BS&B NACIONAL 3-5111 Instruction And Maintenance Manual Download Page 1 | Manualshive

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INSTRUCTIONS AND MAINTENANCE MANUAL

SAFETY AND RELIEF VALVES

MODELS 3-5111 AND 3-5161

MA-51/04

NOVEMBER 2020

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Summary of Contents for NACIONAL 3-5111

Page 1: ...INSTRUCTIONS AND MAINTENANCE MANUAL SAFETY AND RELIEF VALVES MODELS 3 5111 AND 3 5161 MA 51 04 NOVEMBER 2020...

Page 2: ...inlet static pressure at which the disc re establishes contact with the seat or at which the lift becomes zero Cold differential test pressure The inlet static pressure at which a safety valve is set...

Page 3: ...onsideration before the installation of the safety relief valves so they work correctly VALVULAS NACIONAL S A warrantees their safety relief valves against all kind of manufacture flaws for a 12 month...

Page 4: ...e checked to ensure that it s the proper valve The seal cannot be broken otherwise the set pressure and tightness will have to be checked again The valve has to be perfectly clean and no kind of dirt...

Page 5: ...ring 7 Using a screwdriver turn the adjusting ring upwards until making contact with the disc holder 8 then turn it to the opposite direction so many grooves as Table 1 points out In order to increase...

Page 6: ...wed hole from the bonnet venting is not covered This is mandatory for the good performance of the valve 5 3 RECONDITIONING THE CLOSING SURFACES When the contact surface between nozzle and disc the val...

Page 7: ...EVER 7 ADJUSTING RING 30 GUIDE GASKET 62 CAM SHAFT SUPPORT 8 DISC HOLDER 31 CAP GASKET 63 CAM SHAFT RETAINER 9 STEM 33 BELLOW 64 GASKET 10 SPRING 43 RELEASE NUT 65 PIN 11 ADJUSTING SCREW 44 BOLT 59 56...

Page 8: ...adjusting ring has to be placed touching the disc holder s bell then it has to be lowered one or two grooves If the test if correctly done the results of both tests will be practically identical Test...

Page 9: ...e adjustment for the valve to be adjusted at the bench will be 50 barg 1 barg 51 barg Is important to notice that in all cases as it s been shown in examples A and B temperature used for calculations...

Page 10: ...uld be dangerous for anyone handling the valve 7 1 EXCESSIVE LEAK If the tightness has been correctly performed and the result is excessive leaks the valve has to be disassembled to verify that there...

Page 11: ...as a high risk source of ignition c It is essential to make sure that the valve is not insulated from the earth connection of the installation since the different layers of paint resulting from its m...

Page 12: ...nt pressure than the one it has been adjusted Built up back pressure In conventional valves check that the adjusting ring has the same size or bigger tans the outlet connection of the valve and or the...

Page 13: ...Vivaldi 2 8 Pol gono Industrial Can Jard Apdo Correos 123 08191 Rub Barcelona Tel 34 936 995 200 34 936 995 150 Fax 34 936 974 556 e mail comercial valvulasnacional com...

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