Compressors

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Gardner Denver is a global leader in the design, manufacture, installation and service of innovative compressor technologies for a diverse range of industries.

From manufacturing to construction, mining to pharmaceuticals, our compressors work hard to increase efficiency, reduce energy consumption and decrease cost of ownership for compressed air users across the globe.

Gardner Denver has been in business since 1859, with over 100 years of experience in manufacturing air compressors. Today we provide compressors to meet a wide range of customer requirements – from small, stand-alone compressors, to complete compressed air systems including compressor sequencers, remote monitoring, air treatment and other ancillary equipment.

Articulated Piston

The articulated piston compressor utilizes the same operating principle as a conventional car engine piston. The articulated piston transfers rotational energy from a motor pulley into a reciprocating motion used to compress air in a cylinder.

As the piston moves down inside the cylinder, air is drawn in through a one-way intake valve. On the upward stroke, this air is exhausted through a one-way exhaust valve. Sealing of the piston to the cylinder is achieved by using two piston rings each backed with a spring to keep them in contact with the cylinder wall. A piston skirt is also used to guide the piston in the cylinder.

Centrifugal

Centrifugal Technology is a constant pressure variable flow aerodynamic compression of air or gas where flow is proportional to power consumption. The centrifugal technology achieves a pressure rise by adding kinetic-energy/velocity to a continuous flow of air through the rotor or impeller. This kinetic energy is then converted to an increase in static pressure by slowing the flow through a diffuser. This technology is used in many different blower and compressor products such as; centrifugal compressors and fans as well as centrifugal multistage blowers to name a few.

Claw

Dry running claws generate contact free vacuum or compressed air efficiently and economically. This technology is used in claw pumps, claw vacuums and claw compressors among other machines. They offer process-safe and reliable operation at fairly low noise levels. Typical applications can be found in wood processing, wastewater treatment and the packaging and printing industries. They are also commonly used in pneumatic conveying and central vacuum systems.

Claw pumps consists of two rotors. They turn in opposite directions without contact. As the claw moves over the suction connection and the axial suction channel inlet the gas is sucked into the compression chamber.

As the rotors revolve, the gas moves from the suction side to the pressure side. Then it is compressed by the reduction of the volume between the rotors until the lower rotor uncovers the discharge channel. This “internal compression” leads to high differential pressures at efficiencies of more than 60%. Afterwards the pre-compressed gas is discharged via the pressure connection. To remove the heat generated by the compression process, cooling air is sucked in between the compression housing and a silencing cover before it leaves the pump.

Diaphragm

Gardner Denver’s innovative Diaphragm Pump Technology has been providing outstanding value in the pumping, compression industry for over 50 years. Our world class engineering team designs application specific diaphragm pumps that boast extremely high levels of quality and reliability in the business. If you have a need, large or small, Gardner Denver has a solution.  Select from the list of Brands below to find out more

Gear

Gear pumps use the meshing of gears to produce flow through means of displacement. They excel at efficiently pumping high viscosity liquids, such as asphalt, adhesives, and other chemicals.

Gear pumps can be classified as either internal gear pumps or external gear pumps and represent one branch of positive displacement pumps.

Liquid Ring

Liquid ring pumps and compressors utilize rotating positive displacement technology and are typically used in liquid ring vacuum pump applications, but can also be used as a gas, or liquid ring compressor. These sturdy pumps are built for heavy duty, wet and humid applications where most other pumps' performance will drop due to abrasion and lime scale from the process. The larger liquid ring pumps are often part of engineered systems designed to meet even the highest demands.

This is how they work: the impeller rotates friction free within the pump casing. A rotating liquid ring seals the impeller on the front and seals its blades against one another. In order to keep the liquid ring stable, liquid is also permanently sucked into the compression chamber and is output together with the conveyed gas. The excentrical arrangement of the impeller within the casing creates variable compression chambers between the impeller blades during rotation, which causes the conveyed gas to be compressed within a full revolution.

Oil Free

Oil-free and oil-less technology are used in a variety of applications across the globe. Hospitals, pharmaceuticals, the food industry, among many others depend on Gardner Denver to provide the cleanest, oil-free air for their systems and processes.

