Applications For Bellows Seal Globe Valves

In addition, when the strain is balanced throughout the bellows, nearly any pressure may be utilized to the bellows with out injury or reduction in life. The present invention additionally retains some great benefits of the unique bellows seal of FIG. three in that its two bellows, whereas of differing diameters to attain pressure steadiness as in U.S. No. 2,880,620, are arranged finish-to-finish to get rid of the adjacent bellows convolutions of telescoping construction that must move in opposite instructions, and that induce bellows lock-up from particulates, nice silts and precipitates.

By utilizing a static secondary seal, damaging shaft or sleeve fretting and subsequent premature seal failure is averted. Unlike springs, bellows seals are non-clogging and the durable design can withstand larger viscosity fluids and a higher focus of solids. 3, a cross-sectional view of a standard gate valve 20 sealed with a shaped bellows meeting 22 is illustrated. A valve stem 36 having a gate 38 attached to 1 end thereof is acquired within the elongated tubular bonnet 30 and thru the shaped bellows meeting 22. The backside end forty of the bellows meeting 22 is attached to the valve stem 36 in a spaced-aside relationship with respect to the gate 38.

Laboratory testing at temperatures to seven hundred levels F demonstrates that the ultimate seal design displays each low leakage and low wear. A thick plate bellows development supplies high resistance to corrosion, fatigue, and stress stress. The Inconel 718 bellows was evaluated for resistance to shear and fatigue failure in dry operating tests utilizing silicon carbide vs silicon carbide faces. This resulted in heavy damage to the silicon carbide faces, however in every check the Inconel bellows had been intact and helium leak tight afterwards.

A cap member forty eight having a bore 50 and concentric counterbores 52 and 54 formed therein is receivable on flange forty six and is attached thereto by a plurality of bolts fifty six, typically located on a bolt circle. Packing material is provided within counterbore 52 forming a seal fifty eight and is maintained therein by a packing gland 60 having a bore sixty two therethrough. Valve stem 36 is obtained via bore 50 in cap member forty eight, the packing materials 58, and bore sixty two in packing gland 60.

Gate 38 of valve stem 36 is receivable in a seat 42 offered within valve physique 24 and interposed between inlet 26 and outlet 28 supplied in physique 24. The opposite end 44 of the elongated tubular bonnet 30 is shaped into a flange 46.

Valve stem 36 and gate 38 are proven in their retracted or valve open position and in their extended or valve closed position . When the gate valve 20 is in the open place, the shaped bellows assembly 22 is subjected to the strain of the fluid flowing by way of the valve 20. When fluid pressure is applied throughout the free plate wall of the shaped bellows meeting 22, the wall flexes in a balloon-like trend. This flexing introduces stresses within the shaped bellows meeting 22 which are concentrated close to the inner diameter and outer diameter of the bellows. Subsequent stretching or compression of the bellows creates extra stresses which are added to or subtracted from the stresses brought on by pressurization.

These combined stresses determine the number of flexures and/or strain cycles that the bellows will withstand. In valve purposes, the flexing of the bellows is crucial, and pressure is always concerned. If considered one of these sources of stress could possibly be eradicated, bellows cycle life could be tremendously improved. The current invention effectively eliminates the stress due to pressurization by causing the bellows to at all times be subjected to an equal and balancing pressure on both sides of the free plate or diaphragm. Without the stress attributable to strain, is possible to design a bellows having a very high and predictable cycle life.

An Inconel 718 metal bellows seal has been developed to meet the demands for high temperature functions in corrosive media corresponding to high Sulphur bearing crude oil. Finite component analysis was used to develop ideas having low seal face distortion at high temperatures and to attenuate bellows stress.

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