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FEATURES

Valveless

This patented VALVELESS feature has been a World Chemical trademark since 
1971.  Because of this unique priming mechanism, this pump does not require any 
foot valves.  Also, the built-in check valve reduces backflow velocity to retain 
maximum liquid in the priming chamber at pump shutdown.

(continued)

Uniquely resistant to high temperatures

Our originally engineered design has the unique capability of constantly and smoothly 
self-priming and suctioning even in temperatures as high as 184 

°

F (70 

°

C ).

Resistant to wide range of chemicals

Parts such as the pump base and the motor bracket that come in contact with 
chemical solvents are constructed with a high resistant resin.  Thus the pump will not 
erode from chemicals or atmospheric gases, and can also be used with hard-to 
handle chemicals such as sulfuric acids, nitric acids, caustic sodas, hydrofluoric acids 
and electro-less nickel plating solutions.

THE PRINCIPLE OF SELF-PRIMING

The NSF/SF series is a uniquely developed sealless and valveless self-priming 
centrifugal chemical pump.  The primed water that fills the whole interior of the pump 
moves to the self-priming chamber guided by the impeller after the pump is turned on.  
In the self-priming chamber, the air and water separate as they rotate.  The water is 
propelled into the impeller as it leaves the self-priming rotational outlet located on the 
bottom of the pump, and continues its repetitive cycle of self-priming.  Air from the 
shaft is sealed by the seal blades during self-priming.  As an added measure, a 
balance hole is constructed on the casing to release air into the self-priming chamber, 
ensuring that the self-priming operation is not affected.  While the pump is not in use, 
the siphon cut hole located on the interior of the self-priming chamber and the suction 
chamber blocks the backflow from the siphoning action.  Water that is necessary for 
the subsequent prime remains in the suction chamber for smooth pumping

Pump is filled with 
water.

Just as the pump is turned  on, 
the liquid in the suction 
chamber is sucked up, as the 
rotational movement creates 
a stronger vacuum seal.

All of the air in the main body of 
the pump is discharged and will 
allow normal smooth operation.  
Should even a little amount of air 
enter, it will be discharged 
without causing any operational 
difficulty.

When the pump is stopped, the 
siphon cut hole will minimize 
the liquid backflow and secure 
enough liquid in the suction 
chamber for the next prime.

Содержание YD-25NSF

Страница 1: ...YD 25NSF YD 40NSF YD 50NSF Version WCA 0202 INSTRUCTION MANUAL SELFREE SEALLESS VALVELESS SELF PRIMING PUMP NON METALLIC CARBON FIBER REINFORCED POLYPROPYLENE...

Страница 2: ...or bearing This manual will explain how operate and maintain your pump properly Please read it to effectively use your pump for an extended period HANDLING UPON RECEIPT PREFACE FEATURES 21 THE PRINCI...

Страница 3: ...ion Non compliance can lead to some injury and or property damage This symbol indicates a warning or precaution This symbol indicates a required action This symbol indicates a prohibited action Do not...

Страница 4: ...the pump in accordance to its specifications Do not damage modify or stretch the power cord Heating or placing heavy objects on the cord will damage it causing fire and or electric shock Do not modif...

Страница 5: ...quality resin construction CFR PP CFR PVDF The entire pump and its component parts are flawless molded with an all resin construction The pump s stability and quality are assured even in the harshest...

Страница 6: ...priming chamber guided by the impeller after the pump is turned on In the self priming chamber the air and water separate as they rotate The water is propelled into the impeller as it leaves the self...

Страница 7: ...3 EXAMPLES OF USE Pumping transport from a drainage tank or a chemical tank 2 Transferring circulating high temperature plating liquid to a filtering tank 1 WARNING THIS USE NOT APPLICABLE...

Страница 8: ...4 SPECIFICATION AND PERFORMANCE CURVES...

Страница 9: ...5 DIMENSIONAL AND PARTS DRAWING Note Marked dimension varies depending on the motor size...

