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6281EV Servo-Assisted 2/2-Way Diaphragm Valve

Brand: Burkert Fluid Control Systems

The 6281 valve is a servo-assisted solenoid valve of the S.EV series. A minimum differential pressure is always required for the proper 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.

The solenoid coils are moulded with a chemically resistant epoxy. For reduced energy requirement, all coils can be delivered with electronic power reduction.

The valve can be equipped with manual override for easy maintenance and commissioning.

In combination with a plug in accordance with DIN EN 17301-803 Form A, the valves satisfy protection class IP65 - in combination with a stainless steel housing NEMA 4X.
Features
  • Servo-assisted diaphragm with diameter of up to DN 50
  • Vibration-proof, central screwed coil system
  • Damped design for quiet closing
  • Moulded housing with high surface quality
  • Service-friendly manual override

1 - 12 of 301 Part Numbers
221 841
221 841
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/8” / 13 mm
  • Voltage / Frequency - 24 Vdc
221 842
221 842
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/8” / 13 mm
  • Voltage / Frequency - 24 V, 50/60 Hz
221 843
221 843
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/8” / 13 mm
  • Voltage / Frequency - 230 V / 50/60 Hz
221 844
221 844
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G1/2” / 13 mm
  • Voltage / Frequency - 24 Vdc
221 845
221 845
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G1/2” / 13 mm
  • Voltage / Frequency - 24 V, 50/60 Hz
221 846
221 846
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G1/2” / 13 mm
  • Voltage / Frequency - 230 V / 50/60 Hz
221 847
221 847
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 13 mm
  • Voltage / Frequency - 24 Vdc
221 848
221 848
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 13 mm
  • Voltage / Frequency - 24 V, 50/60 Hz
221 849
221 849
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 13 mm
  • Voltage / Frequency - 230 V / 50/60 Hz
221 850
221 850
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 20 mm
  • Voltage / Frequency - 24 Vdc
221 851
221 851
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 20 mm
  • Voltage / Frequency - 24 V, 50/60 Hz
221 852
221 852
  • Version - Circuit Function A (NC, Normally Closed), Brass Body
  • Seal Material / Coil / Process Temperature - NBR / Polyamide / -10° to 80° C (14° to 176° F)
  • Port Connection / Orifice - G 3/4” / 20 mm
  • Voltage / Frequency - 230 V / 50/60 Hz
1 - 12 of 301 Part Numbers

Specifications

Ambient Temperature Range

  • Maximum

Approvals & Certifications

  • European Gas Approval EPDM with KTW W270
  • IECEx PTB 14.0049 x Ex Mb IIC T4 Gb Ex Mb IIIC T130° C (266° F) Db (Explosion-proofed), IECEx EPS 16.0021 x Ex Eb Mb IIC T4 Gb Ex Mb Tb IIIC T130° C (266° F) Db (Coil & Junction Box)
  • PTB 14-ATEX-2023 x II 2 G Ex Mb IIC T4 Gb II 2D Ex Mb IIIC T130° C (266° F) Db (Explosion-proofed), EPS 16-ATEX-1046 x II 2 G Ex Eb Mb IIC T4 Gb II 2D Ex Mb Tb IIIC T130° C (266° F) Db (Coil & Junction Box)
  • VDE Mark Approval According to DIN EN 60730

BSP Connection

  • G 1” Female
  • G 1/2” Female
  • G 1-1/2” Female
  • G 1-1/4” Female
  • G 2” Female
  • G 2-1/2” Female
  • G 3/4” Female
  • G 3/8” Female
  • 1” BSPT Female
  • 1/2” BSPT Female
  • 1-1/2” BSPT Female
  • 1-1/4” BSPT Female
  • 2” BSPT Female
  • 3/4” BSPT Female

Consumption

  • Power Consumption (DC Hot/Cold Coil): 9 W - Ex Coil (with Internal Rectifier) Circuit Function A & B
  • Power Consumption (Hold with Coil AC): 14 / 8 VA / W - Circuit Function A
  • Power Consumption (Hold with Coil AC): 16 / 7 VA / W - Circuit Function B
  • Power Consumption (Hold with Coil DC): 8/9.5 W (Hot/Cold Coil) - Circuit Function A & B
  • Power Consumption (Inrush AC): 24 VA - Circuit Function A & B
  • Power Consumption (Inrush, Hold with Coil AC): 9 VA / W - Ex Coil (with Internal Rectifier) Circuit Function A & B

Diaphragm Material

  • Diaphragm Holder (PPSGF40, DN 50): Brass
  • Diaphragm Holder (PPSGF40, DN 50): Stainless Steel
  • EPDM
  • FKM
  • NBR

Duty Cycle

  • 100 % Continuous Rating

Electrical Connectors

  • Tag Connector According to DIN EN 175301-803 Form A for Cable Plug Typical 2508

Electrical Contacts

  • Normally Closed
  • Normally Open

Enclosure, Body Material

  • 316 Stainless Steel - ASTM A351 CF8M, 1.4408
  • Brass According to DIN EN 50930-6

Environmental Protection

  • IP65 with Junction Box, Cable Plug & Cable Connection
  • IP66
  • NEMA 4X
  • Vibration-Proof

Flow Rate

  • Water: 3.8 to 40 Kv (m³/hour)

Insulation

  • Epoxy: Coil Isolation Class H
  • Polyamide: Coil Isolation Class B

Internal Part Material

  • Valve: Brass
  • Valve: Plastic (PPS)
  • Valve: Stainless Steel

Materials of Construction

  • Coil: Epoxy with FKM Seal
  • Coil: Polyamide with NBR, EPDM Seal
  • Stopper, Magnetic Core: 434 Stainless Steel

Mounting Position

  • Preferably with Actuator Upright

NPT Connection

  • 1” NPT Female
  • 1/2” NPT Female
  • 1-1/2” NPT Female
  • 1-1/4” NPT Female
  • 2” NPT Female
  • 2-1/2” NPT Female
  • 3/4” NPT Female

O-Ring Material

  • EPDM
  • FKM
  • NBR

Orifice Size

  • 0.511” to 1.968” (13 to 50 mm)

Override

  • Manual Override

Pressure Range

  • psi: 2.901 to 232.1 (kPa: 20 to 1,600, bar: 0.2 to 16)

Process Temperature

  • EPDM: -30° to 90° C (-22° to 194° F) [with Epoxy Coil to 100° C (212° F)]
  • FKM: 0° to 90° C (32° to 194° F) [(with Epoxy Coil to 120° C (248° F)]
  • NBR: -10° to 80° C (14° to 176° F)

Response Time

  • 0.1 to 4 seconds (Depending on Orifice & Differential Pressure)

Ring Material

  • Short Circuit Ring: Copper (Cu) with Brass Body
  • Short Circuit Ring: Silver (Ag) with Stainless Steel Body

Seat / Seal Material

  • Armature Seal: EPDM (Media: Oil & Fat-Free Fluids, Hot Water, Aceton, Aqueous Alkali Solution)
  • Armature Seal: FKM (Media: Hot Air, Per-Solution)
  • Armature Seal: NBR (Media: Neutral Fluids, Compressed Air, Water)

Solenoid Type

  • 2/2-Way

Spring Material

  • 301 Stainless Steel, 1.4310

Tolerance

  • Voltage Tolerance: ± 10 %

Voltage

  • 230 V / 50/60 Hz / UC
  • 24 V / 50/60 Hz / UC
  • 24 Vdc
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