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Donkin 590

NON RETURN VALVES SERIES 590 ROLLCHEK

Application

  • Non-return valves are a means of preventing a reverse flow and must be fitted (Gas Act 1972) 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.
  • Failure to fit non-return valves in these circumstances can result in explosive gas/air mixture being formed within the pipework. Bryan Donkin RMG non-return valves, which give a positive seal under all conditions of reverse pressure up to 7 barg, provide complete protection from such explosions.
  • The Series 590 is designed to meet the Standard for non-return valves IM/14.

Features

  • Easy fitting - Compact design for horizontal fitting only, valve is supplied complete with inlet strainer, inlet and outlet pressure test points as standard.
  • Easy Maintenance - Lubricatonless design is fully serviceable in situ.
  • Top Performance - Valve has high throughput capacities and gives positive seal under all conditions of reverse pressure up to 7 Barg (100 psig), and minimal forward pressure loss up to a maximum working pressure of 7 Barg (100 psig).
SERVICE CONDITIONS
Size Range:

Screwed:

2" & 3" to BS 21 Rc

 

Flanged:

DN 80, DN 100 & DN 150

to PN16:BS EN 1092-2:1997

Maximum Inlet Pressure

and Maximum Reverse 

Pressure:

7 Barg (100 psig)
Temperature Range: -10°C to +60°C
Flow Medium: Natural Gas and non-aggressive gases.
 

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