초록 ▼

A fluid control valve has a valve member which, on closing creates a stagnation zone between the valve member and a surface within the valve. In the stagnation zone fluid pressure is greater than it is in an adjacent constriction zone. This causes the valve to close slowly, thereby reducing the like

A fluid control valve has a valve member which, on closing creates a stagnation zone between the valve member and a surface within the valve. In the stagnation zone fluid pressure is greater than it is in an adjacent constriction zone. This causes the valve to close slowly, thereby reducing the likelihood that water hammer will occur on closure of the valve. The design of the valve member also reduces resonances which can cause annoying noises and premature wear. A flow restriction chamber further slows closure of the valve. The fluid control valve may be controlled by a conventional 3-way pilot valve. Preferably the fluid control valve is used with a pilot valve according to the invention having a rocker member which, on actuation, first closes an inlet valve member and then opens an outlet valve member. The pilot valve may be used in other situations where a 3-way valve is needed.

대표청구항 ▼

[ We claim:] [10.]10. A fluid control valve comprising:a) a body having an inlet, an outlet and a fluid path extending between the inlet and the outlet;b) a chamber in the body, the chamber in fluid communication with a control port;c) a valve member movably disposed within the body for free motion

[ We claim:] [10.]10. A fluid control valve comprising:a) a body having an inlet, an outlet and a fluid path extending between the inlet and the outlet;b) a chamber in the body, the chamber in fluid communication with a control port;c) a valve member movably disposed within the body for free motion toward or away from a valve seat along a trajectory, the valve member having a closed position wherein the valve member is sealed against the valve seat and the fluid path is blocked by the valve member and an open position wherein the fluid path is not blocked by the valve member, the valve member movable toward the closed position along the trajectory by increasing a fluid pressure within the chamber;d) an annular filter in the fluid path, the filter located in an annular chamber surrounding the valve seat structure; rein, the valve seat is on a valve seat structure comprising an annular seating surface surrounding a central aperture, the fluid path extends through the aperture and, when the value member is in an intermediate position between its open and closed positions, the fluid path extends through a first constriction zone between the body and a surface on the valve member which is oriented substantially parallel to the trajectory and through a stagnation zone between the body and a surface on the value member which extends substantially transversely to the trajectory.