Series 21
Teflon Bellow Seal
Type : 21C & 21R
SERIES 21C and 21R are designed for extremely corrosive chemicals, including concentrated acids and salts, strong oxidising and reducing agents, and chemically active organic compounds. All components which come in contact with the liquid being sealed are made of chemically inert material. Metallic components clamping ring and springs are located outside the pump stuffing box.
Type : 21C
In this seal type Glass filled PTFE face is composite moulded with highly flexible PTFE bellows.
Type : 21R
It is a seal similar to Type 21C in design with replaceable seal ring. This permits easy removal and replacements of the seal ring, a cost saving feature. In this type different face materials can be used to handle a wide range of corrosive and abrasive liquids.
Applications
- For Highly Corrosive clear/abrasive liquids
- From low to medium pressure
- MOC For Seal Faces:
- Rotary :- Glass Filled Teflon / Silicon Carbide / Carbon
- Stationary: Silicon Carbide / Ceramic.
Design
- All Contact Parts are Non-Metallic.
- Externally Mounted Design.
- Multiple Spring Arrangement for Uniform Loading.
- Independent of direction & Rotation.
Hardware Material
- Compression Unit:- Glass Filled Teflon
- Spring:- S.S.316/Hast Alloy 'C'
- Thrust Ring :- S.S.316
- Allen Bolt: 5.5.316
- Clamp - 5.5.316
- PTFE Bellow
Operation Parameters
- Pressure:- Vacumm to 5 Bar
- Speed: Upto 12 m/s
- Temperature:- 45°c to 120°c