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US 2011/0254234 A1Published application
Gland Seals
AssigneeZhejiang China Valve Co., Ltd.
InventorChangxiang Xu
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AssigneeZhejiang China Valve Co., Ltd.
InventorChangxiang Xu
Estimating the term…
A gland seal designed according to the joint's factors m and y and the seal-designing rule refined from ASME Code to result in its minimum necessary seating stress y at no fluid pressure being so small to be ignorable that its sealing maintenance factor or disturbance resistance index m, equal to the joint's sealing actuation force divided by the joint's unseating actuation force, can be used to indicate its sealing safety at a fluid pressure: when m=1, its sealing actuation force equals its unseating actuation force or equals its “seating area×fluid pressure” and so it can be kept leak-free under no upset disturbance condition and may leak at an upset moment, and when m>1, it can be resistant to an upset disturbance and be the greater, the more resistant. The factor m for a self-energizing tight joint is equal to its fluid's sealing actuation area divided by its fluid's unseating actuation area.
A curve leak type of pressure-tight gland seals comprising a square section of annular grooves and a square section of annular gaskets crammed tight therein, wherein the leaking path of the gland seal is of a curve in section, and the sealing maintenance factor m of the gland seal has a value of more than one, where m is the ratio of the fastener's actuation force capable of resulting in a sealing stress on the seating surface of the gasket to the unseating actuation force of leaking fluid on the seating surface of the gasket.
A curve leak type of self-energizing gland seals comprising a square section of annular grooves and an O-shaped or non-O-shaped section of annular gaskets not crammed to the pressurized wall of the groove, wherein the leaking path of the gland seal is of a curve in section, and the sealing maintenance factor m of the gland seal has a value of more than one, where m is the ratio of the self-energizing actuation force of the gasket to the unseating actuation force of leaking fluid on the seating surface of the gasket.
A straight leak type of pressure-tight gland seals comprising a rectangular section of annular grooves and a rectangular section of annular gaskets crammed tight therein, wherein the leaking path of the gland seal is straight in section, and the sealing maintenance factor m of the gland seal has a value of more than one, where m is the ratio of the fastener's actuation force capable of resulting in a sealing stress on the seating surface of the gasket to the unseating actuation force of leaking fluid on the seating surface of the gasket.
A straight leak type of self-energizing gland seals comprising a rectangular section of annular grooves and a rectangular section of annular gaskets not crammed to the pressurized wall of the groove, wherein the leaking path of the gland seal is straight in section, and the sealing maintenance factor m of the gland seal has a value of more than one, where m is the ratio of the self-energizing actuation force of the gasket to the unseating actuation force of leaking fluid on the seating surface of the gasket.
A straight leak type of self-energizing gland seals comprising a rectangular section of annular grooves and an O-shaped section of annular gaskets (called an O-ring) not crammed to the pressurized wall of the groove, wherein the leaking path of the gland seal is straight in section, but the design for face seal applications (where the gasket's end face is the seating surface) shall satisfy the inequality:
Dependencies are inferred from the claim text.