Emergency Control Valve ECV

• Normally is the property of the gas supplier
  • Who has to maintain and lable it
  • Notify gas supplier if ECV is faulty
• ECV should confirm to BS1552
• 'Nitting' - plug stops in the fully on or off position
• Must be where the pipe enters the building
• Must have an on/off indicator label
• The handle must stop the gas in its lowest position
• A label naming who to contact in an emergency nearby (usually on the meter)

Medium to Low Pressure Governor (Regulator)

• 2bar pressure reduces to 21mbar operating pressure
• Its sealed by the gas supplier and set at 19-24mbar
• Governor Lock up - closes when pressure builds up (24-28mbar)
• Most appliances have their own regulators (governors)
• Incorporates
  • Overpressure protection (OPSO)
  • Under pressure protection (UPSO)
  • Excess flow device - prevents UPSO being reset if there are open ends downstream of the regulator
• Testing
  • Let-by and tightness test in accordance with IGE/UP/1B
  • Working pressure test - with 3 bigest hobs ON on a gas cooker
  • Standing pressure test
  • Under pressure shut off (UPSO) test
  • It should not be possible to to reset the UPSO until all control taps have been closed
• Checks
  • Only authorised by gas supplier operaive can break the seal
  • Adjust the outlet pressure periodically
  • Leather diaphragm (old appliances) may need lubricating