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The stem, which connects the actuator and disk, is responsible for positioning the disk. Stems are typically forged and connected to the disk by threaded or welded joints. For valve designs requiring stem packing or sealing to prevent leakage, a fine surface finish of the stem in the area of the seal is necessary. Typically, a stem is not considered a pressure boundary part. Connection of the disk to the stem can allow some rocking or rotation to ease the positioning of the disk on the seat. Alternately, the stem may be flexible enough to let the disk position itself against the seat. However, constant fluttering or. | Fundamentals of Robotic Mechanical Systems Theory Methods and Algorithms Second Edition Jorge Angeles Springer TLFeBOOK Mechanical Engineering Series Frederick F. Ling Series Editor Springer New York Berlin Heidelberg Hong Kong London Milan Paris Tokyo TLFeBOOK Mechanical Engineering Series J. Angeles Fundamentals of Robotic Mechanical Systems Theory Methods and Algorithms 2nd ed. P. Basu C. Kefa and L. Jestin Boilers and Burners Design and Theory J.M. Berthelot Composite Materials Mechanical Behavior and Structural Analysis I. J. Busch-Vishniac Electromechanical Sensors and Actuators J. Chakrabarty Applied Plasticity G. Chryssolouris Laser Machining Theory and Practice V. N. Constantinescu Laminar Viscous Flow G.A. Costello Theory of Wire Rope 2nd ed. K. Czolczynski Rotordynamics of Gas-Lubricated Journal Bearing Systems M.S. Darlow Balancing of High-Speed Machinery J.F. Doyle Nonlinear Analysis of Thin-Walled Structures Statics Dynamics and Stability J.F. Doyle Wave Propagation in Structures Spectral Analysis Using Fast Discrete Fourier Transforms 2nd ed. P.A. Engel Structural Analysis of Printed Circuit Board Systems A.C. Fischer-Cripps Introduction to Contact Mechanics A.C. Fischer-Cripps Nanoindentation J. García de Jalón and E. Bayo Kinematic and Dynamic Simulation of Multibody Systems The Real-Time Challenge W. K. Gawronski Dynamics and Control of Structures A Modal Approach K. C. Gupta Mechanics and Control of Robots J. Ida and J.P.A. Bastos Electromagnetics and Calculations of Fields M. Kaviany Principles of Convective Heat Transfer 2nd ed. M. Kaviany Principles of Heat Transfer in Porous Media 2nd ed. E.N. Kuznetsov Underconstrained Structural Systems continued after index .