October 16, 2015 by cazarin
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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).
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:
It is important to carefully check your system during assembly and operation to avoid the serious damage that can be caused by cavitation
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
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.
Most of these valves turn the fluid 270 degrees, be careful.
You must restrict the flow in order for them to work. You can starve and cavitate the pump quickly.
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.
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.
Warning! Axial Radial Pump use only Annovi Reverberi AR64545 axial radial crankcase oil.
All applied manufactures warranties void if non-Annovi Reverberi factory oil is used.
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.
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.
New Style Serial Number
Old Style Serial Number
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.
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.
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.
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.
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.
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