Danfoss EV210B - How to Choose

12
IC.PS.600.A4.02 / 520B2809
IC.PS.600.A4.02 / 520B2809
How to Choose
It is important to indentify all relevant parameters when selecting a solenoid
valve.
This includes:
• Capacity / k
v
- value
• Pressure conditions
• Media conditions
• Other conditions
Pressure conditions:
Open system (system with drain)
In an open system the pressure conditions are well-dened.
This enables clarication as to whether there is sucient pressure dierential to
be able to open a servo-operated valve. The following types of valves are
well-suited for use in open systems:
EV210B, EV210A, EV310B and EV310A direct -operated solenoid valves
EV220B, EV220A and EV225B servo-operated solenoid valves
Capacity / k
v
- value:
– Species how many m
3
/hour (capacity) water is passing through the valve at a
dierential pressure at 1 bar.
– Is a result of all the dierent constants coming from shape of orices, units etc.
which are reduced to one new constant, the k
v
- value.
– Is used to calculate capacity:
– ρ = density (kg / m
3
)
– P = P
1
- P
2
Q = k √
∆P
m3 / h
V
ρ
Closed circuit (cirulating system)
In a closed circuit system the pressure conditions are undened. Therefor a
solenoid valve capable of opening without pressure dierential is required.
EV250B assisted lift servo-operated valve
EV210B, EV210A, EV310B and EV310A direct-operated solenoid valves