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An Automatic Recirculation Valve (ARV) is typically used in centrifugal pump systems to ensure that a minimum flow is maintained through the pump, even when the flow rate drops below a certain threshold. This is necessary to prevent the pump from running dry, which can lead to damage and failure.
The primary function of an ARV is to divert a portion of the pump's discharge flow back to the pump's inlet when the flow rate falls below the predetermined minimum. By recirculating the flow, the ARV ensures that the pump remains adequately lubricated and cooled, even during low flow conditions.
The need for an Automatic Recirculation Valve arises in various industrial applications where centrifugal pumps are used. Some common instances include:
Process Industries: ARVs are often employed in industries such as oil and gas, petrochemicals, chemical processing, and power generation. These industries rely on centrifugal pumps for fluid transportation, and the ARV helps protect the pumps from damage due to low flow situations.
Cooling Systems: In large-scale cooling systems, such as those found in power plants or HVAC (heating, ventilation, and air conditioning) systems, ARVs are utilized to maintain a minimum flow rate through the pumps, ensuring efficient heat transfer and preventing overheating.
Water Treatment: ARVs can be found in water treatment plants where centrifugal pumps are used to circulate water through various processes. They prevent the pumps from running dry and maintain a continuous flow for effective treatment.
Refineries: In refineries, ARVs are crucial for protecting pumps that handle various fluids, including crude oil and its derivatives. They prevent damage to the pumps and maintain the required flow rates during varying process conditions.
The specific requirements for using an Automatic Recirculation Valve depend on the characteristics of the pump system and the application's demands. Consulting with pump system engineers or industry experts is recommended to determine the precise need and optimal implementation of an ARV in a given situation.
Applications Of ARC Valve
Three protection ways for pump
Minimum requirement of continuous circulating system pump is unrelated to the discharge of Process flow changes system. After setting of minimum flow, through orifice plate directly backflow to a storage tank. Although continuous minimum flow circulation can protect the pump very good, the pump must provide greater power output to ensure system process flow plus recycle flow, which causing additional energy waste.
Control circulatory system is assembly by the check valve, flow gauge, minimum flow control valve, control circulation system, control circulation system can provide minimum flow protection, when process flow is greater than the minimum flow of the pump, loop closed, no extra energy loss. But the system is complex, control components, purchase, installation, maintenance cost is higher.
Automatic recirculation valve set check valve, flow perception, bypass control valve, multi-stage step-down in one, do not need power, control system and wiring, essential safety. Taking up small space, reducing the possibility of high-speed fluid to malfunction to a minimum, with lower installation and maintenance cost, It is the priority pump protection way of the modern industrial process.
ZD series ARC valve is suitable for bypass with high-pressure differential, a maximum pressure differential is 30MPa, and the specific choice is determined by the factory. Multistage decompression type M type bypass can eliminate noise made by high-speed flow medium, prevent damage of cavitation erosion, and braising to valve components.
According to the difference of inductive main flow, the main valve disc check cone of the ARC valve will automatically move to a certain position. At the same time, the main valve disc drives the bypass valve stem, transfers the movement of the main valve disc to bypass, through control bypass valve disc position, changes the bypass throttling area, so as to control bypass flow. When the main valve disc back into the valve seat closed, all flow backflow through the bypass. When the valve discs rise to the top position, the bypass is fully closed, all the flow of pump flow to the processing system. This valve set four functions in one body.
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