1 W-type vacuum pump before the test preparation 1.1 Lubrication points and crankcase according to the provisions of lubricating oil, grease. 1.2 Check the auxiliary equipment, pipeline valves and instruments installed is good. 1.3 Check the tightness of the ministries are fastened. Security guards are solid and reliable. 1.4 Check the cooling water is smooth. 1.5 disc check whether there is any abnormal phenomenon. 1.6 Open vent valve and exhaust valve, close the intake valve. 2 W-type vacuum pump test 2.1 Immediately after starting the parking, check the direction of operation, confirm the correct and then restart. 2.2 Close the vent valve, listen to the cylinder and crankcase with or without impact and other abnormal sound, check the vacuum gauge, ammeter indicates normal. 2.3 Check cooling and lubrication system is working properly. 2.4 degree of vacuum to meet production requirements. 2.5 check the ministries temperature. 2.5.1 Cooling water outlet temperature does not exceed 35 ℃. 2.5.2 eccentric ring temperature does not exceed 50 ℃. . 2.5.3 valve temperature does not exceed 90 ℃. 2.5.4 Rolling and plain bearings temperature does not exceed 75 ℃ and 65 ℃. 3 W-type vacuum pump acceptance inspection quality in line with the requirements of this procedure, maintenance records complete and accurate, 2-4 hours after the load operation, after checking the normal operation of various ministries, technical performance is good, to nameplate output or capacity to identify, according to the provisions of the acceptance procedures , Transfer of production.