A drain valve having a temperature responsive member that holds the drain valve in a water conserving mode when water is above freezing yet allows the drain valve to drain when the water is near freezing to prevent freeze damage to the irrigation system.
申请公布号
US7377286(B2)
申请公布日期
2008.05.27
申请号
US20060343288
申请日期
2006.01.30
申请人
KING JR LLOYD HERBERT;BELGERI MICHAEL;KEEVEN JAMES
发明人
KING, JR. LLOYD HERBERT;BELGERI MICHAEL;KEEVEN JAMES