Backflow tiv thaiv, Tws Valve
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Backflow tiv thaiv, Tws Valve
Nyeem ntxivBackflow tiv thaiv tsuas yog siv rau cov khoom siv dej los ntawm chav dej hauv plawv av kom tsis txhob muaj dej ntws tsuas yog ib txoj kev. Nws txoj haujlwm yog los tiv thaiv lub backflow ntawm lub raj hluav taws xob lossis cov mob siphon ntws rov qab, txhawm rau kom tsis txhob muaj kuab paug rov qab.
