switching time	Opening: 0.1...0.8 s, Closing: 1.0...4.0 s
Voltage tolerance	±10%
Installation position	As required, preferably with actuator upright
Ambient temperature	Max. + 55 °C

Note on Switching Time

Measurement at +20 °C, 6 bar at the valve outlet, opening: pressure build-up 0…90 %, closing: pressure reduction 100…10 %. The switching time can be changed by turning the throttle screws (in the housing lid).

Circuit Functions

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

Approvals and Conformities

Explosion Protection (ATEX/IECEx) Optional explosion protection according to category 2 (zone 1/21). Ex marking of the components for coils with terminal box:

• ATEX: EPS 16 ATEX 1 111 X, II 2G Ex eb mb IIC T4 Gb, II 2D Ex mb tb IIIC T130 °C Db
• IECEx: IECEx EPS 16.0049X, Ex eb mb IIC T4 Gb, Ex mb tb IIIC T130 °C Db

Material Specifications

No.	Element	Material
1	Coil	Epoxy
2	O-ring	NBR, EPDM, FKM
3	Cover	Brass (DN 13 stainless steel 1.4408/316, DN 20...DN 50 stainless steel 1.4581/316CB)
4	Spring	Stainless steel 1.4310/302
5	Diaphragm	NBR, EPDM, FKM
6	Diaphragm holder	Brass, stainless steel 1.4401 /316
7	Valve body	Brass (DN 13 stainless steel CF3M, DN 20...DN 50 stainless steel 1.4581/316CB)
8	Manual override	PA

Dimensions

Threaded Variant

DN	A1	B1	G (D1)	G (F1)	E1	L1	SW
13	109.0	123.0	G 1/2	14	40	65	27
20	115.0	131.0	G 3/4	16	60	100	32
25	121.5	142.0	G 1	18	70	115	41
32	122.0	147.0	G 1 1/4	20	85	126	50
40	126.0	156.0	G 1 1/2	22	85	126	60
50	142.5	177.5	G 2	24	115	164	70

(Note: Dimensions in mm. Table shows G thread dimensions. Refer to full datasheet for NPT and Rc dimensions.)

Installation and Operation

Risk of injury from high pressure

Before loosening the pipes and valves, turn off the pressure and vent the pipes.

Risk of injury due to electrical shock

Before reaching into the device or the equipment, switch off the power supply and secure to prevent reactivation. Observe applicable accident prevention and safety regulations for electrical equipment.

Before Installation: Installation can be in any position, preferably with the actuator upright. Prior to installation, check pipelines for dirt and clean if required. To ensure that the solenoid valve functions reliably, a dirt filter (≤ 500 µm) must be installed in front of the valve inlet.

Installation: Hold the device with a suitable tool (open-end wrench) on the body and screw into the pipeline. Observe the direction of flow: The arrow on the body indicates the direction of flow (no function in opposite flow direction).

Caution risk of breakage

Do not use the coil as a lever arm.

Manual Emergency Actuation:

When the manual emergency actuation is locked, the valve can no longer be actuated electrically.

Changing Valve Function:

If the O-rings are forgotten or incorrectly inserted during installation of the pilot valve, the device will be damaged and medium will be discharged. Before screwing in the pilot valve, correctly insert O-rings into the depressions.

• Function NC: The pilot valve is installed in such a way that the manual emergency actuation points in the direction opposite to the direction of flow arrow.
• Function NO: The pilot valve is installed in such a way that the manual emergency actuation points in the same direction as the identification for the flow direction.