Pump Selection

When selecting the type and size of the KUPAR GEAR PUMPS there are some criterions, which are generally summarized below. Please contact us for detailed information and selecting criterions.

The most important criterion when selecting gear pumps is the viscosity. Viscosity is important when selecting the type and size, also selecting the pump speed and designing clearances. There are 4 important criterions of pump selection such as:

Pump Type: the main principle is to select the helical gear pumps for low viscosities and internal gear pumps for high viscosities.

Size of The Ports: Size of the ports and pipes is again related to the viscosity of the fl uid. Every size of the port and pipe has a capacity of flow rate of fluid according to the viscosity. When selecting pump size and designing the pipe system, the diameter should be calculated accurately or you must be contented with the maximum flow rate for that viscosity.

Pump Speed: the maximum speed for gear pumps 1500 rpm speed should be reduced according to increasing viscosity. High speeds should be selected for low viscosities, low speeds should be selected for high viscosities. Direct coupling to electric motor is used for 1000 and 1500 rpm. 500 and lower speeds coupling to electric motor with V-belt and direct drive to reduction unit is used.

Working Clearances: some working clearances are machined during production and some clearances are adjusted during assembly according to the viscosity ranges. Every pump should be used to transfer the fl uid, which has the suitable viscosity, for its working clearances. Otherwise the pump can operate with lower pressure than indicated before or the pump can operate very hard or fully stop..

Applications

KUPAR GEAR PUMPS are used to transfer liquids, which is more viscous than water, from place to place. These fl uids should be chemically lubricating and should create a fi lm between friction surfaces to minimize the wear..

 

 

Frequently Asked Questions

What we can do is leaking from packing? (Soft seal types)     
Reason: The gland may be loose, tighten the bolt seal pressure. Leaking stuffing box does not prevent entirely. 1 to 2 drops per hour can leak, so you too much tightening, excessive tightening compressing the seal makes it difficult to turn the shaft and both cause burns from hot seal. Zero should be used if desired mechanical seal leakage.


The pump does not provide the specified flow rate and pressure, working at a lower value of the catalog value what should be done?
Reason 1: The pump suction and / or pressure lines should be checked, smaller diameter pipe from the pump input and output diameter should be used. The material can be fully confident that the pump should be ensured. Suction line on the pipeline should be checked for any place there is any space where air pumps should be checked carefully.

Reason 2: By-pass models with by-pass pressure setting installation values ​​can discharge a portion of the suction line is not suitable to pump on and off a number of by-pass during the study material so achieved and desired flow can not reach the pressure value as well as the stated pump.
In this case, the by-pass setting (see. Section III) should be set according to the value system pressure.

Reason 3: pump working space is set according to the value specified viscosity when selecting the pump.
The higher viscosity comfortable working without jamming the pump works by increasing the space provided. If it works, the pump is designed for low viscosity, high viscosity may not provide the desired flow rate and pressure, even when used at low speed in selected high viscosity pump for low viscosity materials and complete stop jamming may occur


Pump polyphonic works what should be done?
Reason 1: Gear pumps suction and / or work, I find it hard to push too loud. So the suction and / or pressure pipe or hose must be smaller than the diameter of the pump port. Suitable hose should be sure to select (contracts in the normal plastic hose suction line so the suction hose that steel spiral wire hose should be used.) The clear and clean flow on either line is not clogged something in the mouth should be checked to be smooth and comfortable.


What causes the pump to stop working suddenly?
Reason 1: Power failure has occurred. Installation should be controlled electrical motor or gearbox should be checked against electrical faults.

Reason 2: Gear pumps for solid particles certainly can not accept, can cause the pump to stop even a small piece stuck.
If such a failure occurred before the pump should be stopped immediately, cover the pump must be removed after the power fails. Entering into the part to be removed, the shaft or damage to the gear should be checked, cleaned if done burrs. Once the cover is installed correctly, the pump can be started again. Cover attention should be paid to inserting direction. cover the internal gear pump and marks on the body must be installed to meet each other. Helix does not matter the direction of the gear pump cover.

Reason 3: pump working space is set according to the value specified viscosity when selecting the pump.
The higher viscosity comfortable working without jamming the pump works by increasing the space provided. If it works, the pump is designed for low viscosity, high viscosity may not provide the desired flow rate and pressure, the selected pump high viscosity materials used for low viscosity, low speed compression and even stop completely


The pump is running for the first time, what could be the reason it does not suck?
Reason: In this case, the pressure line into the pump Pour 1 quantity of oil so that it would no longer bleed both lean and by enabling them to pump vacuum pump. Despite 3 - 5 minutes after stop immediately the pump still does not start transfer fluid. Check the following elements.

1.Pomp to make sure that the air suction on the suction line from any point affects the small air suction hole. Check that the
2.Em the pipe is immersed in the liquid state,
3.Em the absorption cross section may be too high or too tight.
4.Malz power of the pump is too strict may not be sufficient to absorb.

 

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