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High-pressure boiler valve sealing test

Diameter. m; P - thread lead angle. Degree; P - equivalent friction angle, degrees; - bar ends (bottom) and the workpiece friction angle, degrees; y - bar end friction with the busy movement of the equivalent radius of the workpiece. m. P-D body. . D - diameter of the valve seat. m; P. - Hydrostatic test pressure. kPa. Transposition after that, Q ≤ F A corpse. No. 5 Lien Xiang et al: boiler valve sealing test pressure of 63 Figure 1 (a) sectional view (b) beams overlooking Figure 1. Pressure stick in 2. From the mechanics of beams is the remaining preload. To make watertight seal gland. That is greater than the remaining preload hydrostatic test pressure. Formula based on experience. Should be. 0 a (1.5 ~ 1. Cool

P. In order to ensure the seal inspection requirements. That F ≥ 2.5, J. Gland only meet the requirements. Here. Force F calculated values such as omitted. F rubber power because of its structure and values can not be other reasons too. 4 0 Figure 3 by trying to cut-off valve, safety check valve for high temperature, high pressure valves. If the pressure of playing with the seal test pressure,[link widoczny dla zalogowanych], neither safe nor necessary. Actually prince Yu 2 (a) sectional view (b) Top view 3 beams. Pressure lamp 4. Rubber bonding tool with the \suppressed, the defect will increase erosion by water pressure. Under the pressure of practical experience to hit the 1 ~ 3MPa. According to material mechanics theory. beam at the maximum force in the middle part (see Figure 4). According check bending strength theory strength. One of the biggest moment of change: M ... A, W A h2 (b ~ dt). where F - bar pressure, kN; ? - beams length,[link widoczny dla zalogowanych], m; h - beam height, m; b - horizontal beam width. m; d - beam diameter in the thread asked. m. because of the slender strut (see Figure 5), one end fixed, one end of the hinge, according to bar rigid mechanical problem does not exist ( In this omitted). by mechanical formula. its stability for the library v 64 Power System Engineering 5, 1997,[link widoczny dla zalogowanych], Volume 13 bar stabilization force analysis prince Yu prince Yu (with one end fixed. one end of the hinge) where E - modulus of elasticity; but one by one crushing strength. A. where - bar length factor, this take a 2; - bar length. m; i - inertial radius of the smallest cross-section bar.. n I.1 Plant 'll: = population of a 6.PliliA. where A - bar cross-sectional area; =. D - bar diameter. cm; = sue health> w. where P - bar maximum pressure. that F; ttttttttttttt : Welcome l ,-.-- bar safety factor, take a w-3 to 5. In this. The specific calculation omitted. 5 Conclusions and practical applications that has been calculated. bar with trapezoidal thread (commonly used Tr36 × 6 ~ Tr48 × 6) to meet the needs of the pressing force,[link widoczny dla zalogowanych], but also to meet the stiffness and stability requirements. The beams highly value ≥ 2D (D for the bar at the thread diameter), width (6 a d) ≥ 24mm or bending strength to meet the requirements. use of \Hydraulic test pressure value 1 ~ 3MPa is safe and easy to check. After more than a year in nominal diameter DN50 ~ DN250 valve seal leakage inspection practice, confirmed that \Safe and reliable. Check intuitive. High accuracy. References 1 Xu Hongwen Mechanics of Materials,[link widoczny dla zalogowanych], eds. Xu Zhenyu Du i9822 Higher Education Press Higher Education Press and other mechanical parts. 19813 compiled by Shanghai Diesel Engine Factory technology, light barrier is a design manual cutting machine tools. Beijing; Machine Press Mu. 1982; Di the editor. Machine Design Handbook by Beijing; Machine Press Gui. I988SealingTestofHPStopValve $ inBoilerLiEnxiangetal-Abstract: Theinfluenceofsea, rigtestforHPstopva [vesoFiprodUCtquM [tyandthecauseofUn-satifactorysealingtestwerediscussed. Theprincipleofanew'PressFromTop'methodwasdescribed. itssafetywasverifiedby. methanes. Keywords: 9ealtes; 'pressfromtop'method Editor: Wen Chang ttttIttttttt Contributors:,
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