EARTHQUAKE PROTECTION
S-TECH has over 40 years experience in the design, production and distribution of technical equipments for the gas distribution. S-TECH has developed a family of products intended to ensure the safety of civil and industrial users in the event of disastrous events, such as earthquakes, but also extraordinary events such as climatic ones that increasingly involve the destruction and interruption of public services.
SEISMIC RISK IN THE WORLD
The areas of high seismic risk are distributed all over the world. In Europe the countries with the highest seismic risk are: Greece, Turkey, Italy, Albania, Montenegro, Slovenia, Macedonia, Romania (Carpathians), Iceland, Belgium, Portugal (Lisbon), Spain (Andalusia and Pyrenees), France (Alps), Austria, Germany, Switzerland, Norway (coast).
THE SEISMIC VALVES SV
The seismic valves S-Tech are devices designed to automatically shut off the gas flow in earthquake situations under standard conditions according to ASCE25-16, PED, ATEX, ANSI Z21. 21-2005, CSA 6.5-2005, CR90 – 002. When the device is subject to seismic vibrations as indicated in the legislation, the device intervenes and interrupts the gas flow.
OPERATION
The seismic valves SV of S-TECH are devices designed to automatically close the gas flow in the event of earthquakes by detecting the seismic movements according to the conditions defined in the technical standard ASCE 25-16 for seismic valves design and according the European PED and ATEX directives.
The device consists of a manually reset shut-off valve with built-in mechanical sensor-actuator, the valve automatically operates by releasing the obturator if the built-in seismic actuator detects vibrations, equal to those indicated and tested according to the technical standard Asce 25-16, according to which the valve was designed, closing automatically the gas flow.
After the automatic closing intervention, the valve remains in the closed position until it is manually reset which will allow the passage of the gas flow again.
Before proceeding with the reset, the safety existing conditions of the gas system, before the valve closing, must be checked.
The SV seismic valve it is a completely mechanical device which does not need any electrical power supply.
The SV seismic valve can therefore be defined as an automatic drive gas interception device with manual reset and can be installed, depending on the project and the system conditions, in a vertical or horizontal position (during the purchase phase the installation position must be defined).
The seismic valve is designed for installation upstream of the gas system which develops inside both civil and industrial buildings. Sensing the seismic vibrations of the earthquake, it automatically interrupts the gas flow, making safe the gas system downstream of the valve.
TECHNICAL FEATURES
| Body size | 1/2″ – 3/4″ – 1″ – 11/4″ – 11/2″ – 2″ – 21/2″ – 3″ – 4″ – 6″ – 8″ – 10″ |
| Connections | Flanged – threaded – threaded NPT |
| Work position | Vertical & Horizontal (to be specified at order) |
| Working pressure range | 0-0,5 bar (0-7 PSI) / 0-4 bar (0-60 PSI) |
| Design pressure | 0,75 bar (10 PSI) / 6 bar (90 PSI) |
| Acceptable gases | Natural gas, town gas, lpg, nitrogen, air, any non-corrosive gas |
| Operating temperature | -23°C ÷ +66 °C (-10°F ÷ +150°F) |
| Design standards-Approvals | CE mark according PED+ATEX directives+ASCE 25-16 |
| Green gas solutions | Hydrogen ready (mix with Natural Gas and Hydrogen over 20% H2) Biogas ready (on request special version for biogas) |
certifications
