Air Compressor Parts List (A-Z Glossary)

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Air Compressor Parts List

If you're trying to identify a particular air compressor part, our comprehensive air compressor parts list can help. We've compiled a lists of parts for many popular air compressors, so chances are we have the one you're looking for. If not, feel free to contact us and we'll be happy to help you out.

• Absolute Pressure - The absolute pressure is the gauge pressure plus the atmospheric pressure.
• Aftercooler - Aftercoolers help remove the heat that is caused by compression. This way, the air or gas can be effectively dried.
• Air Dryer - An air dryer removes water from the tank and line. This is often done with a larger air compressor system.
• Air/Oil Separator - An air/oil separator removes oil from the air that comes into contact with the rotary screw compressor. This allows the oil to be recirculated. an air/oil separator is  an element of the system that is often overlooked. It is however a critical piece of equipment in any air compressor, as its function is to remove oil contaminants from the compressed air before it enters the discharge piping. The oil/air separator is a simple device that uses centrifugal force to remove the oil from the air stream. As the compressed air enters the separator, it is directed onto a series of baffles that deflect the air flow. This causes the heavier oil particles to be thrown to the outside of the separator where they are collected in a drain pan. The clean air is then allowed to pass through to the discharge piping.
• Air Receiver - The air receiver is the tank where compressed air is stored. The size of the tank depends on how the compressor will be used. The manufacturer will recommend a good size for the tank.
• Atmospheric Pressure - Atmospheric pressure is the pressure at a specific altitude. The atmospheric pressure at sea level is 14.7 PSI.
• Air Compressor - An air compressor is a machine that uses an electric motor or gasoline engine to power a device that draws in successive volumes of air from the atmosphere and compresses it to higher than atmospheric pressure. This way, more air than what would otherwise be naturally available can be delivered to tools and devices that require it. The compressed air is then stored in a tank until it is needed.
• Barrier Fluids - Barrier fluid is used to separate the air end and electric motor from the lubricant, which in turn protects both air end and motor.
• Bearings - a bearing is a device that supports the rotating components of the compressor. The bearings allow the crankshaft to rotate smoothly and quietly, while reducing friction between the moving parts. There are two types of bearings: ball bearings and roller bearings. Ball bearings are used in compressors that have a high speed of rotation, while roller bearings are used in compressors that have a lower speed of rotation. The ball bearings are located in the compressor's crankshaft, while the roller bearings are located in the compressor's piston.
• Belts - A compressor belt transmits power from the motor to the cylinder, which in turn drives the piston. The belt also helps to keep the compressor's components properly aligned. Over time, however, the belt can become worn or damaged, which can reduce its efficiency or cause it to fail outright. Replacing a compressor belt is a relatively simple task that can be completed in a matter of minutes.
• Blowdown Valves - A blowdown valve is a pressure relief valve that is typically used on compressors. The valve is designed to release pressure that has built up in the compressor, which can happen for a variety of reasons. The most common reason for pressure to build up in a compressor is when the system is shut down and the compressor is still running. This can cause the compressor to overheat and build up pressure. If the pressure gets too high, it can damage the compressor or even cause it to explode.
• Blower Motors - A blower motor powers the fan that keeps the air flowing through the machine. The blower motor is one of the most important parts of an air compressor, and it is also one of the most likely to fail. When a blower motor fails, it can cause a variety of problems for the air compressor.
• Blower Oils - Blower oils act as a coolant, lubricant and sealant. It is important to change the oil in your blower on a regular basis to ensure optimal performance. 
• Bull Rings - A bull ring is a circular metal ring that covers the end of the piston rod. This ring helps to keep oil and air from leaking out of the compressor, and also serves as a support for the piston. The bull ring is connected to the piston by a series of small metal rods, and is usually made out of cast iron or steel.
• Bushings or Hex Bearings - A bushing (sometimes called a "hex bearing") is used to connect the crankshaft to an oil-sealed rotary shaft. The bushing is made of high-strength steel and is precision machined to ensure proper alignment between the crankshaft and rotary shaft. The bushing also provides a seal between the two moving parts, preventing oil from leaking out and dirt and other contaminants from entering the air compressor. Bushings are typically made up of  two halves that are held together with bolts. The bolts must be tightened to the proper torque so that the bushing does not come loose and cause damage to the air compressor.
