Specifications:
The direct-activated pressure relief valve is constructed entirely from stainless steel #316, making it suitable for use with water, steam, acid & alkaline fluids, or oil. It serves as a safety device for pipes, remaining normally closed until the pressure exceeds a set value, at which point it releases excess pressure. The valve automatically closes once the pressure returns to a safe level.

Pressure Adjusting Range:
- 1 to 5 kgf/cm²
- 4 to 10 kgf/cm²
- 8 to 13 kgf/cm²

Temperature and Pressure Specifications:
- Applied Temperature: -15 to 100°C, 100 to 180°C for steam
- Valve Body Testing Pressure: 35 kgf/cm²
- Maximum Applied Pressure: 25 kgf/cm²

Materials:
- Main Body, Upper Cover, Shaft, Seat, Spring Cover: Stainless Steel 316
- Pressure Gauge: Stainless Steel
- O-Ring, Sealing Spacer, Diaphragm, UH-Ring: NBR/Viton
- Washer: Brass
- Adjusting Stem, Bolt: Stainless Steel 304

Valve Dimensions and Flow Rates:
Thread End Valves:
- RLT15-S: 1/2", H: 85mm, L: 70mm, Weight: 0.8kg, CV: 24
- RLT20-S: 3/4", H: 105mm, L: 85mm, Weight: 0.9kg, CV: 4.0
- RLT25-S: 1", H: 105mm, L: 90mm, Weight: 1.0kg, CV: 6.5
- RLT40-S: 1.5", H: 130mm, L: 115mm, Weight: 2.2kg, CV: 13.0
- RLT50-S: 2", H: 130mm, L: 120mm, Weight: 3.1kg, CV: 17.0

Flange End Valves:
- RLF15-S: 1/2", H: 85mm, L: 150mm, Weight: 2.0kg, CV: 24
- RLF20-S: 3/4", H: 105mm, L: 150mm, Weight: 2.8kg, CV: 4.0
- RLF25-S: 1", H: 105mm, L: 150mm, Weight: 3.5kg, CV: 6.5
- RLF40-S: 1.5", H: 130mm, L: 190mm, Weight: 5.9kg, CV: 13.0
- RLF50-S: 2", H: 130mm, L: 190mm, Weight: 6.5kg, CV: 17.0
- RLF65-S: 2.5", H: 185mm, L: 210mm, Weight: 11.5kg, CV: 30.0
- RLF80-S: 3", H: 185mm, L: 225mm, Weight: 12.0kg, CV: 42.0
- RLF100-S: 4", H: 230mm, L: 250mm, Weight: 19.0kg, CV: 75.0
- RLF150-S: 6", H: 290mm, L: 310mm, Weight: 45.0kg, CV: 170.0