上海立新比例溢流阀上海立新比例溢流阀部分型号：dbem10-30/5y dbem10-30/10y dbem10-30/20y dbem10-30/31.5y dbem10-30/5xy dbem10-30/10xy dbem10-30/20xy dbem10-30/31.5xy dbem20-30/5y dbem20-30/10y dbem20-30/20y dbem20-30/31.5y dbem20-30/5xy dbem20-30/10xy dbem20-30/20xy dbem20-30/31.5xy dbem30-30/5y dbem30-30/10y dbem30-30/20y dbem30-30/31.5y dbem30-30/5xy dbem30-30/10xy dbem30-30/20xy dbem30-30/31.5xy