AIR/VACUUM VALVE THROTTLING APPARATUS

摘要

An air/vacuum valve throttling device capable of use with an air/vacuum valve in a piping installation is provided. The throttling device has a body with an interior and a number of ports. A vent/admit port connectable to the air/vacuum valve is provided. An outlet port and an air inlet port are also located in the body. A shaft extends from outside the body into the int erior and has a plug connected to an end of the shaft so that the plug is located within the interior of the body. The shaft and plug are constructed and arranged to extend into the outlet port. The plug p osition is adjustable. A rod is also provided having a plug at one end extending into the i nterior and a retainer at another end outside the interior. A bushing in the air inlet port having an o pening to allow the rod to pass therethrough, and a spring is used for resiliently centering the rod in the air inlet port.