Valve of taking a sample that travels empty is exempted from in oil well theftproof

The utility model provides a valve of taking a sample that travels empty is exempted from in oil well theftproof, includes: drain pipe (1), casing (2), case (3), seal cover (4), set screw (5), disk seat (6), copper sheathing (7). Characterized by: valve of taking a sample that travels empty is exempted from in oil well theftproof casing (2) are the cylinder, and through-hole right-hand member undergauge is equipped with the internal thread, and with case (3) thread connection, the left end is equipped with external screw thread and disk seat (6) female connection, and fixed by set screw (5), casing left end lower part is equipped with slant liquid outlet (0), is equipped with slant drain pipe (1) on liquid outlet (0). The utility model is suitable for a moisture chemical examination of oil well crude oil sample, convenient operation opens the direct record of valve and draws oil sample, and the admission data is accurate, avoids oil, gas loss and environmental pollution, lightens post workman intensity of labour, and has the theftproof function, prevents effectively that crude oil is stolen.