When joining the fixed end of a single union valve, place the ball in the open position to allow for proper drying and to avoid primer or solvent cement contacting internal components of the valve.

• 在连接单个管套接阀门的固定端口时，将球体放置在开启位置，使得阀内部件能够得到干燥并避免底漆或液状粘固剂接触到阀内件。