All automatic recirculation valve products can be designed, manufactured and processed according to GB, ANSI, API, JIS, DIN, BS and other standards. Automatic recirculation valve, also known as pump protection valve or minimum flow valve or three-way return valve, is used for automatic recirculation of minimum flow of centrifugal pump to prevent damage caused by overheating, noise and vibration under low load. The automatic recirculation valve is self-operated and does not require external energy supply. In addition to the production and sales of recirculation valve products, our company also produces and sells other valve products, dedicated to provide new and old users with high-quality products and services to ensure user satisfaction.

In the process of modern industrial equipment, centrifugal pumps are basically required to work in a variable flow state, which requires automatic control equipment to be set up in the process. However, when the centrifugal pump is running below load, overheating, serious noise, instability and cavitation will cause damage to the pump. At this time, an automatic recirculation device is needed to realize the minimum flow return circulation of the pump through bypass when the pump is running below the load.

Hola Valve (Shanghai) Co., Ltd. has developed ZD series automatic recirculation pump protective valve through years of research and development, continuous innovation and practice. It is used to prevent all kinds of centrifugal pumps from being damaged due to overheating, serious noise, instability and cavitation when running below load. As long as the flow rate of the pump is below a certain value, the bypass return port of the valve will automatically open to ensure the minimum flow rate necessary for the liquid pump.