a. The backwash filter adopts multiple filter cartridges for filtration, with large effective filtration area and small pressure loss. The designed filtering area is 3 ~ 5 times of the inlet and outlet area b. Convenient repair and maintenance: the manhole is set for easy loading and unloading of the filter cartridge, and the backwash filter does not need special tools c. The structure of multi filter cartridge filtration and filter cartridge cleaning one by one is adopted, and the water supply is uninterrupted during cleaning d. Program control: various parameters of the system can be set according to the actual situation of the user e. Advanced control system: the control system has high accuracy and can adjust its working mode and operation state according to different water quality to improve its ability to adapt to water quality f. Convenient control mode: differential pressure / time can be controlled at the same time or separately, which can be selected arbitrarily according to the actual working conditions and needs, and operate automatically; At the same time, manual / automatic transfer switch is set, the control mode can be preset, and electrical interlocking can be realized, which is stable and reliable g. Local control is set, and remote control transfer switch can be set if necessary to realize local operation and remote control operation h. The backwash filter has the functions of operation status output and fault alarm output to ensure that the equipment can operate under safe and reliable conditions

Operating principle and features      LTCY-Z type under can sampler differences to traditional samplers: sampling support tubes are matrix strengthen equipments which can greatly improve the relative steel performance and reduce the weight of the inner parts as well as the pulling to the floating plate.      Feature one: The inner components weight is small and the pulling to floating plate is no more than 20Kg, the horizontal pulling is no more than 10Kg.      Feature two: the sampling supports adopt strengthening technology.      Feature three: the top, middle and bottom sampling points will change with the liquid level under 1/6 above, 1/2, 1/6 proportion.      Feature four: the sampling tube diameter can elevate to DN15.      Feature five: the sampling height can be within 2~4 meters, the difference can be 5% of the SH/T3414-1999 principle. Based on the above items, we do some improving which can make it more reliable, safety and so on.  

Operational principle and features      LTCY-F type under can sampler adopts bowl vertical structure and it mainly be used in vault tank, especially, the tank diameter is small with much heat and it requires for the tense installation place.      Top, middle, down sampling tube mouth and the top and middle sampling ball will float with 1/6, 1/2, 1/6 proportion, and the sampling should be according to the rules of “ Liquid petroleum products manpower sampling”.      Feature One: the maximum down pulling should be less than 10Kg, leveling pulling should be less than 0.5Kg,     Feature Two: more accurate.     Feature three: tense structure and it covers small area. Feature four: simple structure and it is easy to install and maintain.  

Operating principle and features       LTCY-L type product adopts vertical tube fixed point sampler and the inner diameter is φ 6-φ 8mm samplers with diameter φ 45¡& laquo;& phi; 76mm support tubes inside.     According to the height of the highest liquid, every meter should be one sampling point and at the bottom, another one should be here to get pure samples      Meet GB/T4756-1998 , No.8.2.2 principle: If the difference between density is larger than 0.0012g/cm3 (transparent,low viscosity),or larger than 0.0015  g/cm3(fuel oil) samples should be got every meter   as well as the moisture is 0-0.1%.  

Operating principle and features     LTCY-X type based on the floating power pulling, the reams connected to “ X” components and which make the sampling mouth liquid level change with 1/6É& Iuml;, 1/2, 1/6 proportion.   For the “ X” components are all the same and the sampling mouth with liquid level is rather precision which can guarantee the 2 meters above precision can be 100%.     The floating plate pulling should be less than 30Kg without horizontal pulling which can make sure the plate is safe and the installation is rather simple.

Floating ball check valve is an important accessory in the drainage system of large floating roof oil tank. It is a special valve for the drainage device of oil tank floating roof. It is widely used in floating roof tanks in oil fields, large crude oil depots and refineriesThe floating ball check valve is installed on the side wall of the floating roof ponding pit and connected with the central drainage pipe. When rainwater accumulates in the ponding pit, the floating ball valve automatically opens to make water flow into the central drainage pipe and drain the rainwater on the floating roof. In case of floating obstacles on the floating roof, in order to prevent the oil in the oil tank from flowing back to the tank roof through the central drainage pipe, the floating ball in the floating ball valve will automatically close the floating ball valve under the buoyancy of the oil in the tank to prevent the oil from overflowing to the tank roofThe floating ball check valve completely overcomes the disadvantages of swing check valve. At the same time, the utility model has the advantages of simple structure and convenient maintenance, and can check and replace vulnerable parts at any time under the working state

Emergency drainage device is an important accessory on the floating roof of large floating roof oil tank. Generally, rainwater is discharged from the tank through the central drainage pipe. However, when the central drainage pipe is blocked or oil leakage cannot be used, the accumulated water on the floating roof cannot be discharged; In addition, during the current rainstorm, due to the large rainfall, the drainage capacity of the central drainage pipe is limited, and the ponding cannot be discharged in time. In the above two cases, ship sinking accidents are easy to occurThe emergency drainage device is mainly composed of filter water collecting cover, sealing system, float, drainage pipe and water sealing groove. When the accumulated water exceeds the bearing design of the floating roof, the overloaded accumulated water flows into the drainage pipe of the emergency drainage device through the filter screen, and the float is turned over by using the impact force of water, so that the device enters the emergency drainage state to avoid the occurrence of shipwreck. The design drainage of the unit is 40-50m³/ h。 The float is OCr18Ni9 stainless steel hollow round sphereWhen no water is discharged from the floating roof, the float floats horizontally in the drainage pipe to cover the water seal liquid level to prevent water evaporation. Since the device adopts natural precipitation collection measures, it is unnecessary to add water to the drainage pipe regularly under normal operationThe emergency drainage device made by our company can not only remove the overload ponding, but also prevent the backflow of liquid storage. At the same time, it also has the function of reducing the water loss of water seal and collecting precipitation, which is convenient for operation and management

The automatic vent valve is one of the important accessories of the outer floating roof tank, which is mainly to prevent the formation of overpressure or vacuum in the floating plate during the operation of the floating plate, thereby damaging the floating plate