Measurement of flow coefficient of poppet valve for drilling fluid

Experimental investigations were made on the flow coefficient of cone valve,ball valve and plate valve taking drilling fluid as the working media.The data and law of flow coefficient of poppet valve for drilling fluid were obtained in various situations by measuring flow and pressure at different opening of four structures of valve seats.The flow coefficient was compared with that of water valve.Results show that the angle and length of seat s chamfer have a significant effect on flow coefficient of cone valve and ball valve,and relatively slight influence on plate valve.The back pressure has an obvious influence on plate valve s flow coefficient.The flow coefficient of poppet valve for drilling fluid is larger than that of water valve.