The adjustment control on the valve when received is set in the wide open position. (Screwdriver slot being in the perpendicular position). See Fig. #1. Do not adjust unless necessary.

• 所收到的阀门上的调节控制设置在大开的位置。（螺丝刀放在垂直位置上）。参阅型号1。除非必要，否则不要调节。