background image

 

 
 
 
 

 

 

 

 

QM-Nr: FB_BMA_01-R-0804engl_3 

Erstellt/ 

Prepared

: am/ 

on:19/11/2015 

Genehmigt/ 

Approved: am

/

on19/11/2015

 

15 / 16 

 

 

 

 by ROFI S.A.R.L. 

7.  Troubleshooting table 

 

Fault 

Possible cause 

Corrective measures 

No flow 

Flange covers have not been removed 

Remove flange covers 

Flow too low 

Piping clogged 

Check piping system 

Flange broken between unit 
and piping 

Bolts tighten unevenly 
Mating flanges not properly aligned 

Re-align piping and fit new valve. 

Relief the pressure in the system first !

 

Leaks across the gate 

Solid particles in the medium 
 
Deformation of the seat faces due to 
excessive tightening of the valve or due 
to thermal stress  
 
Erosion or corrosion caused for instance 
by incorrect selection of valve size or 
material 

Re-grind seats, use spare parts  

only 

by qualified personnel ! 

 

Leaks through Bonnet and 
Flange 

Extreme temperature fluctuation or 
vibration 
 
Excessive pressure stresses on the 
Bonnet Flange bolting 
 
Inadequate maintenance 
 
External influences 
 
Failure of seal as result of insufficient 
resistance to temperature or medium 
 
 

Re-tightening of connection bolts 
 
Replacement of the seal 

Leaks through gland 

Inadequate maintenance 
 
Wear of packing material 
 
Failure of gland caused by the use of a 
packing material without sufficient 
resistance to temperature of the medium.

 

 

Retighten, repack or replace packing

 

 

Failure of actuators 

Please see and check the manual of the 
manufacturer 

For causes of trouble and remedial action, refer 
to the manual supplied by the actuator 
manufacturer. We strongly recommend that limit 
switches or torque limiters are reset by properly 
skilled personnel only.

 

 

 
 

Содержание ROFI

Страница 1: ...e transport and storage 7 3 1 Transport 7 3 2 Storage 7 4 Details on safe installation 7 4 1 Planning and installation 8 4 1 1 Installing position 9 4 1 2 Spindle operated Valves 9 4 1 3 Non return Va...

Страница 2: ...2015 2 16 by ROFI S A R L Content Page 5 7 Checking during and after first operation 12 6 Maintenance 13 6 1 Gland packing Bonnet flange seals and Replacement 13 6 2 Recommended lubricants 14 6 3 Lubr...

Страница 3: ...peration load stressing disintegration pressure of unstable fluorides etc If the purchaser expects stresses deviating from the normal operating conditions he has to indicate these requirements unambig...

Страница 4: ...sonnel 2 General Information The design of the valve depends upon the use and is beneath the responsibility of the buyer With the application for mediums and temperatures which differ from the type de...

Страница 5: ...rective 94 9 EG with the EX mark we declare the conformity with the ATEX Directive 94 9 EG for the use in hazardous areas 2 2 Notes on possible dangers 2 2 1 Significance symbols and explanatory notes...

Страница 6: ...be used with fluids which doesn t cause any explosive mixture or atmosphere in the interior Attention Refer to the data sheet for applications limits on use and possibilities Certain media require or...

Страница 7: ...ns 3 2 Storage On site the valves must be stored so as to be protected against mechanical damage and or corrosion The preferable storage condition is in closed rooms with ambient temperature Flanges o...

Страница 8: ...alings are centred at the joining flanges The pipe relaying is to be done in such a way that harmful thrusts and bending stresses will be kept away from the body While coating the plant gland bolt nut...

Страница 9: ...ng device which are fitted in a non horizontal piping it should be assured by reconstruction that the closing or damping device action is not disturbed Swing check valves with outside control mechanis...

Страница 10: ...re machining chips and other foreign matter must be carefully removed The pipe ends must be properly aligned so as to prevent the valve being subjected to unnecessary strain Bricklaying or painting sh...

Страница 11: ...he specific torques of electric actuators normally are set in the factory The closing of ROFI valves is controlled by torque switches eventually additionally secured by limit switches Opening of the v...

Страница 12: ...worn This is also recommended when operating valves where leaks can allow hazardous media e g steam acids to escape Hand wheels of electric actuators are for emergency operation only they are disengag...

Страница 13: ...he position of the valve within the plant configuration the medium operating cycle temperature change loadings and so forth The user should call upon his experience as plant operator to specify inspec...

Страница 14: ...ration cycle its ambient conditions pollution temperature and the influence of the valve heat on the grease point The spindle thread should first be cleaned if heavily soiled and the gland area protec...

Страница 15: ...e size or material Re grind seats use spare parts only by qualified personnel Leaks through Bonnet and Flange Extreme temperature fluctuation or vibration Excessive pressure stresses on the Bonnet Fla...

Страница 16: ...ase Order Number under which the valve was first supplied 9 Guarantee Warranty The extent and period of warranty cover are specified in the Standard Terms and Conditions of ROFI S A R L valid at the t...

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