US 2003/0116743 A1 · Flow quantity control valve

Abstract

A flow quantity control valve includes second spring holder that is fixed within housing and holds one end of valve spring which is located on a side of valve disk. The second spring holder is a roughly cylindrical member made of a material with a lower thermal conductivity than that of the housing 1 made of cast iron; and is composed of roughly circular internal bottom, stay portion that is a body portion extending from the outer periphery of the internal bottom and surrounding the valve spring, a through hole formed in a center of the internal bottom and having a larger internal diameter than the external diameter of surrounding wall constituting another through hole of the housing and flange portion radially and outwardly extending from a upper part of the stay portion and having a roughly rectangular periphery portion.

Claims6

Dependent claims

A flow quantity control valve comprising:

a housing internally having at least first and second fluid passages;
a valve seat provided within the housing;
a valve disk provided engageably and disengageably with the valve seat;
a valve stem holding the valve disk;
a valve spring energizing the valve stem in a direction along which the valve disk engages with the valve seat;
a driving means moving the valve stem in a direction along which the valve disk disengages the valve seat against an energizing force of the valve spring;
a first spring holder fixed on the valve stem and holding one end of the valve spring;
and
a second spring holder fixed within the housing and holding the other end of the valve spring.

6 more elements

Dependencies are inferred from the claim text.

Flow quantity control valve

Life of this patent

Flow quantity control valve

Life of this patent

Abstract

Claims6