Mechanical Seals

Since being established over 80 years ago John Crane has become the acknowledged global leader in seals. The earliest seal made by John Crane was the mechanical packing material. Still used today, in some situations, packing material is not adequate for sealing a pump shaft. One common alternative method for sealing the shaft is with mechanical seals. The mechanical seal was developed to overcome the disadvantages of compression packing (45-60drops/min leakage). While not leak-proof (5 drops/min), mechanical seal leakage can be reduced to a level meeting the environmental standards of local, state, and federal regulatory agencies; and maintenance costs are lowered ie pump shaft is not worn, power savings. Mechanical seals consist of two basic parts, a rotating element attached to the pump shaft and a stationary element attached to the pump casing. Each of these elements has a highly polished sealing surface. The polished faces of the rotating and stationary elements come into contact with each other to form a seal that prevents leakage along the shaft.

John Crane offers a comprehensive range of engineered mechanical seals and sealing support systems, mechanical packing, power transmission couplings and asset.