Maximize Efficiency, Minimize Leakage with Danfoss SVA-S Series

In modern refrigeration and HVAC systems, tight sealing, durability, and stable operation of shut-off valves are critical to overall system performance. The Danfoss SVA-S 40 Shut-off Valve is engineered to meet these demanding requirements, providing a safe, precise, and reliable flow control solution under all operating conditions.

1. Overview of Danfoss SVA-S 40 Shut-off Valve

The Danfoss SVA-S 40 (Model: 148B5630) is a high-performance industrial shut-off valve designed for refrigeration and HVAC systems requiring tight sealing, durability, and reliable operation under extreme conditions.

2. Design and Working Principle

The valve is a globe-type shut-off valve consisting of:

• Housing: cold-resistant steel

• Spindle: polished stainless steel

• Valve cone: low-friction design

• Packing gland: PTFE sealing system

🔧  Working principle:
Rotating the handwheel moves the spindle linearly, allowing the cone to seal or open the flow path.

3. Key Design Features

• Low friction operation – cone rotates with spindle

• Perfect sealing – PTFE ring ensures tightness

• Anti-vibration design – prevents cone rotation

• Wide temperature tolerance – down to -60°C

4. Technical Specifications – SVA-S 40 (148B5630)

• Nominal size: DN40 (1 1/2 in.)

• Max working pressure: 52 bar (PS52)

• Temperature range: -60°C to +150°C

• Connections: DN40 inlet/outlet

• Materials:

  • Body: cold-resistant steel

  • Spindle: stainless steel (AISI 303)

  • Gasket: non-asbestos

  • O-ring: Neoprene

5. Performance

• Max opening/closing differential pressure: depends on flow direction

• Standard flow direction: P1 → P2

• Kv value: slightly reduced if installed in reverse

• Reliable sealing under pulsation and vibration

6. Installation Guidelines

• Install according to flow direction arrow (P1 → P2)

• Reverse installation is possible but reduces efficiency

• Avoid liquid traps in piping

• Prevent thermal expansion pressure buildup

7. Applications

• Industrial refrigeration systems (NH₃ / CO₂)

• HVAC systems

• Food processing plants

• Cold storage facilities

• High-pressure piping systems

8. Advantages

✔ High tightness and leak prevention
✔ Durable under extreme conditions
✔ Low maintenance
✔ Optimized for low-temperature operation
✔ Trusted Danfoss quality

9. Conclusion

The SVA-S 40 – 148B5630 is an ideal solution for high-demand systems requiring durability, safety, and long-term performance.