NOTE: When regulator is installed above the line or in a veritcal line on steam service, the control pipe must have a loop to form a water seal to prevent steam from contacting the diaphragm.

• 注：在蒸汽应用中，如果调节阀安装在管道的上方或安装在垂直管道上，则控制管道必须有一个回路，以形成水密封，防止蒸汽接触隔膜。