초록 ▼

A flow control valve is disclosed wherein a housing defines a flow chamber with an inlet and an outlet. Disposed within the flow chamber is a telescoping poppet comprising an inner poppet and an outer poppet. A first spring is selected to bias the outer poppet to seal closed the inlet below a predet

A flow control valve is disclosed wherein a housing defines a flow chamber with an inlet and an outlet. Disposed within the flow chamber is a telescoping poppet comprising an inner poppet and an outer poppet. A first spring is selected to bias the outer poppet to seal closed the inlet below a predetermined fluid flow rate. Above the fluid flow rate, the force of the fluid against the outer poppet compresses the spring, breaking the seal and allowing fluid to flow into the fluid flow chamber. Inside the outer poppet is an inner poppet which telescopes from the outer poppet. A second spring biases the inner poppet predominantly within the outer poppet, but an increased pressure in the outer poppet collapses the second spring and extends the inner poppet in a fully extended position. Fully extended the inner poppet seals shut the outlet of the fluid chamber. In operation, the first spring shuts the valve below a predetermined flow rate guaranteeing zero flow until a minimum flow rate is present. Furthermore, if a leak occurs downstream (beyond the outlet) or the flow rate is above a predetermined maximum flow rate the second spring is collapsed by an upstream/downstream pressure differential causing the inner poppet to seal the outlet. Thus, the valve operates only between a minimum and maximum flow rate and seals in the event of a downstream leak.

대표청구항 ▼

1. A flow control valve comprising:a housing defining a flow chamber therein including an inlet and an outlet; a telescoping poppet located in the flow chamber comprising a hollow outer member and an inner member anchored within the outer member and extendable therefrom; a first biasing element for

1. A flow control valve comprising:a housing defining a flow chamber therein including an inlet and an outlet; a telescoping poppet located in the flow chamber comprising a hollow outer member and an inner member anchored within the outer member and extendable therefrom; a first biasing element for biasing the outer member of the telescoping poppet toward the inlet; and a second biasing element for biasing the inner member of the telescoping popper within the outer member.