초록 ▼

A liquid flow control solenoid valve for a beverage dispensing system wherein a rolling diaphragm seal is used between a needle valve and the valve body and the increased hydraulic forces on the needle valve caused by the rolling diaphragm are balanced by using a needle valve that is tapered in a di

A liquid flow control solenoid valve for a beverage dispensing system wherein a rolling diaphragm seal is used between a needle valve and the valve body and the increased hydraulic forces on the needle valve caused by the rolling diaphragm are balanced by using a needle valve that is tapered in a direction to create a force on the needle valve in the direction opposite to the force created by the rolling diaphragm, so that the hydraulic forces are balanced and a smaller solenoid can be used to operate the valve.

대표청구항 ▼

A method for controlling the flow of liquid through a solenoid valve with the smallest possible solenoid comprising: (a) providing a valve body having a liquid passageway therethrough and including an inlet chamber and an outlet chamber with a flow control orifice therebetween including a valve seat

A method for controlling the flow of liquid through a solenoid valve with the smallest possible solenoid comprising: (a) providing a valve body having a liquid passageway therethrough and including an inlet chamber and an outlet chamber with a flow control orifice therebetween including a valve seat; (b) providing a solenoid operated needle valve movably positioned in said orifice between open and closed positions thereof for moving away from the inlet chamber and into the outlet chamber when said needle valve moves from its closed to its open position; (c) reducing the friction of a seal between said needle valve and said valve body by providing a rolling diaphragm therebetween, said rolling diaphragm forming a wall of said inlet chamber; and (d) reducing the net liquid force on said needle valve by providing said needle valve with a taper from a smaller to a larger diameter in the direction from said inlet chamber to said outlet chamber such that the liquid force on said needle valve in said inlet chamber created by said taper is in the direction opposite to the liquid force on said needle valve created by said rolling diaphragm, so as to balance out such forces to a desired minimum.