1. The valve works with the recirculation bypass valve to maintain the safe operation of the system.

2. The main disc moves up and down. When the medium is flowing backward, the bypass valve closes the passage under the action of the medium pressure and spring. At this time, the bypass valve opens. When the main disc is fully opened, the bypass valve closes.

3. The disc seal is made of stainless steel surfacing. It has strong abrasion resistance, strong scratch resistance and reliable sealing.

4. valves should be installed vertically.