Pump packing structure

The utility model discloses a valve cover for sealing a pump, particularly a spring valve cover which can be stretched and contracted. The utility model changes the primary steel valve cover into the spring valve cover which can be stretched and contracted. When liquid enters from a liquid inlet, a valve ball and the valve cover can synchronously generate displacement, and the ball and the cover can not generate any collision. Therefore, the utility model can prolong the service life of the valve portions. Additionally, when a plunger is moved to reach a top dead point, a liquid passing hole can be closed by the valve ball in time under the elastic action of the spring valve cover. Thereby, the utility model also well solve the problems that the primary dead point leaks liquid, and the pumping efficiency is improved. The utility model is an ideal substitute product of the existing valve cover.