US 6,981,689 B2
Hybrid flow metering valve
Gueorgui Milev Mihaylov, 1745 Lake Christopher Dr., Virginia Beach, Va. 23464 (US); and Evdokia Kirilova Mihaylov, 1745 Lake Christopher Dr., Virginia Beach, Va. 23464 (US)
Filed on Apr. 08, 2004, as Appl. No. 10/820,959.
Prior Publication US 2005/0224737 A1, Oct. 13, 2005
Int. Cl. F16K 47/00 (2006.01)
U.S. Cl. 251—126 10 Claims
OG exemplary drawing
 
1. A hybrid flow metering valve comprising:
a) a body having an inner tubular space along the main axis of the body thereof and having said tubular space divided to at least two substantially different portions—first one substantially threaded designated as leading portion and second one which can be internally threaded or smooth, designated as regulating portion; at least two interchangeable ports—one inlet port and one outlet port in fluid communication with said regulating portion of said tubular space and being separated longitudinally by internally threaded or smooth cylindrical surface;
b) a cylindrical stem having at least two substantially different portions longitudinally on its surface: first one—substantially threaded with the same pitch as said body and congruently engaged with said body threaded surface thereof designated as leading portion and second one which can be smooth or threaded, proliferating longitudinally into said second portion of the body between said inlet and outlet ports designated as regulating portion;
c) said leading portion of said stem having zero backlash fit with congruently engaged body leading portion thereof defining leading thread capable to move longitudinally said stem into said regulating body portion upon rotation of said stem and said regulating portion of the stem being threaded or smooth is engaged threadedly or slidably with corresponding said regulating portion of said tubular space;
d) at least one of the mutually engaged said regulating portions of said tubular space and said regulating portion of said stem is substantially threaded;
e) at least one of said substantially threaded surfaces has its thread substantially truncated with tapering truncation—for the internal thread, from the major diameter of internal thread to the diameter equal or lesser than minor diameter of internal thread and for the external thread, from the major diameter of external thread to diameter equal or lesser than minor diameter of external thread;
f) said mutually engaged regulating body portion and said regulating stem portion defining at least one spiral backlash or groove along said tapering truncated thread and said backlash or groove being with tapering cross-section;
g) said tapering cross-section defining tapering flow passage between said inlet and outlet ports and said cross-section of said tapering flow passage being a function of the length of said stem engaged between said two ports therefore function of rotation of said first part of said stem into said regulating portion of the body;
h) said stem having conical or ogival front part adjacent to said truncated threaded portion and said front part extended beyond said outlet port when said stem fills completely said space between said inlet and outlet ports and seals hermetically a sit with corresponding shape defined into said tubular space;
i) said stem having a means for rotation mounted on extended out of said body part of said stem, so that by rotation of said means, said stem will axially move into the space between said inlet and said outlet ports, whereby providing full range of flow regulation from “shut-off” position when said stem completely fills said space, then very “low flow” position along the backlash capillary channel when said stem is partially removed from said space, then “moderate flow” position when said stem is inserted only partially into said inlet port by said front portion and “full flow” position when said stem with said front portion is removed completely and said space is full with fluid.