| 摘要 |
A valve system comprising a valve design in which the valve is normally closed is disclosed. The normally closed valve can comprise a circular valve seal face formed by the underside of a rim of an elastomeric valve boss and a circular valve seat, which is formed by the rim of a through-hole molded into, for example, a plastic cassette, such that the valve seal face, the valve seat, and the through hole are concentric. The valve boss can be a hollow “mushroom” shaped valve boss, or a conical-shaped valve boss. If no force is applied to the inside surface of the valve boss, no fluid can pass through the valve as the valve seal face rests against the valve seat as a result of the steady free-state load created by the stretch of the valve boss over the slightly longer through hole. When a force is applied to the inside surface of the valve boss, the valve seal face is displaced from the valve seat, allowing fluid between the valve seal face and valve seat and then to pass between the valve boss and the inside surface of the through hole. |
| 主权项 |
1. A valve system comprising:
a housing containing a fluid inlet channel and a fluid outlet channel, wherein the fluid inlet channel and the fluid outlet channel are connected by a through-hole; and an elastomeric valve boss having a hollow elastomeric cylindrical portion forming an interior cavity and a head portion, the cavity including an opening at a first end of the elastomeric cylindrical portion opposite the head portion, the elastomeric cylindrical portion extending concentrically through the through-hole such that, under static conditions, a rim on an underside of the head portion of the valve boss forms a valve seal face that maintains contact with a rim of the through-hole preventing fluid flow through the through-hole, the rim of the through-hole forming a valve seat, the valve boss having an open position wherein the elastomeric cylindrical portion is axially stretched by application of a force to an interior surface of the cavity to displace the valve seal face from the valve seat to form a gap therebetween resulting in a fluid connection through the through-hole between the fluid inlet channel and the fluid outlet channel. |
