2/2 way assisted lift, servo operated valve
- From zero differential pressure
- For neutral and slightly aggressive liquids and gases such as water, oil and compressed air
- 0-16 bar pressure range
- Coil enclosure up to IP67
- Valve sizes from 10-22 mm DZR dezinfication resistant brass
- WRAS approval on EPDM versions
- Suitable for Rough Vacuum duty
Click for the Danfoss EV250B data sheet.
Click to buy the Danfoss EV250B on-line now or call Ray – CSE’s Danfoss Consultant on 023 8025 5757.
|Pressure Range||Vacuum to 16 bar|
|Ambient temperature:||Max 80°C|
|Media temperature:||FKM : 0 to +100°C / EPDM: -30 to +120°c (140°C up to max 3.6 bar)|
|Materials:||Valve body : DZR Brass|
|O rings : EPDM or FKM|
|Valve plate : EPDM or FKM|
|Diaphragm : EPDM or FKM|
|Code No.(without coil)||End Connection||Kv Value (m3/h)||Orifice (mm)||Seal* Material||Type designation||Differential pressure (bar based on coil BB max.|
|Main type||Specification||min.||10 W a.c.||18 W d.c.|
EV250B Normally Open Range
|EV250B 10B||G 3/8||EPDM||0-10 bar||032U5350|
|EV250B 12B||G 1/2||EPDM||0-10 bar||032U5352|
|EV250B 18B||G 3/4||EPDM||0-10 bar||032U5354|
|EV250B 22B||G 1||EPDM||0-10 bar||032U5356|
*EPDM seals for use on water, glycol and steam
NC – Normally closed versions, NO – normally open versions (in specification code)
Coil also required for complete product, see coil types BB, BE and BG.
The EV250B is an assisted lift, servo operated valve which is ideal in closed circuit systems with circulation pumps, e.g. central heating systems. In these systems it is difficult to know how much differential pressure is available because the pump and system load are constantly varying. This means that sometimes the differential pressure is too great for direct operated valves and sometimes too low for servo operated valves. We therefore offer a range of high flow valves designed for pressures from 0 to 16 bar.
The EV250B is often a good choice of valve in drainage applications since the pressure in a tank when it is completely filled can be too great for a direct operated valve. Similarly, the pressure is often too low for a servo operated valve when the tank has almost drained.
Please note: The small orifices, passages and dead spaces in solenoid valves of any manufacture are vulnerable to dirt particles in the fluid. Best practice is to fit a strainer/filter in front of any valve: this is not always possible but all valves subject to the possibility of dirt in the system must be protected this way where dirt is highly likely to be present, for example outlets from metal storage tanks for diesel fuel hydroscopic oils, externally operated valves such as the type AV210 should be used.