time, the pump body should be to filled with the solution, unnecessary to fill water or pumping vacuum and operation industry after the frequent starting, quite convenient. This item product is widely applicable for chemical industry, petroleum, pharmacy, pesticide, dye, paint, smelt, paper-making, electric-plate, food etc industries. Seal with British Grand packing company and foreign joint production of mechanical seal, since the trial, production and use of a few years in the market enjoy a