Zhejiang Danau Industries Co., Ltd. [China]

Cold Water Commercial Pressure Washer 1.Professional technology 2.High quality 3.Competitive price 4.Good service

I .Introduction of the manufacture of High Pressure Washer

Zhejiang Danau Industries Co., Ltd was established in 1993, specialized in researching and manufacturing kind industrial, commercial and consumer high pressure and super high pressure pumps and washer , kind hand and power operated plant-protecting and gardening machines, are leading the industry in China , been the vice president of the nation plant-protecting and power washer association.

The main equipment of Danau industries are from USA , JAPAN and Swiss , they are CNC machine centre , high speed turning centre and other machines about 600sets , covering cutting , drilling , grinding , punching , plastic injection and blowing , painting and powder coating , anodizing , parts cleaning , and ceramic , etc .

The company has passed ISO9001 quality system certification, and the products have passed 3C, GS, CE , EPA , CARB , etc . Professional technology , high quality , competitive price , good service , the products get a great fame all over the world .

II.Technical information of High Pressure Washer

 III. Choose the suitable high pressure washer for your applications

 IV. What you should know about the pressure washer

CU(cleaning unit )=PSI(pounds per square inch)*GPM(gallons per minute)

CU(cleaning unit ):cleaning unit is multiplying PSI by GPM, useful comparing models , the higher CU the more cleaning power your pressure washer has .

PSI(pounds per square inch):A pressure washer’ PSI rating is the maximum amount of force (pressure ) discharged by the pressure washer .The higher the PSI, the more cleaning power available and the more things you will be able to clean .

GPM(gallons per minute):A pressure washer’s GPM rating refers to the water flow during one minute of operation . The higher the GPM , the faster you will be able to clean .

V. Operator errors of high pressure washer that will cost you much money

Cause 1. Running the pressure washer without water

Normally this will destroy the pressure water pump within minutes.

Cause 2.Running the pressure washer in extended by-pass

By-pass is when the pressure in on , and the trigger is off the water is re-circulating inside the pump manifold , the water temperature builds as time goes on . It is not allow to lets the unit run in by-pas for more than five minutes . This is because the heat buildup quickly damages the pump. Therefore , you have to run off the pressure washer every time you are not going to be spraying , even for some unit that installed with a thermal relief valve that will release the hot water and the pump feed with cold water to cooling down .

Cause 3.Cavitation                                                                                                      

Cavitation is caused by air getting into your pump . The air can damage your pump as it rapidly expands and contracts . The first sign of cavitation is loss of pressure and a hammering noise. The cause of cavitation is lack of water or air getting into the system .For example , your pressure washer is rated for 4.0GPM but the inlet hoes only provides 3 GPM, then the pressure washer pump will try to pumping 4.0GPM.The suction due to the lack of water will pull in air and cause cavitation. The only solution to cavitaion is to feed your pump the required amount of water and to make sure there are no leaks in the water inlet system .

Cause 4.Freezing

In the winter the water left in the pump after use will freeze and possibility of damage to the pump .The typical remedy for this is putting anti-freeze in the pump .So always keep the pump run for a extra seconds and pump our the excess water .

Cause 5.No lubrication and lack of lubrication

High-pressure pumps, like gasoline engines , required oil to lubricate transmission mechanism , the crankshaft, connecting rod and plungers . The oil is needed to keep the pump parts cool and turning freely . No oil and low oil will causes permanent damage to the pump. When the oil leak out , or water gets into the pump oil , the pump parts will overheat and begin to break apart. Always check your oil level and maintain the correct amount and type of oil in the pump to prevent damage .

VI. Comparison of different kind of high pressure washer

Direct –drive Gas high Pressure Washer

A “Direct Drive “ pump has a hollow shaft , which simply slides onto the drive shaft of a engine and the flange on the pump is mounted to the face of the engine , so the pump spins at the same speed as the engine—typically 3,600RPM.This system has the advantage of being simple , with few moving parts , and therefore is less expensive .The disadvantage is by having the pump spin as much as the engine the bearings get more war and tear , reducing the life span of the pump .

Belt –drive Gas high Pressure Washer

Belt-drive units use pulleys and belts to slow the speed of the pump . Where the engine spins as 3,600 RPM the pump will be slowed from 1,100 to 1,600 RPM depending on the pulley and belt set up. This system ensures long pump life because the bearings do not get as much wear and the pump is isolated from the heat for engine , being separated by the belts and pulleys . The disadvantage of this system is there is some loss of efficiency due to the additional frication from the blest and pulleys and more maintenance required adjusting the belts .

Gear-drive gas high pressure washer

Gear-drive units use an extra gear-reduction system installed between engine and pump , Gear Drive installation will not only keep the heat transfer down , but also make the pump turn at half speed which will result in longer life of the pump bearings and seals . Compared with belt drive system , the gear drive unit features more compact and less efficiency loss . This consequently makes such machines industrial and allows the pump continuously running .

Life time comparison chart

The pump life chart is a rough way of comparing the average pump life of the different gas drive systems based upon how much the pump spins over the life of the system .All other things being equal ,the slower the pump spins , the longer the pump will last due to bearing life and the wear and tear on internal parts . The way the pump is used and exposing the pump to adverse conditions like running dry , in extended by-pass , freezing , or cavitation coupled with insufficient maintenance will significantly affect how long the pump lasts in actual conditions .

VII. Terms of warranty and maintenance of High Pressure Washer

Our company warrants the original purchaser who uses the product in a consumer application (personal , residential or household usage ) that all products covered under this warranty are free from defects in material and workmanship for one year from the date of purchase .

All products covered under this warranty which are used in commercial application (i.e income producing ) are warranted to be free of the defects in material and workmanship for 90 days from the date of original purchase .

The warranty will not cover the following repairs and equipment

-Normal wear :Pressure washer needs periodic parts and service to perform well. This warranty also does not cover normal maintenance such as air filters, adjustments , fuel systems cleaning and obstruction(due to chemical , lime , dirt , and so forth ).

-Installation and Maintenance :This warranty does not apply to equipment or parts that have been subjected to improper or unauthorized installation or alteration and modification , misuse, negligence , accident , overloading , overspeeding , improper maintenance , repair or storage so as , in our judgment , to adversely affect its performance and reliability .

VIII. Domestic and International Exhibition of High Pressure Washer

Every year , Zhejiang DANAU Industries Co., LTD attend many domestic and international exhibitons , in Shanghai , Beijing , Guangzhou (Canton Fair ), and Germany, Russia ,Italy, Nertherland, USA ,Brazil , Australia , Indonsia , India , etc . 

International Trade show of 2012

USA ——NATIONAL HARDWARE SHOW with LAWN & GARDEN WORLD(MAY , 2012)

Netherlands——ISSA INTERCLEAN -Central and Eastern Europe -International Trade Fair for Cleaning and Maintenance (MAY ,2012)

I TALY—— EIMA—International Agricultural Machinery Exhibition ( November ,2012)

Cold Water Commercial Pressure Washer 3600PSI