Automatic Recirculation Valve

Mr.Naoki Sawamur visits Datian Valve factory

On November 14, 2019, the famous Japanese valve manufacturer sawamura Valve Co., Ltd. and its president, Mr. Naoki sawamura, came to our company for inspection. Mr. Yu Chengshan, chairman of the company, warmly welcomed the arrival of Naoki sawamura, accompanied Naoki sawamura to conduct a comprehensive inspection and understanding of the company’s production base, and then conducted in-depth exchanges on technology and business. Since its establishment in 1925, SAWAMURA Co., Ltd. …

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What Is A Centrifugal Pump Minimum Flow Bypass Line?

What Is A Centrifugal Pump Minimum Flow Bypass Line?

Centrifugal pumps rely on fluid to keep cool and lubricated while operating. They also rely on the fact that discharged fluid has somewhere to go. But what if the process dictates it needs only a fraction of the pump’s minimum flow requirement? What if there’s a closed valve downstream? What happens when a pump’s basic hydraulic needs are no longer met? This is where a minimum flow bypass line …

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Pump Run Out Protection

Pump Run Out Protection

Normally pump protection valves are limited to minimum flow protection; however, severe damage can occur to the pump and driver by exceeding the intended operating range of the pump. Damage due to excessive flow can be eliminated by designing a “Maxi-Flow” as an addition to the standard minimum flow valve. Excessive flow protection is achieved by installing an insert with a row of orifice holes into the main valve body. …

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Automatic Recirculation Valves Start-Up

Automatic recirculation valves 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 …

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Automatic Recirculation Valves 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. …

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PRECAUTIONS WHEN USING BACK PRESSURE VALVE

Precautions when using back pressure valve

Avoid resonance with the system. When used with a pulsation damper, the pulsation damper should be placed between the pump and the backpressure valve to absorb the peak flow between the pump and the backpressure valve. Slow down the wear rate of the backpressure valve. For outdoor use, a protective shed or a protective cover should be added. Before performing any maintenance on the backpressure valve, stop the equipment, …

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Use of automatic recirculation valve

Use of automatic recirculation valve

The automatic recirculation valve is mainly installed at the outlet of the centrifugal pump. When the centrifugal pump outlet flow is lower than the minimum flow, the pump protection valve is bypassed, and the minimum flow of the pump design is bypassed to the pump suction device to avoid centrifugation. The pump is damaged due to overheating. PERFORMANCE ADVANTAGES OF AUTOMATIC RECIRCULATION VALVES The automatic recirculation valve (ARC valve) …

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3 Way Auto-reflux Valve

3 Way Auto-reflux Valve Application and Features

There are many types of auto-reflux valves. The 3-way auto-reflux valve we have today has three ports, one in and two out, (left in, right and bottom). Unlike ordinary valves, there is an outlet at the bottom, when the internal spool is in different positions. When the outlet is different, for example, when the spool is at the lower part, the left and right sides communicate. If the spool is at the …

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