機械密封彈簧壓縮量測量直接用卡尺測是，先測量在自由狀態下的彈簧伸縮量，再測量機封安裝到位后的量，一減是壓縮量。
集裝式密封可以不用自己去定壓縮量，因為整個密封裝好時已定好了，非集裝式密封要根據不同的泵的類型來測量。
單彈簧機械密封的壓縮量為50%—70%，大概密封壓死后放開3—5mm，多彈簧(碟形簧)的壓縮量為90%左右，即機械密封壓死后放開1.5—2.5mm即可。同時還要考慮密封面的寬窄，彈簧的力度，工作時受力狀態。
調節彈簧壓縮量是為了滿足彈簧比壓，而不是為壓縮量而壓縮量，不管它是單彈簧還是多彈簧。通常，機泵機械密封的彈簧比壓大致控制在1.3—2.8kgf/cm2左右。佳取值多少要根據實際工況條件、摩擦副配對材質、補償環輔助密封圈結構型式和要與載貨系數K值相適應等等。
泵用機械密封檢修中的誤區：
(1)彈簧壓縮量越大密封效果越好。其實不然，彈簧壓縮量過大，可導致摩擦副急劇磨損，瞬間燒損；過度的壓縮使彈簧失去調節動環端面的能力，導致密封失效。
(2)動環密封圖越緊越好。其實動環密封圈過緊有害無益。一是加劇密封圈與軸套間的磨損，過早泄漏；二是增大了動環軸向調整、移動的阻力，在工況變化頻繁時無法適時進行調整；三是彈簧過度疲勞易損壞；四是使動環密封圈變形，影響密封效果。

中譯英：
Mechanical seal spring compression measurement directly with the caliper measurement is measured in free state, before the spring expansion, and then measuring machine seal mounted in place after the volume, decrease is the amount of compression.
Assembled seal can not own to set compression, because the entire seal installed has been made, a cartridge seal according to the different type of pump to measure.
Single spring mechanical seal compression amount is 50%-70%, probably after the opening sealing crushed 3-5mm, multi spring(spring dish)the amount of compression of about 90%, i.e. mechanical seal killed after the release of 1.5-2.5mm. While also considering the seal face width, the spring strength, work stress state.
Regulating the amount of compression springs to meet the spring pressure, but not for the amount of compression and compression amount, whether it is a single spring or spring. Usually, the pump mechanical seal spring pressure generally control in 1.3, about 2.8kgf/cm2. Best value number according to the actual working condition, friction pairs materials, compensation ring auxiliary seal ring structure and with the cargo coefficient K value is adapted and so on.
Pump mechanical seal repair error:
(1) the amount of spring compression of the seal effect is better. In fact, excessive compression spring, can lead to rapid wear of friction pairs, instantaneous burning; excessive compression spring failed to regulate the ability of actin ring face, causing the sealing failure.
(2) dynamic ring seal chart tightening the better. In fact, dynamic tight ring seals harmful. A sealing ring and the shaft sleeve is aggravate the wear, premature leakage; two is to increase the dynamic axial adjustment of the resistance movement, the frequent changes in working conditions can not be adjusted in good time; three spring fatigue is easy to damage; the four is to make dynamic ring seal deformation, the impact of sealing effect.
(圖/文http://m.dahuiwx.com/)