Страница 10: ...Impeller with Sleeve O ring Casing Assembly Pump Base Motor Oil Seal Motor Bracket Impeller Locking Sleeves Overflow Pipe O ring Pump Body O ring Casing Assembly Drain Plug Packing Pump Body Seal Case...

Страница 11: ...3 CFRPP Casing 12 FPM Packing for drain priming plug 11 CFRPP Drain plug 10 CFRPP Impeller with sleeve 9 PPS Impeller locking sleeves 8 FPM O ring 7 CFRPP Cleaning plug 6 CFRPP Pump body 5 CFRPP Primi...

Страница 12: ...mp and casing to be distorted and or damaged by heat To prevent the self priming capacity from lowering it is necessary to have a vertical pipe longer than 3 3 ft 1 m attached to the outlet with a byp...

Страница 13: ...at room temperature Check Valve Approx 3 3 ft 1 m d A 11 5 ft 3 5 m YD 50NSF 9 8 ft 3 0 m YD 40NSF 8 2 ft 2 5 m YD 25NSF A 3 The limit of the suction height self priming capacity assumes that the suct...

Страница 14: ...e o rings to the pump flange Installation of the flange to the pump body Installation of the discharge elbow to the pump body Installation of the motor assembly to the pump body Installation of the im...

Страница 15: ...aft run out is within 50 micrometer As the pictures shown below install the joint shaft to the motor and check the shaft run out the dial gauge Assemble the motor bracket to the motor by bolts When yo...

Страница 16: ...ber portion must be turned Pump Body Assembly Installation of the o rings to the pump flange Place the following four o rings onto each specified place on the pump upper flange O ring for the priming...

Страница 17: ...he direction of each part Pump body Pump Body Assembly Installation of the discharge elbow to the pump body The pump body is put on the pump upper flange with o rings Weight the pump body for a certai...

Страница 18: ...l adjustment Bolt with washer and nut with spring washer and washer Bolt size M10x65 Nut sieze M10 Pump Body Assembly Installation of the impeller to the pump body Put the dry seal to the impeller up...

Страница 19: ...7 21 mm 3 Measure a distance of Z from the top of the casing to the bottom of the casing Z measures as 0 858 21 8 mm 4 The GAP calculation between the impeller and the casing GAP Z Y 0 032 0 8 mm MUST...

Страница 20: ...Place an o ring onto the o ring groove on the casing Pump Body Assembly Installation of the pump casing to the pump body 1 Place the casing with o rings onto the pump body and fasten them with slotte...

Страница 21: ...to the pump casing 3 Install the priming plug with a packing to the pump 1 Place the pump base on the pump and fasten them with hex bolts and nuts ORDER OF DISASSEMBLY Disassemble the pump in the rev...

Страница 22: ...sure switch Improper insulation Burn out of the motor Damage to the motor bearing Rotate only the motor manually If it is heavy it is out of order Rotate only the pump manually Unable to start 1 Defec...

Страница 23: ...n the suction pipe 1 Liquid is easily to foam 2 Liquid temperature and its specific gravity are over its maximum permissible limit 3 Strainer foot valve and impeller are clogged with foreign particles...

Страница 24: ...tion Check the vibration or noise source Inside the pump Motor Bearing Piping and valve section Foundation section Low suction pressure due to excess suction lift Cavitation Foreign particles in sucti...

Страница 25: ...omer and the manufacturer Travel expenses for non warranted repair service to a remote location will be the responsibility of the customer 6 Damages and costs of damages incurred as a result of pump f...

Страница 26: ...When ordering replacement or spare parts please provide the part names part numbers and material listed in the table on page 7 When requesting repair service please provide us with the following infor...

Страница 27: ...E mail wcusa worldchemicalusa com Website http www worldchemicalusa com North South America Tousen Higashi Azabu Bldg 7th Floor 1 5 2 Higashi Azabu Minato ku Tokyo 106 0044 Japan TEL 03 3588 1140 FAX...

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