Flow Technology for Fish Ladder

1600mm DeZurik Eccentric Plug Valve Accurately Controls Flow For Fish Ladder Attraction Pool

A USA West Coast engineering firm has designing a fish ladder as part of a water supply project for a public utility district.

A fish ladder, constructed beside a dam, allows migratory salmon to bypass the dam and safely reach their spawning grounds upstream. The fish ladder creates a series of ascending pools that allow the fish to swim from pool to pool until they reach the river above the dam. Water flow at the proper velocity at the entrance pool of the fish ladder is critical to attracting fish to enter the fish ladder.

The client needed a control valve that would provide high flow capacity and handle the high velocity required by this application. The attraction water supply for the fish ladder design included a 66˝diameter pipeline with a control valve and separate isolation valve. The control valve was required to provide level control for the fish ladder supply pool water. The client maintains a six foot elevation head differential with the control valve to provide proper flow velocity across the fish ladder “steps” for the fish to swim up and over the ladder steps.

The DeZurik Eccentric Plug Valve was found to be an ideal control valve choice due to the high velocity and potential cavitation in this application. The maximum velocity at high flow was 38 feet / second with head pressure of 4 bar; because the eccentric plug valve features low dynamic torque and cavitation resistance, it could handle the velocity of the pipeline.

A butterfly valve was considered for the valve application, but was rejected due to the high velocity. All other valve designs the engineers considered required much more costly piping design to accommodate the high velocity and pressure drop.

A 66˝ DeZurik Eccentric Plug Valve with a gear unit and a modulating electric motor actuator with manual override was installed. The actuator was mounted on a floor stand connected by a 55 foot extension to the valve in the pipeline below the fish ladder.

The valve was installed per DeZurik’s recommendation with the plug shaft horizontal and seat downstream, flowto- close. This orientation was based on flow modelling to offer the longest valve service life. The 66˝ DeZurik Plug Valve met the customer’s complete list of goals by providing a reliable control valve solution that will endure the test of time.

For more information on the DeZurik plug valve contact the sales team at Flow Technology services.

Tel: 02890 841 004
Email: info@flowtechnologyservices.com
Web: www.flowtechnologyservices.co.uk

Published in Valve User Magazine Issue 36

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