Valve for sampling in bore top for pumping well

The utility model relates to a wellhead sampling valve for a pumping well, which comprises a tubular valve body, a moving valve core, a tubular valve rod, a tubular valve rod positioning screw cap, a valve core return spring and a valve core return spring base, wherein the middle part of the tubular valve body is provided with an annular lug bass, the rear part of the tubular valve body is provided with a valve core return spring cavity, and the side wall is provided with an oil inlet of the valve core return spring cavity; the valve core return spring base and the rear part of the tubular valve body are in screwed connection, and the moving valve core is arranged at the connecting place of the tubular valve body hollow cavity in the tubular valve body and the valve core return spring cavity; the valve core return spring is arranged in the valve core return spring cavity, the rear part of the tubular valve rod is arranged in the tubular valve body hollow cavity, and the rear end of the tubular valve rod is inserted with the moving valve core together; the tubular valve rod positioning screw cap and the front part of the tubular valve body are in screw connection together. The utility model has the characteristics that the integral thermal insulation does not need carrying out, the thaw can be realized easily and the well does not need stopping when the disassembly and the thaw are carried out.