Assembly of several pistons for pressure control of a confined space.

摘要

It comprises a body (12) having an intake connection (14) intended to be connected to said confined space (2), an extraction connection (16) intended to be connected to an extraction circuit (8, 18), and a reference-pressure intake port (34). Inside the body (12), a cylinder block (22) delimits with the body (12) an intake manifold (40), an extraction manifold (42) and a reference-pressure manifold (44) respectively. A plurality of cylinders (P) is provided in the cylinder block (22). Each cylinder (P) communicates via a lateral port (46) with the extraction manifold (42). The pistons (P) are capable of exposing at least partially the lateral ports (46) communicating with the extraction manifold. <IMAGE>