507 排水ポンプ用逆流防止弁の動特性(OS4-2 流体における新技術開発-2)(OS4 流体における新技術開発)

Abstract

We investigated experimentally the dynamic characteristics of a check valve used in drainages. The function of the check valve is to check the reverse flow in the drain pipes when the drain pumps accidentally stop. When the check valve closes suddenly, large impact force arises on the drain pipes and check valves, and then water column separation occurs near the check valves and water-hammer phenomenon occurs in the drain pipes. To find the methods for reducing impact forces, we investigated the flow phenomena around the check valve; impact acceleration of check valve and downstream tank, pressure variation and movement of the check valve.