Pilot Operated Safety Valver
Product Range
Pilot Operated Safety Valve
The Flow-Tek FT-620 Series Pilot Operated Pressure Relief Valve is designed for reliable high-performance pressure protection in air, gas, vapor, liquid, and two-phase applications. Its robust, standardized construction ensures dependable operation in demanding process and power industry environments.
Applicable Standards
- Design Standards: Compliant with API 520, API 521, API 526, API 527, and ASME Section VIII
- End Connections: Flanged ends suitable for ANSI, DIN, BS, JIS, IS, etc
- Testing Standard: Performance and leakage testing as per API 527
All valve castings and forgings are manufactured to ASME/ASTM material standards. Material options include WCB, WC6, WCC, WC9, CF8, CF8M, CA15, Hastelloy-C, and NACE MR0175 compliant grades.
High-pressure valves are equipped with Inconel discs and SS347H nozzles, while standard valves feature SS316 discs and nozzles.
Technical Specification
| Nominal Diameter at Inlet | DN 25 - DN 200 | 1" - 8" |
| Orifice | 1 D 2 to 8 T+ 10 | 1 D 2 to 8 T+ 10 |
| Actual Orifice Diameter | d0 11 mm - 180 mm | 0.433 in - 7.087 in |
| Actual Orifice Area | A0 95 mm2 - 25,446.9 mm2 | 0,147 in2 - 39.443 in2 |
| Pressure | 2,5 bar - 256 bar | 36 psig - 3,705 psig |
| Temperature | (iaw DIN EN) -45 °C to 200 °C | -49°F to 392°F |
| Body Material | 1.0619, 1.4408 | SA 352 LCB, SA 216 WCB, SA 351 CF8M |
| Body Material | Valve Connection |
| Valve Connection | Flange in accordance with DIN EN 1092, ASME B 16.5 or JIS 2220 |
| Load Type | Medium Controlled |
Features
- Pilot Operated Safety Valve:
- Pilot-to-main valve piping is fully integrated within the cover, protecting it from external damage and preventing freezing
- Integrated backflow preventer included as a standard feature.
- Fast delivery time – approximately four weeks from the factory.
- Requires up to 20% less installation space than comparable competitor models.
- Higher discharge capacity compared to similar-sized valves, thanks to additional orifices.
- Supplementary Loading System:
- Enables operation at higher set pressures.
- Extremely fast response time – fully opens within a maximum of 0.1 seconds.
- Allows functional testing and valve adjustment while the system remains in operation.
- Tight closing performance with a pressure differential of up to –3%; opening operation is unaffected by back pressure.
Applications
- Oil & Gas production and processing facilities
- Chemical manufacturing units
- Petrochemical refineries and plants
- Power generation stations