Valve Component Parameters (II)
Release Date:
2026-06-18
1> Wrench Space (JB/ZQ4005-2006)
2> Design requirements for bolted threaded holes:
1. Bolt insertion depth: H = (1–1.3) × M (M: nominal thread diameter)
2. Effective internal thread depth: H1 = H + (0.2–0.5) × M (M: nominal thread diameter)
3. Depth of the hole on the side: H2 = H1 + (2–4) × P (P: pitch)
4. Minimum bolt edge distance: e ≥ M (for confined spaces), e ≥ 1.2 × M (for standard applications)
3> Allowable Axial Load and Pre-tightening Torque for Bolts
Axial load formula: F ≤ [σ]A (see bolt load table)
Tightening torque formula: T = 10⁻³ × K[σe]AD = 10⁻³ × K[σe](πd²/4)D (K = 0.15 + P/(πD))
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