【2026 Emergency Shutoff】Are the emergency shut-off valves specified in TSG 92-2026 the same as those in the SIS?
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Definitions of the two: According to Appendix A of TSG 92-2026 \"Safety Technical Regulations for Safety Accessories of Pressure-bearing Special Equipment\", an emergency shut-off valve is defined as a valve that, in abnormal or emergency conditions, relies on sensors that detect changes in the medium’s concentration, or on changes in the medium’s pressure, flow rate, ambient temperature, or external forces acting on the connection points, to trigger the valve’s built-in shutting mechanism or components to act quickly, thereby enabling automatic closure of the valve; such a valve requires manual mechanical operation to be opened. Core feature: automatic shutdown, manual activation.
Under the frameworks of IEC 61508/IEC61511 and GB/T 50770-2013, an SIS emergency shut-off valve is defined as the final actuator in an SIS safety instrument system. It is driven by the SIS logic controller and operates to close quickly and securely in dangerous conditions such as overtemperature/overpressure/leakage/fire, in accordance with the requirements of the SIL level, thereby isolating hazardous materials and preventing the expansion of accidents； The default safe position in the event of a fault (normally closed/full open) is part of the fail-safe design. Key feature: SIS remote control for automatic shutdown. Are these two forms of \"automatic shutdown\" the same thing? If so, it means that the SIS emergency shut-off valve also falls under the category of safety accessories for special equipment. In the future, the manufacturing of SIS emergency shut-off valves will also need to comply with the regulatory requirements for emergency shut-off valves that are safety accessories for special equipment; a F230 manufacturing license must be obtained. If it is not the same thing, then it does not belong to the emergency shut-off valves that are safety accessories for special equipment. Emergency shut-off valves, which serve as actuating elements of SIS, are all manufactured under the licensing regulations applicable to piping components.
The emergency shut-off valves in TSG are considered safety accessories under the existing regulations on the safety of special equipment, but they specifically refer to self-acting emergency shut-off valves that serve to protect the equipment itself. Just like safety valves, safety valves, burst discs, and emergency relief valves in SIS all belong to the same functional category; however, safety valves and burst discs are considered safety accessories, while the emergency relief valves in SIS are not regarded as such. This is something that everyone understands and there are no disputes regarding it. Because safety valves and rupture discs are self-acting, unlike the emergency relief valves in SIS, which consist of sensing elements and an SIS controller, and thus have a complete SIF circuit along with SIL requirements. From this perspective, it can also be seen that the SIS emergency shut-off valve and the emergency shut-off valves in safety accessories are not the same thing; therefore, they are not identical.
A comprehensive comparison of emergency shut-off valves in TSG regulations and those in SIS systems.
Below is \"New Regulations on Safety Valves and Emergency Shutoff Valves to Take Effect on July 1, 2026 – An Interpretation of TSG 92-2026 ‘Safety Technical Regulations for Safety Accessories of Pressure-Serving Special Equipment’\", for reference.