... CastingFeature of double ram bopRam BOP is mainly composed of housing, side gate, hydro-cylinder, cylinder cap, piston, ... on the ram. The floating top rubber core can increase the seal reliability. A leading block,which ... - Guide rib in the ram chamber of the housing can limit the moving direction of the ram.7- ... The two-way seal of piston rod can prevent the inter-leakage between well fluid and ...