Well head theftproof preventer

The utility model discloses a well head theftproof preventer, it includes inside hollow main part, main part one end is formed with and is used for the top connection be connected with theftproof helmet and last plug, the casing coupling sealing connection of the other end and oil gas well, be equipped with an inside hollow lead screw in the main part inner chamber, the inside one end of being close to the top connection of lead screw is formed with and is used for the taper pipe thread be connected with kill -job nipple joint head, the other end is equipped with the spring pedestal that is formed with the through -hole on the terminal surface, the inside intermediate position of lead screw still is equipped with a ball seat, the ball seat middle part was formed with the liquid hole, still be equipped with steel ball and spring between ball seat and the spring pedestal, the diameter of steel ball is between the internal diameter and external diameter of ball seat, the steel ball can be sat and seal on the ball seat under the squeezing action of spring. The utility model discloses a device theftproof function is strong, can be at any time carry out pressure monitoring to the oil -water well, it is succinct, convenient, again can be reliable control hidden danger well, abandoned well.