samson薩姆森4740型限位開(kāi)關(guān)
Design and principle of oper-
ation
The Type 47 40 Limit Switch can be mountedonto the following devices:
- Type 3353 Angle Seat Valve (see Fig. 1)Type 3354 Globe Valve
- Type 3379 Pneumatic Actuator
The inductive proximity switches or micros-witches cause signals to be sent to a control .or alarm system when the travel exceeds orfalls below the adjusted limit.
The limit switch can optionally be fitted witha 3/2-way solenoid valve. When the inte-grated solenoid valve is energized, supplyair is applied to the actuator. When the so-lenoid valve is de-energized, the actuator isvented and the control valve moves to its fail-safe position.
The switching points of the limit contacts canbe changed within the travel range after in-stallation. See section 5.1 on page 20.
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