Definition

• A mechanical seal is a device designed to help join mechanisms or systems together by containing pressure or preventing leakage. Mechanical seals can be used for pressure systems ranging from pump seals to plugs to rubber bungs for wine bottle stoppers.
  
  

Function

• Mechanical seals can take on many forms. An end-face mechanical seal is often used for rotating equipment, like compressors and pumps. End-face mechanical seals contain both rigid and flexible elements, which are designed to maintain contact at a sealing interface or connection point. The elements slide over each other, allowing a rotating part to pass through the seal. The seal elements are spring loaded to help maintain contact. A plug, which is another type of mechanical seal, is typically composed of spongy material, like rubber, which naturally applies pressure to the interior of a hole when inserted and maintains a seal.
  
  

Fun Fact

• The mechanical seal was originally called the "cook seal," named after its inventor, George Cook.