John Crane mechanical seal type 21

The John Crane mechanical seal type 21 is a popular and widely used mechanical seal design. It is a single, unbalanced seal that features a rotating face and stationary face, which are both made of carbon. The seal faces are held together by a set of springs, which provide the necessary force to maintain a seal between the rotating and stationary parts.The type 21 mechanical seal is commonly used in pumps and other rotating equipment, where it helps to prevent leaks and maintain the integrity of the system. It is known for its reliability, durability, and ease of installation.chesterton 442 mechanical seal,vulcan mechanical seals. Operational Conditions: Temperature: -20ºC to +120ºC  Pressure: ≤1.0MPa Speed: ≤15m/s  Materials: Stationary Ring: Ceramic (Alumina), Silicon Carbide Reaction Bonded, Silicon Carbide Sintered Pressureless, Ni-binder Tungsten Carbide Rotary Ring: Resin Impregnated Carbon Graphite (Furan), Antimony Impreg, Carbon Graphite, Silicon Carbide Si…