Fig. 2.60. Backpressure valve of the VAD system: 1 – backpressure valve; 2 – green; 3 – white; 4 – inlet collector; 5 – vacuum chamber of the VAD system

The backpressure valve (unidirectional) keeps vacuum in the vacuum chamber of the VAD system. The backpressure valve allows air to pass only from the vacuum chamber of the VAD system to an inlet collector (fig. 2.60).