• Check Valves - A check valve only permits flow in one direction, and blocks the flow in the opposite direction.
• Coalescing Filters - A coalescing filter is a filter that helps remove dust, particles, and oil from the air. The coalescing filter is a vital component in ensuring that the compressed air is clean and free of any contaminants that could potentially damage sensitive equipment or products. Coalescing filters are typically installed in the air compressor's intake system, and they are often used in conjunction with other types of filters, such as particulate filters, to provide the highest level of protection for the air compressor and the equipment it is powering.
• CFM, or Cubic Feet per Minute, measures the volume or air that flows in one minute.
• Couplings - A coupling connects the two halves of the crankshaft. The coupling is located between the motor and the pump. There are two types of couplings: rigid and flexible. Rigid couplings cannot accommodate any misalignment between the shafts, while flexible couplings can accommodate a small amount of misalignment. Most air compressors have rigid couplings.
• Control Valves - A control valve helps to regulate the air pressure within the system. By modulating the air pressure, the control valve ensures that the system operates at peak efficiency and can maintain a consistent output of compressed air. Without a properly functioning control valve, an air compressor system would be less effective and could potentially cause damage to equipment or injure operators.
• Controllers - A controller monitors and adjusts air pressure, ensuring your that the air compressor does not overheat and that the air pressure is maintained at a consistent level. There are various types of controllers, but their overall goal is to keep the air compressor functioning properly. Many controllers are motherboards, which contain a variety of sensors and switches that allow the air compressor to function properly.
• Design Pressure - This is the maximum pressure a machine can handle without being damaged.
• Desiccant - A desiccant is a substance that helps keep things dry. Its purpose is to adsorb water molecules from the air and keep them from condensing on surfaces or forming droplets. Desiccants are commonly used in air compressors to help prevent moisture build-up and corrosion.
• Discharge Valves - discharge valves release compressed air from the tank when the pressure in the tank has reached its maximum. The discharge valve is also responsible for re-admitting air into the tank when the pressure in the tank has dropped below a certain level.
• Drain Valves - A drain valve is a device used to remove liquid from a compressor. This can be done manually, with a float or electronically.
• Dryers - A dryer dries the air in the tank, so that there is less water in the air to rust the tank, since most tanks are made of steel.
• Dryer Filters - Dryer filters dry the air before it enters the air compressor. This is a very important function because if there is moisture in the air, it can cause problems with the air compressor. The moisture can cause the air compressor to rust and it can also cause the air compressor to freeze up.
• Elbow Tubes - Elbow tubes serve as a connector between two different pieces of equipment. Elbow tubes are commonly used in a wide variety of industries, including automotive manufacturing, food and beverage processing, and chemical manufacturing. 
• Fans - A fan takes air and directs it into the compression chamber. The fan is also responsible for moving cooling air through the compressor to keep it from overheating. As air is compressed, it becomes hot. The cooling air that the fan blows over the compressor helps to dissipate this heat and keep the compressor operating at a safe temperature. If the compressor gets too hot, it can be damaged or even catch fire.
• Fan Wheels - The purpose of a fan wheel is to cool the motor. It is important to have a properly functioning fan wheel in order to prevent the motor from overheating.
• Filter Housing - Filter housing is a protective casing that surrounds an air filter, oil filter, separator, or coalescing filter. The strongest filter housings are typically metal, but they can also be made of plastic.
• Filter Pads and Mats - A filter pad or filter mat removes particles of rust, scale, dirt or other impurities from the compressed air. A filter pad is a type of filter mat that is made of two layers of fabric with an adhesive between them. The fabric is usually made of polyester or nylon and the adhesive is usually acrylic based.
• Fittings - Air Added collections page description for compressor fittings connect air hoses, tubes or pipes to each other or to a device such as an air tool or an air tank.
• Food Grade Oils - The main difference between a regular air compressor oil and a food grade oil is that food grade oils have fewer additives, and they are more pure. This is because food grade oils need to be able to withstand higher temperatures without breaking down, and they also need to be able to resist corrosion from all of the different chemicals that they come into contact with in the food processing industry. 
  