In a lubricated machine oil is used to seal, lubricate and cool, however this then leaves high oil content in the compressed air that has to be removed. Oil free compressor, or oil less compressors, use an alternative medium such as water to seal, lubricate and cool, or compression takes place in multiple stages, the compressor then delivers the highest quality air without the need for separation and filtration. The types of technologies used in oil free compressors include, Water Injected compressors, two stage dry screws, single or two stage oil free pistons or centrifugal compressors.

Gardner Denver offers a wide variety of oil-free and oil-less technologies including a two stage dry screw capable of pressures over 150 psig and a water injected single screw compression element that provides a system package 100% free of oil, completely eliminating the possibility of oil contaminating the system. This technology makes Gardner Denver an industry leader in providing oil free compressed air. In an oil-free machine, the air is compressed entirely through the action of the screws, without the assistance of an oil seal. They usually have lower maximum discharge pressure capability as a result. However, multi-stage oil-free machines, the air is compressed by several sets of screws. Oil-free machines are used in applications where entrained oil carry-over is not acceptable.

Positive Displacement

Positive displacement compressors take advantage of positive displacement technology; which causes movement by trapping a fixed amount of air then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement technology can be further classified according to the mechanism used to move air.

Radial

Radial fans, also known as radial blowers or radial compressors, are a reliable, compact and safe technology for vacuum and pressure. They come as single- stage and multi-stage versions. Typical applications include packaging and paper handling.

Operating principle: as the impeller rotates, the air in the blade chamber of the impeller is centrifugally moved outward and exits at the edge of the impeller. This creates negative pressure at the hub of the impeller causing air to be sucked in. The incoming air is deflected from an axial into a radial direction as it enters the blade chambers. Due to the high speed of the impeller, the air flows outward into the spiral housing. At this point the velocity is reduced and part of the energy is transformed into compression energy. The air then exits through the outlet of the blower.

Reciprocating

Both a reciprocating compressor and a reciprocating pump use the operating principle of reciprocating technology. This technology is a piston moving forward in a cylinder via a connecting rod and crankshaft. If only one side of the piston is used for compression, it is described as single acting. If both sides of the piston, top and underside are employed, it is double acting. The versatility of the piston compressors knows virtually no limits. It compresses both air and gases with very little alterations and is the only design capable of compressing air and gas to high pressures.

The configuration of a piston compressor can be a single cylinder for low pressure/low volume to a multi-stage configuration capable of compressing to very high pressure. In these compressors, air is compressed in stages, increasing the pressure before entering into the next stage to compress the air into even higher pressure.

Rotary Lobe

Rotary lobe blowers and rotary lobe pumps belong to the group of dry running positive displacement pumps. There is no need for oil or grease in the compression chamber. Only gear box and bearings, which are separated from the pumping chamber, are oil lubricated.

Air enters the inlet opening into a conveying cell formed by the two rolling pistons in the housing. The cell is then separated from the inlet by the following piston head. The air in the cell is conveyed without reduction until it reaches the outlet, where air with a higher absolute pressure flows from the pressure chamber into the following cell, and must then be discharged. It is during this stage of the conveying that external compression takes place

Rotary Screw

Gardner Denver offers two types of products using screw technology. There are rotary screw pumps, which are dry running screw vacuum pumps which excel when it comes to small carbon footprint and low life cycle costs. They are mainly used in customized systems for the chemical and pharmaceutical industry and in a modified industrial version for food packaging, industrial parts cleaning and in the manufacturing of solar panels.

In many applications, compressed air has become active and in processes where air comes into contact with the process it serves, the quality of that air becomes critical.Our oil free screw compressors, or rotary screw air compressors, constitute the second type of products featuring the screw technology.

Rotary screw technology uses a displacement principle where the screw compression element main parts comprise male and female rotors that move towards each other while the volume between them and the housing decreases. The pressure ratio of a screw is dependent on the length and profile of the screw and of the form of the discharge port. The screw element is not equipped with any valves and there are no mechanical forces to create any imbalance. It can therefore work at high shaft speed and combine a large flow rate with small exterior dimensions.

