Pressure regulator

A fluid pressure regulator for sprinklers, or the like, comprising in combination:

• a housing having a passageway therethrough, said housing having internal threads formed on at least a portion of said passageway;
• biasing means supported in said housing passageway;
• pressaure adjustment means for varying the pressure of fluid passing through said housing said pressure adjustment means including a throttling stem and throttling stem seat, said athrottling stem having a passageway therethrough and being movably mounted to respond to the pressure difference in the fluid in said fluid regulator against the bias of said biasing means to thereby move into and out of said throttling stem seat to regulate the pressure of the fluid passing therethrough;
• and
• means to dampen oscillations in said pressure adjustment means throttling stem by limiting access of fluid passing through said fluid pressure regulator to an area adjacent one end of said throttling stem, said means to dampen oscillations in said pressure adjustment means including a pressure controller member mounted in said housing passageway having a portion thereof sliding in said throttling stem to form an annular cavity over the top of said throttling stem, and in which said pressure controller member allows the movement into and out of said annular cavity formed by said pressure controller member in said housing adjacent the top of said throttling stem, and in which said pressure controller member has an annular surface sliding in an annular surface in said throttling stem and allowing an annular space therearound for the ingress and egress of fluid into and out of said annular chamber formed adjacent the top of said throttling stem to reduce rapid changes in pressure in said annular chamber and rapid movements of said throttling stem.