Patent ID: 8590858

Claim:
A regulator, comprising: a valve body defining a flow-path for a fluid and having a valve seat; an actuator casing coupled to the valve body; a control member disposed within the actuator casing and adapted for displacement relative to the valve body and the valve seat for regulating a flow of the fluid through the flow-path by moving between an open position in which the control member is spaced apart from the valve seat and a closed position in which the control member engages the valve seat; and a spring operatively coupled to the control member and biasing the control member toward the open position, wherein a bottom surface of the control member includes a recessed surface facing the valve seat and a through-bore, the recessed surface being formed by a counter-bore having a larger diameter portion proximate the valve seat and the through-bore having a smaller diameter portion distal to the valve seat, the through-bore extending through the counter-bore.