Float Valve (Patent No: 576906)

Inventor: Altool Ltd. (assignee)

Location: Edmonton

Comments: N/A

Description: 576,906. Issued June 2, 1959. Float Valve.

Walter Walls, Edmonton, Alberta, Canada, assignor to Altool Limited, Edmonton, Alberta, Canada. Application September 16, 1954, Serial No. 672,914.

4 Claims

1. A drilling string float valve comprising a hollow valve casing having an accurately cylindrical outer surface and a substantially cylindrical inner surface, a valve stem, a conical valve head secured to said valve stem, a valve seat secured in said casing for co-operation with said valve head, a conical valve stem guide, a plurality of webs extending radially inwardly of said casing to support said valve stem guide centrally thereof whereby to mount said valve stem to extend along the longitudinal axis of said casing, said valve head and valve stem guide forming between them an annular conical cavity, a conical valve spring adapted to be compressible into a substantially flat spiral, said valve spring being mounted beneath said valve head in said cavity, the outer conical surface of the valve head and the conical surface of the valve stem guide co-operating with one another in the open position of the valve to form a substantially uninterrupted streamlined surface of smoothly varying cross-sectional diameter in the longitudinal direction of the casing.

2. A drilling string float valve comprising a hollow valve casing having an accurately cylindrical outer surface and a substantially cylindrical inner surface, a valve stem, a conical valve head secured to said valve stem, a valve seat secured in said casing for co-operation with said valve head, a conical valve stem guide, a plurality of webs extending radially inwardly of said casing to support said valve stem guide centrally thereof whereby to mount said valve stem to extend along the longitudinal axis of said casing, said valve bead and valve stem guide forming between them an annular conical cavity, a conical valve spring adapted to be compressible into a substantially flat spiral, said valve spring being mounted beneath said valve head in said cavity, the outer conical surface of the valve head and the conical surface of the valve stem guide co-operating with one another in the open position of the valve to form a substantially uninterrupted streamlined surface of smoothly varying cross-sectional diameter in the longitudinal direction of the casing, and a plurality of elongated apertures in said casing adjacent the outer periphery of said valve bead.

3. A drilling string float valve comprising hollow valve casing having an accurately cylindrical outer surface and a substantially cylindrical inner surface, a valve stem, a conical valve head secured to said valve stem, a valve seat secured in said casing for co-operation with said valve head, a valve stem guide having a configuration substantially that of a truncated right circular cone superimposed coaxially upon the base of an inverted truncated right circular cone of similar base diameter but of greater height, a plurality of webs extending radially inwardly of said casing to support said valve stem guide centrally thereof whereby to mount said valve stem to extend along the longitudinal axis of said casing, said valve head and valve stem guide forming between them an annular conical cavity, a conical valve spring adapted to be compressible into a substantially flat spiral, said valve spring being mounted beneath said valve head in said cavity, the outer conical surface of the valve head and the outer conical surface of the valve stem guide co-operating with one another in the open position of the valve to form a substantially uninterrupted streamlined surface of smoothly varying cross-sectional diameter in the longitudinal direction of the casing.

4. A drilling string float valve as claimed in claim 3 wherein said casing is provided with a plurality of elongated apertures adjacent the outer periphery of said valve head.