  Food grade air compressor oils are also designed to be more stable than regular air compressor oils. This means that they will last longer and will not break down as quickly. They also have a higher flash point, which means that they will not catch fire as easily.
  
  Finally, food grade oils have a higher viscosity, which means that they will not thin out as easily. This is important because thin oils can cause problems with the compressor pumps, and they can also cause leaks.
• Gaskets - A gasket makes a seal between two metal surfaces so that air can be compressed inside the unit. Gaskets are made of a variety of materials, such as rubber, cork, neoprene, and silicone. In order for a gasket to work properly, it must be soft enough to make a seal, yet firm enough to stay in place. If a gasket is not the right size or material, it can cause problems.
• Gauges - Within an air compressor, there are different types of gauges, such as the pressure gauge, the temperature gauge, and oil level gauges. The purpose of these gauges is  to help the operator of the air compressor keep track of how well the machine is functioning. By monitoring these gauges, the operator can make sure that the air compressor is working properly and not overworking itself.
• Heat Exchangers - A heat exchanger cools the compressed air after it has been used. This is done by exchanging heat between the compressed air and another medium, usually water or air. Air-cooled heat exchangers are typically used in situations where water is scarce or expensive, or where the air is already at a temperature that can be used for cooling.
• Hoses - A hose directs the flow of compressed air to the tools or other equipment that need it. The hose is made of tough materials that can withstand high levels of pressure, and it is equipped with fittings on each end that make it possible to connect the hose to the air compressor and the tool. 
• Hydraulic Oils - hydraulic oil lubricates moving parts, minimizes wear and prevents metal-to-metal contact. The oil also helps to remove heat away from compressor internals, which is essential in preventing overheating and ensuring optimal performance. In terms of the types of compressors, hydraulic oil is typically used in rotary screw air compressors. 
• Ignition Switches - an ignition switch  turns on the motor that runs the pump. The switch also controls an unloader valve, which bleeds off air pressure when the compressor isn't running.
• Inlet Air Filters - An inlet air filter removes dirt and contaminants from the air inside of an air compressor. Air filters are essential to ensuring the life of the compressor.
• Inlet valves - inlet valves admit air into the compression chamber. The valve is located at the inlet end of the cylinder, where the piston is moving towards it during the intake stroke. Air enters through the inlet valve and is compressed by the piston as it moves towards the other end of the cylinder during the compression stroke.
• Intake Valves - Pretty simply, the purpose of an intake valve is to let air in. The intake valve is opened when the piston is at the top of its stroke, and it allows air to flow into the pump chamber. The intake valve is closed when the piston is at the bottom of its stroke, and it allows the air to be compressed. The intake valve is opened and closed by a cam, which is actuated by the compressor's crankshaft.
• Minimum Pressure Check Valves - ​​Minimum pressure check valves are placed in between the pump and air tank of an air compressor. These valves serve two purposes: to keep air from flowing back into the pump when the air compressor is not in use, and to keep air from flowing out of the tank if the pressure exceeds the maximum safe pressure level.
• Mixing Valves - The mixing valve is used to control the flow of air and oil within an air compressor.
• Moisture Separator - A moisture separator is a device that collects and removes moisture from the air during the cooling process.
• Mufflers or Silencers - Air compressors are noisy machines, and the intake silencer, or muffler, helps to muffle that noise. Mufflers  work by redirecting the airflow from the intake port so that it hits the back of the compressor head instead of passing through the head and out the exhaust port. The redirected airflow causes a "back pressure" that helps to quiet the machine. Mufflers also help to keep dirt and other debris from entering the compressor head, which can damage the piston and other internals.
• O-Rings - An o-ring is a circular seal that is placed around a rotating shaft. The o-ring is designed to keep air from leaking out of the compressor. There are two types of o-rings: static and dynamic. Static o-rings are used to seal stationary parts, such as the air inlet and outlet ports. Dynamic o-rings are used to seal moving parts, such as the piston or crankshaft. If an o-ring is not properly sealing, it can cause the compressor to work less efficiently and may even damage the compressor over time.
• Oil Filters - Oil filters help to remove impurities from the air compressor oil, keeping it clean and extending the life of the compressor. The types of air compressors that use oil filters  include reciprocating air compressors, rotary screw air compressors, and scroll air compressors.
