The DATIAN Automatic Recirculation Valve (ARC valve) is a kind of pump protection device. It automatic protect centrifugal pump when pump body occur cavitation damage or unstable (especially conveying hot water at low load operation medium).
solution for pump protection
Modern industrial equipment process request centrifugal pump are basically work under condition of variable flow. An automatic recirculation valve (ARC valve) is a multifunctional valve whose primary purpose is to ensure that a pre-determined minimum flow is assured through a centrifugal pump at all times. This is important as centrifugal pumps suffer from overheating and cavitation and can be permanently damaged if they run dry.
Through many years of research and development, continuous innovation and practice, shanghai datian valve Co. research ZD series Automatic recirculation control Valve, to prevent overheating, serious noise, unstable and erosion damage of centrifugal pump under low load operation. As long as the flow rate of the pump valve. below a certain value, the bypass backflow mouth will automatically open to ensure necessary minimum flow of pump.
APPLICATION ON
- Chemical industry
- Petrochemical industry
- Steel factory
- Fire protection system
- Traditional power plant
- Paper-making industry
- Shipment/shipping
- Environmental protection industry
Installation
The DATIAN automatic recirculation valves are best installed directly on the outlet of the pumps for which they are meant. The valve layout is mainly based on the pump curve. Ensure that the valves are installed on the right pumps. The flow direction is indicated on the valve nameplate. This nameplate is riveted to the valve body. On this nameplate you will also find the valve’s commissioning- or fabrication number. This number is unique and therefore different for each valve. This ensures that the valves can always be related to the right pump. In case of spare parts requirements always refer to this number.
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Start up
Before start-up all lines must be flushed and the medium must be free from solids. Our valves are not designed to handle these. The lifetime of the valves will be strongly reduced due to increased wear when the fluid handled contains solids.
If the lines are not clean they can be flushed with the valves installed. This should however be done with the valve internals removed and at reduced pressures. Note that with the removal of the internals the non-return- and pressure letdown function are no longer present. After flushing the internals shall be reinstalled again. If the medium contains solids in the normal process we advice you to install a strainer with a mesh aperture of 0,25 to 0,5 mm in front of the pump inlet, because solids could block the movement of the valve internals.
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Installation and maintenance
Before the valve is shipped all connections (flanges or weld connection.) are covered with plastic caps. This way the valve internals are protected against the ingress of dirt and damage. Before the valve is installed these covers must be removed. After a visual inspection on possible shipping damages and eventual presence of dirt/solids the valve can be installed in the direction of the arrow. DATIAN ZD series ARC are very maintenance friendly. The only maintenance required is the exchange of the soft-parts and the cleaning of the internals during the annual inspection and the exchange of springs every 3-5 years depending on the operating conditions. Other parts only have to be exchanged when they are damaged or when there are changes in process conditions.
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