Patent · US Expired

Two stage thermostatic valve device

US5690276A · kind A · utility

17Cited by

5References

21Claims

0Family size

Assignee

Caltherm Corporation · US

Inventors

Peter Thiel · Remscheid, DE
Don Hughes · Nocona, US
John F. Grote · Columbus, US

Key dates

Filing date	Oct 31, 1996
Grant date	Nov 25, 1997
Priority date	—
Expiry date	Oct 31, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86984
WIPO fieldControl
WIPO sectorInstruments

Abstract

A thermostat having a main valve and a secondary valve is disclosed both of which are biased closed by a single coiled compression spring and opened by a single piston. The entrance to the channel of the secondary valve is maintained at a maximum dimension of approximately 0.015 inches in order to keep undesirable particulate matter out of the valve. The surfaces within the valve channel encourage laminar flow which increases the volume of flow which can be passed through the valve while keeping the total surface area of the valve small.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.