Technical Data
- The TDW ESV are currently available for service pipe diameter 20 mm; (DN15) and diameter 32mm (DN25) and compatible with service tees from all major European electrofusion-fitting manufacturers.
- The ESV is designed to operate in the open position with inlet pressure range of 1 to 4 bar (14.25 to 57 psi).
- The inlet flow range is 0 to 25 cubic meters (880 cu. ft/hr.) for the 20 mm and 0 to 100 cubic meters per hour (3530 cu. ft./hour) for the 32 mm. Line pressure drop at nominal flow is equal to 110 mbar (1.5 psi).
- When an excess flow condition occurs (i.e. >40 cubic meters/hour for the 20 mm or >160 cubic meters/hour for the 32 mm), most likely caused by a line cut, the ESV slams shut, immediately stopping all gas flow through the service line.
- The ESV provides a 100% seal.
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For gas network safety, T.D. Williamson France S.A., in cooperation with Gaz de France, has designed and developed the Emergency Shut-Off Valves (ESV). (In French, it is called DPB for Dispositif de Protection de Branchement.)
The TDW Emergency Shut-Off Valves are manufactured according to ISO 9001.
Function
- In case of service pipe damage during excavation, the ESV will instantly shut down the gas supply.
- After the line has been repaired, the ESV can be reopened by applying back pressure at a remote downstream location (regulation or meter box). Once the upstream and downstream pressure are equalized, the ESV opens automatically.
Installation
- This safety device has been designed to be inserted directly in the outlet of most electrofusion branch connection fittings available on the market.
- Simple installation procedure eliminates need for specialized training.
The Emergency Shut-Off Valve can be calibrated on demand for other gases, flow rates and pressures.
For more information and capabilities, please call T.D. Williamson S.A. Sales Department: ++32 67 28 36 11. |
