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Sight Glass is the device used to observe the material inside the container and equipment. It is a safety accessory and should be checked regularly. Divided into circular and rectangular Sight Glass by shape. Peeping and lighting Sight Glass s by use. By structure, it is divided into Sight Glass with lining and no lining, with neck, with cover, double layer safety, thermal insulation, with scraper, Sight Glass with flushing device, and Sight Glass suitable for powder materials.
Valve Sight Glass working principle and related knowledge: small installation size, and the drive moment is small, easy to operate, fast, and also has good flow adjustment function and close sealing characteristics, Sight Glass in the use of large and medium caliber, medium and low pressure field, it is the dominant Sight Glass form. Valve Sight Glass is divided into two categories: pipeline Sight Glass and equipment Sight Glass.
Use: Plastic Sight Glass can be used in chemical towers with high temperature, strong corrosion, easy poisoning, dangerous and easy to crystallize to ensure its safe production.
Structure: Sight Glass is mainly composed of Sight Glass bottom plate, Sight Glass, valve components, etc.
In the process of urea production, in the medium and low pressure tower with Sight Glass, due to the high working temperature, strong corrosive liquid characteristics, easy to cause liquid surface gauge Sight Glass damage, Sight Glass bottom plate deformation, and in the process of installing Sight Glass, sometimes due to uneven force, easy to cause PVC Sight Glass rupture. If it is not found in time, there will be leakage after driving, then the whole system must be stopped for hot washing replacement. This not only brings difficulties to the long-cycle safe operation of the system, but also seriously affects the efficiency of urea production.
According to the process of urea production "liquid affected by temperature easy crystallization" this characteristic, combined with all kinds of stop valve, insulation valve use characteristics, after long-term observation, exploration and thinking, designed the use of Sight Glass bottom for valve body, on the bottom, the inlet valve for control, Sight Glass level meter installed on Sight Glass bottom, through insulation steam insulation, to prevent liquid cooling crystallization forming false liquid level. The Sight Glass plate is welded to the tower container, using the heat of the tower body to increase the temperature of the Sight Glass plate, further prevent liquid crystallization. If the Sight Glass leakage or the PVDF Sight Glass is damaged, the valve on the bottom plate can be closed first, so that the Sight Glass can be replaced without parking, and can ensure the normal production, and the personal safety of the operators and the working environment safety is also guaranteed. The fertilizer fertilizer plant in the urea pre-distillation tower test, a success, filling the gap in the field of controllable insulation Sight Glass.
Thermal insulation Sight Glass: controllable thermal insulation Sight Glass has the following structural features:
⑴ J44W-220R DN15 high-pressure globe valve, cone seal and FE packing seal.
⑵ The valve cover is bolted to the valve body for easy disassembly and assembly.
⑶ The valve and stem are the overall structure, and the flow channel in the valve body is unobstructed to prevent false fluid level.
⑷ Integral valve body, double valve stem structure, reasonable external layout.
⑸ The valve body can be heat insulation steam, as a medium insulation, to prevent liquid crystallization.
⑹ The valve body is welded to the tower container, to raise the valve body temperature, and to prevent the liquid crystallization twice.
The action of valve: 1. Opening and closing action- -cut off or communicating the flow of fluid in the pipe; 2. Regulation effect- -regulating flow and flow rate in the pipe; 3. throttling- -reduces the fluid after passing through the valve; 4. Other functions- -a. Automatic opening and closing b. Maintain a certain pressure c. Steam drainage.
Types of valves: 1. By purpose: cut-off valve, regulating valve, shunt valve, check valve, safety valve; and Sight Glass class: * z1 i9 N: r'W%}!j. ~ 2. According to the force: active valve and automatic valve.
Main parameters of the valve: PN nominal pressure (the maximum pressure allowing the fluid to pass through); DN nominal diameter; TN temperature range (temperature range for fluid).
Inspection items include: 1. No sand holes and cracks exist on the inside and outside surface of the valve body; 2. Whether the valve seat and the valve body are firm, whether the valve stem is consistent with the valve seat, and whether the sealing surface is defective; 3. Whether the connection between the valve stem and the valve stem is flexible and reliable, whether the valve stem is bent, and whether the thread is damaged and corroded; 4. Whether the packing materials and gaskets are aging and damaged; 5. Whether the valve opening is flexible, etc.
Common problems: 1. Flange and thread leakage at the connection with the pipeline; 2. Filler culvert leakage, waist cushion leakage and valve stem opening; 3. Strict closing between valve core and valve seat to form internal leakage.
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August 02, 2022
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.