Questions and answers about metering pump auxiliary equipment

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　　What is the main purpose of the bottom valve?

　　The bottom valve itself has a certain weight to keep the suction line straight and make the suction line perpendicular to the chemical tank. In addition, it is also a check valve to keep the chemical liquid flowing forward. The bottom valve also helps to improve pump repeatability and normal suction. There is a filter in the bottom valve to prevent solid particles from being sucked into the suction line. Inhalation of small solid particles may cause the metering pump diaphragm to break. The bottom valve also includes a connecting piece for connecting the suction pipe. The bottom valve should be installed vertically and keep the bottom valve at a certain distance from the bottom of the tank. It is very necessary to choose the bottom valve of most metering pumps that work by self-priming .

　　What is the main purpose of the injection valve?

　　The injection valve is used to connect the discharge line and the injection point. The injection valve cannot be used as an isolation device or as a protection against siphoning. In occasions where the requirements are not too high, the injection valve can generate a back pressure of 0.5 bar.

　　What is the main purpose of flushing equipment?

　　Flushing equipment is used to clean the pump head and drain line of the metering pump . It is mainly used when the metered chemicals are easy to solidify or the metering pump needs to be in an idle state frequently.

　　What is a float switch and what is its main function?

　　The float switch is a very critical device for controlling the liquid level of the storage tank. When the liquid level drops, the float sinks and the contact in the switch is closed. This contact can be used to control the metering pump , for example, stop metering pump 1 and start metering pump 2, or it can be used to turn on the alarm/indicator to indicate the medicine tank air. Through the reverse action of the float, the float switch can be applied to the collecting tank, indicating that the collecting tank is full and stopping the metering pump.

　　What is the difference between a single-stage float switch and a two-stage float switch?

　　When the switch is activated, the single-stage float switch directly stops the metering pump . For the two-stage float switch, when the first stage is activated, it can be used to alarm and indicate the low level of the tank. When the second stage switch is activated, the metering pump stops.

　　What is a multi-function valve?

　　Multi-function valve is a very versatile product, it can generate a constant back pressure to ensure repeated metering accuracy. The device integrates the function of an anti-siphon valve, which can prevent chemicals from being sucked into the vacuum pipeline and prevent the Venturi effect or negative delivery pressure in the waterway. The pressure relief valve function is integrated in the equipment, which can protect metering pumps, pipelines and other system equipment when the system pipeline is blocked to prevent overpressure work. The multi-function valve is also integrated with the function of an inducing valve, which can release the pressure of the discharge line and help the metering pump to introduce liquid. The multifunctional valve can safely return the discharged liquid to the medicine tank.

　　What is the main purpose of the pulsation damper?

　　Choosing a pulsation damper of an appropriate size can reduce the pulsation by 90% or more, resulting in a flow close to laminar flow. The pulse damper reduces the acceleration of the medium to be measured and reduces the head loss.

　　What is the difference between the function of a buffer and a pulsation damper?

　　The buffer can reduce the pulsation of the pipeline, while reducing the acceleration of the medium and reducing the head loss. There is no separation of liquid and gas inside the buffer. The inner cavity of the buffer will eventually be filled with liquid, and the liquid needs to be drained.

　　Can multiple metering pumps be connected to a water meter?

　　We do not recommend directly connecting multiple metering pumps to a water meter. The safest way to connect multiple metering pumps to a water meter is to use the synchronous relay function. The metering pumps should be connected in series.

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