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济南市市中给水设备机械厂研制成功的国家专利产品——油压微阻缓闭止回阀,1991年获国家七五星火计划银质奖。该产品装有的油压缓闭装置为国内首创。以前的水压缓闭装置,利用管网中的水做阻尼介质,水中带有泥砂常阻塞管路和调节阀,机件长期浸水锈蚀,常使缓闭装置动作失灵。而油压缓闭装置用普通机油做阻尼介质,与管网中的介质完全隔离,既不污染水
Jinan City Water Supply Equipment Machinery Factory successfully developed a national patent product - hydraulic micro-resistance slow closing check valve, in 1991 won the national seven five-star plan silver medal. The oil pressure slow-closing device installed in this product is the first in China. In the past, the water pressure slow-closing device used the water in the pipe network as a damping medium, and mud sand in the water often blocked the pipe and the regulating valve. The parts were immersed in water for a long time and rusted, often causing the slow-closing device to malfunction. The oil pressure slow-closing device uses ordinary oil as damping medium and is completely isolated from the medium in the pipe network, and does not pollute the water.