Product Overview
The Spirax Sarco MST21 is a precision-engineered thermostatic steam trap designed for reliable condensate discharge and steam containment in industrial process systems. Utilizing a balanced pressure thermostatic capsule, the MST21 responds to temperature differentials to discharge condensate, air, and non-condensable gases while preventing live steam loss. With a 1/2″ BSP threaded connection, this trap is a direct-fit replacement for OEM installations and is suitable for a wide range of low to medium pressure steam applications. Its compact, robust construction ensures long service life and minimal maintenance in demanding process environments.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Thermostatic Steam Trap (Process & Pneumatic Valve) |
| Model Designation | Spirax Sarco MST21 |
| Connection Size & Type | 1/2″ BSP (British Standard Pipe) Threaded |
| Operating Pressure | Standard Industrial Grade (Up to rated bar) |
| Operating Temperature | Thermostatic capsule rated for saturated steam service |
| Mounting & Connection | Standard ISO / Manufacturer Interface |
| Body Material | Corrosion-resistant industrial grade construction |
Engineering Features & Advantages
- Precision Performance: Balanced pressure thermostatic capsule ensures accurate temperature response for efficient condensate discharge and minimal steam loss.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with a robust body and internal components resistant to wear and corrosion.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards, including 1/2″ BSP connection for straightforward installation.
- Air and Gas Handling: Automatically discharges air and non-condensable gases during start-up and normal operation, improving heat transfer efficiency.
- Compact Design: Space-saving footprint suitable for tight piping configurations without compromising performance.
Typical Industrial Applications
Ideally suited for steam distribution and condensate management in process industries, including:
- Steam tracing and jacketed vessels in chemical and pharmaceutical plants
- Unit heaters, heat exchangers, and coils in HVAC and process heating systems
- Laundry, food processing, and sterilizing equipment requiring precise steam control
- General steam mains and drip legs in industrial steam systems
PRODUCT IMAGES
SPIRAX SARCO MST21 1/2″ BSP Thermostatic Steam Trap
âš¡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine SPIRAX SARCO MST21 1/2″ BSP Thermostatic Steam Trap. This UK-made 1/2″ BSP hydraulic component features a balanced pressure thermostatic capsule, delivering leak-free, reliable fluid control for heavy-duty industrial systems.