Water leak valve

Claim 1

In a surface irrigation system consisting of at least one pipe including a longitudinally extending bore and at least one communicating and radially extending bore, a water leak valve comprising a member including a longitudinally extending bore terminating at opposing ends in first and second openings with at least the portion of said bore adjacent said second opening provided with internal threads, an outwardly extending flange on said member, said member inserted in said radially extending bore in said pipe until stopped by said flange, said first opening in said member communicating with said longitudinally extending bore in said pipe, said member secured in said pipe by transversely extending means at least partially passed around said pipe and at least partially passed around said flange, a valve comprising first and second sections of external threads, said first section comprising at least two complete helices, said second section comprising a longitudinally extending and angularly inclined flat with not less than one half of each of said external threads removed at any transverse plane along the length of said second section whereby adjustment of said valve provides an opening between said flat of said valve and said second opening in said member through which liquid may be metered.