Valve piece for instrument

The invention discloses a valve piece for an instrument, and relates to the technical field of instrument equipment. The valve piece comprises a cylinder; a base is mounted on the cylinder; a feeder is mounted on the base; the two ends of the cylinder are connected with flat covers; gaskets with sealing structures are arranged between the flat covers and the cylinder; the middle part of the cylinder is vertically connected with a bushing; the bushing includes a left bushing and a right bushing; the left end part of the right bushing is connected with the cylinder, and the right end part is connected with a cylinder; the surface of a piston rod of the cylinder is coated with a sealing ring; the sealing ring is positioned through a first gland and a second gland; the left end part of the right bushing is connected with an end cover; the end part of the left bushing is connected with a cover plate; and discharge ports are formed in the radial direction of the left bushing and the flat cover at the top of the cylinder. The valve piece for the instrument can promote the working efficiency and the control precision.