DATA SHEET Servo-assisted 2/2-way diaphragm valve • Servo-assisted diaphragm with diameter of up to DN 50 • Vibration-proof, central screwed coil system • Damped design for quiet closing • Energy-saving double coil technology with kick and drop variant • Explosion-proof versions Product variants described in the data sheet may differ from the product presentation and description. Type 2518 Cable plug, form A according to  DIN EN 175301 - 803 Type 2509 Cable plug, form A according to  DIN EN 175301 - 803 The 6281 valve is a servo-assisted solenoid valve of the S.EV series. A minimum differential pressure is always required for the function of the valve. Various diaphragm material combinations and methods of operation are available depending on the application. The standard brass housing satisfies all European drinking water requirements. Dezincification-resistant brass is available for other markets. The housing offering is rounded out by a stainless steel version. To reduce power consumption in operation, coils with "Kick and Drop" (KD) electronics assembly (double coil technology) are available. The valve can be equipped with manual override for easy maintenance and commissioning. NEMA 4X is available on request. Standard | EU | en | 2023 - 12 - 11 | 18 © Christian Bürkert GmbH & Co. KG, Subject to alteration

General technical data Circuit functions Visit product website

General technical data Product properties Dimensions Further information can be found in chapter “5. Dimensions” on page 7. Material Seal Body Inner valve parts Orifice Circuit function Thermal insulation class of solenoid coil Performance data Duty cycle Switching time 1.) Electrical data Operating voltage Power consumption Voltage tolerance Medium data NBR, EPDM, FKM Brass acc. to DIN EN 50930 - 6, stainless steel (dezincification resistant on request) Stainless steel, Brass, Plastic (PPS) DN 10…DN 50 Further information can be found in chapter “2. Circuit functions” on page 4. Polyamide coil...

Circuit functions 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 3.1. General notes • The approvals and conformities listed below must be stated when making enquiries. This is the only way to ensure that the product complies with all required specifications. • Not all available versions can be supplied with the below mentioned approvals or conformities. 3.2. Conformity In accordance with the Declaration of Conformity, the product is compliant with the EU Directives. 3.3....

3.5. North America (USA/Canada) Approval SOLENOID FOR USE IN HAZARDOUS LOCATIONS E504714 Description Valid for valves: UL Listed for the USA The valves are UL Listed for the USA according to: • UL 429 (electrically operated valves) and UL 429A (Electrically Operated Valves for Fire Protection Service) Valid for coils: UL Hazardous Locations – Explosion Protection UL Listed for Hazardous Locations for USA and Canada Class I, Zone 1 Class I, Division 2, Group A, B, C and D Class II + III, Division 2, Group F and G Valid for valves: UL Recognized for the USA The valves are UL Recognized for the...

4.1. Bürkert resistApp Bürkert resistApp – Chemical resistance chart You want to ensure the reliability and durability of the materials in your individual application case? Verify your combination of media and materials on our website or in our resistApp. Start chemical resistance check Element Coil Stopper Shading ring Magnetic core O-rings Core seal Spring O-rings Diaphragm Diaphragm holder Valve body Material Polyamide 1.) or Epoxy 2.) Stainless steel 1.4113 Cu (brass version) Ag (stainless steel version) Stainless steel 1.4113 NBR, FKM, EPDM NBR, FKM, EPDM Stainless steel 1.4310 NBR, FKM,...

5.1. Standard version Note: • Dimensions in mm • The dimensions F1 and G1 apply to G-thread. • The dimensions F2 and G2 apply to NPT-thread. • The dimensions F3 and G3 apply to Rc-thread. Coil size Visit product website

1.) Only threaded brass connection 2.) Only threaded stainless steel connection Visit product website

5.2. ATEX/IECEx cable version Note: • Dimensions in mm • The dimensions F1 and G1 apply to G-thread. • The dimensions F2 and G2 apply to NPT-thread. • The dimensions F3 and G3 apply to Rc-thread. • For DN 50 see dimensions “5.3. ATEX/IECEx terminal box version” on page 10 Cable coil Cable length according to order specification K Visit product website

1.) Only threaded brass connection 2.) Only threaded stainless steel connection 5.3. ATEX/IECEx terminal box version Note: • Dimensions in mm • Standard at DN 50 Coil size 5 6 Rotated view of the junction

5.4. Compressor relief valves Note: • Dimensions in mm • The dimensions F1 and G1 apply to G-thread. • The dimensions F2 and G2 apply to NPT-thread. • The dimensions F3 and G3 apply to Rc-thread. H G1/8 Visit product website

Performance specifications 6.1. Power consumption Circuit function ATEX AC/DC Nominal power [W] – – 9 7 9 – – – 6.2. Power consumption Kick and Drop coil Circuit function A A B B Product accessories 7.1. Cable glands for ATEX/IECEx terminal box Note: A polyamide cable gland is included in the scope of delivery. A nickel-plated brass version can be ordered for a surcharge, see “Cable glands for ATEX/IECEx terminal box” on page 21. Description Ex cable gland, Nickel-plated brass, 6…13 mm Ex approvals Certification PTB 04 ATEX 1112 X, IECEx PTB 13.0027X Ex cable gland, Polyamide, 7…13 mm Visit product...

7.2. Special tool to turn the terminal box Note: This special tool is not included in the scope of delivery of the valve, see “Cable glands for ATEX/IECEx terminal box” on page 21. Description Set SC02-AC10 Components of the set • Special wrench • Service manual Ordering information 8.1. Bürkert eShop Bürkert eShop – Easy ordering and quick delivery You want to find your desired Bürkert product or spare part quickly and order directly? Our online shop is available for you 24/7. Sign up and enjoy all the benefits. Order online now 8.2. Bürkert product filter Bürkert product filter – Get quickly...