A natural gas relief device for high pressure ball valve

The utility model relates to a natural gas relief device for high pressure ball valve, including crossover sub, second and third stop valve, foraminiferous blind plate, the inlet end of crossover subfeeds through with high pressure ball valve's valve drain, and its end of giving vent to anger is equipped with two branch roads, and the one of which passes through the one end intercommunication ofsecond stop valve and foraminiferous blind plate, and the other end of foraminiferous blind plate is equipped with the unloading circuit, and next feeds through with the one end of third stop valve, and the other end of third stop valve is equipped with the unloading detection line, and foraminiferous blind plate and unloading circuit all lie in the top of third stop valve and unloading detectionline. The utility model discloses a with valve drain and unloading circuit intercommunication, the natural gas in the high pressure ball valve valve pocket causes outdoor safe region fast to avoid natural gas leakage to pipelin