... national patent. 2,ISO9001:2008 standard. Constant Head/ Check valve For Diesel Pump1,IntroductionIt is a new authorized ... running high efficiency2,Application of this constant head/check valveIt solves problems on application of pumps in ... genset control system, e.g. engine controller, water preheater, automatic voltage regulator, generator synchronizer, genset controller, power factor regulator ...