The cleaning pig produced by Shenyang Wensheng is mainly used in petroleum, chemical industry, electrical power and metallurgy for cleaning pipeline and so on. It has the characteristics of such as simple structure, convenient operating. Application area: Before operating inner inspecting of petroleum pipeline, pig and intermittently operate oil pipeline. Clear the freezing point oil, paraffin precipitation and scale to reduce back-pressure of oil and friction, as well as oil temperature. Characteristics of cleaning pig: 1 Simple structure, convenient operating and suitable for daily maintenance; 2 Use the quick opening closure which is easy to quickly open or close the receivers & launchers; 3 There is insurance device which is safe and reliable; 4 The way-ball indicator can be installed to indicate the process of receiving and launching the ball.