Refrigerant control valves

摘要

A refrigerant valve has a body with a through bore. Multiple tubes have openings aligned in a ring around a middle of the bore. The tubes lead to larger channels in the body. A needle assembly inserted through an end of the bore reciprocates a needle with a stepper motor and speed reducer to precisely control sizes of the openings. Further advancing the needle shaft after closing the openings to the tubes, engages and slides a bypass sleeve against a return spring force to open a bypass in a side of the valve body. A connector connects the bypass in a first end of the bore to outward opening holes of the channels.

主权项

1. Apparatus comprising
a refrigerant control valve having a valve body, a bore in the valve body, the bore having a first end portion, a medial portion and a second end portion, the first end portion of the bore comprising a first cylinder with a first diameter, the second end portion of the bore compressing a second cylinder with a second diameter larger than the first diameter, the medial portion of the bore comprising a valve seat having a frustoconical shape connecting the first and second cylinder, plural channels extending through the valve body, the channels having first and second ends, plural elongated lateral openings adjacent the valve seat in the medial portion of the bore, the first ends of the channels severally connected to the lateral openings in the medial portion of the bore, a needle assembly mounted in the second end of the through bore, the needle assembly having a conical portion and a cylindrical portion, the conical portion having a shape and slope similar and complementary to the frustoconical shape of the valve seat, a longitudinal needle motion controller connected to the needle assembly, and disposed with the needle assembly to move the needle in the bore and to move an end of the needle in the bore to selectively open and close the lateral openings concurrently with opening and closing the needle seat and to control fluid flowing through the first end portion of the bore and through the plural lateral openings and the plural channels.