Electromagnetically operated valve,
type VV2138 (DN16) and VV2438 (DN25-50)

• Low power consumption < 300/8 W
• Change of coil without disassembly of valve
• Built in 9-30 V pilot function, accepting both NPN & PNP signals - can also be delivered as direct controlled
• Robust to voltage drops
• Built in memory secures that the valve returns to same position after power failure
• Patented assisted lift servosystem for valves size DN 25 - 50
• Optional: Position indicator by reed sensor

Coil voltage disconnected (closed):
When the voltage to the coil (1) is disconnected, the complete armature assembly with the valve plate (3) incl. seat gasket (4) is pressed down against the valve orifice (5) by the closing spring (6) and the media pressure. The valve will be closed for as long as the voltage to the coil is disconnected.

The magnet (7) built in with the armature assembly makes it possible to indicate the closed position of the valve with an optional position sensor.

Coil voltage connected (open):
When the voltage is applied to the coil (1), the complete armature assembly with the valve plate (5) incl. seat gasket (4) is lifted clear of the valve orifice (5). The valve is now open for unimpeded flow and will be open as long as the voltage to the coil is connected.

The magnet (7) built in with the armature assembly makes it possible to indicate the open position of the valve with an optional position sensor.

Coil voltage disconnected (closed):
When the voltage to the coil (1) is disconnected, the armature (2) with the pilot gasket (4) is pressed down against the pilot orifice (6) by the closing spring (3). The pressure across the servo piston (5) is built up via the equalizing orifice (8). The servo piston with seat gasket (9) closes the main orifice (10) as soon the pressure across the servo piston is equivalent to the inlet pressure below, due to the large diameter at the upper side of the piston and the tension of the closing spring (3). The valve will be closed for as long as the voltage to the coil is disconnected.

The magnet (11) built in at the servo piston makes it possible to indicate the closed position of the valve with an optional position sensor.

Coil voltage connected (open):
When the voltage is applied to the coil (1), the armature (2) with the pilot gasket (4) is lifted clear of the pilot orifice (6). If there is a differential pressure across the valve, the pressure above the servo piston (5) drops as the pilot orifice is larger than the equalizing orifice (8). Therefore the servo piston and the seat gasket (9) is lifted clear of the main valve orifice (10). If there is none or only a small differential pressure across the valve, the armature (2) draws the complete servo piston (5) with seat gasket clear of the main valve orifice (10) using the assisted lift spring (7). The valve will be open as long as the voltage to the coil is connected.

The magnet (11) built in at the servo piston makes it possible to indicate the open position of the valve with an optional position sensor.