| 摘要 |
<p>The valve (18) has a check valve located in a main duct. A recirculation valve is located in a recirculation duct forming a branch of the main duct. The recirculation valve is provided with a rotary shutter and a seat. The recirculation valve comprises a pressure-balancing mechanism designed such that a surface oriented toward the seat is not involved in sealing the recirculation valve, and the surface is subjected to fluid pressure (P2) equal to pressure (P1) exerted on upstream surfaces of the shutter.</p> |
