He served as a deputy representative to the Norwegian Parliament from Bergen during the terms 1965–1969 and 1969–1973.
From August to September 1963 he was Minister of Wages and Prices during the short-lived centre-right cabinet Lyng.
He was elected to Norwegian Parliament for this party in 1973, this time from Hordaland as Bergen had ceased to be a county and as such constituency.
On the local level Myrvoll was a member of the executive committee of Bergen city council from 1947 to 1955 and 1974 to 1975.
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