A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
BACKFLOW PREVENTION APPARATUS
A backflow prevention apparatus 1 is provided with a check valve 10 and a float-type backflow prevention valve 20, these being installed in this order as one proceeds from upstream to downstream. The check valve 10 comprises a valve seat 15 that causes a location toward the float-type backflow prevention valve 20 and a location upstream therefrom in a wastewater drainage system to be placed in mutual communication; a valve member 14 that closes the valve at the valve seat 15 due to an upwardly directed restoring force and that opens the valve at the valve seat 15 as a result of being made to fall when the restoring force is overcome by a hydraulic head of wastewater flowing thereinto from a location upstream therefrom; and a restoring force exerting means 13 that exerts an upwardly directed restoring force on the valve member 14; wherein the components responsible for causing closure of the valve at the valve seat 15 by the valve member 14-which include the valve seat 15, the valve member 14, and the restoring force exerting means 13-are formed from metal(s). The float-type backflow prevention valve 20 comprises an annular valve seat 21 that causes a location downstream therefrom in the wastewater drainage system and a location toward the check valve 10 to be placed in mutual communication; a float 24 that rises in accompaniment to a rise in a water level of wastewater to close the valve at the annular valve seat 21 and that falls in accompaniment to a fall in a water level of wastewater to open the valve at the annular valve seat 21; a guide member 22 that guides movement of the float 24 in a vertical direction; and a constraining member 23 that constrains a lowermost position to which the float 24 can move.
BACKFLOW PREVENTION APPARATUS
A backflow prevention apparatus 1 is provided with a check valve 10 and a float-type backflow prevention valve 20, these being installed in this order as one proceeds from upstream to downstream. The check valve 10 comprises a valve seat 15 that causes a location toward the float-type backflow prevention valve 20 and a location upstream therefrom in a wastewater drainage system to be placed in mutual communication; a valve member 14 that closes the valve at the valve seat 15 due to an upwardly directed restoring force and that opens the valve at the valve seat 15 as a result of being made to fall when the restoring force is overcome by a hydraulic head of wastewater flowing thereinto from a location upstream therefrom; and a restoring force exerting means 13 that exerts an upwardly directed restoring force on the valve member 14; wherein the components responsible for causing closure of the valve at the valve seat 15 by the valve member 14-which include the valve seat 15, the valve member 14, and the restoring force exerting means 13-are formed from metal(s). The float-type backflow prevention valve 20 comprises an annular valve seat 21 that causes a location downstream therefrom in the wastewater drainage system and a location toward the check valve 10 to be placed in mutual communication; a float 24 that rises in accompaniment to a rise in a water level of wastewater to close the valve at the annular valve seat 21 and that falls in accompaniment to a fall in a water level of wastewater to open the valve at the annular valve seat 21; a guide member 22 that guides movement of the float 24 in a vertical direction; and a constraining member 23 that constrains a lowermost position to which the float 24 can move.
BACKFLOW PREVENTION APPARATUS
VORRICHTUNG ZUR RÜCKFLUSSVERHINDERUNG
APPAREIL DE PRÉVENTION DE RETOUR D'ÉCOULEMENT
NISHIYAMA TOSHIMASA (author)
2019-06-12
Patent
Electronic Resource
English
Backflow prevention cover and backflow prevention apparatus comprising the same
European Patent Office | 2019
Backflow prevention cover and backflow prevention apparatus comprising the same
| European Patent Office | 2018