Pneumatic Switches
Pneumatic switches are designed to monitor pneumatic-driven machines and equipment. They are used to control, regulate and oversee the system. The confusion arises in that directional and circuit control valves are also called switches. They may be adjustable and operate a relay or other control device, directly or indirectly. By sensing pressure, they can initiate a control action or sound an alarm. There are various types of pneumatic switches. The control switches are either two-, three- or four-way in configuration and feature threaded , barbed and/or push-to-connect ports. The pressure switch is designed to monitor the process pressure and closes the circuit when a set pressure has been reached on its input (either a rise or a fall) or responds to a difference in pressure. It applies process pressure to a piston and diaphragm to generate a force which is transmitted to a pre-compressed spring. Other types include manual, safety, cylinder and actuator switches. Pneumatic switches are incorporated into any pneumatic-conveying equipment and machinery. They can be found in food manufacturing process plants, where it is preferred as a power source since there is less chance of contamination. They can also be seen in tools used for mining or construction.
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