ROSOV Automated Triple-offset Butterfly Valve (SIL-3 Capable)
Supreme Valves' Remote-Operated Shut-off Valve (ROSOV) Triple-offset Butterfly Valve Assembly is a high-reliability, fail-safe safety system designed for critical oil movement, storage tankages, and emergency shutdown (ESD) applications. Integrating a robust, fire-safe TOBV with heavy-duty pneumatic or electro-hydraulic actuators, smart solenoids, and positioners, this complete engineered assembly meets the rigorous safety requirements of IEC 61508 / 61511 standards, providing SIL-3 safety loops.
Key Applications
Industrial Applications & Engineering Problem Solving
The Engineering Challenge
Refinery tank farms and bulk storage terminals handle millions of gallons of flammable hydrocarbons. In an emergency tank overfill or fire, operators cannot manually reach critical isolation valves. Standard automated valves can seize when left static for years, failing to shut when an emergency strikes, leading to catastrophic explosions and environmental disasters.
The Supreme Valves Engineering Solution
Our ROSOV Automated Triple-offset Butterfly Valve Assembly integrates a fire-safe, torque-seated TOBV with a heavy-duty spring-return scotch yoke actuator. Equipped with redundant SIL-3 solenoids and smart digital positioners, it guarantees fail-safe shutdown in under 1 second. Built-in Partial Stroke Testing (PST) tests the assembly online without stopping flow, proving mechanical readiness and satisfying IEC 61508 SIL-3 safety loops.
Operational Use Cases & Scenarios
Tank Inlet/Outlet Emergency Isolation
Operational Challenge: Remote-operated fail-safe shut-off on bulk crude oil and fuel storage tank lines to prevent environmental spills and isolate fire zones.
Engineering Benefit: Scotch yoke spring-return actuator shuts the valve immediately on power/pneumatic loss, isolating fuel sources.
Emergency Shutdown (ESD) Systems
Operational Challenge: Ensuring a critical refinery feed line can be isolated instantly from a remote safety console during a process alarm.
Engineering Benefit: Independent SIL-2 safety loop certificate provides regulatory and safety compliance, protecting personnel and plant assets.
Technical Specifications
Material of Construction (MOC)
Dimensions & Weights
| NPS Size (DN) | Face-to-Face (mm) | Actuator Model | Height (H, mm) | Total Weight (kg) |
|---|---|---|---|---|
| 6" (DN150) | 140 | SY-10 | 850 | 220 |
| 8" (DN200) | 152 | SY-12 | 980 | 310 |
| 10" (DN250) | 165 | SY-14 | 1120 | 480 |
| 12" (DN300) | 178 | SY-16 | 1250 | 610 |
| 14" (DN350) | 190 | SY-18 | 1380 | 780 |
| 16" (DN400) | 216 | SY-20 | 1510 | 1120 |
| 24" (DN600) | 267 | SY-24 | 1890 | 2150 |
Purchase Options
Features & Benefits
Complete SIL-3 Capable Automation
Fully integrated safety loop combining a fire-safe TOBV, high-torque scotch yoke spring-return actuator, redundant SIL-3 solenoids, and a smart control cabinet, designed and reviewed by functional safety engineers.
Remote Emergency Shut-off (ROSOV)
Designed as a fail-safe system that instantly snaps shut in <1 second upon receiving an emergency signal from the ESD panel or upon loss of pneumatic supply.
Online Partial Stroke Testing (PST)
Smart positioner executes a 10% valve stroke automatically or remotely to confirm mechanical readiness, extending mandatory shut-down inspection intervals up to 5 years.
Fire-safe & Low-Emission Design
The valve has metal-to-metal sealing, graphite-gasketed covers, and low-emission packing meeting ISO 15848 and API 607, ensuring total safety during refinery fires.
Frequently Asked Questions
Q What is a ROSOV and why is it used in oil terminals?
ROSOV stands for Remote-Operated Shut-off Valve. It is a critical safety valve placed on the inlet/outlet lines of bulk storage tanks. In case of an overfill, pipe leak, or terminal fire, operators can trigger the valve remotely from a safe control room to isolate the tank, preventing major oil spills and disaster escalation.
Q How does Partial Stroke Testing (PST) work?
PST moves the valve disc by 10-15% during normal operations without interrupting process flow. This verifies that the valve and actuator are not seized, mechanical stiction is low, and the solenoid fires correctly, enhancing safety and satisfying insurance requirements.
Q Do you provide single-point warranty?
Yes. Supreme Valves supplies the entire ROSOV package—valve, actuator, solenoids, limit switches, and control panels—completely assembled, functional safety tested, and calibrated, with a single-point system warranty.