Modulate-Action
The modulate-action pilot-operated safety relief valve is a specialized device designed to protect pressure vessels and piping systems from overpressure conditions.
Explanation
The modulate-action pilot-operated safety relief valve is a specialized device designed to protect pressure vessels and piping systems from overpressure conditions.
Unlike conventional pilot-operated PRVs that fully open or close at set pressure points, modulate-action PRVs use a pilot mechanism to gradually adjust flow in response to system pressure changes. This allows them to maintain a stable set pressure and effectively manage pressure fluctuations.
For liquid service, modulate-action PRVs should be selected in accordance with API 520.
Standards Compliance
This type of safety valve meets all relevant requirements of:
- API 520 – Sizing and selection
- API 521 – Pressure-relieving and depressuring systems
- API 526 – Flanged steel pressure relief valves
- ISO 4126 – Safety valves
- GOST 31294 – Russian standard for pressure relief devices
Technical Information
| Article | CE (Metric) | ASME (SI) | ||
| Inlet Size Range | DN 25-DN 200 | 1″-8″ | ||
| Outlet Size Range | DN 50-DN 250 | 2″-10″ | ||
| Connection Std | EN 1092-1 | ASME B16.5 | ||
| Inlet flange rating | PN 16-PN 400 | CL 150-CL 2500 | ||
| Orifice Letter | 10 mm-160mm | D through T 0.39 through 6.3 inch |
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| Pressure range | 0.3 up to 350 Bar | 5 up to 5,110 psig | ||
| Temperature Range | -100 to 250 °C | -148 to 482 °F | ||
| Teknik Detaylar | ||||
| Carbon Steel | Heat Resistant Carbon Steel | Carbon Steel | SA 105, SA 216(WCB), SA 352(LCB) | |
| Heat Resistant Carbon Steel | 1,7357 | Heat Resistant Carbon Steel | SA 217(WC6) | |
| Stainless Steel | 1.4408, 1.4409 | Stainless Steel | SA 351(CF8M, CF3M) | |
| Spring Material | 1.4310, 1.4401, 1.4404, 1.4571, 1.7102 1.8159, EN 10270, 2.4669 |
302, 316, 316L, 316Ti, Inconel X-750 | ||
| Seat Types | Soft Seat, Hard Seat(Metal to Metal) | |||
| Seat Types | ||||
| Metal Sealing: Stellite 6 | ||||
| Soft Sealing: NBR, HNBR, Viton, Kalrez | ||||
| Test Gag | Applicable | |||
| Heating Jacket | Applicable | |||
| Manual Override | Applicable | |||
