Non-Return Valves

Secomak Fans, Blowers and  Exhausters

Non-Return Valves

Non-return valves are a means of preventing a reverse flow and in accordance with the Gas Act 1972, must be fitted in the gas line where air at higher pressure is mixed with fuel gas prior to combustion and many types of industrial burners. 

Non-return valves should also be fitted in the corresponding air line where there is a possibility of the pressure falling below that of the gas, a condition frequently encountered when starting up. 

Larger sizes of non-return valves can be fitted on the outlet side of the gas meter to give general protection and smaller sizes should be fitted on the inlet pipe to any appliance where gas and air are mixed.