Bellows seal valve
AssigneeHoke Incorporated
InventorMaurice J. Webb
Life of this patent
Estimating the term…
Abstract
An improved bellows valve is disclosed having a relatively long bellows attached at one end to the valve control stem and at its other end to a recessed bellows mounting in the valve bonnet. The recessed attachment permits the use of a relatively long bellows with a valve bonnet of minimal size and mass and permits a wide valve opening with a relatively small valve port. Such a small valve port requires a low closing force for the stem and the use of a wide opening resists clogging. An anti-torque member connected between the valve bonnet and the valve stem prevents stem rotation to isolate the bellows from undesirble rotation during the axial stem and bellows movement.
Claims1
In a bellows valve having:
- a valve body with a fluid cavity including a control port coupling an inlet port to an outlet port;
- a valve bonnet attached to said valve body at one end and having a control member mounting means at its opposite end;
- a stem receiving aperture in said bonnet;
- a valve stem mounted in said stem receiving aperture for axial movement towards and away from the control port;
- a gland coupled to said bonnet having a non-round aperture thereby engaging a complimentary portion of said stem;
- a port closing means positioned on one end of said stem and within said cavity;
- a control member attached to the opposite end of said stem and threadably coupled to said mounting means;
- the improvement comprising said stem receiving aperture having an enlarged portion at said one end of said bonnet forming a bellows receiving recess;
- an elongated metallic bellows;
- a ring attached at said one end of said stem;
- one end of said bellows extending into said recess;
- a hollow sleeve positioned within said recess and attached to the side walls of said recess;
- a radially inward extending flange on said sleeve;
- said one end of said bellows terminating in a generally circular cylindrical portion;
- said flange having a complimentary circular cylindrical portion welded to said cylindrical portion of said bellows;
- and
- the opposite end of said bellows welded to said ring.
Dependencies are inferred from the claim text.