Danfoss 018F6857 BG024DS 24 V DC Solenoid Coil Clip-On IP67

A 24 V DC clip-on coil for Danfoss EV solenoid valves

018F6857 is the Danfoss BG024DS solenoid coil: 24 V DC, 20 W, clip-on with a terminal box. It belongs to the BG range of high-performance coils in the Danfoss coil data sheet and is the DC option for valves such as the EV210B, EV220B, EV222B and EV224B. The Danfoss store lists it as a multi pack of 24 pieces with a coil enclosure rating of IP67, so check the quantity when ordering a single replacement.

Technical specifications

Choosing the right BG coil

The data sheet lists the BG range in several voltages: BG024AS (24 V, 50 Hz) 018F6807, BG110AS 018F6811, BG230AS 018F6801, BG240AS 018F6802, BG400AS 018F6803, BG024BS (24 V, 60 Hz) 018F6815, BG012DS (12 V DC) 018F6856 and this BG024DS (24 V DC) 018F6857. The DC coils draw 20 W and have a narrower ambient range of -40 to 50 C than the AC versions, which reach 80 C. Match the coil to the control voltage and to the valve family, and do not fit a 24 V coil to a 230 V circuit: a wrongly rated coil burns out quickly.

The Danfoss coil program covers both an easy-to-handle clip-on system and traditional coils with a threaded fastener. The BG coils are described as high performance coils with a terminal box connection. Other coil families in the same data sheet include BA, BD, BB, BE, BF, BH, BN, BJ, BX, BY and BQ types, and AM, AZ, AS and AP compact coils, each with their own code numbers, so never assume that coils with the same voltage are interchangeable across families.

Fitting and use

The BG coil has a clip-on fastening, so it is pushed onto the armature tube of the valve without tools; the terminal box takes the supply cable through a Pg 13.5 screwed entry. Keep the supply tolerance within plus or minus 10 percent and use a DC supply with adequate current for 20 W per coil, which is about 0.83 A at 24 V. A coil must never be energised off the valve because it will overheat.

Key features of the BG024DS coil

• 24 V DC operation, matching the control voltage of most PLC output cards, safety relays and building management controllers.
• Clip-on fastening that allows the coil to be changed without removing the valve from the pipework or draining the system.
• Terminal box with screwed cable entry, giving a robust connection for permanently wired installations.
• IP67 enclosure rating for wet and dusty locations.
• Class H insulation and continuous duty rating, so the coil can stay energised for long periods on normally closed valves held open.

Why a DC coil?

DC coils draw a steady current with no inrush, which makes them easy to supply from a standard 24 V DC power supply and to switch with transistor or relay outputs. They also avoid the hum that AC coils can produce. The trade-off is a higher continuous power than some AC coils and the narrower ambient range shown above. When several coils are energised together, add up the currents, at about 0.83 A per coil, when sizing the power supply and the output cards, and check voltage drop on long cable runs so the coil still sees at least the lower tolerance limit.

Replacement and installation procedure

1. Isolate the electrical supply and confirm that the coil is de-energised.
2. Disconnect the cable from the terminal box and remove the old coil by releasing the clip.
3. Inspect the armature tube for damage or corrosion; a damaged tube must be replaced as part of the valve, not the coil.
4. Push the new BG024DS onto the armature tube until the clip engages.
5. Connect the supply and earth through the Pg 13.5 entry and tighten the gland to keep the IP67 rating.
6. Energise and confirm that the valve opens and closes correctly.

Fit a suppression diode or the protective circuit recommended by the control equipment manufacturer across DC coils switched by relays or transistors, to limit the voltage spike when the coil is switched off.

Applications in Oman and GCC facilities

EV-series valves fitted with 24 V DC coils are used on water treatment skids, irrigation control panels, HVAC chilled-water and condensate lines, compressed air drains, and on process and utility lines in industrial plants. In the Gulf climate, outdoor valves can be exposed to direct sun and high surface temperatures. Because the DC coil’s ambient rating is lower than that of the AC versions, shade the valve or install it in a ventilated cabinet where summer temperatures would otherwise exceed the limit, or consider an AC coil if the control system allows.

Information for an RFQ

• Order number 018F6857 and the number of packs (24 pieces per pack as listed by Danfoss).
• Valve type and size the coil will be fitted to.
• Confirmation of the 24 V DC control voltage.
• Any matching valves, armature tubes or spare kits required at the same time.

Documents and quotation

The Danfoss solenoid coil data sheet is linked on this page. It pairs with the Danfoss EV220B range; see also the solenoid valves category. Seven Star LLC is an independent supplier in Muscat; confirm the pack size (24 pcs per Danfoss), voltage and valve family with the order number 018F6857 before ordering.