bore 38 a valve member in the form of a spherical ball 44 is carried on the upper cooperating surface of the ball carrier 42 ball valve 44 is urged upwardly by the spring 40 toward a bushing 46 having a downwardly facing valve seat 48 the lower end of a flow control plunger or valve operating stem 49 extends downwardly through a bore passageway 50 in the valve housing 12 into the bushing 46 above the ball 44 the stem 49 has a flat surface 52 to permit lubricant to flow through the bushing 46 along the lower end of the stem there may be a slight clearance between the ball 44 and the lower end of the plunger in the position shown in fig1 to assure accurate seating of the ball a coil compression spring 54 positioned in the bore 50 is compressed between the upper surface of the bushing 46 and a washer engaging the lower end of an enlarged annular abutment 56 on the plunger the upward movement of the plunger 49 is limited by engagement of the upper end of the abutment 56 with a washer 58 retained in the bore 60 by means of a suitably packed bushing 62 threaded into the bore 60 the upper end of the plunger 49 extends upwardly through the bushing 62 an outlet extension 66 is threadedly received in an outlet bushing 64 threaded into an inclined outlet passage 68 in housing 12 communicating with main housing bore 50 the outlet extension 66 carries a.