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The Mucon® H Series Iris Diaphragm Valve was designed specifically for open discharge applications on outlets of small  and intermediate bulk containers (Rigid IBCs). This low cost, compact valve has been fitted to many thousands of IBC’s  globally all over the world. Its ease of operation, reliability and excellent regulation of discharge rates make it extremely popular with operators, the world over.


  • 100mm, 250mm and 300mm diameter iris valves are made from gravity die cast aluminum with an anodised finish
  • 150mm and 200mm diameter iris valves are made from high pressure die cast aluminum with an anodised finish


  • Used as an outlet valve for the regulation of material flow from the bottom of intermediate bulk containers
  • Used as an outlet valve on dust collection hoppers
  • Can be used for glanding around plastic pipes on extrusion cooling baths
  • Also for choking the ‘necks’ of big bags, where a smaller valve is required
  • Can be certified for ATEX zone 22D provided that an anti-static diaphragm material is used


  • Additional notches for enhanced flow regulation can be added
  • Available also is a uiqck release transit cover with gasket for extra security during transportation of IBCs
  • A quick release adaptor for valve mounting (150mm and 200mm iris valves)
  • Also a stainless steel top clamp plate (subject to special quotation)


  • It is non jamming
  • It is low cost
  • Excellent regulation of discharge rates
  • Dust tight closure
  • It has a wide range of diaphragms to suit a number of product applications
  • Spare diaphragms and liners are inexpensive and easy to replace
  • Easy and efficient valve to operate and maintain
  • Safe, gentle and strong – able to handle a large variety of products


  • Features a single diaphragm for dust tight closure
  • Simple construction suitable for materials up to 900 kg/m³
  • Diaphragm adjustment in-situ hand operated
  • Features a quick release adapter
  • A disposable polythene liner can be incorporated with the quick release adapter
  • A wide selection of diaphragms are available to suit a variety of applications
  • Contact parts are FDA approved
  • Bore sizes from 100mm to 300mm
  • 150mm & 200mm valves have multi notched bodies as standard
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Data sheets

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