• Oil-Free Compressor - An oil free compressor is a compressor is just what is sounds like: a compressor that doesn't use oil. This type of compressor is most used in the medical field and the food processing field.
• Oil Stop Valves - This valve is placed in the air compressor so that oil will not leak out when the unit is shut down. If this valve were not in place, oil would leak out and contaminate the air that is being compressed. This would cause the compressor to work less efficiently and could eventually damage the unit.
• Oil/Water Separators - An oil/water separator is used to remove oil and water from compressed air. The oil/water separator is an important part of a compressed air system as it helps to extend the life of your air compressor and other equipment by preventing oil and water contamination. There are a few different types of oil/water separators on the market, but they all work by using a baffle system to separate the oil and water from the compressed air. The most common type of oil/water separator is the coalescing type, which uses a series of baffles to coalesce the oil droplets in the air and then separates them from the water. Another type of oil/water separator is the cyclonic type, which uses a spinning motion to separate the oil and water.
• Packing Rings - A packing ring is a seal that is used to prevent air from leaking out of the compressor. The packing ring is located between the piston and the cylinder head. When the piston goes up, it pushes air into the cylinder head and when the piston goes down, it pulls air out of the cylinder head. The packing ring is what seals the space between the piston and the cylinder head so that air can not escape.
• Partial Synthetic Oils - This oil is made of a mixture of petroleum-based oil and synthetic oil, which work together to provide superior protection against wear and tear. Additionally, semi-synthetic oil is designed to withstand higher temperatures than conventional oils, making it an ideal choice for use in air compressors.
• Petroleum Oils - Of the compressor oils in the market, petroleum-based oil is the most common type of oil and also the most economical option. However, petroleum oil has a shorter service life than partial synthetic oil or synthetic oil and is not as effective in extreme temperatures.
• Pipes or piping - The job of an air compressor pipe is to move air within the compressor. Pipes can be made out of various materials, including steel, copper, plastic or even rubber. Generally speaking, the pipe that is closes to the compressor (an inlet or suction pipe) is larger because it needs to draw in a large amount of air. The outlet pipe is generally smaller since it is carrying air away from the compressor. All pipes need to be strong enough to withstand pressure exerted from the moving air.
• Pistons - Pistons draw air into the cylinder through an inlet valve and then compress it using downward movement before finally releasing it through an outlet valve. The piston is connected to a crankshaft via a connecting rod and, as the crankshaft rotates, so does the piston.
• Piston Rings - A piston ring is a seal that is attached to the piston in order to keep air from leaking into the crankcase. The piston ring also helps to keep oil from leaking into the cylinder. There are two types of piston rings: compression rings and oil rings. Compression rings are located at the top of the piston and are responsible for sealing the combustion chamber. Oil rings  are located at the bottom of the piston and are responsible for keeping oil from leaking into the cylinder.
• Piston Rods - The piston rod is the part of the air compressor that moves back and forth in order to compress air. 
• Piston Valves - A piston valve controls the flow of air in one direction and prevents air from flowing back into the compressor. A piston valve is connected to the piston and located at the end of the cylinder on the side opposite the air intake.
• Pneumatic - pertaining to equipment that is operated by air or gas under pressure.
• Pneumatic Valves - Pneumatic valves release air from the compressor in a controlled manner. There are two types of pneumatic valves- those that release air to atmosphere and those that release air to a storage tank. The release of air to atmosphere is used when the compressed air is not going to be used immediately and can be released into the atmosphere. The release of air to a storage tank is used when the compressed air is going to be used immediately or in the near future and needs to be stored in a tank for quick and easy access.
• Pressure Relief Valves - Pressure relief valves are typically located near the top of the air compressor tank, and are connected to the tank via a pipe or hose. When the pressure in the tank reaches a certain level, usually around 150 PSI, the relief valve will open and release air until the pressure drops to a safe level.
• Pressure Switches - A pressure switch is a tool that senses when the pressure changes. When it does, the pressure switch will trigger the adding or decreasing of air in the tank.
• Preventative Maintenance (PM) - An annual, quarterly, or semi-annual maintenance program, where an organization proactively fixes degraded parts before they break. The benefits of a preventative maintenance program are that it can reduce the likelihood of unexpected downtime, improve equipment performance, and extend the life of the equipment.
  
