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Control connection un-pressurized (valve closed):
When the air pressure to the control connection (3) is disconnected, the cylinder (1) is un-pressurized and 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 control pressure is disconnected.
The magnet (10) built in at the control piston makes it possible to indicate the closed position of the valve with an optional position sensor.
Control connection pressurized (valve open):
When the air pressure to the control connection (3) is connected, the cylinder (1) is pressurized and thus the pressure at the control piston (2) moves 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 opens with or against the pressure of the medium. The valve will be open for as long as the control pressure is connected.
The magnet (10) built in at the control piston makes it possible to indicate the open position of the valve with an optional position sensor.
As an additional feature the open and closed valve position is visually indicated by the moving valve spindle at the top of the valve.
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