The PIVSU-EX-O is designed to supervise the position of a Post Indicator or Butterfly valve in hazardous outdoor locations. The device mounts in a 1/2" NPT threaded nipple to the valve body. When properly mounted, the indicator of the Post Indicator valve or the operating mechanism of the Butterfly Valve will be pushing against the return spring of the PIVSU-EX-O so that as the valve is operated, the spring in the PIVSU-EX-O pulls the trip rod over and activates the switch. To aid with installation the trip rod length is adjustable. This device features a UL listed explosion proof switch enclosure.
Testing
The operation of the PIVSU-EX-O and its associated protective monitoring system shall be tested upon completion of the installation and inspected, tested and maintained in accordance with all applicable local and national codes and standards and/or the Authority Having Jurisdiction, (manufacturer recommends quarterly or more frequently). A minimum test shall consist of turning the valve operating mechanism towards the closed position. The PIVSU-EX-O shall operate within the first two revolutions of the operating mechanism. Fully close the valve and ensure the PIVSU-EX-O does not restore. Fully open the valve and ensure that the PIVSU-EX-O restores to normal.
Theory Of Operation
The PIVSU-EX-O is a spring loaded switch. It is in normal position when the trip rod is pulling against the spring force. Normal is when the switch is installed on the valve and the valve is fully open. As the valve closes, the valve actuator moves away from the trip rod of the PIVSU-EX-O and the spring on the PIVSU-EX-O pulls the trip rod over and trips the switch.
