When installing an Emergency Shut-off valve it must be installed to shut off the flow from the tank towards the hose, enabling the valve to control product loss in case of a hose break. These valves are spring closed (aided by pressure) and shut off the flow in one direction only. Flow direction is indicated by an arrow on the body. The arrow.. Transfer Area Valves and Bulkheads emergency shutoff Valves Emergency Shutoff Valves (ESVs) were first mandated in the 1976 edition of NFPA 58. The following three features must be incorporated in an ESV (Ref. NFPA 58, §5.10.4) • Automatic shutoff through thermal actuation. The thermal element must melt at no more than 250°F (121°C).

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While it's possible to manually shut off your natural gas, the following specialized valves are available that can automatically shut off your service in case of an emergency:. Earthquake natural gas shut-off valve (also known as a seismic natural gas shut-off valve) automatically shuts off your natural gas service when an earthquake of a sufficient magnitude occurs at your home.. There are three types of gas shutoff devices. These are manual shutoff valves, earthquake sensitive automatic shutoff valves, and excess flow automatic gas shutoff valves. The DSA certification program deals with the latter two types of gas shutoff devices. The following comparison table is adopted (with modifications) from the SB 1992 (Perata.