General partner and Service center of the company
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Distributor (authorized representative) to supply piston pumps to industrial enterprises of Russia, Ukraine, Kazakhstan and Uzbekistan

The Russian company ООО «ЭНЦЕ Инжиниринг» (ENCE Engineering) is a general partner and a service center of a Swiss production and engineering company ENCE GmbH (ЭНЦЕ ГмбХ). The headquarters of ENCE GmbH (ЭНЦЕ ГмбХ) was founded in 1999 and has now a wide technical staff in pumps and other process equipment.

ООО «ЭНЦЕ Инжиниринг» (ENCE Engineering) together with the headquarters ENCE GmbH (ЭНЦЕ ГмбХ) is in a position to supply piston pumps, perform service activities including supervision, startup and commissioning, after sales and post warranty maintenance, through our own resources, and also involving a wide network of our representative offices in CIS-countries.

Baltic states: Lithuania, Latvia

The Russian company ООО «ЭНЦЕ Инжиниринг» (ENCE Engineering) is an official representative of pump manufacturers such as:
Shin Nippon Machinery (Japan),
Sundstrand Corporation (the USA),
Oilgear (the USA),
Teikoku Electric (Japan),
HAUKE-MP GmbH (Austria)

Together with the headquarters, ООО «ЭНЦЕ Инжиниринг» (ENCE Engineering) performs supplies of piston pumps to the following industrial enterprises in CIS-countries:
Pump supplies for the last 5 years

General information about piston pumps

Pump description

Piston pump is a type of pumping units where a displacer forces the liquid out of static working chambers. A piston pump working chamber is closed space sequentially communicating with pump inlet/outlet.

Piston pumps energize the pumped fluid transforming it from mechanical motor power, that is this pump type energizes the pumped medium enabling it to overcome resistance, inertia and static height in the pipelines.

There are various piston pump classifications displaying construction features of piston pumps, their performance peculiarities, compatible operating liquid, working device speed rate and produced operating pressure.

Piston pumps variety and types

Piston pumps can have both hand and mechanical drive. Pumps with mechanical drive can be of two types:

  • Driven pumps with the piston actuated by crank and connecting-rod assembly from the motor arranged separately and connected to the pump via transmission;
  • Direct acting pumps with reciprocating motion of the piston by means of the pump rod directly from the piston of a non-crank steam engine which is an ingrate system with the pumping unit.

By the type of a working device displacing the liquid, piston pumps can be of:

  • Piston type (the piston is of a disc shape);
  • Plunger type (the piston is of a cylindrical shape);
  • Membrane type (operating liquid is separated from the piston by a special membrane and the cylinder accommodates oil/emulsion). These pumps are used to pump liquids containing various admixtures, chemically aggressive liquids, mortars. The membrane can be activated by a simple lever. Working chamber is equipped with two pipes, one is suction, the other is discharge. The rod moves reciprocating and connects with the membrane. Membrane pumps are used as a part of automobile engines as fuel pumps.

By course of action, piston pumps can be:

  • Single action piston pumps;
  • Double action piston pumps. These pumps pump liquid more uniformly in comparison to pumps of single and of differential actions as it is equipped with two working chambers located on both sides of a cylinder where discharge and suction valves are installed. Due to this the piston forces the liquid twice while the crankshaft makes one turn. Pressure dome connected with the pipe reduces the pumped liquid pulsation significantly;
  • Differential piston pumps. These are bidirectional pumps with two working chambers: one chamber has no valves, other chamber has a suction valve and a service valve. Pump liquid is discharged by the pump twice for each shaft rotation; as a result, liquid delivery becomes significantly uniform.

Piston pumps are classified by cylinder position (horizontal and vertical) and by number of cylinders (pumps with one, two, three or more cylinders).

By the number of pistons, pumps are classified as those with one, two or more pistons. Also, by the discharge amount, pumps are classified as those with large pistons (with the diameter more than 150 mm), medium-size pistons (with the diameter 50 mm to 50 mm) and small-size pistons (with the diameter less than 50 mm). By the operating element speed, pumps are classified into three types: slow piston pumps (40 to 80 double strokes per minute), moderate-speed piston pumps (50 to 80) and high-speed piston pumps (150 to 350).

This type of pumps is applied to move cold water (common pumps), hot water (hot pump), to process acidic substances (acid pumps) or mud solutions (mud pumps), etc.

By the operating pressure level, pumps are classified into those producing high, moderate and low pressure.

By the main component movement style, piston pumps are classified as direct-acting pumps and power pumps. In direct-acting pumps, the main component movements are reciprocating; in power pumps (e.g. cam-driven pumps), the main component rotates.

Cam-driven and submersible pumps are widely applied.

For example, cam-driven pumps have a single cylinder, with the operating element activated by a cam and returned to its home position by a spring. In these pumps, liquid discharge is non-uniform; however, their design is small-sized. In cam-driven pumps, cylinders are installed radially, and axes are crossed in a common center. Shoes are used to reduce contact pressure between the displacer and the cam. Cam-driven pumps are capable to produce high pressure; so, they are used in hydraulic drives, for liquid injection in hydraulic presses and as fuel pumps in diesel engines.

Submersible pumps are very small and are used at boreholes.

Piston pumps: basic components and parts

Piston pumps comprise one of types of volumetric units, with displacers used to push liquid from static working chambers. The basic components of a piston pump are the working chamber and a displacer. For volumetric pumping equipment, the working chamber is the enclosed space alternately connected with the pumping plant inlet and outlet. The displacer is an operating element that displaces substance from the unit’s working chambers.

Piston pumps: operation principle

In single-action piston pumps, the rod connects the displacer with the crank gear; as a result, the displacer reciprocates in the cylinder. When the piston travels right, vacuum is produced in the working chamber. As a result, operating liquid is suctioned by the valve through the pipeline into the chamber. When the piston travels back (left), the discharge valve is open and the suction valve is closed. As a result, liquid is injected into the discharge pipeline. To increase efficiency of piston pumps, they are often made as double, triple pumps, etc. The single crankshaft is used in these pumps to activate pistons.

Piston pumps: advantages

The advantages of piston pumps, as compared with other types of pumping plants, are as follows:

  • liquid discharge does not depend on the head; as a result, these pumps are applicable as metering pumps;
  • relatively high efficiency (for example, it is higher than the efficiency of centrifugal units);
  • low speed.

Liquid delivery provided by piston pumps is not uniform, and the dimensions of these pumps are quite large (for example, larger than the dimensions of centrifugal pumps). Their design is complex; however, they are capable to produce high heads. Piston pumps are used for operation with clean liquids, because these pumps have valves. Admixtures in operating liquid can result in pump failure.

Piston pumps: application in industry

Piston pumps are actively used in water supply systems, in household equipment, in food industry, chemical industry, and for making the material deposition equipment. Some types of piston pumps, such as diaphragm units, are used as components of internal combustion motors for fuel delivery; also, they are used for operations with mortars and other substances containing admixtures. Submersible pumps are widely used for works carried out at boreholes. Mud pumps are used to move mud solutions.

The Russian company ООО «ЭНЦЕ Инжиниринг» (ENCE Engineering) is happy to collaborate with both large ambitious pump manufacturers and fast-growing companies in search for new trade areas for their products.

Our group of companies totals around 200 employees and we are ready to become a distributor for those manufacturers whose strategy is oriented to improve long-term competitive position at Russian and CIS-markets.

We are always open to consider any partnership proposals!

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