A.R. North America, Inc stocks the most comprehensive inventory of pumps, parts and accessories in the industry. All cataloged parts are 99.85% in stock. If an item is ordered and not in stock a customer service representative will call or fax you a back-order alert/status.

Contact our customer service support line to check availability.

Buying Direct
 A.R. North America, Inc. policy is to sell only through qualified manufactures, dealers and wholesale distributors. If you are an end user of high pressure equipment, please visit our Service Dealer section or give us a call. We’ll be happy to provide you with the phone number of a retail supplier in your area.

As a qualified manufacture, dealer or wholesale distributor, please fill out the account application or contact our sales staff.


By-pass is usually associated with and unloader or regulator valve. Both of these valves have a by-pass port that when pressure in the system is greater than the operating pressure the valve piston will move away from the seat area and allows the fluid to be redirected either back to the pump inlet, feed tank or to atmosphere. This by-pass port has a large diameter hole to keep by-pass pressures low.

Positive displacement pumps are always trying to move a fluid as long as they are running. If the discharge flow is stopped and the fluid has nowhere to go something in the system will fail (split hose or fitting, broken connecting rod(s) or stretched manifold on the pump).

Can you identify and avoid cavitation? Cavitation is the formation and collapse of gaseous cavities in a liquid which causes severe wear or eroding of the metal wear surfaces in the pump.
The most obvious sign of cavitation is a hammering noise. The noise can be either consistent or intermittent depending upon the degree of cavitation and damage to the pump. Vibration of the pump and system will also be noticeable as the pump is starved of fluid. Eventually flow and pressure will decrease.
Check your system for these conditions which may contribute to, or directly cause, cavitation:
  1. Inadequate inlet line size
  2. Insufficient inlet flow or excessive suction
  3. Excessive inlet line length
  4. Rigid inlet plumbing
  5. Too many elbows and/or fittings
  6. Excessive temperature build-up or pumped fluid
  7. Air leak in inlet plumbing
  8. Agitation in supply reservoir
  9. Inadequate increase of inlet flow for fluids of greater specific gravity
  10. Inadequate increase of inlet flow for higher temperature fluids
  11. Clogged inlet filters.

It is important to carefully check your system during assembly and operation to avoid the serious damage that can be caused by cavitation

The Cleaning Equipment Trade Association (CETA) is an international non-profit trade association made up of manufacturers, suppliers, distributors, and affiliates who coordinate their efforts to promote public awareness, professionalism, industry-wide safety standards, and education for the advancement of the powered cleaning equipment industry.

Originally formed as an association of manufacturers, the Cleaning Equipment Manufacturers (CEMA) was chartered to address the common needs of the emerging cleaning industry. CEMA full membership was restricted to equipment manufacturers with suppliers offered associate member status.

In 1990, in response to the changing forces in the marketplace, CEMA and the Association of Pressure Washer Distributors (APD) formed a partnership. This merger and the resulting By-law revisions created the Cleaning Equipment Trade Association (CETA).

Cleaning Equipment Trade Association
968 Lake Street South, Suite 202, Forest Lake, MN 55025
Toll Free: 800-441-0111 Phone: 651-982-0010 Fax: 651-982-0030


Crankshaft I.D
Each triplex plunger pump has a crankshaft identification stamping. This stamping identifies the shafts manufacturing code and stroke of the crankshaft. Inform our technical staff what this number is in case the pump tag has is absent from the pump manifold.


RK Seriespart number
RSV Seriespart number
XM Seriespart number
XT Seriespart number
XW Seriespart number
Inlet Conditions

One of the most important considerations when designing a system is to keep the inlet simple. You should try and stay away from angle fittings, bushings, restrictive filters, small diameter hoses and non-full port fittings and valves.

Three types of feed conditions:

1) Pressurized – Is a foreword regulated flow and pressure (preferred).

2) Flooded – Gravity induced flow and pressure (low PSI) (must use caution).

