Movement control valve

A movement control valve of the parts-in-body type, comprising:

• a housing (10), concentric to a longitudinal axis (X), which comprises a loading opening (11), an unloading opening (12), a pilot opening (13) and an installation opening (14);
• a sealing seat (15), sealingly slidable along the housing (10), which delimits a passage (15a) that places the loading opening (11) in communication with the unloading opening (12);
• a shutter (16), sealingly slidable along the housing (10) between a closed position, in which it is in contact with the sealing seat (15) and blocks the passage (15a), and an open position, in which it is moved away from the sealing seat (15) and frees the passage (15a);
• a first elastic means (15b), disposed in such a way as to push the sealing seat (15) towards the shutter (16);
• and
• an abutment element (17), removably fixed in the housing (10) and configured so as to define an abutment in contact with which the sealing seat (15) is disposed as a result of the push exerted by the first elastic means (15b) and the pressure present at the loading opening (11),
• wherein the housing (10) comprises at least a first section (10a), intended to sealingly contain the sealing seat (15), a second section (10b), intended to sealingly contain the abutment element (17), and a third section (10c), intended to sealingly contain at least a first portion (16a) of the shutter (16), wherein the diameter of the first section (10a) is smaller than the diameter of the second section (10b) and the diameter of the second section (10b) is smaller than the diameter of the third section (10c).