1, All bearings import from Japanese NSK to ensure the precise orientation of impeller and high stability during the running. 2, The material of the impeller is welded with nodular iron or steel to ensure the high stability and increase the lifetime of the vacuum pumps greatly during any harsh conditions. 3, The pulley (when the vacuum pump systems is driven by the belt) adopts standard high precise taper bushing pulley to keep the reliable running and increase the lifetime; also it is easy to dismantle. 4, The coupling (driven directly) adopts standard high strength elastic product. The elastic element is made of polyurethane to keep the reliable operation and long lifetime of the vacuum pump. 5,The pump body is made of steel or stainless steel to increase the lifetime of the vacuum pump system five times than normal material 6,The shaft sleeve as the most easily damaged part, our shaft sleeve is made of stainless steel to increase the lifetime of the pump 5 times than normal material. 7, Special separator built-on the vacuum pumps for sale can save the space and reduce the noise efficiently. 8, All the parts are cast by the resin sands with great quality, no puttying. Keep the heat dissipation is the best. 9,Import all the mechanical seals (optional) to fully ensure the pump in the long-running process without leakage.