The ST Mechanical Seal is a robust and high-performance sealing solution engineered for Armstrong pump systems, widely used in HVAC, building services, and industrial water circulation applications. Designed for continuous-duty operation, it delivers reliable, leak-free performance under varying temperature and pressure conditions.
This model features a precision-engineered structure supported by detailed dimensional standards, ensuring accurate fit and compatibility with multiple Armstrong pump configurations. Its advanced material combination—including carbon, silicon carbide, and stainless steel—provides excellent resistance to wear, thermal stress, and chemical exposure.
With flexible elastomer options such as NBR and VITON, the ST adapts to different operating environments. Its durable construction and optimized design minimize maintenance needs, extend service life, and ensure consistent performance in demanding HVAC and utility systems.
- Designed for Armstrong pump systems
- Suitable for HVAC & water circulation applications
- Precision-engineered dimensions for accurate fitting
- Advanced materials (Carbon / SIC / SS304/316)
- Secondary seal options (NBR / VITON)
- High resistance to temperature, pressure, and wear
- Long service life with low maintenance
| Seal size(inches) | D | D3 | D7 | L1 | L2 | L3 |
| 1 1/8" | 28.575 | 47.6 | 59.4 | 25.6 | 15.9 | 25.3 |
| 1 5/8" | 41.275 | 62.0 | 71.8 | 29.5 | 15.9 | 25.3 |
| 2 1/8" | 53.975 | 79.4 | 84.6 | 29.3 | 15.9 | 25.3 |
| 2 5/8" | 66.675 | 88.9 | 111.0 | 41.3 | 15.9 | 25.3 |
- HVAC systems (heating, cooling, circulation)
- Building water systems
- Industrial water circulation
- Chillers and boilers
- Utility and facility management
- Commercial and residential buildings