JIG FOR PRESSURE TEST

PURPOSE:To provide a pressure test jig being employed in the pressure or air tightness test of machines and piping in various plants in which handling and fitting are simplified while allowing hermetic sealing and pressurization of an arbitrary section without causing leakage or damage of packing even under high pressure thus allowing long term stabilized test. CONSTITUTION:In order to form a required test space, a piston member 15 applied with a packing 17, fitted sliding through an O-ring 16 to a cylindrical member 14 being fitted to a coupling shaft 12, is disposed oppositely to a fixed stopper plate 13 by means of a flange member 10 and a coupling shaft 12. Consequently, it can be handled easily as an integral jig and can be set at an arbitrary point of a machine or piping to be tested. Furthermore, high sealing performance can be exhibited by applying the packing 17 of the piston member 15 pressed by the inner pressure of the test space to a collar 19 provided on the outer peripheral end face of the stopper plate 13 and imparting the tightening force to the packing 17 thereby pressing the packing 17 against the inner wall.