Metering valve

An improved metering valve comprising:

• a valve body of a hollow tubular structure having an outlet of a relatively smaller diameter in a bottom side thereof and a valve hole having multiple threads in a top side thereof for receiving a retractable means inserted therethrough, said valve body having a longitudinally oriented milled surface at a lateral side thereof, said valve body is connected to a mounting plate disposed on the top side thereof, said mounting plate is in turn secured with a control means, a feed hole having multiple threads and a return hole having multiple threads being formed in said milled surface for receiving a feed duct means and a return duct means respectively;
• said retractable means, consisting of a cock of a size matching that of said valve hole and having a plurality of longitudinally oriented through holes circumferentially distributed on an upper side thereof for passage of a liquid, said cock having a lower end integrally connected to a neck portion and a disc plug of a size slightly larger than that of said outlet, said cock further having a centrally disposed threaded opening and a screw rod engaged within the opening, said screw rod is welded to a pivot which is fitted in a first notch formed in a lower end of a rod, a bolt being passed through said first notch and said pivot so that said pivot may turn, a spring being fitted around said rod which has a second notch passing through a hole of a cover so that said cover may be locked with said valve body;
• said control means being disposed on said mounting plate and having a connecting portion for fitting into said second notch of said rod to allow said retractable means to travel within said valve body,
• said feed duct means consisting of a plurality of tubular parts screwably connected to said feed hole of said valve body for passage of the liquid;
• and said return duct means consisting of a plurality of tubular parts screwably connected to said return hole of said valve body for passage of the liquid,
• said disc plug of said cock urging against said outlet by means of the action of said spring when said control means is inactive, so that the liquid from said valve body is discharged via said return duct means for recycling;
• said retractable means displaces upwardly when said control means is active, bringing said rod and said cock to simultaneously displace upwardly, with said cock sealing said return hole, so that the liquid flows via said feed duct means and said valve hole past said through holes of said cock and through said outlet until a determined amount is reached.