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In the mechanical seal, when the rubber O-ring seal element is used, what common sealing failure problems will occur?However, the use of rubber sealing ring leads to overheating, usually due to the unfavorable conditions of excessive heat generated by the sealing surface of the centrifugal pump.The Dongsheng seal tells you that the PTFE seal is blue or black, the rubber ring is hardened and cracked, and the condition near the sealing surface will be more serious.
First, rubber sealing ring extrusion
When a part of the rubber O-ring is forced through a small gap, extrusion will occur.This extrusion occurs when the seal is assembled or assembled when the force is too large, or when the operating pressure and temperature are too high.When adjusting the shaft seal element, if the size exceeds the limit, a large gap between the components will also occur.The PTFE seal has a roll edge phenomenon, and the rubber sealing ring is peeled or torn.
Change Method: check the assembly method and operation conditions to ensure that all parts of the seal are adjusted to the original design requirements or re-adjusted by the manufacturer.
Two, rubber sealing ring (Overheating)
Overheating of rubber seals?Usually due to the adverse conditions of excessive heat generated by the sealing surface of the centrifugal pump.The PTFE sealing ring turns blue or black, the rubber ring is hardened and cracked, and the condition near the sealing surface will be more serious.
Change Method: check the circulation of the sealing cavity of the centrifugal pump (If the device should also be checked at the same time)See if there is any blockage.Follow-up check whether the pump has faults such as lower suction capacity, dry operation and slag formation, and check the product situation according to the original regulations.
3. wrong selection of rubber sealing ring
If the rubber O-ring is incorrectly selected, swelling and edge biting will occur. the consequences will not only make the seal itself lose its original performance and break, but also prevent the sliding parts from moving.
Change Method: check the working conditions of the original product of the shaft seal, check whether the sealing material is suitable, if it is not appropriate, re-select the sealing ring size and material.