Apparatus for conducting a hydraulic proof test

Assembly for conducting a hydraulic proof test, which is a pressure resistance test, of a hydraulic installation which comprises a valve with parallel seats, a body of this valve having been stripped beforehand of its actuating stem, its parallel gates and a bonnet supporting said actuating stem, thus freeing an opening for accessing said parallel seats, wherein said assembly comprises:

• a shut off member with parallel plates, one of said parallel plates being apertured and an other of said parallel plates being solid, said parallel plates being connected by connecting means making it possible to regulate their mutual separation, so as to be able to make them go from a first position, which is a retracted position in which this mutual separation is sufficient to enable the introduction of said shut off member into said valve via said opening, to a second position, which is an expanded position, in which said mutual separation is greater than that of said parallel plates in said first position, said mutual separation making it possible to apply said parallel plates firmly against said parallel seats-;
• a device for inserting and supporting said shut off member inside said valve, wherein said device comprises an inner tool which has a general “U” shape and is configured to be introduced into said valve, parallel arms of said inner tool forming guides for introduction and removal of said shut-off member, while a base of the inner tool forms a support for retaining said shut-off member, allowing a view of the application of its parallel plates against said parallel seats;
• a dummy stem, which is a sealing equipment configured to close said valve in a leak tight manner after putting said bonnet back in place on said body.