Madera Canal Headworks Low Flow Valve

Friant, CA


Project Details

There are seven 96-inch hollow jet valves located at Friant Dam; four at the San Joaquin river outlet, two at the Friant-Kern canal outlet, and one at the Madera canal outlet. These valves play a vital role in water deliveries and flood control operations, so it is crucial for them to be in good and reliable operating condition.

To ensure their functionality, the valves undergo a thorough overhaul every four years due to factors such as lubricant deterioration, scale build-up, rust, and water intrusion. In this project, the existing 96-inch diameter hollow-jet valve, motor operator, adapter, and associated parts were removed and relocated to an on-site storage location. The exposed outlet pipe flange was cleaned, and a motor-operated 60-inch fixed-cone valve, transition, and backwater bulkhead adapter plate were furnished, installed, and tested. BCI efficiently handled the removal, transportation, and storage of the existing jet valve.

The valve components were disassembled, leaving only the valve body which was safely secured to a trailer. After unloading at BOR storage, the components were reassembled. The installation of the new valve was carried out using the existing government overhead gantry crane. The fixed cone valve was installed in four separate components: valve/hood spool assembly, transition spool, hood, and dismantling flange.

Once the installation was complete and all bolts were properly torqued, touchup paint was applied, and the floor grating and backwater bulkhead were reinstalled. Additionally, the backwater bulkhead adapter plate was installed along with a new gasket.