Threaded Ball Valves Pressure

1. Common Pressure Ratings for Threaded Ball Valves

• PN16 / 200 WOG (≈1.6 MPa)
  → For domestic water supply, HVAC, and light-duty applications.

• PN25 / 400 WOG (≈2.5 MPa)
  → Suitable for slightly higher-pressure water, oil, or gas pipelines.

• PN40 / 600 WOG (≈4.0 MPa)
  → Widely used in industrial medium-pressure systems.

• PN63 / 1000 WOG (≈6.3 MPa) and above
  → Designed for high-pressure service, such as hydraulic lines, compressed gas, or special process fluids.

(WOG = Water, Oil, Gas, indicating applicability for these media at the rated pressure.)

2. Selection Principles

1. Valve rating > Maximum system pressure × 1.25–1.5
   → Always keep a safety margin.

2. Consider temperature
   → At higher temperatures, material strength decreases; choose a higher class if necessary.

3. Check medium corrosiveness
   → For corrosive fluids, use stainless steel ball valves and consider higher ratings.

4. Account for connection strength
   → Threaded ends have limited strength. For continuous high-pressure duty, flanged or welded ball valves are safer choices.

3. Application Examples

• Domestic water line → PN16 is sufficient

• Compressed air (0.8 MPa) → PN25 or above

• Hydraulic system (3–4 MPa) → PN40 or higher recommended

• Chemical high-pressure line (>5 MPa) → PN63 or higher, preferably flanged/welded type