Valves and Controls for water storage heaters

Valves and control devices include:

• isolating valves – manually operated valves for isolating one section of the system from the rest
• line strainers – filter particles of solid matter from the water to protect other valves downstream
• non return valves – prevent reversed flow within, or from, the system
• pressure-reducing valves – automatically reduce the pressure to a preset level
• pressure-limiting valves – limit the pressure within preset limits
• expansion control valves – release pressure in the cold water feed pipe caused by expansion of water in the heater during normal operation
• energy control thermostats – control the input of heat energy to the water
• temperature and pressure-relief valves – release pressure in the storage cylinder if it rises to more than a preset limit
• energy cut-outs – cut gas/electricity supply to the heater if the thermostat fails
  
  

Valves must be installed so they are readily accessible for operation, maintenance and repair.