Valve Packings Seating Stress

Veiga, Jose ́ C.; Cipolatti, Carlos F.; ̃o, Carlos Gira; Ascenco, Leandro; Castro, F.C.

doi:10.1115/pvp2008-61214

Cited by 2 publications

(3 citation statements)

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“…Minimum seating stress is the pressure applied by the valve gland, σ 0 , to seat the packing so it fills all the voids between the stem and the stuffing box. These values were determined [10] experimentally using five rings with 6.4mm (1/4in) crosssection and the results are shown in Table 1. The minimum seating stress of each packing style is indicated on the following charts by a red vertical line.…”

Section: Test Results Torque X Axial Stressmentioning

confidence: 99%

“…The influence of the number of packing rings on sealability was also investigated. The minimum seating stress calculated on the previous paper [10] for five packing rings was now applied for two and seven rings. It was found that for the four packings studied, the leak rate was equal or less than 0.001mbar-l/sec of He under a pressure of 7bar (102psi).…”

Section: Sealabilitymentioning

confidence: 99%

“…Laboratory and subsequent field tests performed with different packing styles, valves and media showed that, as for gaskets, it is possible to have an installation seating stress procedures for packing valves [10]. However, these studies did not investigate the effect of the installation stress on the stem torque.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Different Braided Packing Materials and Number of Rings on Stem Torque and Sealability

Veiga

̃o

Cipolatti

2009

Volume 2: Computer Applications/Technology and Bolted Joints

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This paper introduces a test device and a protocol that simulates packing performance in different size valve stuffing boxes and stems. This test device enables measurement of braided packing compression, relaxation, axial force at the bottom of the stuffing box, the torque generated upon stem turning and the influence of the number of packing rings on stem torque. It also enables comparisons between different braiding yarns materials, impregnations and correlations with seating stress, stem torque and sealability. Test results showing these comparisons and correlations are reported.

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Section: Test Results Torque X Axial Stressmentioning

confidence: 99%

Section: Sealabilitymentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Different Braided Packing Materials and Number of Rings on Stem Torque and Sealability

Veiga

̃o

Cipolatti

2009

Volume 2: Computer Applications/Technology and Bolted Joints

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Stress Analysis of Packed Stuffing-Boxes

Kazeminia

Bouzid

2015

Journal of Pressure Vessel Technology

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Packed stuffing-boxes are mechanical sealing systems that are extensively used in pressurized equipment such as valves and pumps. Yet there is no standard design procedure in use to verify their mechanical integrity and leak tightness. It is only recently that standard test procedures to qualify packing materials have been suggested for adoption in both North America and Europe. Nonetheless the assessment of the structural integrity of the housing requires a well-documented design procedure to insure safe use of packed stuffing-boxes. While the packing contact stress with the side walls is predictable using existing models there is no analytical methodology to verify the stresses and strains in the stuffing-box housing. This paper presents an analytical model that analyzes the stresses and strains of the stuffing-box components including the packing rings. The developed model is validated both numerically using FEM (finite element method) and experimentally on an instrumented packed stuffing-box rig that is specially designed to measure the structural integrity and leakage tightness of different packing materials.

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Valve Packings Seating Stress

Cited by 2 publications

References 0 publications

The Influence of Different Braided Packing Materials and Number of Rings on Stem Torque and Sealability

The Influence of Different Braided Packing Materials and Number of Rings on Stem Torque and Sealability

Stress Analysis of Packed Stuffing-Boxes

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