Safety Valve / Pressure Relief Valve, Cast Steel, Flanged, Automatic, Spring Loaded Structure, Steam/Gas/Oil, API 526 Standard

Product Description

Safety Valve Product Introduction & Technical Specifications

1. Product Introduction

2. Technical Specifications

• Nominal Diameter (DN): Standard inlet/outlet sizes, matched to pipeline diameters (e.g., DN25, DN50).
• Nominal Pressure (PN/Class): Maximum allowable working pressure at room temperature, which must be the system's maximum working pressure (e.g., PN16 = 1.6MPa).
• Set Pressure: The predetermined pressure at which the valve begins to open, typically 1.05~1.2 times the working pressure and the equipment design pressure.
• Relieving Pressure: The pressure when the valve is fully open, which shall not exceed 1.1 times the set pressure (national standard requirement).
• Reseating Pressure: The inlet static pressure after the valve closes, which shall be 90% of the set pressure to avoid frequent opening and closing.
• Blowdown: The difference between the set pressure and reseating pressure, ideally as small as possible (usually 10% of the set pressure).
• Capacity: The discharge volume per unit time, which must meet or exceed the system's maximum relief rate (calculated according to GB/T 12241/API 520).

3. Main Component Materials

• Carbon Steel (WCB): For neutral media at room/medium temperatures, temperature range -20 ~ 425, economical and versatile with high strength.
• Stainless Steel (304/316L): For weakly corrosive and clean media (water, food-grade fluids), temperature range -196 ~ 600, corrosion-resistant and rust-proof.
• Alloy Steel (Chrome-Molybdenum Steel): For high-temperature steam and high-temperature oil products, temperature 550, high-temperature resistant and creep-resistant.
• Special Alloys (Hastelloy C-276 / Monel): For highly corrosive media (high-concentration acid/alkali, sulfur-containing oil products), temperature 600, excellent corrosion resistance at a higher cost.

4. Product Features

• Automation: Automatically opens to relieve pressure when overpressured, requiring no manual intervention with timely response.
• Safety: Strictly controls pressure not to exceed the set value, preventing equipment explosion and damage.
• Versatility: Multiple classifications adapt to different working conditions (pressure, temperature, media), offering flexible selection.
• Reliability: Used after passing pressure tests, ensuring long-term stable operation.
• Easy Maintenance: Spring-loaded type features simple structure for convenient daily maintenance; pilot-operated type supports on-line debugging.