HNA offers replacement piston rubbers, which are ideally suitable for either oil-base or water-base mud, and can be ensured universal interchanged ability. When you have a chance to examine them, you will not be surprised to agree that Max Running at... - Update: 2007-03-20

AQingdao HNA Oilfield Equipment Manufacturing Co., Ltd./. We are a large drilling tools, mud pump and Fluid End Expendables and mud pump spare parts manufacturer in China. HNA is a comprehensive machinery manufacturer, whose products cover petrole... - Update: 2009-06-03

stem-guided valve & cross-arms seat features an extra wide metal to metal seal on the valve flange. The serrated upper surface on the valve gives a longer non-breathing seal between valve body and insert while the rigid seat cross-arms give greater s... - Update: 2007-05-10