PTFE Packing
Description:It is braided with high purity PTFE (Teflon) filament. PTFE material has a low friction and excellent resistance to chemicals. PTFE Braided Packing is resilient, chemical resistant, self-lubricating, and withstand high linear speed and pressure with minimum wearing to the shaft. PTFE Packing can be used in various pumps and valves. It is especially good for corrosive media, high speed application, or applications that require clean and minimum contamination material.
Packings made from PTFE are a mainstay of the mechanical compression packing industry. PTFE is well known for its outstanding resistance to chemical attack, low coefficient of friction and wide temperature tolerance including cryogenic service. This wide flexibility makes PTFE packings a popular choice for those difficult applications where strong solvents, corrosive chemicals and oxidising media require to be sealed. Style options:
Technical Data
Material
100% Pure PTFE yarn
Temperature Range
-150 up to +260 oC
Process
Rotating
15 bar
Reciprocating
100 bar
Static
150 bar
Shaft Speed
2m/s
PH
0~14
Density
1.3g/cm3
Ptfe Packing,Ptfe Gland Packing,White Ptfe Gland Packing,Ptfe Packing For Sealing HEBEI HENGDA SEALING MATERIALS CO.,LTD. , https://www.hengdasealing.com
The metering accuracy and quality level of the water meter's base meter are improved, and the metering problem of the base meter has been reduced accordingly. The inspection personnel of the domestic smart meter professional production plant and smart meter have been improved. having lots of experience. The inspection and testing of the base meter (with reducer, valve, movement, counter) is extremely important, and the main item of inspection is the basic error. Second, the smart meter controller. Its technical requirements are 12 items, mainly for the controller, in essence, the requirements of the whole machine: such as high temperature, low temperature, damp heat, vibration, electromagnetic, electrostatic discharge, static magnetic field, power supply changes, mechanical shock, short time power drop , surges and bursts.
At present, the measurement and inspection of these projects is a weak link in the national water meter industry and has been gradually improved in recent years. The last is the valve of the smart meter, and the commonly used valve is selected as the electronically controlled valve. This electronically controlled valve is the actuator that performs the flow closing and opening of the water meter. The main reason is that the electronic control operation margin and durability are better. Specifically, it can work normally under 0.02 MPa to 1.0 MPa water pressure. After closing and opening operation 1000 times, it can still work normally. The leakage amount should be within the allowable range, and the average MTBF of the controller should not be less than 4000 hours. At present, there are roughly three types of electronically controlled valves for the domestic smart water meters. Considering the water quality of the pipe network, the damage to the valve of the water meter is serious and directly affects the metering of the water meter. The selection of the electronically controlled valve must have a long service life, high reliability of the switch, low pressure loss, and it is not easy to scale during use. At present, the largest number of ball valves is used, followed by solenoid valves and ceramic valves. The structure of the ball valve is also different. The key problem is that the action must be reliable, and no leakage occurs when the valve is closed. The power consumption is small. The power consumption problem is the focus of the difficulty of the valve, and it is a comprehensive indicator of smart meter actions and leakage.
The installation of water meter installation meters is directly related to the future meter reading and maintenance of water meters.
1. The new water meter meets the requirements of the straight pipe section (10D before the table, 5D after the table, and D is the nominal diameter of the water meter). If it is really impossible to reach the requirements of straight sections before and after the water meter, rectifiers shall be installed in front of the watch to reform the old water meter.
2. According to regulations, the water meter should be installed and used horizontally. However, in the actual online water meter, there are many horizontal and vertical tilting phenomenon of the water meter.
According to the error caused by the tilt of the DN15 rotor type water table, the error at a small flow rate of 90 degrees laterally can reach 6 times the normal error, and the vertical tilt error can reach 10 times. At a large flow rate, the vertical and horizontal tilt can be 90 degrees. Reaching an error of 1 times, both the small flow and the large flow are negative errors, that is, the slower the slower the flow.
In summary, in the installation of water meter or daily water meter replacement and maintenance, must pay attention to the water meter is upright, to maintain the level, especially for the flange installation of water meter can not be due to inconsistencies in the eyes or fittings do not fit, because the flange connections are large For large-diameter water meters, the losses due to errors will be even greater. For some sporadic rural users, consider using a vertical meter.
Remote meter reading fault check
Summary In addition to the above issues, there are many issues worth investigating in meter management. At present, many water meter manufacturers promote smart water meters. However, due to the complicated wiring of smart water meter systems, unstable data transmission performance, and being susceptible to external interference, daily maintenance of water supply department users has added many difficulties. How to truly solve the practical problems of users from the initial installation to the later maintenance is everyone's need to think together.
(Original title: Meter Management)
Do you know all these basic skills for increasingly strict meter management requirements?
According to the deepening of the national energy conservation and environmental protection policy, the continuous increase in sewage charges and water prices, and the development of direct copying in rural areas, the problems associated with the measurement of water meters will become more pronounced, and the requirements for the measurement and management of water companies will be met. higher. Water metering management includes water meter installation, verification and replacement, troubleshooting and water meter selection, online management and many other aspects. Today we mainly talk about water meter installation, testing, and remote meter reading troubleshooting.