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； Self − induced vibration is possibly caused by the semi − closed pipeline combining the automatic pressure regulator with the automatic constan 田 ow valve ， Thus ， a test was conducted on the site to analyze the generation of the coupled osciUation between the automatic pressure regulator and the direct − acting constant fiow valve ． Fumher ， the investigatiou was conducted j 皿 order to show the function of the constant flow valve ， obtain self −excited oscillation ， and to study the control measure ． Consequenlly ， when the direct − acting constant fl ow yalve is used near the setting flow ， the working mechanism activates血 e valve using the pipe pressure and the large selfLexcited oscillation can be induced． On the other hand， when the flow is smaller than that of the setting fiow of the d廿ect − acting constant flow valve ， the self − excited oscillation is not generated ． Further ， with regard to the measures to control self − excited oscillation ， it is known that self − excited oscillation is net completely restrained by merely blunting the response sensitiVity of the automatic pressure regulator ． κ eywords ； 5 θ履 一 d ・ sed pip ・line ； Aut・ matic ・ pre∬ ure ・eg ・ lat ・ r； Aut・鰄 た ・ … tantfl ・W ・ va ' レe ； Self − induced・め ・α 一 t' on ； Direct − acting constantflo 脚 alve

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