KNF NF 2.35 Operating And Installation Instructions Download Page 15

Diaphragm liquid pump NF 2.35 

Servicing 

KNF Flodos AG BA_NF2-35_EN_02_164912 
Translation of original Operating and Installation Instructions

 

15 

8.  Servicing 

8.1.  Servicing schedule 

Component 

Servicing interval 

Pump 

-

 

Regular inspection for external 
damage or leaks 

Pump head 

-

 

Clean if the flow rate decreases, the 
pump does not work or no vacuum 
is created (Chapter 8.2) 

Diaphragm, valve 
plates and seals  

-

 

Change as soon as pumping capac-
ity decreases, preferably sooner 

Filter (accessory) 

-

 

Change if it is dirty 

Tab. 8 

8.2.  Disassemble pump head 

 

WARNING 

 Health hazard due to dangerous 

substances in the pump 
Depending on the medium transferred, caustic burns 
or poisoning are possible. 

  Wear protective clothing if necessary, e.g. pro-

tective gloves. 

  Flush the pump with a neutralising liquid and 

pump empty. 

 

8.2.1. Preparations for disassembly 

1.  Flush the pump with a suitable neutralising liquid, and make 

sure that no dangerous substances are left in the pump 

2.  Empty the pump 

3.  Separate electrical connections 

4.  Disconnect hoses from pump head 

Qty 

Tool  

T10 Torx screwdriver  

Tab. 9 

Information on procedure 

Tool 

Summary of Contents for NF 2.35

Page 1: ...de is a coun try specific designation with no technical relevance Contents Page 1 About this document 2 2 Use 3 3 Safety 4 4 Technical data 6 5 Assembly and function 8 6 Installation and connection 9...

Page 2: ...markings Warning WARNING This symbol indicates a potential danger It also indicates the possible consequences of failure to observe the warning The signal word e g Warn ing indicates the level of dang...

Page 3: ...n the permissible temperature range see Chapter 4 The transferred medium should not contain particles as these can prevent the pump from working correctly If this cannot be guaran teed a filter 50 m w...

Page 4: ...and Installation Instructions and in particular the Safety chapter Always ensure adherence to all pertinent accident prevention and safety regulations when working on and operating the pump When trans...

Page 5: ...ed as not ready for use Partly completed machinery may not be commissioned until such time as it has been determined that the machine in which the partly completed machinery is to be assem bled confor...

Page 6: ...PTFE Resonating diaphragm PTFE Tab 3 1 according to DIN ISO 1629 and 1043 1 2 The pump head comprises an intermediate plate and a connecting plate Hydraulic ratings Parameter Value PN nominal pressure...

Page 7: ...0 46 1 1 0 44 Protection class IP50 Weight g 1 260 Tab 6 1 The weight may differ slightly from the stated value depending on the version Electrostatic sensitive components ESD Other parameters Paramet...

Page 8: ...alve 3 Working chamber 4 Diaphragm 5 Eccentric 6 Connecting rod 7 Pump drive Fig 2 Pump assembly The diaphragm liquid pumps are based on reciprocating displace ment pump technology The elastic diaphra...

Page 9: ...instructions Before installation store the pump at the installation location to bring it up to ambient temperature Mounting dimensions see Fig 3 and 4 Fig 3 Mounting dimensions NF 2 35 DCB B Fig 4 Mou...

Page 10: ...connect the pump when the power supply is disconnected When connecting the device to a power source the applicable norms directives regulations and technical standards must be observed Connecting the...

Page 11: ...ilitate the priming process Check that the hoses and transition joints are fitted correctly and securely Check that the system is leak tight WARNING The bursting of unprotected parts of the system may...

Page 12: ...rvicing it is recommended to use a new head plate with new rubber part to ensure continued maximum leak tightness Service Kit Pump Head NF 2 35 XP item no 165 704 NF 2 35 XT item no 165 705 Plug in co...

Page 13: ...g excessive pressure and the inherent dangers thereof is to place a bypass line with a pressure relief valve between the pressure and suction sides of the pump For further information contact your KNF...

Page 14: ...lev el If you experience a brief power interruption check for the presence of pressure or vacuum before restarting For more specific information contact your KNF technical adviser Switching off the pu...

Page 15: ...erably sooner Filter accessory Change if it is dirty Tab 8 8 2 Disassemble pump head WARNING Health hazard due to dangerous substances in the pump Depending on the medium transferred caustic burns or...

Page 16: ...in pump housing Screw diaphragm 11 with washer 12 into connecting rod Make sure that no washers 12 fall into the pump housing Fully tighten the diaphragm by hand Place O rings 8 and anchor valves 9 i...

Page 17: ...alve plates or seals are worn Replace diaphragm valve plates and seals see Chapter 8 2 Replace pump Tab 10 Pump is not priming Possible cause Fault remedy Suction side of pump not con nected Connect t...

Page 18: ...the pump head install suction side filter if required see Chapter 8 2 Viscosity of the transferred medium is too high Contact KNF Incorrect interchange of pres sure and suction line connec tions Remo...

Page 19: ...n that the customer provides certification of the transferred media and the cleaning of the pump decontamination declaration In order to send a product back use the decontamination declaration which e...

Page 20: ...KNF worldwide Please find your local KNF partners at www knf com...

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