Decision inputs
- Target compression window
- Required compensation travel
- Temperature and media
- Bolt count and available space
- Regulatory and leakage acceptance criteria
APPLICATION SOLUTION
Valve Packing and Flange Live Loading
Use elastic travel to compensate preload changes in packing, gaskets and bolted joints.
ENGINEERING PROBLEM
A sealing system may lose required compression after thermal cycling, embedment, creep or vibration.
BOUNDARY
This page describes a decision pattern and does not promise size or performance for another operating condition.
Solution pattern
- Define the allowable sealing-load window
- Allocate spring load and travel per bolt
- Select material, surface condition and stack
- Verify preload by installed height or load measurement
Key risks
- Excess load may damage packing or gaskets
- High-temperature relaxation can reduce long-term retention
- Parallel friction and assembly variation can create bolt-to-bolt imbalance
Verification plan
- Material-media compatibility review
- Single-disc and stack load-deflection verification
- Installed-height and torque/load records
- Retest after thermal cycling or dwell
Source-backed correspondences
| Summary | Load | Travel | Source |
|---|---|---|---|
| 阀门填料与法兰活载荷通常需要定制堆叠；先按密封/活载荷目标预选补充规格族。 | 按活载荷目标与螺栓预紧余量确定 | 补偿填料松弛与热循环行程 | Source ↗ |
Evidence (library locators)
Every technical claim traces to a specific asset version and page; restricted sources show locator metadata only.
- 071 Solon Live Loading Design Audit 阀活载荷设计审核表 PDF p.1 · mechanism(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.7 · mechanism(internal source; excerpt not public)
- 051 2025 JMES Ma Disc Spring Stacks Friction Bellows pdf PDF p.3 · mechanism(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.1 · mechanism(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.1 · mechanism(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.1 · mechanism(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.2 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.2 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.2 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.3 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.3 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.4 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.4 · numeric(internal source; excerpt not public)
- NaftaGaz 2023 Belleville Spring Stop Assembly Valve Force Deformation PDF p.5 · numeric(internal source; excerpt not public)
Cases illustrate decisions and do not constitute a specification promise for any other operating condition.
ENGINEERING REVIEW