AST RV-6000 changeover valves are three-way devices for flow selection in a pipeline, typically used to connect two safety valves to a single pressurized system. These devices ensure the possibility to have one safety valve always in operation and one in “stand-by”, ready to come into operation. These changeover valves are recommended to increase plant availability or to avoid plant shutdown, avoiding any relevant economic damage.
RV-6000 changeover valves can be installed individually upstream of the safety valves or upstream and downstream of the safety valves, when outlet is connected to a closed header. If inlet and outlet changeover valves are used, a mechanical interlocking system prevents human error during the operation.
Our simple design allows easy assembly / disassembly; easy removable seats allow quick and economic maintenance.
These valves are suitable for a wide range of applications, such as high temperatures, cryogenic service, lethal fluids and many others.
Two safety valves can be installed together and one can be kept as spare.
Changeover valves have been designed to minimize pressure drop; flow areas are always bigger than inlet or outlet connections.
Materials: carbon steel, alloy steel, hastelloy, monel and other materials upon request.
Accessories: the changeover can be equipped with a variety of accessories such as limit switches and pneumatic or electric actuators. It is available with stem bellows for a bubble tight sealing.
Sizes / Pressure Classes
Size: from NPS 3/4 to NPS 16. Rating: up to ASME 2500.
Design Codes & Product Standards
EN 12516, EN 1092, ASME B16.34, ASME B16.5, ASME Sect.VIII, IEC 60534.