Orifice Assembly VMO

The valVario measuring orifice VMO is installed in gas control and safety systems, as well as in air systems used in industrial and commercial gas heat generation. It can serve as a restricting orifice when used in conjunction with valVario gas solenoid valves and gas control valves.

The test points are located in the measuring orifice housing. The measuring orifice VMO is a good-value alternative in areas where no standardized measuring orifice is required. The replaceable washers with different hole sizes allow the orifice to be adjusted perfectly to the local operating conditions.

Features

• For use as a measuring or restricting orifice
• Can be combined with valVario valves and regulators
• Air and gas flow rate diagrams to facilitate configuration
• Easy installation thanks to flanges with internal thread
• Replaceable aluminium washers for optimal adjustment to local operating
  conditions

	Documentation Manufacturer's Product Brochure Manufacturer's Technical Information Manufacturer's Installation Instructions
	Ordering Information Model valVario Size Orifice* Price (US List) Order Now VMO 110N05M06 1 6mm $68 VMO 115N05M06 1 6mm $68 VMO 120N05M12 1 12mm $101 VMO 125N05M12 1 12mm $110 VMO 240N05M16 2 16mm $126 VMO 250N05M32 2 32mm $126 *Contact Combustion 911 for other orifice sizes.
	Applications Click on images for close-up view. Self recuperative burner for direct heating systems Self recuperative burner in a direct heating system with an inductor for evacuating the flue gases from the furnace. The inductor generates a vacuum with a centrally positioned nozzle and thus draws the flue gases out of the furnace chamber through the burner's heat exchanger. The measuring orifices VMO are designed to record the gas and air flow rates. Continuous control with pneumatic ratio control system With this type of control, the mixture setting can be maintained over a wide control range while at the same time preventing air deficiency. This type of control is used in melting furnaces in the aluminium industry or in regenerative incineration installations in the environment industry, for example. Here, the measuring orifice VMO is designed to record the gas flow rate.
	Specifications General Specifications Type of gas: natural gas, LPG (gaseous), biologically produced methane (max. 0.1 %-by-vol. H2S) or air; other gases on request (The gas must be dry in all conditions and must not contain condensate.) Max. inlet pressure pe: max. 500 mbar (7.25 psig). Ambient temperature: -20 to +60°C (-4 to +140°F), no condensation permitted Storage temperature: 0 to +40°C (-4 to +104°F). Housing: aluminium Connection flanges with internal thread: NPT to ANSI/ASME.