Stem axial force synthesis and compressive/tensile stress check at undercut section for flat gate valves. Based on Valve Stem Force Synthesis standards.
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Separate close (Q'FZ) and open (Q''FZ) axial force calculations.
Packing friction force QT = psi * dF * bT * Pn included in force balance.
K1 (close) and K3 (open) coefficients for stroke-dependent forces.
Critical section at undercut groove with minimum cross-section area.
Both compressive (sigma_Y) and tensile (sigma_L) verified against [sigma].
Allowable stress [sigma] = 2/3 * sigma_s per standard practice.
Input pressure, stem/undercut diameter, packing and travel coefficients.
Q'FZ (close) and Q''FZ (open) from media, packing, and stem forces.
sigma_Y (compressive) and sigma_L (tensile) at undercut section.
Both must be <= allowable stress; pass/fail displayed.
Enter your design parameters and get instant verification results.
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