Valve plug assembly and seat ring for regulator

A fluid control device, comprising:

• a valve body defining a flow path for a fluid;
• a seat ring disposed within the flow path and having a seating surface, the seating surface of the seat ring having a primary portion with a primary angle extending any one of at or between 20 degrees to 45 degrees from a longitudinal axis (A) of the seat ring, and a secondary portion extending from a bottom end of the primary portion so as to form an obtuse angled recess facing the sealing surface of the sealing disk at a non-parallel angle from a lateral axis (B) of the seat ring;
• and
• an actuator coupled to the valve body including a control assembly adapted for displacement relative to the seat ring for regulating a flow of the fluid through the flow-path, the control assembly including a mounting portion and a valve plug assembly coupled to the mounting portion and adapted to sealingly engage the seat ring, the valve plug assembly comprising:
• a valve plug having a cylindrical body, an annular flange radially extending from the body, and a sealing disk disposed within the annular flange, the sealing disk having a sealing surface adapted to engage the seating surface of the seat ring, and
• a retainer coupled to the valve plug to secure the valve plug to the mounting portion, the retainer having a body with a first portion, a second portion, and an annular side extending from the first portion to the second portion at any one of 30 degrees to 45 degrees.