The Sempell Model SOT is a high-pressure steam safety valve designed for boiler protection and steam system safety. It is of the disc-spring type and can be ordered with welding ends or flanged connections. The valve is engineered to relieve excess pressure safely before damage can occur, especially in high-temperature and high-pressure steam services.

Key Features

• Disc Spring Design — Uses disc springs rather than typical helical springs, enabling higher forces for a given size. This gives better performance in high set pressures and heavy service.

• Open Bonnet / Balanced Piston Construction — Ensures stable operation under varying pressure conditions.

• High Tightness up to Set Pressure — Due to supplementary load; helps prevent leakage until pressure reaches the set-point.

• Smooth Operation with No “Popping” Forces — The lift and actuation occur in a controlled manner, reducing pressure spikes.

• Mechanical Lift Stop — Ensures functional stability over repeated cycles, preventing over-stroke.

• Locking Feature for Hydrostatic Testing — Can be locked for hydrostatic test without additional parts.

• High Allowable Back Pressure — The design tolerates high system back pressure without compromising safety or operation.

Advantages

• High Performance in Severe Conditions — Designed for systems with very high pressures and temperatures; ideal for steam, superheated steam, etc.

• Reliable Operation & Tight Sealing — Good leakage tightness up to set pressure until activation, controlled lift, and robust mechanical stops.

• Durability & Material Versatility — Wide selection of materials allows matching to the specific steam chemistry, temperature, and environment.

• Lower Maintenance and Testing Ease — Features like lock-for-hydrostatic testing without extra parts, mechanical lift stops help in maintenance and reliable re-commissioning.

• Customizable — Various sizes, orifice diameters, body materials, connection types (flanged, welded), ability to include position indication etc.

Recommended Uses / Applications

• Boiler overpressure protection in power plants or steam generation systems.

• Systems needing high set pressure safety valves with minimal leakage and reliable operation at high temperature.

• Steam systems with strict requirements for tight sealing and durability under severe service.

By partnering with HKXYTECH, customers gain access to reliable Sempell Model SOT technology and a trusted supplier focused on minimizing downtime, improving safety, and ensuring long-term performance.