JPS6449775A - Supply/discharge circulating valve - Google Patents

Abstract

PURPOSE:To make it possible to perform a supply/discharge circulation with a single valve used for hydroponic planting or the like by providing a liquid supply port on the lower part of the valve housing, liquid discharge port on the upper part, and supply/discharge port on the side of the valve hausing, thereby selectively opening/ closing the liquid supply port and liquid discharge port by means of the valve body capable of floating. CONSTITUTION:Between a valve seat 2' located at a liquid supply port 2 opened on the lower part of a valve housing 1 and a valve seat 3' located at a liquid discharge port 3 opened on the upper part, a shperical valve body 4 capable of floating is inserted and a supply/discharge port 5 is opened on the side of the space between the liquid supply port 2 and liquid discharge port 3. An overflow control plate 9 is arranged, being movable in the vertical direction, by a screw shaft 7 attached on plural supporting plates 6', in a liquid discharge pipe 6 having the liquid discharge port 3. As liquid manure is press-fed from the liquid supply port 2, the shperical valve body 4 is brought in contact with the valve seat 3' of the liquid discharge port 3 so that the liquid manure is made to flow in a planting bed. As the pressfeeding is stopped, the valve body 4 is droped by its dead weight resulting in closing the liquid supply port 2 so that the liquid manure inside the planting bed is discharged from the liquid discharge port 3.