A admission valve for screw vacuum pump

The utility model relates to an admission valve for screw vacuum pump, including the valve body the top of valve body is equipped with the induction port, and the below is equipped with the gas vent one side of valve body is passed through connecting device and is linked to each other with servo cylinder servo cylinder lower extreme is equipped with the oil gas bucket, the low tension side and the preceding pump -line of valve body of servo cylinder communicate with each other, the high -pressure side and the oil gas bucket of servo cylinder communicate with each other the symmetry is equipped with the dabber in the valve body the spindle cover has non return valve plate and balancing weight, connecting device includes valve rod, connecting rod and joint bearing, the connection of connecting rod is connected with valve rod and joint bearing respectively. The utility model has the advantages of rational in infrastructure, the performance is firm, can the effective control starts the load at initial stage, has both practiced thrift the cost of equipment, and also the relative ratio is lower for the running cost of vacuum pump, has played energy -conserving effect.