  A preventative maintenance program typically includes a schedule of activities that need to be performed, and may also include inspection and testing procedures. The activities in a preventative maintenance program are typically performed by trained technicians or engineers.
• Probes - The purpose of a probe is to collect information about temperature, pressure, and volume of air flowing through the compressor. A probe monitors air pressure and shuts down the system when it gets too high. The probe is usually located on the discharge side of the compressor, where it can monitor air pressure as it leaves the machine. 
• Pumps - a pump stores energy in the form of potential energy or pressure. By doing this, the compressor is able to supply compressed air on demand.
• Purging - purging speaks to the voluntary release of gas or liquid from a system.
• Purge Valves - purge valves remove moisture, oil, and debris from the system prior to start up. By doing so, it allows for clean, dry air to enter the compressor on initial start up which helps extend the life of the unit. A properly functioning purge valve is essential for ensuring that your air compressor operates efficiently and effectively. If your purge valve is not functioning properly, it can cause a number of problems with your air compressor, including decreased efficiency, increased wear and tear, and even damage to the unit.
• Receiver - a receiver is a tank for storing compressed air. Sometimes, in a more complex operation, users will store air in multiple receiver tanks.
• Reciprocating Compressors - A reciprocating compressor is a machine that uses pistons, driven by a crankshaft, to push gas into a container. Air is drawn into the pump where it is trapped between two pistons. As one piston moves up, the other moves down, compressing the air between them. This process continues until the air is compressed to the desired level and then stored in a tank.
  
  Reciprocating compressors are typically powered by: electric motors, diesel engines, or gasoline engines and are typically used for applications requiring pressures of 100 PSIG or less. Reciprocating compressors are available in a variety of configurations, including: air-cooled, oil-cooled, and water-cooled. They are typically used in industrial and commercial applications such as: air conditioning, refrigeration, and natural gas compression. 
• Regulator Valves - regulator valves control and maintain the pressure within a compressed air system. There are two types of regulator valves, which are direct acting and pilot operated. Direct acting regulator valves are used in applications where there is a constant demand for air flow, such as in an air line that supplies tools. Pilot operated regulator valves are used when the demand for air flow varies, such as in an air line that supplies air to a machine that is turned on and off.
• Retaining Rings - A retaining ring  helps keep the piston in place while it moves up and down. The piston is attached to a crankshaft, which is turned by an electric motor. As the crankshaft turns, the piston is forced up and down, compressing air in the chamber. The compressed air is then sent through a pressure release valve to an air tank.
• Rotary Screw Compressor - A Rotary Screw Compressor is a compressor which uses two interlocking rotors to compress air. This type of compressor can run for a long time at low temperatures without breaking down. The rotors in a rotary screw compressor are meshed together, and as they turn, they draw air into the chamber between them. The chamber volume decreases as the rotors turn, and this decrease in volume causes the air to be compressed. The compressor is lubricated by oil, and this oil also helps to seal the chamber, keeping the air from leaking out.
  
