The Marotta Model Number MV602L is a magnetically latching, high-pressure valve that shuttles open and closed by alternating current polarity.  The construction involves conventional machining practices, stainless steel, all-welded construction, and a plastic seat.

To the right, Figure 1 shows the MV602 in the closed position, with red indicating the wetted area of the valve. In the closed position, sealing is achieved by the spring loading of the seat as shown.

When commanded, the plunger assembly moves to the open position, lifting the poppet off the seat and allowing fluid to pass through the valve as indicated in Figure 2. The permanent magnet located between the two solenoid coils ensures that the valve latches in the last commanded position, enabling the valve to remain open without power.

To close the valve, a reversed polarity signal will switch the flux path to overcome the force of the permanent magnet and move the plunger to the closed position shown in Figure 1.