[建] combined pressure and vacuum relief valve

lián hé yā lì zhēn kōng pái chū fá ㄌㄧㄢˊ ㄏㄜˊ ㄧㄚ ㄌㄧˋ ㄓㄣ ㄎㄨㄥ ㄆㄞˊ ㄔㄨ ㄈㄚˊ