Automatic Recirculation Valve, 1-16 IN, 150-600 LB, Flanged

Technical Specifications

Product Name: Automatic Recirculation Valve, Pump Protection Valve
Normal Size Range: 1-16 Inch, DN25-DN400
Normal Pressure Rating: Class 150-600 LB, PN10-PN100
Main Materials: ASTM A105, A350 LF2, A182 F11, F304, F304L, F316, F316L
Sealing Material: NBR, FKM, PTFE, SS
End Connection: Flanged
Temperature Range: -29°C to 425°C

The Automatic Recirculation Valve is a protective device for centrifugal pumps. It automatically safeguards the pump from cavitation damage or instability, particularly when conveying hot water or other media at low load operation. If the pump flow falls below the preset threshold, the bypass fully opens to maintain the minimum required flow for the pump. Even with zero flow (i.e., when the pump is running fully closed), the bypass ensures that the minimum flow is maintained for automatic recirculation. Pressure is reduced through a multi-stage pressure-reducing bypass valve.

The Pump Protection Valve is suitable for high-pressure differential bypass applications, with a maximum pressure differential of 30 MPa. The specific selection is determined by the factory. The multistage decompression (M-type) bypass helps eliminate noise caused by high-speed flow, and prevents damage from cavitation erosion and excessive wear on valve components.

Main Performance Parameters

» Automatic Recirculation Control Valve: Includes recirculation flow decompression facilities. High-pressure media flow through several small-diameter passages, dissipating energy and reducing stress.
» Pump Protection: The valve provides recirculation at very low flow rates, ensuring pump cooling. During normal operation, no recirculation is needed, saving electricity and water.
» No Electrical Wiring Needed: The automatic recirculation control valve does not require electrical wiring, nor does it need two valves in series (one for adjustment, one for cutting). This eliminates the need for complicated setups in high-pressure systems, which minimizes erosion from high-speed flow.
» Efficient and Reliable: The valve features a reasonable design, stable operation, minimal noise, and long service life. It is capable of completely replacing imported products.
» Simple Structure: The valve has a simple structure, low cost, and long lifespan, making it ideal for low-pressure working conditions.
» Installation Flexibility: It can be easily installed either vertically or horizontally on the pump outlet.
» Applicable Mediums: Suitable for water, oil, methanol, and other liquid mediums.
» Working Temperature: Ranges from -196°C to +300°C.