  Rotary screw compressors are used in a variety of applications, including air conditioning, refrigeration, and industrial settings. They are also used to power pneumatic tools. A rotary screw air compressor works using two meshed rotating screws that compress the air as they turn. The screws draw the air into the chamber where it is compressed between the threads of the screws and the walls of the chamber.
• Safety Valves - A safety valve is a valve which limits how much pressure builds up in a compressor. When triggered, it releases some of the liquid or gas that is under pressure. This keeps the pressure from getting too high and causing damage to the machine.
• Seals - Within an air compressor, a seal's job is to  make sure that no air or other fluids escape from the cylinder into the pump, and vice versa. It also helps to keep the piston and connecting rods lubricated. The most common seal used in air compressors is the lip seal, which is made of a soft material that presses against the metal walls of the cylinder to create a seal. Other types of seals include: oil seals, pipe seals, and shaft seals.
• Separators - Separators purify the compressed air by removing water, oil, and other contaminants from it. By doing so, the quality of the air is improved, and its life span is prolonged. 
• Solenoid Valves - solenoid valves direct the flow of air. The most common use for a solenoid valve is to turn an air compressor on or off. A pressure switch controls the solenoid valve. When the pressure in the air compressor drops below a certain level, the pressure switch signals the solenoid valve to open and allow air to flow into the compressor. When the pressure in the compressor reaches a certain level, the pressure switch signals the solenoid valve to close, stopping the flow of air into the compressor. 
• Stepper Motors - Stepper motors open and close the inlet valve that controls air flow into the pump. The motor is mounted on the side of the compressor, with a small gear attached to its shaft. This gear meshes with a larger gear on the valve, which opens or closes the valve depending on which way the motor turns. As the stepper motor turns, it moves the valve gear back and forth. This action opens and closes the valve, allowing air to flow into the pump or be released from it. The stepper motor is controlled by a computer, which tells it when to open and close the valve. This allows the compressor to operate at different speeds, depending on the needs of the system.
• Synthetic Oils - synthetic oil keeps the various parts of the air compressor properly lubricated. This oil is also used as a coolant, since it has a very low freezing point. As the synthetic oil circulates through the system, it helps to dissipate heat, which is necessary in order to keep the system running smoothly and efficiently.
  
  One advantage of using synthetic oil in your air compressor is that it does not break down as easily as traditional oils. This means that it will last longer, and you won't have to replace it as often. Synthetic oil is also more resistant to high temperatures, so it can withstand the heat generated by the compressor without breaking down.
  
  Another advantage of synthetic oil is that it is not as likely to cause sludge buildup. Sludge is a byproduct of the breakdown of traditional oils, and it can clog up the air compressor and reduce its efficiency.
• Temperature Switches - a temperature switch is designed to monitor the temperature of the air that is being compressed. If the temperature rises above a certain level, the switch will activate and shut off the compressor. This is important because if the air becomes too hot, it can cause damage to the compressor.
  
  There are two main types of temperature switches that are used in air compressors: mechanical and electrical. Mechanical switches are the most common type, and they work by using a bimetallic strip that expands when it gets hot. This expansion causes the switch to trip and shut off the compressor. Electrical switches are less common, but they can be more accurate than mechanical switches. They work by using a sensor to monitor the air temperature. If the temperature rises above a certain level, the switch will activate and shut off the compressor.
• Thermal Valves - A thermal valve, or thermostatic valve, in an air compressor regulates oil flow to maintain optimal operating temperature. It restricts oil flow to the cooler when cold, helping the compressor warm up quickly, and opens fully as temperatures rise, allowing the oil to cool and preventing overheating. This balance keeps the compressor running efficiently, protects internal components, and extends the machine's lifespan by stabilizing oil viscosity and preventing excessive wear.
• Transducers - A transducer is used to monitor the pressure within the compression chamber and provide feedback to the controller. This is important in order to maintain a consistent air flow and prevent overheating. Additionally, transducers can be used to measure the speed of the compressor motor and the temperature of the compressed air.
• Unloader Valves - An air compressor unloader valve is a device that releases the air inside the compression chamber and tank discharge line when the motor stops. This makes it easier for the motor to start with each use. There are two types of unloader valves: electrical and mechanical.
• Vacuum Pumps - A vacuum pump is a compressor that takes in air below the atmospheric pressure and pushes it out with a higher pressure. An air compressor vacuum pump  is used in many industries and applications. In order to increase the pressure of the air, a vacuum pump compresses the air by drawing it into a cylinder where it is then pushed out at a higher pressure. 
• Vibration Pads - a vibration pad helps to reduce the noise that is produced by the machine. There are a few different ways to go about this, but the most common method is to use a vibration pad that is made of rubber. This material will help to absorb some of the noise that is produced by the compressor, and it can also help to keep the machine from vibrating excessively.
• Water Regulator Valves - water regulator valves maintain a water level inside the air compressor tank at a specific level. The water regulator valve is attached to a float switch, which turns the air compressor on and off according to the level of water in the tank. If the water level in the tank gets too low, the float switch will trigger the air compressor to turn on and start pumping air into the tank. Once the water level reaches the desired level, the float switch will turn the air compressor off.

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