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Bellows Sealed Stop Valves
- Ultimate solution to on/ off stop valve needs.
- Environmentally sound solution.
- Bellows sealed design ensures stem seal leaks are totally eliminated.
- Meets most stringent worldwide emissions legislation.
- Vital to maintain plant safety.
- Save energy, promote a cleaner environment.
- Zero emissions are guaranteed.
Not all products are available in all markets. Please choose your National Spirax Sarco Website or Contact Us for further information.
What do I do now?
Find further information on Bellows Sealed Stop Valves in the sections below, or get in touch for further assistance.
Contact us for advice from our engineers
- Help on sizing and selection
- Arrange a visit
- Answers & advice on products/applications
- Obtaining quotes & placing orders
Standard BSAT Range Table
(Complete with throttling plug and locking device)| Model and connections | BSA1T | ||
| Sizes | PN16 | KS10 | |
| DN15 | |||
| DN20 | |||
| DN25 | |||
| DN32 | |||
| DN40 | |||
| DN50 | |||
| DN65 | |||
| DN80 | |||
| DN100 | |||
| DN125 | |||
| DN150 | |||
| DN200 | |||
| DN250 | |||
| Optional R-PTFE soft seat | DN15 | ||
| DN20 | |||
| DN25 | |||
| DN32 | |||
| DN40 | |||
| DN50 | |||
| DN65 | |||
| DN80 | |||
| DN100 | |||
| Technical Literature | Literature for these products is available below | ||
Alternative BSA Range Table
(Complete with flat disc option)| Model and connections | BSA1 | ||
| Sizes | PN16 | KS10 | |
| DN125 | |||
| DN150 | |||
| DN200 | |||
| DN250 | |||
| Optional R-PTFE soft seat | DN125 | ||
| DN150 | |||
| DN200 | |||
| DN250 | |||
| Technical Literature | Literature for these products is available below | ||
Technical Information
Use our technical information sheets for a full technical specification of the product. They typically include:
- Pressure/temperature limits
- Materials
- Sizes & connections
- Dimensions & weights
- Capacity charts
- Ordering information
| Title | Reference Number | Issue | File Size | |
|---|---|---|---|---|
| A3S and A3SS Bellows Sealed Stop Valves | TI-P132-09 | 6 | 163 KB | |
| BSAT and BSA Bellows Sealed Stop Valves | TI-P137-18 | 5 | 550 KB | |
| SafeBloc Double Block and Bleed Bellows Sealed Stop Valve | TI-P184-08 | 5 | 476 KB |
Installation & Maintenance Instructions
Clear & accurate guidelines on installation & maintenance. They typically include:
- General safety information
- General product information
- Installation
- Commissioning
- Operation
- Maintenance
- Spare parts
| Title | Reference Number | Issue | File Size | |
|---|---|---|---|---|
| A3S Bellows Sealed Stop Valve | IM-P132-11 | 3 | 122 KB | |
| BSA and BSAT Bellows Sealed Stop Valves | IM-P137-02 | 8 | 492 KB | |
| BSA6T and BSA64T Stainless Steel Bellows Sealed Stop Valves | IM-P184-03 | 3 | 274 KB | |
| SafeBloc Double Block and Bleed Bellows Sealed Stop Valve | IM-P184-09 | 3 | 1.06 MB |
Steam Engineering Tutorials
Tutorials explaining the principles of steam and heat transfer, specific to this product section.
Calculators
The appropriate calculator to help designers and engineers select and size the products they need.
CAD Drawings
CAD drawings enabling you to see exactly how the product is constructed. You can also drop these into your own schematics.
Contact us for advice from our engineers
- Help on sizing and selection
- Arrange a visit
- Answers & advice on products/applications
- Obtaining quotes & placing orders


