The invention relates to a high-pressure charging valve body. The high-pressure charging valve body comprises a cylinder, a
piston, a connecting sleeve, a first
needle valve and a second
needle valve,wherein one end of the
piston is arranged in the cylinder, one end of the connecting sleeve sleeves one end, on which the
piston is arranged, of the cylinder, the other end of the connecting sleeve is in threaded connection with the piston, the piston rotatably moves in the cylinder, the piston is in dynamic seal matching with the cylinder, the first
needle valve is arranged on the end, which isfar from one end of the piston, of the cylinder, the second needle valve is arranged on the side wall of one end, which is sleeved by the connecting sleeve, of the cylinder, and the first needle valve, the cylinder and the second needle valve communicate with one another. According to the high-pressure charging valve body, the piston is in threaded fit with a connecting piece, so that the piston rotatably moves, the reaction of high-pressure air in the cylinder can be prevented, all air in the cylinder is extruded, the accurate is high, the
high pressure is resistant, the operation is flexible, and milligram
trace gas can be continuously added for many time by designing the appropriate size, so that accurate measurement of the gas flow is realized. In addition, the invention further provides a high-pressure charging
system which adopts the high-pressure charging valve body.