virtual2017 ® 13-Jan-2019 19:11

Design and Selection of Check Valves


Year: 2018
Language: english
Author: Val‐Matic
Format: PDF
Quality: eBook
Pages count: 18
Description: An essential element in the design of water and wastewater pumping systems is the proper
selection of the pump discharge check valve, whose purpose is to automatically open to allow
forward flow and automatically return to the closed position to prevent reverse flow when the
pump is not in operation. Another function that is often overlooked is the valve’s ability to
minimize energy consumption. Patton estimated that water and wastewater plants in the
United States consume 75 billion kW∙h of energy annually and nearly 80% of that energy is
consumed for high service pumping costs to overcome the static head and friction losses. But
just as important, the valve should protect the pumping system and piping from pressure
surges caused by sudden closure. Every pump station designer has witnessed check valve slam,
which is caused by the sudden stoppage of reverse flow through a closing check valve. To
prevent slam, an automatic check valve must either close very quickly or close slowly by using
oil dashpot devices.

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