Excess flow valve for gas systems

Documentation Video
GST®

APPLICATIONS

  • Suitable for all types of gas as specified in EN 437 and DVGW G260/2013 standards (Methane, Butane, Propane).
Technical data
Standard and certificationDIN 30652-1
DVGW TRGI 2018
DVGW TRF 2021
Pressure15–100 hPa
Working pressure15–100 hPa
Temperature-20 °C ÷ +60 °C
FittingsEN 10226-1 R/Rp thread
Pressure dropΔp < 0.5 hPa
Overflow value VL37.5 l/h at 100 mbar (gas)
Fs min1.30
Fs max1.45
External heat resistance650 °C for 30’ externally
Internal heat resistance120 °C for 10' (with outside temperature at 200 °C)
DVGW

  • Excess flow valve for gas systems.
  • GST® is a DIN 30652-1 certified device that blocks the gas flow automatically when the flow rate exceeds the minimum trip threshold of the device (in the event of tampering, accidental system disconnection, e.g. in a fire or if the pipes burst).
  • The GST® is equipped with an automatic reset system.
  • Available as a single fitting or, thanks to its compactness, as a device built into the shut-off valves.
  • Does not require maintenance.
  • Produced by TECO since 2002.
  • TECO can develop customised versions on request.

GST® | Video

Operation GST®

Operation GST Teco
GST Teco

RELIABILITY

GST® safety devices must guarantee reliable closure only within the tight parameters defined by the DVGW VP305-1 German product standard.
Failure to operate or unwanted closure could potentially create very hazardous situations; for this reason, despite its simple construction, the GST® undergoes strict checks during the manufacturing process. Its reliability is defined by the quality of the components and continual improvement of the manufacturing processes through numerous tests on each lot.

All internal parts of the GST® are built to ensure long-term operation.
The spring in the GST® is fully protected from the flow of gas (patented) so that it does not come into contact with impurities that could alter its proper operation over time. For the same reason, the overflow orifice is also protected when the cut-off is open.
Moreover, the GST® can dampen any flow peaks when attaching a gas appliance, which could cause the device to close.
GST Teco

ALL GST® DEVICES ARE 100% TESTED AND THE TEST PARAMETERS ARE TRACEABLE WITH A UNIQUE IDENTIFICATION CODE FOR EACH DEVICE.

Datasheet GST®

POSITION COMPACT GST Teco
COMPACT INSTALLATION GST Teco
PRESSURE DROP GST Teco

INSTALLATION GST®

INSTALLATION GST Teco

* Where possible, the GST® is usually installed upstream from the gas meter.

INSTALLATION GST Teco

* If the supply line is managed by the gas distribution company, the GST® can be installed downstream from the gas meter.

 
* The choice of GST® is the same regardless of whether it is upstream or downstream from the gas meter.
INSTALLATION GST Teco

In installations with plastic pipes, in addition to using the FIREBAG®, it is mandatory to install a GST® on each offtake (according to the TRGI standard).

GST® | Documentation

 File descriptionDocument typeLanguageLanguage
Brochure/Catalogues
GST Catalogue (English)
  • Lang: en
Tender Specification Texts
GST - Tender Specification Text (English)
  • Lang: en
Declarations of Conformity
GST Declaration of Conformity
  • Lang: it
  • Lang: en
Declarations of Conformity
GST Declaration of Conformity 9hPA
  • Lang: it
  • Lang: en
Product Data Sheets
GST - Product Data Sheet
  • Lang: en
Use Directives
GST - FI00033_R4 - Use Directives
  • Lang: it
  • Lang: en
  • Lang: de
  • Lang: es
Specification texts
GST: Excess flow device
VP305-1 DVGW safety device.

It blocks the gas flow automatically, with a trip range from fs min. 1.30 to fs. max 1.45. Pressure drop < 0.5mbar;
automatic reset with a flow of 37.5 l/h at 100 mbar (gas).
Threaded connections. Available as a single fitting or, thanks to its compactness, as a device built into the valves does not require maintenance. For all types of gas in accordance with EN 437 and DWG G260/1 (Methane, Propane and Butane).
Pressure range 15 - 100 mbar.
Working temperature -20°C + 60°C.
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