The DRV is sometimes referred to as “Variable Orifice Double Regulating Valve” [VODRV]. This is particularly relevant in countries other than the UK where this valve is used as a Commissioning Valve for commercial reasons. Although the cost of purchase is lower, the commissioning cost is potentially higher because of the complexity of establishing the flow rate. The flow rate is calculated using the Kv value for each handwheel setting and the? P across the valve. The flowrate can be established using graphs or a specialist flow computer.

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