fluorine lining gate valve

Basic knowledge of insulation globe valve

by:Lianke Valve     2022-09-16
Today, I would like to introduce the basic knowledge about thermal insulation globe valve and its structural characteristics and application. Insulation globe valves are mainly used in petroleum, chemical, metallurgical, pharmaceutical and other systems to transport high-viscosity media that solidify at room temperature. The insulation jacket of the BJ45W DC jacket insulation globe valve is welded between the two flanges of the valve, and the side and bottom of the valve are provided with two connection ports for the insulation jacket. The DC insulation shut-off valve is especially suitable for pipelines in the chemical and fertilizer industries. The steam in the jacket prevents the medium from crystallizing. Product features of the heat preservation globe valve: the opening and closing parts of the heat preservation globe valve are plug-type discs, the sealing surface represents a plane or a conical surface, and the disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lift rod type (the valve rod is raised and lowered, and the handwheel does not lift), and there is also a lift rotary rod type (the steering wheel and the valve rod rotate and lift together, and the nut is set on the valve body). The bellows globe valve is only suitable for fully open and fully closed, and adjustment and throttling are prohibited. The thermal insulation globe valve has compact structure, beautiful appearance and excellent performance. The valve disc and the valve stem adopt an active connection structure, which is flexible in opening and closing. The valve stem is designed with a sealing pair, which improves the service life and sealing performance of the valve. The sealing surface is made of alloy steel or hard alloy, and the flap and valve seat are sealed with iron-based alloy surfacing or Stellite drill-based hard alloy surfacing, which has good wear resistance, high temperature resistance, corrosion resistance and scratch resistance. ,long lasting. The surface of the valve stem is nitrided, which has good corrosion resistance and friction resistance. The packing is made of flexible graphite, which has reliable sealing, flexible operation and small opening and closing torque. The heat preservation globe valve has good heat preservation and cold preservation characteristics, and the diameter of the valve is consistent with the diameter of the pipe, and at the same time, it can effectively reduce the heat loss of the medium in the management. Jacket interfaces are set on the side and bottom of the valve, which are used to inject steam or other heat preservation and cold preservation medium to ensure that the medium in the valve can work normally. It is mainly used in the system pipelines of chemical, petroleum, pharmaceutical, metallurgy and other industries to transport the medium that will solidify and easily crystallize at room temperature. The insulation globe valve can be selected from various piping flange standards and flange sealing surface types. The transmission mode can be manual, worm gear rotation, or electric, pneumatic, hydraulic and other driving methods, which are convenient for long-distance control and meet the different needs of users. . Installation and maintenance 1. The stop valve operated by handwheel and handle can be installed in any position of the pipeline. 2. The handwheel, handle and Weidong mechanism are not allowed to be used for lifting. 3. The flow direction of the medium should be consistent with the direction of the arrow shown on the valve body. Insulation globe valve, also known as cut-off valve, is due to the small friction between the sealing surfaces during the opening and closing process, it is more durable, the opening height is not large, it is easy to manufacture, and it is convenient to maintain. It is not only suitable for medium and low pressure, but also suitable for high pressure. Its closing principle is that relying on the pressure of the valve stem, the sealing surface of the valve disc and the sealing surface of the valve seat are closely fitted to prevent the flow of the medium. The insulation globe valve only allows the medium to flow in one direction, and has directionality during installation. Its structural length is longer than that of the gate valve, and at the same time, the fluid resistance is large, and the sealing reliability is not strong during long-term operation. Insulation globe valves are divided into three categories: straight-through, right-angle and straight-through oblique globe valves. When the insulation globe valve is opened, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc. The introduction of the insulation shut-off valve is here.
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