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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 35842-2018 |
Technical requirements for pre-insulated directly buried valve of urban heating 城镇供热预制直埋保温阀门技术要求 |
China National Standards Pre heat requirements |
 English PDF |
| GB 25131-2010 |
Safety requirements for water chillers (heat pump) using the vapor compression cycle 蒸气压缩循环冷水（热泵）机组 安全要求 |
China National Standards Pre heat requirements |
English PDF |
| GB/T 21094-2007 |
Pre-heat requirements for starterless tubular fluorescent lamps 无启动器管形荧光灯预热要求 |
China National Standards Pre heat requirements |
English PDF |
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