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EV250B, Assisted lift operated 2/2-way solenoid valves

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FAQ

Which solenoid valve should I choose, if am not sure about the differential pressure of the application?
- Answer: If you are not completely sure about the differential pressure, you should choose the EV250B valve, because this valve works from 0 differential pressure. Alternatively, for low pressure and small dimensions, we recommend the direct-operated valve EV210B.
I am unsure about the pressure conditions in the installation, and I need a solenoid valve, size 1” - which should I choose?
- Answer: The best option for this size is our EV250B, capable of operating from 0 differential pressure.
I have mounted an EV220B valve in the warm water circuit of a heating system. The valve does not open. Is it defect?
- Answer: Under the circumstances that there is no dirt or limestone in the system, it is likely that the differential pressure is too low to operate the valve. In a closed system we recommend using a valve which doesn't require a differential pressure. If you use an assisted lift operated valve type EV250B, capable of operating from 0 bar differential pressure, your valve will work correctly.
Why does Danfoss not offer EV250B valves in bigger sizes than 1"?
- Answer: The bigger size of the valve, the more difficult it is to design an assisted lift valve that works optimally. Therefore it has been decided not to make these sizes to keep the high quality of our programme.
The solenoid valve EV250B is leaking. What should I do?
- Answer: First of all you need to determine whether the the leaking is internal or external. Internal leak: Normally comes from dirt or deposits on the orifice. In this case you should disassemble the valve, clean it to secure that there is no dirt particles blocking between the orifice and the diaphragm, avoiding the valve to close. External leak: You should check the following: 1) Seal material not appropriate for the medium 2) Temperature too low or too high 3) Pressure too high
What is the difference between the EV220B and EV250B valves?
- Answer: Valves type EV220B (servo-operated) are mainly used for open systems, where the differential pressure is higher than a certain value. An EV250B (assisted lift operated) can be used for both open and closed systems, but is mainly used in closed systems where the pressure conditions are low or uncertain. If you are not sure what the exact differential pressure will be, choose the EV250B.
I am looking for a gas valve for Argon application for a closed system, which valve could I use?
- Answer: Depending on the flow and differential pressure you can choose a direct operated valve EV210B or an assisted lift operated valve EV250B, both with FKM seal material.
Can I buy a pilot filter separately for flange solenoid valves EV220B 65-100 CI?
- Answer: Yes, you can. You need to order spare parts kit 016D0093.
Are EV250B valves suitable for vacuum?
- Answer: Yes, you may use the EV250B series for rough vacuum applications. Please ensure the valve is mounted in the right position (arrow way) from higher to lower pressure.
In a open water system, I have an EV210 valve which does not open - what can be wrong?
- Answer: Most likely the system pressure is too high. The EV210B operates from 0 to a limited differential pressure, especially on bigger valve sizes. If this is the case, we recommend a more powerful coil or a valve type EV220B or EV250B.
Are your valves certificied for use with water?
- Answer: All our EV210A, EV210B, EV220A, EV220B, EV250B are certified by WRAS. Some of the EV220B valve also have the French approval ATTESTATION DE CONFORMITE SANITAIRE, ACS and the Polish approval PANSTWOWY ZAKLAD HIGIENY, PZH. All these valves have seal material in EPDM.