Never swap gauges or inlet fittings, and never change gas service.
禁止交换量表或入口配件，禁止改变气体设施。
2
Company specializing in the production "Huangjia" brand brass ball valve, gate valve, globe valve, check valve, filters, gas valves and pipe fittings and other products.
公司专业生产“皇家”牌铜球阀、闸阀、截止阀、止回阀、过滤器、煤气阀门和管道配件等系列产品。
3
All valves, regulators and gauges proposed for the gas distribution lines shall be of good quality, stainless steel type, made for specific gasses and shall be provided with standard fittings.