| 主权项 |
1. A valve, comprising:
a valve body, the valve body having a through hole that passes through a wall of the valve body from an outer wall surface to an inner wall surface, wherein a proximal end of the through hole is an opening in the inner wall surface and a distal end of the through hole is an opening in the outer wall surface, wherein the through hole comprises:
a body gland section positioned proximal to the outer wall surface, wherein the body gland section has a circular cross-section having a first radius,a body midsection having a circular cross-section having a second radius, anda lower seat positioned between the body midsection and the inner wall surface, wherein at least a portion of the lower seat has a third radius, wherein the second radius is smaller than the first radius, wherein the second radius is smaller than the third radius; a valve stem; wherein the valve stem comprises:
a head proximate a proximal end of the valve stem,a stem midsection having a circular cross-section,a stem gland section, wherein at least a portion of the stem gland section has a circular cross-section, wherein the stem midsection is between the head and the stem gland section; and a lower bearing cup, wherein the valve body and the valve stem are adapted such that a distal end of the valve stem can enter the proximal end of the through hole and pass into the through hole such that at least a portion of the head is in the lower seat, wherein at least a portion of the head has a head radius that is larger than the second radius, wherein the head and the lower seat are adapted such that the lower bearing cup can be positioned such that the lower bearing cup prevents contact between a head outer surface and a lower seat inner surface when the valve stem is fully inserted into the through hole, wherein the lower bearing cup comprises a first portion and a second portion, wherein when the valve stem is fully inserted into the through hole the lower bearing cup is positioned such that at least a portion of the first portion is between the head and the body midsection and the second portion is positioned between the body midsection and the stem midsection, wherein the second portion constrains lateral movement of the head with respect to the lower seat, wherein the stem gland section and the body gland section are adapted such that a stem seal can be positioned around the stem gland section so as to be in contact with a stem gland section outer surface around a circumference of the stem gland section and when the valve stem is fully inserted into the through hole the stem seal is positioned in a stem seal gland, wherein the stem seal gland is formed by the stem gland section outer surface, a body gland section inner surface, a proximal stem seal gland face, and a distal stem seal gland face, wherein the proximal stem seal gland face is a distal face surface of the body midsection, wherein when the valve stem is fully inserted into the through hole, the stem seal is positioned around the stem gland section so as to be in contact with the stem gland section outer surface around a circumference of the stem gland section, the stem seal is positioned in the stem seal gland, and a pressure differential is applied between a first region distal to the outer wall surface and a second region proximal to the inner wall surface such that a first pressure of the first region is higher than a second pressure of the second region, a first seal is created between the stem seal and the stem gland section outer surface and a second seal is created between the stem seal and the body gland section inner surface, such that the pressure differential between the first region distal to the outer wall surface and the second region proximal to the inner wall surface is maintained, wherein the first seal and the second seal are maintained as the valve stem is rotated about a longitudinal axis of the valve stem with respect to the valve body. |
