KHB-NPT1/2 KHB-NPT3/4 KHB-NPT1 KHB-NPT 11/4 高压球阀 KHB-NPT1/2 KHB-NPT3/4 KHB-NPT1 KHB-NPT 11/4 无锡市昌林自动化科技有限公司