Check valve and leak indicator

Claim 1

A high pressure steam valve including A. a valve body comprising: 1. an elongated valve chamber, including: a. an inlet port at one end of said chamber, 1. an annular valve seat surrounding said inlet port b. an outlet port opening in the side wall of said valve chamber at a point in spaced relation to said inlet port and extending through the side wall of said valve body, B. an elongated valve closure in the form of a cylindrical plug, and a circular compression ring surrounding said cylindrical plug, said cylindrical plug being fitted in said valve chamber for axial reciprocating movement in said chamber between 1. full closed position seated against said annular valve seat 2. full open position at a point past said outlet port, 3. a leaking position wherein said compression ring surrounding said cylindrical plug is past the level of the lowest part of said outlet port thereby allowing a small leak to occur, and at 4. intermediate points therebetween C. a spring, mounted in said valve chamber and biased at the top against the top of said valve chamber and at the bottom against said cylindrical plug for urging said cylindrical plug toward said full closed position, D. the further combination therewith of indicator means responsive to the axial movement of said cylindrical plug to indicate the position of said cylindrical plug and visibly indicate the position of said cylindrical plug at said leaking position.