Description

Danfoss Servo-Operated Solenoid Valves EV220B 15-50

Danfoss Solenoid Valve

Features:-

• For water, steam, oil, compressed air, and gases.

• Ambient temperature: Up to 80 °C.

• Coil enclosure: Up to IP67.

• Water hammer damped.

• Built-in filter for protection of the pilot system.

• Adjustable closing time available.

• EV220B 15-50 NC and NO brass version for neutral liquids and gasses.

• EV220B 15-50 NC DZR brass version for neutral and slightly aggressive liquids and gases.

• EV220B 15-50 NC Stainless Steel version for neutral and aggressive liquids and gases.

Functions:-

Coil voltage disconnected (closed)-

When the voltage is disconnected, the valve plate (3) is pressed down against the pilot orifice (4) by the armature spring (2). The pressure across the diaphragm (5) is built up via the equalizing orifice (7). The diaphragm closes the main orifice (6) as soon as the pressure across the diaphragm is equivalent to the inlet pressure. The valve will be closed for as long as the voltage to the coil is disconnected.

Coil voltage connected (open)-

When voltage is applied to the coil (1), the pilot orifice (4) is opened. As the pilot orifice is larger than the equalizing orifice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orifice (6). The valve is now open for unimpeded flow and will be open for as long as the minimum differential pressure across the valve is maintained, and for as long as there is voltage to the coil.

Danfoss Servo-Operated Solenoid Valves EV220B 15-50

Function NO, brass-

Coil voltage disconnected (open)

When the voltage to the coil (2) is disconnected, the pilot orifice (4) is open. As the pilot orifice is larger than the equalizing orifice (7), the pressure across the diaphragm (5) drops and therefore it is lifted clear of the main orifice (6). The valve will be open for as long as the minimum differential pressure across the valve is maintained, and for as long as the voltage to the coil is disconnected.

Coil voltage connected (closed)-

When voltage is applied to the coil, the valve plate (3) is pressed down against the pilot orifice (4). The pressure across the diaphragm (5) is built up via the equalizing orifice (7). The diaphragm closes the main orifice (6) as soon as the pressure across the diaphragm is equivalent to the inlet pressure. The valve will be closed for as long as there is voltage to the coil.