Burkert Type 5282 (Model 20049679) is a servo-assisted 2/2-way diaphragm valve designed to control, shut off, and meter neutral media up to a viscosity of 21 mm²/s. A minimum differential pressure is required for the valve to function. Depending on the application, various diaphragm material combinations and circuit functions are available. The standard brass body satisfies all European drinking water requirements, and the body offering is completed with stainless steel variants.

The valve features a separating diaphragm for aggressive and contaminated media, individually adjustable closing and opening times, and a service-friendly manual override. 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 molded with a chemically resistant epoxy, ensuring durability in demanding industrial environments.

General Technical Data

Product properties	Description
Dimensions	See Dimensions section
Seal material	NBR, EPDM, FKM
Flange body	Stainless steel 1.4581/316CB
Threaded body	Brass according to DIN EN 50930-6 DN 13 stainless steel CF3M DN 20...DN 50 stainless steel 1.4581/316CB
Coil	Epoxy
Internal valve parts	Stainless steel, brass
Orifice	DN 13...DN 65
Circuit function	A and B
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
Operating voltage	24 V DC, 24 V 56 Hz, 230 V 56 Hz, 24 V AC/DC, 230 V AC/DC
Voltage tolerance	±10%
Degree of protection	IP65 with cable plug according to DIN EN 175301-803 form A IP65 with cable connection or terminal box
Installation position	As required, preferably with actuator upright
Ambient temperature	Max. + 55 °C

Circuit Functions

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

Approvals and Conformities

• Explosion protection (Optional): ATEX (II 2 G Ex mb IIC T4 Gb, II 2 D Ex mb IIIC T130 °C Db) / IECEx (Ex mb IIC T4 Gb, Ex mb IIIC T130 °C Db).
• North America (USA/Canada): UL Listed (UL 429, UL 429A), UL Recognized, CSA 139, FM Explosion Protection.
• Drinking water: Suitable for use in drinking water applications. Materials comply with the assessment principles (UBA) for materials in contact with drinking water (TrinkwasserV).
• DNV GL classification: Accepted for installation on all vessels classed by DNV GL (Ships, offshore units, and high speed and light craft).

Materials

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

Standard Threaded Variant

INFO

Dimensions in mm. The dimensions D1 and F1 apply to G thread. The dimensions D2 and F2 apply to NPT thread. The dimensions D3 and F3 apply to Rc thread.

Installation and Operation

DANGER

Risk of injury from high pressure and electrical shock.

• Before reaching into the device or the equipment, switch off the power supply and secure to prevent reactivation.
• Before loosening the pipes and valves, turn off the pressure and vent the pipes.
• 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.

Dirt filter: To ensure that the solenoid valve functions reliably, a dirt filter (≤ 500 µm) must be installed in front of the valve inlet.

Manual Emergency Actuation

WARNING

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

Changing Valve Function

DANGER

Discharge of medium due to leaking device. 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 (Normally Closed): 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 (Normally Open): 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.

Setting the Switching Times

The closing and opening times of the valve can be changed if required with the side throttle screws.

WARNING

Pressure surges caused by liquid media and short closing times. If closing times are fairly short, liquid media cause higher pressure surges. These may reduce the service life of the diaphragm and destroy other devices and components in the system. Discharge of medium can occur if the throttle screws are unscrewed too far.

Electrical Connection

Note the voltage and current type as specified on the type label. Tighten the cable plug observing a max. torque of 1 Nm. Check that the seal is fitted correctly. Connect the protective conductor and check electrical continuity between the coil and body.

Pulse Connection (CF 02)

• Pulse to Terminal 1 closes the valve; pulse to Terminal 2 opens the valve.
• Connect standard version L1/+ or N/– to Terminals 1 and 2 irrespective of the polarity.

TIP

Important information:

• Avoid emitting pulses simultaneously to both coil windings.
• Do not switch any other consumers (relays, etc.) at the same time as the terminals.
• The coil connection, to which voltage is not applied, must be galvanically isolated (open).
• If two or more valves are switched in parallel, ensure that this requirement is met by using 2-pole or multi-pole switches.