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1, the principle of insulation shut-off valve: Insulation shut-off valve, is mainly used in petroleum, chemical, metallurgical, pharmaceutical and other systems to transport at room temperature will be solidified high viscosity medium is BJ45W DC Jacket insulation globe valve insulation Jacket welding installed in the valve between the two flanges, the valve side, the bottom is provided with two thermal insulation jacket connector. DC insulation shut-off valve is particularly suitable for chemical, fertilizer industry pipeline, the jacket contains steam to prevent the media crystallization. Insulation cut-off valve is widely used in petroleum, chemical, metallurgical, pharmaceutical and other systems. 2, thermal cut-off valve Description: Insulation cut-off valve opening and closing pieces are plug-shaped valve, the sealing surface was flat or tapered surface, the valve flap along the fluid center line for linear motion. Stem movement form, lifting rod (stem lift, hand wheel does not lift), there are lifting rotary rod (hand wheel with the stem rotating together, the nut is located in the valve body). Bellows globe valve only applies to fully open and fully closed, does not allow for regulation and throttling. Insulation cut-off valve is a forced-sealed valve, so the valve is closed, the pressure must be applied to the flap to force the sealing surface does not leak. When the medium from the bottom of the valve into the valve six, the operating force needed to overcome the resistance is the stem and packing friction and the pressure generated by the media thrust, off the valve force than the valve opening force, so the valve The diameter of the rod should be large, otherwise it will happen to the top of the valve stem failure. In recent years, since the self-sealing valve appears, the cut-off valve of the media flow to change over from the top of the valve into the valve cavity, then under medium pressure, the valve closing force is small, and open the valve force, the valve stem The diameter can be reduced accordingly. At the same time, in the medium, this form of valve is also more stringent. China's valve "three to" have provided that the flow of the valve, all from top to bottom. Insulation cut-off valve is open, the valve opening height, 25% to 30% of the nominal diameter, the flow has reached its maximum, indicating that the valve has reached the fully open position. Therefore, the full-stop position of the valve, valve stroke should be determined. 3, the advantages of insulation shut-off valve: 1) simple structure, manufacturing and maintenance more convenient. 2) small work schedule, opening and closing time is short. 3) good sealing, friction between the sealing surface is small, longer life expectancy. 4, the shortcomings of the insulation shut-off valve are as follows: 1) Fluid resistance, the required force to open and close larger. 2) Not suitable for particles with a larger viscosity, easy to caking medium. 3) poor regulation performance. 5, insulation shut-off valve application specifications: insulation shut-off valve insulation jacket welded to the valve between the two flanges, the valve side, the bottom of the insulation jacket is provided with two connections. DC insulation shut-off valve is particularly suitable for chemical, fertilizer industry pipeline, the jacket contains steam to prevent the media crystallization. Insulation cut-off valve is widely used in petroleum, chemical, metallurgical, pharmaceutical and other systems to transport high temperature medium will be solidified at room temperature.