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Hand lever un-activated (valve closed):
When the hand lever (1) is un-activated no force is applied to the eccentric (2) and the valve spindle (4). Hereby the valve is kept closed by the spring (5), which presses the valve plate (7) with the seat gasket (8) against the valve orifice (9). The valve will be closed for as long as the hand lever is kept in the closed position, which is indicated at the top of the valve.
Hand lever activated (valve open):
When the hand lever (1) is activated clock-wise as indicated on the functional sketch, the eccentric (2) is rotated and presses against the underlay (3). Hereby a force is applied to the valve spindle (4). The force from the spindle is via the bellow (6) applied to the valve plate (7), which together with the seat gasket (8) is raised from the valve orifice (9). Hereby the valve is opened with or against the pressure of the medium. The valve will be open for as long as the hand lever is positioned in the open position, which is indicated at the top of the valve.
As an additional feature the manual valve can be positioned partly open in fixed steps (please also see technical data).
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