... , awarded the national patent. 2,ISO9001:2008 standard. Constant Head/ Check valve For Diesel Pump1,IntroductionIt is a new authorized ... safety and running high efficiency2,Application of this constant head/check valveIt solves problems on application of pumps in ... , fuel solenoid, charger for engine start battery, actuator, speed controller, load sharing panel and so on.4, CertificateOur products are ...