1. A compensator with a variable volume for blood purification, containing a holder, a cavity and membranes, while the cavity (2) is installed on the holder (1), characterized in that: the first membrane (3) and the second membrane (4) are installed in the inner space the specified cavity (2) at a certain interval from each other, while the inner space of the cavity (2) is divided into three cavities, the first cavity (5), the second cavity (6) and the cavity (7) for silicone oil through the first membrane ( 3) and the second membrane (4), while the cavity (7) for silicone oil located between the first membrane (3) and the second membrane (4) and communicates with the piston pump (9), and the conductive through holes (2c) are made in the cavity wall of the specified first cavity (5) and are connected to the input connections of the first three-way solenoid valve (10) ), moreover, the conducting through holes (2d) are also made in the cavity wall of the specified second cavity (6) and are connected to the inlet connections of the first three-way solenoid valve (11). The indicated cavity (2) is formed by attaching the left left (2a) and the right half-body (2b), while the crimp ring (12) with a through hole at its upper end is located between the flanges of the first membrane (3) and the second membrane (4) to separate the first membrane (3) and the second membrane (4), said crimp ring (12) and flanges of the first membrane (3) and second membrane (4) being rigidly fixed by means of the left half-body (2a) and the right half-body (2b). rings (12) by means of a pressure plate (14), while the piston pump (9) is internal1. Компенсатор с изменяемым объемом для очистки крови, содержащий держатель, полость и мембраны, при этом полость (2) установлена на держателе (1), отличающийся тем, что:первая мембрана (3) и вторая мембрана (4) установлены во внутреннем пространстве указанной полости (2) на определенном интервале друг от друга, при этом внутреннее пространство полости (2
