Metering pumpHighly accurate and beneficial equipment that assists manufacturing departments in mixing, purifying and controlling fluid operations and applications. Pairing metering pumps with accessories can improve their metering accuracy and reliability, prevent offline problems, and reduce maintenance costs.
Each different component is designed to take an existing function and improve it in order to add to make the final process of the metering pump better. Most stoichiometric systems benefit from a combination of accessories, whether they are relief valves, back pressure valves, calibration cylinders, pulsation dampers, pressure gauges, injection bushings or filters.
Pressure relief valve
If the discharge side of the pump is blocked while the pump is running, the pressure in the pump will continue to increase until something breaks. In these cases, the safety valve releases excess pressure and prevents damage to the pump, piping, and other components.
Back pressure valve
The back pressure valve is usually placed near the discharge side of the pump to ensure that the pressure is maintained on the discharge side so that the pressure inside the pump seat can be properly checked. When the set pressure is reached, the valve releases the fluid, optimizing pump function as well as flow in the pipeline.
The function of the back pressure valve is to maintain the pressure when the suction pressure is greater than the discharge pressure. Without a back pressure valve, the metering pump may overdeliver and be inaccurate. The back pressure valve is located on the discharge line near the metering pump and applies sufficient pressure to overcome the inertia of the discharge fluid.
Injection tube
The injection tube has a built-in check valve to ensure that the chemicals being measured do not backflow. They are designed to inject chemicals into the center of the stream in order to achieve uniform dispersion and uniform mixing of chemicals. The injection sleeve includes flow calculation to determine the natural frequency. Those with inclined ends provide better dispersion and reduce the likelihood of corrosion or scaling of concentrated chemical injectors.
Anti-siphon check Valve (ASV)
An anti-siphon check valve is a built-in back pressure valve and check valve that prevents siphoning, a problem where fluid continues to flow and is sucked out after the pump has stopped. This happens because the pressure on the discharge side of the pump is lower than the suction side. In addition, anti-siphon check valves prevent excessive feed and backflow in the main line.
Air chamber
An air chamber is a vibration or pulsation damping device that reduces the pulsation produced by a reciprocating pump and contributes to a stable liquid flow. When the air in the chamber is released, it reduces the pulsation in the pipe caused by the movement of the reciprocating metering pump.
The air chamber works with the throttle valve, and the liquid passes through the throttle after leaving the air chamber. The accumulation of liquid in the air chamber is proportional to the pressure loss of the air pressure.
Pulsation damping device
The pulsation damper has the same function as the air chamber and is designed to suppress pulsation and vibration caused by the metering pump. When the fluid is expelled, it enters the damper, compressing the airbag or diaphragm to eliminate vibration in the system. They ensure smooth and continuous flow in the system. Pulsation dampers can be used on all types of metering pumps, regardless of their design.
Calibration cylinder
Given fluid viscosity conditions, the position of the pump relative to the fluid source, and the amount of wear on the pump assembly, the calibration cylinder provides an accurate flow rate reading. They are installed on the suction side of the pump, where the descent of the column can be timed to calculate the flow rate to ensure the correct dose. Calibration is performed when fluid characteristics change or any time the operation of the pump changes.
Pressure gauge
As with all pumps, pressure gauges are designed to measure liquid pressure and ensure that it is within a specified range. The pressure gauge is a safety device used to protect the pump system and may explode if the proper pressure is exceeded.
The spring of the pressure gauge responds to compression or expansion to provide a reading that complies with Hukri's law. Modern pressure gauges are digital and provide digital readings. They are fully automated and provide readings that can be sent to a laptop or desktop computer.
Metering pump filter
Filters for metering pumps have the same function as filters for all other applications, namely removing particles and debris that can interfere with pump operation. For metering pumps, the filter is placed before the suction side of the pipe. They are especially important when extracting material from storage tanks, vats, or the tops of containers, where debris may be collected or trapped.
Filters can be used to screen out impurities in the fluid or when contaminants may be present that will degrade pump performance. The most common form of filter is the Y configuration.
Exhaust valve
Degassing valves remove dissolved oxygen, carbon dioxide, and other forms of gas from the flow. The gas trapped in the connector is discharged back to the supply tank. They must be installed at the highest point of the piping system to ensure that the gas will not be trapped and cause gas blockage. The degassing joint ensures the proper performance of the valve system and metering pump.
Chemical doses Use chemicals that produce gases, including sodium hypochlorite, hydrogen peroxide, or sulfuric acid. Through movement or compression, the chemical releases steam that needs to be expelled.
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