3) Suction – Lifting the fluid into the pump (least desirable, can easily cause cavitation. This type of system is used to have a 0 to minus head to induce chemicals into the pump).

Hose and Plumbing selection:


The hose must be flexible with a smooth I.D. (no ribs to cause cavitation or turbulence). The pressure rating should be at least 250 PSI working pressure. You should also make sure the hose does not swell a great deal under pressure or collapse under suction. Make sure the selected hose is compatible with the regional weather conditions (i.e. hot, cold, UV, etc.).


Again this will depend on your supply system. There is one basic rule: Never use a supply line small than the pump inlet (you can never be too large). With a pressurized system a 3/4” garden hose is sufficient to 7 GPM (depending on the pump being used and type of fluids being pumped), for some of the small pumps (to 3 GPM) you can use a 5/8” hose (depending on the pump being used and type of fluids being pumped).

One Note – any time you use a garden hose flush it out prior to each use. (They usually are dropped on the ground and will have dirt in the fitting)

On flooded inlet systems the hose diameter should be 1-1/2 to 2 times the inlet size. Flooded or gravity feed systems have very little pressure so you must rely on volume to the pump instead of pressure.


Keep the number of fittings to a minimum and try not to use 90° fittings. They cause turbulence and resistance. Only use full port fittings. Ball valves work the best for shut off valves make sure they are full port (never restrict upstream). Example: 45° elbow in 1 1/2” Ø= 1.9’ of straight pipe. 90° elbow in 1 1/2” Ø = 4.1’ of straight pipe.

Solenoid valves:

Most of these valves turn the fluid 270 degrees, be careful.

Upstream Injectors:

You must restrict the flow in order for them to work. You can starve and cavitate the pump quickly.

Pressure Gauges:

Install a Hg to + PSI gauge to monitor the inlet pressure.

Make sure all of the connections and threads are sealed and tight. If a fitting sucks air you will have cavitation in the system. A fitting sucking air will not always leak fluid.

Manufacturers Safe Data Sheet


Code: AR64516 (PDF 266KB)

part number

Code: AR64545 (PDF 178KB)

part number

Multiple Pump Systems
Pumps may be linked together into a common discharge header to increase flow. Each pump should have it own electric motor and unloader or regulator, so as volume either increases or demand pumps can be turned on or off to accommodate your needs.
How often should I change pump oil?


Annovi Reverberi recommends that triplex plunger pump crankcase oil be changed only after the first 50 hours of use. Annovi Reverberi includes special formulated crankcase break-in oil that includes anti-corrosive and anti-wearing properties. Change oil every 200 hours after the first 50 hour oil change.

Warning! Triplex Plunger Pump should only use our factory recommended crankcase oil.

Code: AR64516

part number

Warning! Axial Radial Pump use only Annovi Reverberi AR64545 axial radial crankcase oil.

Code: AR64545

part number

All applied manufactures warranties void if non-Annovi Reverberi factory oil is used.

Established list pricing is available only through qualified manufactures, dealers and wholesale distributors.
A.R. North America, Inc. policy is to sell only through qualified manufactures, dealers and wholesale distributors. If you are an end user of high pressure equipment, please visit our Service Dealer section of give us a call. We’ll be happy to provide you with the phone number of a retail supplier in your area.
As a qualified manufacture, dealer or wholesale distributor, please fill out the account application or contact our sales staff.

Pulsation in the standard pumping system is natural. It is produced when the plunger reaches the forward end of each stroke, at each point the fluid in the cylinder has been pushed out. The plunger must complete one complete revolution before that point is reached again, during that time span no fluid is flowing from that cylinder. This is what creates the pulse (simply put the flow from the pump is not constant).

Pulsation is very prevalent in a one-cylinder pump and smoothens out as the number of cylinders increases. This is due to an overlap of cylinders moving at one time. Below are curves showing how pulsation quiets with added cylinders.

