If water pressure exceeds 0.3Mpa, ins¶ tall a pressure reducing v₩φδalve must be installed in front of th '​e water purification m‍₹achines, or else the w÷σδater pressure is too >∑high, it may lead to a ¶$δn ultrafiltration membrane rupture a∏≠≈δnd leak, resulting i✔ n substandard water quality.