If it is necessary to quickly pump out contaminated water, craftsmen use drainage pumps. Models are divided into surface and submersible. The second option is preferable, since the engine is naturally cooled by the pumped medium. One of the popular types of submersible pumps is the Stavr unit. With optimal technical characteristics, it has a favorable cost.
Device and principle of operation
The main working units of the submersible pump:
- Electrical engine. It can be single-phase or three-phase.
- Impeller shaft. It is mounted separately from the engine or to it.
- Centrifugal pump with inlet pipe.
- Housing made of polymer or stainless steel. The first option is not reliable enough in terms of random mechanical influences.
- Float switch. Provides protection of the unit against dry running.
Do not confuse the drainage unit with fecal. The latter also has a special cutting knife for grinding biomass.
The submersible drainage pump Stavr works according to this principle:
- The device is immersed to a predetermined depth. Connect to the network.
- An electric motor comes into operation, which starts the rotation of the wheel shaft. The impeller starts rotation.
- When the blades move around them, rarefied air is formed, and the pressure in the chamber is significantly reduced.
- This contributes to the absorption of water and its further advancement to the outlet pipe under the influence of centrifugal force.
- As soon as the liquid level in the tank is reduced to a minimum, a float switch stops the pump.
Use drainage submersible units when draining flooded rooms, pumping water from ravines, filling containers for irrigation from a nearby pond.
The range of pumps Stavr
There are several modifications of the Stavr drainage units on the market. Each of them differs in technical characteristics. The device models are identical.
Pump Stavr NPD-400Sh
The body of the device is made of durable polymer. The unit is equipped with a float switch and an ergonomic handle for convenient transportation. Pump specifications:
- power - 400 W;
- maximum pressure - 1 atm .;
- ultimate immersion depth - 5 m;
- productivity - 50 l / min;
- allowable diameter of impurities - 0.5 mm;
- head - 10 m;
- maximum temperature of the pumped medium - +35 degrees;
- section of the outlet pipe - 25 mm.
The weight of the device is only 3.8 kg. The device is equipped with a 10 m cable. The factory warranty is 3 years.
Model NPD-450
The pump is designed to pump clean or contaminated water. The case of the device is plastic. The kit includes a coupling with adapters for connecting a hose. The technical parameters of the model are as follows:
- power - 450 W;
- maximum working pressure - 0.6 atm .;
- permissible immersion depth - 5 m;
- head - 6 m;
- section of the outlet pipe - 25 mm;
- productivity - 125 l / min;
- maximum temperature of the pumped water - +35 degrees;
- maximum size of trash impurities - 35 mm;
- cable length - 10 m;
- device weight - 3.5 kg.
The factory warranty for the pump is also 3 years.
Stavr PND-810M
The housing of this submersible pump is made of stainless steel. Like previous models, the PND-810 M is equipped with a polymer float switch. Other characteristics:
- power - 810 W;
- productivity - 242 l / min;
- maximum immersion depth - 8 m;
- working pressure - 0.9 atm .;
- head - 9 m;
- diameter of dirty particles - up to 35 mm;
- cable length - 10 m.
The weight of the pump is 4.9 kg.The device is covered by a factory warranty of 3 years.
PND-950
The model is available in black and gray. Working parameters:
- power - 950 W;
- productivity - 18 m3 / hour;
- head - 12 m;
- immersion depth - 5 m;
Like all other Stavr device options, this modification is subject to a 3 year factory warranty.
Model NPD-1100M
The most powerful model of the device, whose body is made of steel. Technical characteristics of PND-1100M:
- power - 1100 W;
- immersion depth - 8 m;
- maximum allowable pressure - 1 atm .;
- head - 10 m;
- productivity - 267 l / min;
- size of impurities - up to 35 mm;
- cable length - 10 m.
The weight of the pump is 5.7 kg. Warranty from the factory - 3 years.
Advantages and disadvantages
Stavr's pumps are appreciated by the craftsmen for such positive aspects:
- compactness, ease of installation;
- pump mobility;
- good performance for private farming;
- low noise level;
- economical consumption of electricity;
- profitable price.
Relative disadvantages include only the polymer case in some models. When working in difficult conditions, plastic may crack.
How to choose a model
The drainage submersible pump is selected according to the following criteria:
- Working conditions. Here you need to take into account the maximum possible temperature of the pumped water and the size of the impurities in it.
- Productivity The higher it is, the faster the pump pumps out dirty liquid, but will consume more energy. For people, the optimal power indicator is 1.5 kW.
- The pressure of the model. It is calculated by the formula: liquid lifting height x lead distance x 0.1 (coefficient). The height is taken as the difference between the point of the level of effluent discharge and the lower boundary of the submerged apparatus.
The maximum immersion depth of the device should also be taken into account.
Installation Features
Installation of the Stavr drainage pump should be carried out taking into account such rules and recommendations:
- The outlet hose must be secure. Otherwise, there is a high risk of sleeve failure under pressure.
- In the presence of a three-phase motor, the phases are connected in series, monitoring the direction of rotation of the impeller. If it rotates counterclockwise, the connection order of each phase should be changed.
- The pump is installed only vertically.
- Its launch is carried out exclusively in water.
To collect the liquid, you must immediately prepare a volumetric tank or organize a safe discharge place (ravine, country roads, etc.).
Reviews
Judging by the reviews of the Stavr submersible drainage pump, each of the models is recognized by the masters.
Anatoly, 41 years old. I bought a Stavr-450 pump for a summer house, because I often have to remove water from a basement flooded in spring (a summer house at the bottom of the village and near the river). The unit works well. I use it for the second year. Removes water to a level of 2 mm. We collect the rest with a scoop and a rag. Tip - it is better to use reinforced hoses for pumping dirty water.
Cyril, 31 years old. Pump Stavr PND-810 bought this summer. It was assumed that with the help of the device I will supply water from the rate for irrigation. The unit works reliably. The distance from the pond to the garden 7 meters overcomes easily. It doesn’t make much noise. I like everything for now.