Reading AR Pump Part Numbers
 How to read the A.R. Pump Part Number:


part number

Run Dry
 If the pump is run without fluid it is being “run dry”. The seals in pumps are comprised of rubber or rubber coated fabrics, and rely on the fluid being pumped as its lubricant. In run dry conditions friction increases very quickly between the plunger and seal, the result is damaged seal. The faster the pump is being run the faster the damage is seen.
Serial Number
 Each Annovi Reverberi Pump is supplied with its own identifying serial number. Annovi Reverberi changed (2005) the style and the information contained in this number to accurately identify production date.


New Style Serial Number

part number

Old Style Serial Number

part number


Pump Inlet & Discharge Valves Facts:

Both inlet and discharge valves in all of our pumps with one exception are the same and can be installed in any port. The exception is the XJV & SJV series pumps where the inlet valves have high tower cages.

Valves are wear parts and need to be changed when they become worn.

Life of the valves depends on several factors – water hardness, water cleanliness, dirt filtration, cavitation or if chemicals are run through the pump.

Trouble shooting potential valve problems:

Pressure gauge fluctuates or there is a pulsation in the inlet or discharge line – The valves are probably worn and should be replaced

Low pressure – worn valves, debris stuck in the valve(s), accumulation of dirt or hard water minerals in the valve(s), the valve poppet(s) are stuck to the valve seat(s) from the minerals in the water that has evaporated after long storage periods. The valves should be cleaned or replaced.


What is the A.R. Pump Warranty?

Annovi Reverberi, North America warranty period is established from the date of invoice/shipment. The standard A.R. warranty is one year; however, certain models carry extended warranty periods as outlined in our full warranty statement. Items not covered under the standard warranty include wearable items such as seals, cups, o-rings, valves, seats and manifolds. Pumps are not covered under warranty, if run beyond their specifications, abused or neglected, serviced with other than genuine Annovi Reverberi parts or operated with alternative oils that do not provide proper lubrication.

Water Hammer

Is the result of a rapid increase in pressure which occurs in a closed piping system when the liquid velocity is suddenly changed by sudden starting, stopping or change in speed of a pump; or sudden opening or closing of a valve which may change the liquid velocity in the system.

This increase, or dynamic change in pressure, is the result of the kinetic energy of the moving mass of liquid being transformed into energy, resulting in an excessive pressure rise which can cause damage on either the suction or discharge side of the pump.

Water hammer may be controlled by, the regulating valve closure time, surge chambers (accumulators/pulsation dampeners), relief valves or other means.

In fluid flow, water hammer can cause rupture and serious damage to the entire piping system.

Winter Pump Storage
It is a given that when water freezes it expands, if the pump is full of a freezing fluid you may cause some irreversible damage. Broken plungers, damaged packings and ruptured manifolds to mention a few.


There are three ways to protect your pump.

Store it in a warm area. Blow out the fluid with compressed air (30 – 70 PSI) and Circulate a mixture of 50% antifreeze and 50% water through it.

One word of caution make sure you are not breaking any EPA regulations. If you use your pressure washer in areas of the country that get below freezing make sure it is thawed out and free from slush before running.

The winterizing information listed above is only for the pump; the rest of the system must also be protected.

  1. Always check with the equipment manufacturer for their recommendations on winterizing.
  2. Down time costs you profit.
  3. Neglect or I will fix it later can be your worst enemy.
  4. Fix any and all problems when they occur.
  5. Keep spare parts on hand.
  6. Understand why the repair was needed.
  7. Usually repairs are not made until the operation of the equipment has become so bad that it usually does not work.
  8. Use a professional repair facility, they will repair your equipment the proper way and save you time and money.

The high-pressure pump is used in such an array of applications that one must protect yourself and company in today’s world. Safety issues are very prevalent in today’s world, nobody wants to see anyone injured, “liability” is very visible. Preventative maintenance can not only reduce the risk of injury; but also cut “down time”, increase profits, decrease costs and increase the equipment life. Understand your equipment.

Remember the pump is generally one of the most dependable and best-constructed components in a high-pressure washer.