Irrigation drain valve

Claim 1

In an improved irrigation drain valve, a tubular valve body having an upper, externally threaded inlet portion and a cylindrical inlet passage portion of a first predetermined diameter, the valve body also having a lower, elongated, cup-like outlet portion having a cylindrical outlet passage portion aligned with the inlet passage and of a second diameter substantially smaller than that of the inlet passage portion, the outlet portion being closed at the end thereof more remote from the inlet portion and having a bore through said end, the bore being axially aligned with the passage portions and being substantially smaller in diameter than said second diameter, the valve body also having a frustoconical valve seat portion connecting the outlet portion to the inlet portion, the outlet portion having laterally extending drain holes spaced substantially upwardly from said end of the outlet portion, a valve closure member including a frustoconical head adapted to engage the valve seat portion and a cylindrical stem extending along the outlet passage portion and being substantially smaller in diameter than the outlet passage portion, the portion of the stem and the outlet passage portion below the drain holes forming a turbulating area adapted to decrease force of water being discharged, said stem extending through said bore and including a threaded portion extending beyond the body, and including a nut screwed onto the threaded portion, spring means mounted on the stem and engaging the head and the bottom of the cup-like end portion and urging the head upwardly away from the valve seat portion, and an O-ring seal means positioned between the valve closure member and the frustoconical valve seat portion of the body member.