초록 ▼

Fluid flow control systems for lawn sprinkling flow control systems which include rain override means and continuously available rain alarm signals during rainfall. Provisions are provided to prevent valve flutter during light or intermittent rainfall by means of conventional time delay relays. A no

Fluid flow control systems for lawn sprinkling flow control systems which include rain override means and continuously available rain alarm signals during rainfall. Provisions are provided to prevent valve flutter during light or intermittent rainfall by means of conventional time delay relays. A novel, simple, and economic hermetically sealed outdoor casing is provided. Use of unique remote transformer plug and cord insures consumer product safety compliance against electrical shock hazzard.

대표청구항 ▼

A flow control for a fluid flow system having a fluid conduit with an electrically actuated flow control valve therein, comprising: a step-down transformer providing means for reducing a source of operating voltage to a source of low operating voltage; a first circuit means for connecting the said s

A flow control for a fluid flow system having a fluid conduit with an electrically actuated flow control valve therein, comprising: a step-down transformer providing means for reducing a source of operating voltage to a source of low operating voltage; a first circuit means for connecting the said source of low operating voltage to the valve actuator; a first switching means comprising timing means for automatically completing said first circuit means to energize the said valve actuator and thereby open the said valve and allow a flow of fluid through said conduit for a predetermined period of time, and upon completion of the said time period, said first switching means interrupts said first circuit means continuity causing said valve actuator to be de-energized, said valve to close, and terminate said fluid flow through said conduit; a second switching means comprising an electrically actuated, single pole, double contact, switch with a switch actuator, which when energized, causes a first contact to open and a second contact is closed, and when said switch actuator is de-energized, said first contact is closed and said second contact is opened; said first contact connected in series with said source of low operating voltage, said first switching means, and said valve actuator all in said first circuit means, and, upon energization of said switch actuator, causes said first contact to open, continuity of said first circuit means is interrupted, thereby, overriding said first switching mans, de-energizing said valve actuator, causing said valve to open, and terminating said fluid flow therethrough; said series connected circuit which, upon de-energization of said swich actuator, causes said first contact to close, restoriNg control of said first switching means, completing continuity of said first circuit means, energizing said valve actuator, causing said valve to open, and said fluid to flow therethrough; said second contact of said second switching means connected in series with a second circuit means and said source of low operating voltage, such that when said switch actuator is energized, the said second contact closes energizing the said second circuit means with the said source of low operating voltage, and when the said switch actuator is de-energized, said second contact opens removing the said source of low operating voltage from the said second circuit means; a third circuit means comprising said switch actuator, third circuit conductor means, and said source of low operating voltage all in series with a planimetric rain switch which, when closed, completes the continuity of said third circuit means, and when said rain switch is open, continuity of said third circuit means is interrupted; said planimetric rain switch comprising an insulated member having a surface which is adapted to be oriented to receive rain thereon, with first and second spaced apart conductor means disposed on said surface and connected to said third circuit conductor means which are adapted to be electrically connected by rain on said insulating surface, completing the continuity in said third circuit means, energizing said switch actuator, causing said first contact to open, overriding said first switching means, interrupting said first circuit means, de-energizing said valve actuator, closing said valve, terminating said fluid flow therethrough; and, upon cessation of said rain on said insulating surface, interrupting said third circuit means, de-energizing said switch actuator, causing said first contact to close, and restoring control of said valve actuator to said first switching means substantially conterminously with said rain cessation.