Related Manuals for BS&B 6400
Summary of Contents for BS&B 6400
- Page 1 INSTRUCTIONS AND MAINTENANCE MANUAL SAFETY VALVES MODELS 6400 MA-64/07 NOVEMBER 2020...
- Page 2 VALVULAS NACIONAL, S. A. recommends you read this Instructions Manual carefully, where you can find the minimum precautions to be taken into consideration before the installation of the safety valves to ensure their correct operation. VALVULAS NACIONAL, S. A. guarantees its safety valves against all kind of manufacture flaws for a 12-month period from their installation or maximum 18 months after their delivery, whichever occurs first.
- Page 3 MAIN DEFINITIONS (UNE-EN ISO 4126-1) Safety valve: Valve which automatically, without the assistance of any energy other than that of the fluid concernet, discharges a quantity of the fluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-close and prevent further flow of fluid after normal pressure conditions of service have been restored.
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Page 4: Table Of Contents
CONTENTS PAGE 1 - INTRODUCTION 2 - DESCRIPTION 3 – TRANSPORTATION AND STORAGE 4 – INSTALLATION 4.1 – HYDROSTATIC TEST OF INSTALLATION 5 – MODIFICATION OF SET PRESSURE AND BLOWDOWN 5.1 – SET PRESSURE MODIFICATION 5.2 – BLOWDOWN ADJUSTMENT 6 – MAINTENANCE 6.1 –... -
Page 5: Introduction
If this is not The model 6400 safety valves are safety devices whose possible, the valve must be appropriately protected to main function is to protect all kinds of pressurised prevent from deterioration. -
Page 6: Hydrostatic Test Of Installation
recipient. This prevents the accumulation of water, The bellows valves have a screwed orifice on the corrosive liquids, contaminants and other products that bonnet (vent) which must be in contact with the might deteriorate the internal parts of the valve. See atmosphere (Figure -1). -
Page 7: Modification Of Set Pressure And Blowdown
spring and increase the blow-down, which means that it is more difficult for the valve to close after it has opened. Before increasing the set pressure of an installed valve, make sure that the new pressure is within the nominal pressure range for which it has been designed. -
Page 8: Maintenance
6 - MANTEINANCE If the valve has been operating on an installation with fluids classified as dangerous or contaminant, it must be decontaminated before it is touched. It is extremely important to follow the disassembly instructions in order as follows, otherwise it may be dangerous for the worker who manipulates the valve, owing to the spring stress. -
Page 9: Assembly And Disassembly Of The 64Gf, 64Lf, 64Gp And 64Lp Valve Models
Replace all the gaskets. The reuse of them can lead to In bellows-disc holders up to orifice “J”, which are of one malfunctions, such as leaks, connected chambers and single component, take special care not to damage the variations in the opening lift. bellows when assembling the disc in the disc holder. -
Page 10: Assembly
remove the packing (42) from the casing. Pull on the shaft, taking into account that the cam (37) will come loose inside the cap. 6.3.2 ASSEMBLY Once the parts have been checked and cleaned, begin the assembly inserting the cam (37) inside the cap (39), fit the shaft (43) in position by inserting the cam. - Page 11 CONVENTIONAL SAFETY VALVES MODELS 64GC AND 64LC Nº PART NAME Nº PART NAME BODY ELASTIC RING BONNET PLUG ELASTIC PIN NOZZLE LOCK STUD DISC GASKET GUIDE PLUG ADJUSTING RING STUDS DISC HOLDER STEM SCREW SPRING GASKET ADJUSTING SCREW GASKET PUSH ROD GASKET GASKET LOCK SCREW...
- Page 12 BALANCED SAFETY VALVES (BELLOWS) MODELS 64GF AND 64LF Nº PART NAME Nº PART NAME BODY ELASTIC RING BONNET PLUG ELASTIC PIN NOZZLE LOCK STUD DISC GASKET GUIDE PLUG ADJUSTING RING STUDS DISC HOLDER STEM SCREW SPRING GASKET ADJUSTING SCREW GASKET PUSH ROD GASKET GASKET...
- Page 13 BELLOWS-PISTON SAFETY VALVES MODELS 64GP AND 64LP Nº PART NAME Nº PART NAME BODY PLUG BONNET ELASTIC PIN LOCK STUD NOZZLE GASKET DISC PLUG GUIDE STUDS ADJUSTING RING DISC HOLDER SCREW STEM GASKET SPRING GASKET ADJUSTING SCREW GASKET PUSH ROD GASKET BELLOWS LOCK SCREW...
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Page 14: Reconditioning Of Closing Surfaces
6.4 RECONDITIONING OF CLOSING SURFACES. The most important basic conditions for obtaining a good The perfect tightness of the safety valve depends largely final result in the lapping process are: on the condition of the closing surfaces, the contact surfaces between the nozzle (4) and the disk (5). A) Flat surface for supportting the lapping plate. -
Page 15: Gases And Vapours
GASES AND VAPOURS Test (B) requires a larger container to prevent damage to the closing surfaces and greater care must be taken If a valve test bench is not available, the pressure when fastening the valve. adjusting test may be performed using a pressurized reservoir (bottle) with air or nitrogen, if possible, with a LIQUIDS good shock-absorbing “mattress”... -
Page 16: Adjusting Ring Position
Examples of the calculation of the cold differential test tightened, make sure the ring is fixed so that it does not pressure with regard to backpressure and temperature: turn but is free for self-alignment. DATA: Conventional valve (without bellows), set It may be necessary to readjust the blowdown once the pressure 20 bar, operating temperature 260ºC and valve has been fitted since, depending on the product,... -
Page 17: Tightness Test With Water
not exceed 10 cm³/h for every 25 mm nominal diameter of the valve (API-RP 527). 8.3 EXCESSIVE LEAK If the tightness test has been performed correctly and it Tubo de Ø 6 x 8 mm gives a result of excessive leakage, remove the valve to check that there is no dirt or foreign bodies between the nozzle and the disk. -
Page 18: Table Of Possibles Anomalies And Solutions
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 maintenance create a plastic insulation on the valve that favours the accumulation of static electricity which, if not eliminated correctly, can produce radiant discharges that could lead to ignition. - Page 19 FAILURE POSSIBLE CAUSE SOLUTION Perform one or two pops and check. If there is a leak Dirt between nozzle and disc. again, internal components should be disassembled and cleaned. Marked or scratched closing Disassemble valve and lap nozzle and disc. surfaces.
- Page 20 NOTES For valves with BW connections applied as indicated in the document except that where indicated inlet or outlet flange should be understood as BW inlet or outlet connection respectively.
- Page 21 Compositor Vivaldi, 2- 8 Polígono Industrial Can Jardí P.O. Box 123 08191 Rubí – Barcelona Tel.: 0034 936 995 200 / 0034 936 995 150 Fax: 0034 936 974 556 e-mail: comercial@valvulasnacional.com...