T-systems International, Inc.

Reed Irrigation Systems

T-systems Corp.

Davies Allport

David Giuntoli

Melvin F Hinton

William F Holzer

In a high speed method and apparatus for forming inlet and/or outlet ports in drip irrigation hose, the surface of one margin of a continuous length of plastic film is deformed without puncturing at periodic intervals along its length corresponding to the locations of the inlet and/or outlet ports to form protrusions from the film surface. Thereafter, the protrusions are severed from the film to form the ports. The remainder of the hose is made in a conventional fashion. Preferably, the film surface is deformed by directing the film through the nip of pair of rotating wheels. On the surface of one of the wheels is a series of blunt projections sized, shaped and positioned to correspond to the ports being formed. The protrusions are severed by the edge of a knife across which the film is directed.

Method and apparatus for forming ports in drip irrigation hose

In a method for prohibiting the growth of roots in the outlets of a drip irrigation hose, water under pressure is supplied to the hose for drip irrigation of the soil. A soil retainable, water transportable substance such as clay is introduced into the hose upstream of the outlets to form in the vicinity of the outlets localized regions containing the substance. The soil-retaining substance is also capable of absorbing a selected root-inhibiting, water-transportable substance. The selected root-inhibiting substance is introduced into the hose upstream of the outlets to distribute such root-inhibiting substance to the localized regions for absorption by the soil-retainable substance.

Method for protecting drip irrigation hoses and other structures from

A combination flow control, shutoff and pressure relief device comprises a body with a movable spool and inlet and outlet portions. The spool supports a spring loaded valve head that forms an internal fluid chamber around one end when the handle fixed to the other end is in the closed position. An orifice in the body inlet portion is progressively opened from a complete shutoff position by rotation of the spool within the body to provide flow into the fluid chamber. When fluid pressure within the internal chamber exceeds a preselected spring force on the valve head, the latter opens to provide pressure relief. Regulation of the fluid pressure in the chamber and thus in the outlet can be maintained at the preselected level by controlling the size of the inlet orifice at a point just below the actuation level of the valve spring.

Growing community of inventors

La Jolla, CA, United States of America

Davies Allport