The invention discloses a manufacturing method of a high-efficiency low-
noise piston compressor valve plate. A compressor comprises an air
cylinder head assembly, wherein a crescent-shaped air suctionport is formed in the valve plate and is a crescent-shaped through hole; and the valve plate is a
powder metallurgical part. The technological process of the valve plate manufacturing method comprises the steps of
powder mixing,
compression molding through a die, high temperature
sintering, shaping, inspection and steam treatment. By adopting the above technical scheme, pressure losses are reduced, and the compressor energy efficiency ratio is increased; the
airflow velocity at an air inlet is decreased, a valve block is opened in a slow-down mode, and valve block displacement is reduced; meanwhile, the valve block lift is reduced,
impact to a limiting plate and a
valve seat is reduced, and
noise of the valve block is reduced from the source; in addition, valve block displacement is reduced, stress to the
waist of the valve block is reduced, thus, the
critical stress zone area of the valve block is decreased, and the reliability of the valve block is improved; and the energy efficiency ratio is increased,
airflow noise is reduced, and the reliability of the compressor is improved.