An automatic bidirectional valve (1,1') for high pressure pumps comprising: - a valve body - a central conduit of the through type that crosses the valve body and is provided with a first opening made in a first end of the valve body and a second opening made in an opposite second end of the valve body, - a peripheral conduit (75,75') made in the valve body, eccentric with respect to the central conduit and provided with a first opening (80,80'), made in a portion of the valve body comprised between the first end and the second end, and a second opening made in the second end of the valve body, - a first shutter movable at least between a closing position, in which it hermetically obstructs the first opening of the central conduit, and an opening position, in which it is distanced from the first opening of the central conduit and allows the passage of flow through the first opening itself, - a first elastic element configured to generate a force adapted to maintain the first shutter in the closing position, - a second shutter movable at least between a closing position, in which it hermetically obstructs the second opening of the peripheral conduit, and an opening position, in which it is distanced from the second opening of the peripheral conduit and allows the passage of flow through the second opening itself, - a second elastic element configured to generate a force adapted to maintain the second shutter in the closing position, and - a retaining body (140,145) removabily fixed to the valve body and configured to hold in position one from among the first elastic element and the second elastic element so that said elastic element exercises said force on the respective shutter (95,110) said automatic bidirectional valve being characterized by the fact that the retaining body (140,145) is fixed to the valve body by means of a snap coupling mechanism (150,175). - a valve body - a central conduit of the through type that crosses the valve body and is provided with a first opening made in a first end of the valve body and a second opening made in an opposite second end of the valve body, - a peripheral conduit (75,75') made in the valve body, eccentric with respect to the central conduit and provided with a first opening (80,80'), made in a portion of the valve body comprised between the first end and the second end, and a second opening made in the second end of the valve body, - a first shutter movable at least between a closing position, in which it hermetically obstructs the first opening of the central conduit, and an opening position, in which it is distanced from the first opening of the central conduit and allows the passage of flow through the first opening itself, - a first elastic element configured to generate a force adapted to maintain the first shutter in the closing position, - a second shutter movable at least between a closing position, in which it hermetically obstructs the second opening of the peripheral conduit, and an opening position, in which it is distanced from the second opening of the peripheral conduit and allows the passage of flow through the second opening itself, - a second elastic element configured to generate a force adapted to maintain the second shutter in the closing position, and - a retaining body (140,145) removabily fixed to the valve body and configured to hold in position one from among the first elastic element and the second elastic element so that said elastic element exercises said force on the respective shutter (95,110)