Irrigation system

Claim 2

In an irrigation system, an irrigation device, comprising: a. a tubular body member having a first end adapted for connection to a water supply line, a valve seat inwardly from the first end, a manifold chamber inwardly from the valve seat, a plurality of restricted outlets radiating from the manifold chamber, and an internally screwthreaded second end; b. a valve screwthreaded in the second end and having a valve head cooperating with the valve seat; c. the valve and body member define a flow resistance chamber between the valve seat and manifold chamber in which turbulent water flow occurs to reduce the water pressure in the manifold chamber for a given inlet pressure and valve setting; d. and a set of distributor tubes connected to the outlets.

Claim 3

An irrigating device as defined in claim 1, wherein: a. the distributor tubes are of small diameter to create a resistance to flow tending to create a back pressure in the manifold chamber and are of essentially the same length, thereby tending to cause essentially the same rate of low volume water discharge at low discharge pressure.

Claim 4

An irrigating device as defined in claim 1, wherein: a. the extremities of the distributor tubes are connectable to tubes of larger diameter to extend the points of discharge with minimal increased flow resistance whereby discharge rates from distributor tubes so connected remain essentially the same as from distributor tubes not so connected.

Claim 5

An irrigating device as defined in claim 1, wherein: a. pairs of distributor tubes are mutually connectable to provide a closed loop thereby to close off discharge therefrom and reduce the total water output from a selected irrigation device.

Claim 6

In an irrigation system, an irrigation device, comprising: a. tubular body member having a first end adapted for connection to a water supply line, a valve seat inwardly from the first end, a toroidal chamber surrounding the valve seat, a manifold chamber inwardly from the toroidal chamber, a plurality of restricted outlets radiating from the manifold chamber, and an internally screwthreaded second end; b. a valve screwthreaded in the second end and having a valve head cooperating with the valve seat including a curved peripheral portion complementing the toroidal chamber to cause toroidal water movement within the toroidal chamber the valve head forming with the manifold chamber a restricted outlet from the toroidal chamber whereby the toroidal water movement and flow past the valve head tends to produce reduced pressure and rate of flow in the manifold chamber for a given inlet pressure and valve setting; c. and a setting of distributor tubes connected to the outlets.

Claim 7

In an irrigation system, an irrigation device, comprising: a. tubular body member having a first end adapted for connection to a water supply line, a valve seat inwardly from the first end, a toroidal chamber surrounding the valve seat, a manifold chamber inwardly from the toroidal chamber, a plurality of restricted outlets radiating from the manifold chamber, and an internally screwthreaded second end; b. a valve screwthreaded in the second end and having a valve head cooperating with the valve seat including a curved peripheral portion complementing the toroidal chamber to cause toroidal water movement within the toroidal chamber the valve head forming with the manifold chamber a restricted outlet from the toroidal chamber whereby the toroidal water movement and flow past the valve head tends to produce reduced pressure and rate of flow in the manifold chamber for a given inlet pressure and valve setting; c. and a setting of distributor tubes connected to the outlets.

Claim 8

An irrigation device as defined in claim 5, wherein: a. the valve head and confronting wall of the manifold chamber are essentially frusto-conical and in parallel relation.