Abstract: A flow regulator is shown with the inlet aligned with the outlet and with external adjustment of the flow rate accomplished by movement of either the inlet or outlet fitting relative to the main body. A plunger and specially shaped stem regulate flow by engagement of the stem with an outlet hole, the shape of the stem being determined for a particular flow rate and correlated with the area of the outlet hole and the load per inch deflection characteristic of the spring, which biases the plunger toward the inlet, to give a constant rate of flow regardless of wide changes in supply pressure across the regulator. A compression gland, comprising an O-ring, washers and nut, affords locking means for the adjustable outlet.

Abstract: A flow control structure which is primarily intended to be utilized as a pressure compensating emitter in agricultural watering or irrigation can be constructed utilizing a housing having a flow control member located therein. The housing employed has an internal cylinder connected by a passage leading to a valve seat. The flow control member extends from the cylinder to adjacent to the valve seat. The extremity of the flow control member within the cylinder is formed as a piston so that the flow control member may be moved by fluid pressure. A channel means connects this first extremity of the flow control member with the interior of the passage at a point which is adjacent to and spaced from the other extremity of the flow control member. This other extremity is shaped so as to cooperate with the valve seat in order to limit flow between this other extremity and the valve seat in accordance with the position of the flow control member.