Feedwater heater isolation valves may experience seat leakage or thermal binding. Anchor Darling Double-disc gate valves provide the solution to both problems.
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Theoretical analysis of inertially irrotational and solenoidal flow in two-dimensional radial-flow pump and turbine impellers with equiangular blades
Using the theory of functions of a complex variable, in particular the method of conformal mapping, the irrotational and solenoidal flow in two-dimensional radialflow pump and turbine impellers fitted with equiangular blades is analysed. Solutions are used to derive analytical expressions for a number of parameters which are important for practical design of radial turbomachinery, and which reflect the two-dimensional nature of the flow field. By F. C. Visser, J. J. H. Brouwers, and R. Badie. Reprinted from Journal of Fluid Mechanics, Volume 269, 25 June 1994, pp. 107-141.
Anchor/Darling Isolation Valve Application - Eliminating High-Pressure Valve Leaks - Technical Article
Small Y-pattern globe valves installed in isolation service have one of the highest failure rates of any equipment in fossil power plants. It is not uncommon for maintenance personnel to replace these valves as frequently as every six months. Flowserve Anchor/Darling double-disc gate valves installed in high temperature isolation service have remained tight for as long as eight years.
Durametallic® Double CRO Installation Instructions
Anchor/Darling Pump Turbine Exhaust Check Valves Technical Article
Wedge-type gate valves installed in Reactor Water Clean Up (RWCU) systems can fail to open due to thermal binding. Flowserve Anchor/Darling Double-disc Gate valves resist thermal binding.
Flowserve ValveSight 2.0 Software for Logix MD+ Digital Positioner FDT certificate.
This paper describes the development of the Type A Stored Energy Actuator, a line of actuators for a broad range of globe and gate valves for critical service applications in nuclear power plant feedwater and steam systems.
Anchor/Darling Swing Check Disc Pin Failure Technical Article
Tilting-Disc check (TDC) valves are designed for use in applications where rapid response (fast opening or closing) is required. The center of gravity of the Anchor/Darling TDC disc is very close to the axis of rotation thus, the disc can open or close very quickly without damage to the body, disc or seat. Since the valve closes quickly upon flow reversal, no significant fluid velocity is developed in the reverse direction, thereby minimizing the potential for severe waterhammer.