Gravity Controlled Centrifugal Governors:

Commonly there are three utilized gravity controlled centrifugal governors:

(1)        Watt governor

(2)        Porter governor

(3)        Proell governor

Watt governor does not carry dead weight at the sleeve. Porter governor and proell governor contain heavy dead weight at the sleeve. In porter governor balls are located at the junction of lower and upper arms. In case of proell governor the balls are located at the extension of lower arms. The sensitiveness of watt governor is weak at high speed and this restricts its field of application. Porter governor is more sensitive in compare of watt governor. The proell governor is most sensitive and of these three.