For Apollo® Top Entry Valves Incorporates a monitoring port between two packing sets enabling sensing of toxic leakage before it escapes to the atmosphere. The packing stack is pressure activated as well as live loaded. The internal spring is low rate compared to Belleville washer, thereby insuring positive packing load throughout a longer cycle life. The monitoring port can be pressurized with an inert fluid to a value in excess of internal valve pressure insuring zero leakage to the atmosphere.                                                         Top                                                         Main Page                                                         Place an Order                                                          E-Mail