Automatic pressure relief and pressure test valve of underground pipe column of oil-water well

摘要: The utility model discloses an automatic pressure relief and test valve of underground pipe column oil-water well, which is used for columns with a packer water distributor injection well needing during leakage-finding plugging operations. comprises upper connecting cylinder, core, seat lower wherein flow channel arranged in the cylinder internally provided core seat. has simple structure convenience operation, efficiently solves problem that original fixed check cannot relieve automatically, special oil drainage device necessary protects environment efficiently, avoids pollution, achieves reliable sealing performance as adopt conical surface rigid manner, can be repeatedly, saves cost remarkable economic benefits social benefits.