US 4,071,038 AGranted

Failsafe fluid control valve

OwnerDale D. Robinsoninventor

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Abstract

A displaceable frusto-conical channel is provided typically axially in-line in a housing, the housing being interposed in a fluid supply pipe, e.g. a water supply line. The truncated smaller end of the channel is downstream in terms of fluid flow. A ball is disposed in the channel so that a surge or high flow of fluid will move the ball downstream within the hollow channel until the ball constricts and stops fluid flow by contact with the inner wall of the channel. To complete the device, the upstream end of the channel is spring-loaded and a rod acts against the downstream end of the channel, typically in conjunction with a timer. When the timer is set, the rod holds the channel away from the tapered internal surface of the housing, to permit continuous fluid flow. At a predetermined time, the rod is withdrawn and the spring moves the channel against the inner surface of the housing, so that fluid flow may be completely blocked by the ball if the flow becomes excessive, or in an alternative case, if any flow at all takes place. When the timer is reset, the ball moves, under the influence of gravity, away from the smaller downstream end of the channel and further fluid flow is permitted. When the device is applied in new home construction, i.e. where heat may not be constantly available and yet the house pipes may contain water, the rod may be provided with a freeze-out spacer so that if the heat fails, the system acts in the same manner as described above, i.e. the channel is moved by the spring and the water flow is blocked by the ball.

Claims9

Dependent claims

A failsafe fluid control valve comprising a hollow housing, a fluid inlet port at one end of said housing, a fluid outlet port at the other end of said housing, means to pass a fluid into said hollow housing through said inlet port, said housing having a central inner fluid flow control section, the inner surface of said central section converging in a downstream direction of fluid flow, a hollow channel, said channel being displaceably suspended within the central section of said housing, the outer surface of said channel converging in a downstream direction of fluid flow so that when said channel is displaced downstream, the outer surface of said channel mates with the inner surface of said central section to stop fluid flow, said hollow channel having an inner passage, said passage being inclined upwardly in a downstream direction, a substantially spherical ball, said ball being disposed in said passage, stop means at each end of said passage to prevent said ball from passing out of said passage, ball receiving means at the downstream end of said passage so that when said ball reaches said ball receiving means, fluid flow through said passage is terminated, the diameter of said ball being less than the height of said passage so that said ball may move freely upwards or downwards through said passage depending on differential pressure of fluid flow, a spring, said spring extending between said channel and the fluid inlet end of said housing, and a rod, said rod extending into the fluid outlet end of said housing to the downstream end of said channel, so that displacement of said rod moves said channel against the force of said spring.

Dependencies are inferred from the claim text.