Roots pump troubleshooting common failure

1. Symptom: Pumping motion reasons:
(1) into the valve spool break, so that the valve is not open (2) there is water in the cylinder (3) rocker pin off or tapered pin cut off (4) gas cylinder piston ring damage (5) cylinder wear gap (6) valve plate, poor co.......

Russian water meter imports accounted for 45% in 2011

Introduction: In 2007-2011, Russia's water meter sales increased from 4.4 million to 7.7 million. According to the analysis, the continuous increase in the service fees for housing and public utilities has boosted the sales of water meters. In 2011, the proport.......

New Catalysts to Promote Hydrogenation and Decreasing Process

The Sinopec Fushun Research Institute of Petroleum and Petrochemicals has demonstrated its expertise in the field of hydrogenation technology. Recently, it has developed a FDW-4 hydrogen depressant catalyst and a FC-18 hydrogenation catalyst that meets the requirements of hydrogenation and dewa.......