?压力调节螺钉
... pressure regulating relief valve；压力调节安全阀 pressure regulating screw；压力调节螺钉 pressure regulating sleeve；压力调节套 ...
压力调节翼形螺钉
These valves use a screw type valve instead of a simple flap, and they have a pressure regulating mechanism that will vent water to the ground if the intake pressure exceeds a set level.
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