Proportional valves conditions of use, maintenance and preservation of hydraulic valves with the same ordinary, extraordinary good performance.

Entirely performance evaluating experiments show that: surfactant sludge controlling agent has good thermal stability, anti-shearing, anti-pollution.

In this paper, the surface graft polymerization of porous membrane in supercritical carbon dioxide (SC CO_2) was proposed to improve the hydrophilic and antifouling properties.