Insulation valve is mainly used in petroleum, chemical, metallurgy, pharmaceutical and other types of systems in order to transport high viscosity media will be solidified at room temperature is between BJ45W, DC jacket insulation valve insulation jacket welding to the valve two, the valve at the bottom flange, the side is provided with a heat insulating jacket connector two the. DC insulation stop valve is especially suitable for the pipeline of chemical industry and chemical fertilizer industry. The inner steam of the jacket can prevent the crystallization of medium. Heat insulation globe valve is widely used in petroleum, chemical, metallurgical, pharmaceutical and other systems.
heat preservationGlobe valve
The opening and closing parts are plug shaped valves,Seal up
Is the plane or cone, fluid along the centerline of the valve for linear motion. The movement form of the valve stem is lifting rod type (stem lifting, hand wheel not lifting), also has lifting and rotating rod type (handwheel and valve stem rotating together)Lift
The nut is located on the valve body.Corrugated pipe globe valve
Only applicable to fully open and fully closed, does not allow for adjustment and throttle.
The insulation stop valve belongs to forced seal typevalve
When the valve is closed, pressure must be applied to the valve so as to force the sealing surface not to leak. When the medium into the valve six from the bottom of the valve, the operating force required to overcome the resistance, is the stem and the packing friction and pressure generated by the media thrust force than the valve off the valve opening force, so the diameter of the valve stem, otherwise it will bend the stem top of the fault. In recent years, the emergence of self sealing valve, globe valve replaced by medium flow on the top of the valve into the valve chamber, then in the medium under pressure, the valve off a small force, and force open the valve, stem diameter can be reduced accordingly. At the same time, inmedium
Under the action, this form of valve is more stringent. China's valve "three to" has stipulated that the flow direction of the cut-off valve, all from top to bottom.
Insulating stop valveopen
When the opening height of the valve is 25% to 30% of the nominal diameter, the flow rate has reached the maximum,Express
The valve has reached full open position. So the full stop valve position should be determined by the valve stroke.
The types of LPG stop valves are divided into external thread type and internal thread type according to the thread position of the valve stem. According to the flow direction of the medium, there are straight through, DC and corner. The sealing valve is divided into sealing form, packing sealing stop valve and bellows sealing stop valve.
1, simple structure, manufacturing and maintenance is more convenient.
2, small working time, short opening and closing time.
3, good sealing, friction between the sealing surface is small, long life.
The disadvantages of the insulation stop valve are as follows:
1, the fluid resistance is large, opening and closing the greater force required.
2, it is not suitable for medium with large particles, high viscosity and easy coking.
3, poor regulation performance.
1, the handwheel, handle the operation of the globe valve can be installed in any position of the pipeline.
2. Handwheel, handle and steering 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 in the valve body.
Insulation valve, also called the door, is the most widely used as a valve, it is popular is because the process of opening and closing the sealing surface friction between the small, more durable, highly open small, easy manufacture, convenient maintenance, not only for low pressure, but also suitable for high pressure. Its closing principle is to rely on the valve bar pressure, so that the valve sealing surface and seat sealing surface close together, to prevent the circulation of media.
Insulation valve can only medium one-way flow direction when installing. Its structure length is larger than gate valve, at the same time, the fluid resistance is large, the long-term operation, the sealing reliability is not strong.
Heat preservation globe valve is divided into three types: straight through type, right angle type and DC type oblique stop valve.
When the stop valve is opened, the opening height of the valve is 25% to 30% of the nominal diameter, and the flow has reached the maximum, indicating that the valve has reached the full open position. So the full stop valve position should be determined by the valve stroke.