US 4,230,147 A · Constant flow valve

Abstract

A dispensing valve mechanism includes means for automatically maintaining a constant flow of fluid through a flow channel under varying fluid source pressure and and utilizes a piston movable within a chamber in response to fluid pressure to regulate the available flow area of a single outlet port in the chamber. The piston is sized to permit fluid flow around the periphery of the piston, and may have an axial flow path therethrough to serve as the primary flow path through the valve mechanism. A spring yieldably opposes axial movement of the piston that would tend to decrease the effective area of the chamber outlet port. An adjustment screw is carried in the valve body for adjusting the force exerted by the spring. The valve is particularly suited for use in liquid dispensing apparatus.

Claims8

Dependent claims

A mechanism for automatically maintaining a uniform rate of fluid flow in a flow channel under varying pressures of a fluid source, comprising:

(a) a chamber forming part of said flow channel having an inlet port and a single outlet port through the side wall of the chamber;
(b) a piston disposed within said chamber sized to permit fluid flow around the periphery of the piston, said piston being axially displaceable within said chamber in response to the pressure of the fluid introduced into the chamber through the inlet port and radially displaceable by flow generated forces to maintain contact with the side wall of said chamber in the region of said single outlet port to establish sliding contact of said piston over said outlet port to produce closure action of said outlet port;
and
(c) spring means for yieldably opposing axial movement of said piston toward said outlet port.

1 more element

Dependencies are inferred from the claim text.

Constant flow valve

Life of this patent

Constant flow valve

Life of this patent

Abstract

Claims8