Hybrid flow metering valve

Details Hybrid flow metering valve Hybrid flow metering valve

2006-01-03

2006-01-03

Bastianelli, John (Department: 3751)

Valves and valve actuation

With material guide or restrictor

Spiral guide or spiral restrictor

C137S556000

Reexamination Certificate

active

06981689

ABSTRACT:
Presented is a flow metering valve that can precisely and accurately regulate the volume of the fluid-flow through entire range of measured flows. The valve comprises tubular body and moving stem in it. One end portion designated as a leading has threadely engaged stem and body. Another portion designated as a regulating has body with the stem extended to fill the tubular space longitudinally separating inlet and outlet ports. At least one of the surfaces—the inner of the body or the outer of the stem—is threaded and have their threads truncated by tapering truncation from the crest to the root. The truncated thread forms channel having cross-section tapering from one port to the other. The axially moving stem gradually changes the cross-section of the channel providing variable flow communication between the two ports. The fluid flow changes proportionally to the cross-section of the formed channel. The valve provides very fine regulation of the flow within four orders of magnitude.

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