Note: In horizontal system installations, Chainwheel Operators should be generally mounted with operator below valve (inverted valve) to maintain clearance between chain and system piping.

• 注：在水平安装系统中，链轮操作机构通常应该将操作机构安装在阀门（逆止阀）下方，以保证链条和系统管道之间有足够的空间。