WORKING PRINCIPLE
The series SELF-PRIMING CENTRIFUGAL PUMPS,Self-priming is achieved using an ejetor,housed in the pump body,The total delivery produced by the closed centrifugal impeller is sent only partly to the delivery opening.The remaining water is recirculated through the ejector,which is connected to the suction chamber and generates the necessary vacuum to self-prime the pump.When first staring the pump fill the pump body with water,without bothering to fill the suction piping and eliminate any air pockets.When the pump is started up the water in the pump body circulates through the ejector and transfers any air from the suction to the delivery chamber,expelling it through the delivery piping.At the same time the vacuum thus generated causes water to rise in the suction piping,thus self-priming the pump.Since the self-priming system operates continuously,these pumps are practically unaffected even by the presence of large amounts of entrained air in the fluid being pumped.
The series,based on past CACHENG experience,is designed with particular attention to hydraulic efficiency and choice of materials.The result is a compact,quiet,high performance pump.

PUMP INSTALLATION AND APPLICATIONS
These pumps are suitable for pumping clean water and fluids which are not chemically aggressive to the pump components.
THEY ARE EXTREMELY RELIABLE,ECONOMICAL AND SIMPLE TO USE,BEING PARTICULARLY SUITABLE FOR DOMESTIC APPLICATIONS SUCH AS THE AUMTOMATIC DISTRIBUTION OF WATER FROM SMALL AND MEDIUM-SIZED SURGE TANKS,WATERING GARDENS,ETC.
These pumps should be installed in a covered area,protected against the weather
N.B.It is always advisable to install a foot valve or a non return valve on the suction opening.

PERFORMANCE
The wide range of pumps in the series satisfies the most varied requirements with features such as:
1.high heads with respect to power requirements;
2.flat operating and power absorption curves,giving moderate curve variations with respect to large variations in delivery demand;
3.high tolerance of the presence of entrained air in the fluid to be pumped;
4.suction capacity up to 9 meters.

STRUCTURAL CHARACTERISTICS
1.Plastic/stainless steel PUMP BODY with UNI ISO 228/1 gas threaded suction and delivery openings.
2.Stainless steel PUMP BODY COVER serving also as mechanical seal housing.
3.EJECTOR UNIT
4.Centrifugal radial flow IMPELLER in BRASS or technopolymer on request.
4.Stainless stell MOTOR SHAFT.
5.Ceramic and graphite MECHANICAL SEAL.
6.MOTOR:the pumps are coupled directly to an asynchronous,high efficiency CACHENG induction motor of suitable size,which is quiet running,closed and externally ventilated,suitable for continuous duty.INSULATION class B.
The thermal cutout relay(motor protector)is incorporated in single phase motors.
Three phase motors require an adequate external motor protector,with connections according to current standards.
7.PROTECTION IP 44.