Fecha de publicación: 25/05/2021 Fuente: Wipo Olive Table The utility model discloses a combined valve piece which comprises a first valve piece and a second valve piece which are arranged in a valve body, a first exhaust hole and a second exhaust hole which are communicated with the inside and the outside of an oil tank are formed in the top of the valve body, and the first valve piece used for achieving opening and closing of the first exhaust hole and the second valve piece used for achieving opening and closing of the second exhaust hole are arranged in the valve body. The first valve piece is elastically arranged in the valve body through the first spring and opens and closes the first exhaust hole through lifting, a concave table is machined on the side portion of the first valve piece, and the second valve piece is elastically arranged on the concave table through the second spring and opens and closes the second exhaust hole through lifting. The first valve piece comprises a valve block movably arranged at the top of the first floater, the periphery of the valve block is wrapped with a protective sleeve, the sealing gasket is replaced with the valve block with the protective sleeve, sealing is more reliable, and the sealing performance is enhanced.