Kuyesa Kuthetsa Mavuto a Actuator ndi Kuyesa Kupanikizika kwa Valve Yamagulugufe Awiri Osasinthika Mfundo Yogwira Ntchito ya Valavu Yamagulugufe Yawiri Yopanda Kawiri Valavu ya Gulugufe Yozungulira VS Yozungulira Valavu ya Gulugufe ya AWWA C504 U Double Eccentric
