t's mostly suitable for the seal pressure of the flange straight connection valve and performance test
of the valve body strength pressure; The packing method adopts the flange terminal seal, holds the
press claw clamp and carries out the working test to the valve flange reverse side.The test result has
no the influence of outside force, fully meet the GB/T 13927-2008, JB/T 9092-99, the API 598 requirements.