The check valve has requirements on the installation method. The function of the check valve will block the reverse flow of the media in the pipeline, so the front and rear designs are very different. If it is the installation direction, the valve is used normally, and there is no way. Cracks in check valves are the more common phenomenon, and thermal cracking is common. Design requirements basically do not allow major changes to the valve body, and can only be improved through process. Put appropriate sawdust in the core sand of the check valve and paint it. The core method and the sand core of the check valve body need to be hollowed out and filled with straw at a distance of 20-30 mm from the sand core to improve the concession of the core. sex.
Treat the dark cold iron at the two armpits of the valve body to make the solidification rate as the same as the thin wall as much as possible, so as to overcome the difference in dead heat conditions between the two armpits, causing serious problems of overheating and reducing the tendency of cracks. The body of the check valve body water explodes too early, the temperature is too high, and cracks are easy to occur, and it is difficult for the water to explode too late, so in order to prevent the occurrence of cracks, this casting simply does not perform water explosion.
