JOHNSON - mechanical seal
The design of the mechanical seal consists mainly of two parts: a movable part and a fixed part. The fixed part is usually a ring that is fixed in the pump housing. The movable part is mounted on the shaft and is pressed against the fixed part by means of a spring. Mechanical sealing is achieved using secondary seals (bellows, rubber rings) and a friction pair. When choosing a mechanical seal, it is important to choose the material of the secondary seals and friction pairs.
Johnson Mechanical Shaft Seal Materials
- Rubber material:
- NBR (nitrile butadiene rubber), temperature resistance -20 to +120 C
- EPDM (ethylene-propylene rubber), temperature resistance -30 to +170 C
- Viton (fluoroelastomer), temperature resistance -30 to +185 C
- PTFE (fluoroplast), temperature resistance -260 to +260C
- Friction pairs
- SUS – metal (stainless steel)
- CAR – graphite
- CER – ceramic
- SIC – silicon carbide
- TС – tungsten carbide
It is visually difficult to understand how these materials differ from each other (except for PTFE), so it is easier to choose a material based on the pumped medium and its temperature. Contact us, we will help you determine the material and choose the right mechanical seal for your Johnson pump.
R-BT-FN 
R-BT-AR 
R-M3N 
R-MG1 
R-2100