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In oil fields the oil is not available as pure crude oil, which means that during oil extraction a mixture of oil and water or crude oil and sand is conveyed from the ground. The proportion of oil is separated in order to obtain crude oil that is suitable for further processing. After separation of the oil content, the saline water contaminated with aggressive particles is pressed into the ground through small and vastly branched injection boreholes around the periphery of the oilfield. Thus the pressure on the oil-bearing strata increases, whereby the mixture of oil, solid particles and water is delivered at the drilling site. An oil production facility in Sudan has installed pilot-operated back pressure regulators of the type Mankenberg RP 820 Eck.
Since the operational area of the single-seated angle valves requires a very high level of resistance to corrosion, they have been entirely manufactured from Duplex steel (1.4462) and designed for temperatures from -10 through to +100 °C. A maximum pump capacity of 100 m³/h flow rate was indicated. At zero extraction rate, the maximum delivery pressure is 83 bar at up to 95 °C, so the nominal pressure of the valve has been designed for PN 160. The back pressure regulators have been arranged in the course of the injection line directly downstream of a strainer. The valves have the task of building up a constant counter-pressure to the pumps and, in so doing, they offer protection from damage through cavitation.
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