Danfoss EV220BW Servo Solenoid Valve for Drinking Water

EV220BW servo-operated drinking water solenoid valve, DN 15 to 50

The Danfoss EV220BW is an indirect servo-operated 2/2-way solenoid valve range made for drinking-water and general neutral-liquid service, from DN 15 to DN 50 with G1/2 to G2 connections. It is offered with an Eco brass body (lead free, below 0.1 %) for neutral and slightly aggressive liquids and non-flammable gases, or with a stainless steel body for neutral and aggressive liquids and non-flammable gases, in both cases with EPDM seals, a built-in filter, a water-hammer-damped design and a clip-on coil with enclosure up to IP67. Seven Star LLC supplies the EV220BW in Oman and the GCC as an independent supplier in Muscat.

EV220BW technical specifications

How the EV220BW works

In the NC version the armature presses the valve plate onto the pilot orifice when the coil is off, and the pressure built up above the diaphragm through the equalising orifice holds the main orifice shut. With voltage on, the armature lifts, the pilot orifice opens, pressure above the diaphragm falls and the inlet pressure lifts the diaphragm. The valve needs at least 0.3 bar differential pressure to hold open. The NO version is open when de-energised and closes when voltage is applied. Because the opening depends on line pressure the valve is a good fit for mains-pressure water supply rather than gravity feeds, for which the assisted-lift EV250BW is more suitable.

Eco brass or stainless steel body

Choose Eco brass for treated drinking water, heating and cooling water, and neutral liquids, where its dezincification resistance and lead-free composition help. Choose the stainless steel body when the liquid is aggressive or the water quality is poor, such as brine or fluids with higher chloride content, subject always to the compatibility of EPDM with the medium. Both versions share the same dimensions class and the same Kv values.

EV220BW compared with related Danfoss valves

Coil options and power consumption

The valve body is ordered without a coil. The clip-on coils named in the datasheet include BB024AS (24 V, 50 Hz, 11 W, 19 VA, code 018F7358), BB230AS (220–230 V, 50 Hz, 11 W, 19 VA, code 018F7351), the DC coils BB012DS (12 V DC, 13 W, code 018F7396) and BB024DS (24 V DC, 16 W, code 018F7397), and the BE240CS coil (018F6783) with a −25 to 55 °C ambient range. The AC coils are rated for −40 to 80 °C ambient and the DC coils for −40 to 50 °C, so a hot enclosure favours AC coils.

Switching times by size

The datasheet lists indicative times for water, from 40 ms to open and 350 ms to close at the smallest size, rising to 5000 ms to open and 10000 ms to close at DN 50. Slow closing at the larger sizes is part of the water-hammer damping, so it must be allowed for when a sequence depends on closing time.

Selection and ordering checklist

• Body material: Eco brass or stainless steel.
• Size and connection from Kv value and available differential pressure.
• Function NC or NO and the fail-safe position.
• Coil type and voltage (BB, BE clip-on coils; AC or DC).
• Medium and temperature up to 90 °C; ambient temperature near the coil.
• Minimum pressure difference of at least 0.3 bar in all operating cases.

Installation, commissioning and maintenance

The valve has a built-in filter, but it should still be inspected periodically and cleaned according to the datasheet when flow drops. Exercise the valve at least every 24 hours in water service to limit sticking, mount at the permitted angle with the flow arrow respected, and keep water within the recommended hardness (6 to 18 °dH) and conductivity (50 to 800 µS/cm) values to limit scaling and dezincification. Do not leave warm water stagnant in the valve above 25 °C.

Typical applications in Oman and the GCC

Typical uses include main inlet valves and zoning in houses, apartments and commercial buildings, washing and laundry machines, kitchens, food processing, and heating or cooling water circuits including chilled-water brine. In the Gulf the 80 °C ambient rating with AC coils helps in hot plant rooms, and stainless bodies suit coastal or brackish water locations.

Information to send with an RFQ

• Size, body material and NC or NO function.
• Coil voltage and frequency.
• Medium, temperature and pressure.
• Quantity and delivery location in Oman or the GCC.

Documents and quotation

A Danfoss datasheet for the EV220BW drinking-water solenoid valves is attached on this page.

Send the size, body material and coil voltage and we will confirm the matching valve.