Rotary Vane

Rotary Vane pumps and rotary vane compressors cover a wide performance range and come in dry running and oil lubcricated versions. The eco-friendly dry running rotary vanes are robust and economical needing little maintenance. The oil lubricated rotary vanes are the standard pump in numerous industrial applications.

In rotary vane technology, the rotor, the only continually moving part, has a number of slots machined along its length into which fit sliding vanes that ride on a film of oil. The rotor rotates within a cylindrical stator. During rotation, centrifugal force extends the vanes from their slots, forming individual compression cells. Rotation decreases the cell volume, increasing the air pressure. Its compact size makes it the ideal choice for customised compressed air and gas applications.

WOB-L

The WOB-L principle has a unitary piston rod that 'wobbles' inside the cylinder as the crankshaft rotates. Unlike the more conventional articulated piston pump, the piston and piston rod are a single item, usually a single casting. The piston rod is mounted to an eccentric bearing assembly, which in turn is mounted to the motor shaft to convert rotary energy from the motor into linear motion of the piston within the cylinder.

The piston is sealed to the cylinder by a flanged disk cup that forms both a seal and mechanical guide for the piston. It runs without lubrication in contact with a low friction, surface coated cylinder of high heat conductivity. As the piston is driven up and down, air resistance on the upward stroke expands the disk's seal on the piston against the cylinder wall to increase its efficiency, while compensating for the 'wobble' action.

Compressed air technologies

Gardner Denver offers a comprehensive range of compressed air technologies to suit a diverse range of applications. These include:

  • Rotary screw compressors
  • Centrifugal compressed air systems
  • Rotary vane compressors
  • Reciprocating compressors
  • Variable speed technologies
  • Oil-free technologies

Our Research and Development department is continuously working to ensure that our compressed air technologies are cutting edge and highly competitive in the market. Whether creating quieter and smaller footprint compressors or developing innovative energy saving compressor technologies for cleaner, greener, compressed air generation, we are always adapting to address our customers’ dynamic requirements.

Oil-free compressor technology

Today, operators place a lot of emphasis on improving performance and energy efficiency of their compressed air installations. It’s not only a cost-saving exercise, but also an essential part of a company’s corporate and social responsibility to decrease the environmental impact of its compressed air system.

One way that we are helping customers to reduce their carbon footprint is with our oil-free compressors, which ensure a clean, reliable compressed air supply plus a range of environmental benefits. Features include:

  • 100% oil-free construction, eliminating the possibility of oil contamination from the compressor
  • No oil to dispose, reducing maintenance costs and providing environmental benefits
  • Simple construction for quick and convenient compressor maintenance
  • Fewer moving parts, increasing reliability

Compressed air cost of ownership

There are many ways to improve compressor efficiency and reduce compressed air cost of ownership, and this doesn’t always involve investing in new equipment. Gardner Denver can help improve the efficiency and functionality of the entire compressed air system in a variety of ways.

  • We offer a compressed air audit service to assist customers in determining the appropriate compressor size and technology for the application. Air audits also help with compressed air system optimization. This can include advice on selecting the proper combination of fixed and regulated speed compressors, installation of a compressor control system, or simply reorganizing the current compressed air system.
  • We provide a range of compressor ancillary options, such as compressed air heat exchangers, dryers, filters and other downstream equipment, optimized to improve system energy efficiencies

Compressor service and maintenance

Industry figures estimate that compressed air systems can waste up to 30% of the compressed air through leaks, poor control or lack of maintenance. In addition, compressor efficiency may degrade with age; therefore, implementing a compressed air maintenance program is essential to ensure a high level of performance over the years.

Using genuine Gardner Denver spare parts and lubricants will also help improve compressed air efficiency. Our parts and lubricants are specially engineered for optimized performance and maximum reliability. Using other parts or lubricants may drastically degrade performance and can also void the manufacturer’s warranty.

Through our global network of sales companies and authorized distributors, Gardner Denver provides world class maintenance and service support with a team of highly trained and skilled compressor service technicians. From emergency call outs to scheduled preventative maintenance and remote monitoring of compressed air operating parameters, we can tailor a compressed air service package to meet the needs of any application.