NKS, MKS - Bopp & Reuther Sicherheits- und Regelarmaturen GmbH

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4 NKS, MKS Qualification Successful qualification of Bopp & Reuther gate valves by AREVA NP GmbH, Erlangen, Germany As part of a gate valve exchange program at a German nuclear power plant Bopp & Reuther’s low pressure gate valves were subjected to an extensive qualification procedure. The qualification was carried out by the AREVA NP notified test labatory in Erlangen, Germany. The gate valves were DN 80 with bodies constructed from welded dye forged shells. Overview of the the test conditions: • Functional tests at room temperature • Endurance testing at 160°C • Cycle testing of opening/closing, 50 cycles at ∆p of 7 bar • Tightness tests before and after each test run • Failure testing, e.g. after actuator malfunction Measuring parameter The results at the successful completion of the tests showed: • Functionality during the entire test period and under all conditions • Ample reserves in actuating forces at all loading cases • Reliability, integrity and functionality in accordance with all requirements • High resistance to wear • Mechanical stability • Seat tightness at low and high pressures Effective actuator power Torque between the actuator and the gate valve Valve stem force (resistance strain gauges) Temperature of the valve stem during operation Temperature of valve body Pressure upstream and downstream of the gate valve
Qualification Test report of the AREVA NP GmbH, Erlangen, Germany 5
Page 1 and 2: Low and Medium Pressure Wedge Gate
Page 3: Design details Body Shell forged ma
Page 7 and 8: Gate Valve Enquiry Form (specificat

NKS, MKS - Bopp & Reuther Sicherheits- und Regelarmaturen GmbH

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