| 主权项 |
1. A valve actuator assembly comprising:
an upper actuator casing; a lower actuator casing coupled to the upper actuator casing, the lower actuator casing having a spring aperture; a diaphragm disposed between the upper actuator casing and the lower actuator casing; a diaphragm plate disposed between the diaphragm and the lower actuator casing, the diaphragm plate having a top surface and a bottom surface, wherein a lower surface of the diaphragm engages the top surface of the diaphragm plate, and wherein a stem projection downwardly extends from the bottom surface of the diaphragm plate; a spring housing extending along a longitudinal axis, the spring housing having an inner surface defining an interior volume, the spring housing further having an open first end, wherein the open first end of the spring housing is coupled to the lower actuator casing adjacent to the spring aperture; an actuator stem extending along the longitudinal axis and secured to the stem projection of the diaphragm plate such that a displacement of the diaphragm plate results in a longitudinal displacement of the actuator stem, the actuator stem extending through the spring aperture of the lower actuator casing and at least partially into the interior volume of the spring housing; a guide member having a first end and a second end, the guide member having a side wall that extends along the longitudinal axis from the first end to the second end, the guide member further having a top wall disposed normal to the longitudinal axis at the first end of the guide member, the top wall having a center aperture, wherein at least a portion of the side wall adjacent to the second end of the guide member is received into the spring aperture of the lower actuator casing and within the interior volume of the spring housing; a spring having a first end and a second end, the second end of the spring being fixed relative to the spring housing and the first end of the spring engaging a bottom surface of the top wall of the guide member, wherein the spring biases the top wall of the guide member into engagement with the bottom surface of the diaphragm plate such that the stem projection is received into the center aperture of the top wall of the guide member, wherein an outer surface of the side wall of the guide member is adapted to engage the inner surface of the spring housing to limit displacement of the diaphragm plate and the actuator stem in a direction normal to the longitudinal axis, the outer surface of the side wall being free of any protrusions extending in the direction normal to the longitudinal axis. |
