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SD74

TABLE 2-1 Double-Acting Cylinder Operators

VALVE DESIGN

Valve Action Down to Close Up to Close Down to Close Up to Close

Maximum

Controller Output,

Valve

Closes Opens Opens Closes

For Controller Air

Failure, Valve

Opens Closes Closes Opens

Positioner Mounting Inverted Inverted Normal Normal

TABLE 2-2 Single-Acting Operators

VALVE DESIGN

Actuator Top Top Bottom Bottom

Valve Action Air Closes Air Opens Air Opens Air Closes

Desired Valve Action

Maximum

Controller Output,

Valve

Closes Opens Opens Closes Opens Closes Closes Opens

For Controller Air

Failure, Valve

Opens Closes Closes Opens Closes Opens Opens Closes

For Positioner

Supply Air Failure,

Valve

Opens Opens Closes Closes Closes Closes Opens Opens

Mounting Position Inverted Normal Inverted Normal Normal Inverted Normal Inverted

Port to be

Connected to

Actuator

Valve 2 Valve 1 Valve 2 Valve 1 Valve 2 Valve 1 Valve 2 Valve 1

Port to be Plugged Valve 1 Valve 2 Valve 1 Valve 2 Valve 1 Valve 2 Valve 1 Valve 2

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 24 25

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Siemens CA 333 Series Spezifikationen Seite 11