... the national patent. 2,ISO9001:2008 standard. Constant Head/ Check valve For Diesel Pump1,IntroductionIt is a new authorized water ... overloaded2.6 When pump is stopped, ensuring pump and pipeline connection is cutoff to prevent water flowing back.3, Company ... regulator, fuel solenoid, charger for engine start battery, actuator, speed controller, load sharing panel and so on.4, CertificateOur products ...