US 6,318,400 B1 · Low interflow hydraulic shuttle valve

Abstract

The hydraulic shuttle valve has two coaxial supply ports and a transverse function port to direct fluid coming from alternative control sources to a blow out preventor (BOP). The valve includes a moveable shuttle with opposing tapered metal sealing surfaces to alternatively engage opposing coaxial metal valve seats. The shuttle moves back and forth into alternative sealing engagement depending on which supply port has the highest fluid pressure. As the shuttle moves from engagement with one metal seat to engagement with another, there is low or no interflow from one supply port to the other, thus maximizing the amount of fluid directed to the function port. An obtuse metal point is formed on each metal valve seat which comes into contact with a respective outward tapered sealing surface on the shuttle. Repeated movement of the shuttle to and fro displaces a portion of the metal point into a recessed chamfer. This displacement of metal insures a good metal to metal seal between the shuttle and the metal valve seat. This displacement of metal is also known as “progressive coining.” In alternative embodiments, the low interflow hydraulic shuttle valve with metal to metal seals can include three or more supply ports. In the alternative embodiments, a plurality of body sections each containing at least one supply port and a shuttle valve can be stacked one upon the other to achieve a multi-supply port configuration as required by the application. In the alternative embodiments, the metal to metal seals of the shuttle and the valve seats progressively coin to insure a good seal.

Claims8

Dependent claims

A low interflow hydraulic shuttle valve to direct fluid flow from two subsea control pods to a blow out preventer to actuate the preventer, comprising:

a body having a pair of opposing coaxial supply ports, and a transverse function port, the supply ports in fluid communication with the subsea control pods and the function port in fluid communication with the blow out preventer;
a first metal valve seat surrounding the first supply port and a second metal valve seat surrounding the second supply port, the valve seats being coaxially aligned on opposite sides of the body;
an elongate shuttle coaxial with the metal valve seats and the supply ports slidably moving from sealing engagement with the first valve seat to sealing engagement with the second valve seat in response to fluid flow from the subsea control pods;
said shuttle including a central flange with opposing sealing surfaces having opposing outward tapers to engage the valve seats, the shuttle further including opposing end portions, each with an axial bore and a plurality of perforations through the end portion to the bore;
and
each of the opposing outward tapers of the sealing surfaces on the central flange of the shuttle adapted to alternatively contact the metal valve seats to progressively coin the valve seats and ensure a metal to metal seal between the tapers and the valve seats;
and
a circumferential chamfer adjacent each metal valve seat to create an obtuse metal point that will contact sealing surface,
a displaced metal lip protruding from the chamfer, the lip being created by the progressive coining of the seat.

6 more elements

The reciprocating shuttle differential fluid flow restrictor of claim 9, wherein said pair of adapters comprises:

a first adapter member having a first central bore extending there through, said bore having a first entry port and a first exit port having a circumferential chamfer and the adapter is adapted to fixedly attach within an aperture opening to a fluid flow passageway of a fluid carrying structure where the fluid flowing through the passageway flows in said first entry port of said first central bore and out said first exit port,
a second adapter member having a second central bore extending there through and said second central bore having a second entry port and a second exit port having a circumferential chamfer and said second adapter is adapted to fixedly attach within a second aperture opening to the fluid flow passageway proximately spaced apart from said first adapter disposed such that said second exit port of said second adapter faces said exit port of said first adapter where fluid flowing through the passageway flows in the second entry port and out the second exit port to the fluid flow passageway;
and
wherein said shuttle member comprises,
an elongate shuttle member including a central circumferential flange with opposing sealing surfaces having opposing outward tapers and opposing end portions each insertable into one of the said first and second adapter bores and each of said end portion having an axial bore and a plurality of apertures extending through the end portion to the bore,
where said elongate shuttle is adapted to slidably reciprocate between the first and second adapter responsive to the direction of fluid flow and the opposing sealing surfaces alternatively form a metal to metal seal with a first and second metal valve seat at the first and second exit ports and fluid flows alternatively through the first and second exit ports through the axial bore of the opposing end structures and out the plurality of apertures to the fluid flow passageway.

3 more elements

Dependencies are inferred from the claim text.

Low interflow hydraulic shuttle valve

Life of this patent

Low interflow hydraulic shuttle valve

Life of this patent

Abstract

Claims8