The great point in favour of this construction is that the medium only comes in contact with the inside of the hose and 这种泵的结构上的另一个显著的特点是介质仅与软管隔膜的内侧和阀门相接触，而不是象典型的隔膜活塞泵那样，介质同泵腔和泵盖也都分别会有接触。