Related Manuals for BS&B NACIONAL 3-5111
Summary of Contents for BS&B 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 MAIN DEFINITIONS (UNE-EN ISO 4126-1) Safety valve: Valve which automatically, without the assistance of any energy other than that of the fluid concerned, 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.
-
Page 3: Table Of Contents
INDEX PAGE 1 – INTRODUCTION 2 – TRANSPORTATION AND STORAGE 3 – INSTALLATION 4 – ADJUSTING THE SET PRESSURE 4.1 – HYDROSTATIC TESTS 4.2 – BLOW-DOWN ADJUSTMENT 5 – MAINTENANCE 5.1 – ASSEMBLY AND DISASSEMBLY - VALVE 3-5111 5.1.1 – DISASSEMBLY 5.1.2 –... -
Page 4: Introduction
1 - INTRODUCTION be seen inside the nozzle or inside the valve, if deemed necessary, a blowing should be performed. The purpose of this manual is to offer all suitable The pipe, the connection flanges and the valve holders information for a correct installation and maintenance must be conscientiously clean. -
Page 5: Hydrostatic Tests
If a valve is set to a higher pressure than the original - Using a screwdriver turn the adjusting ring upwards set pressure, the rupture of the spring could occur and until making contact with the disc holder (8), then turn a reduction of the distance between the spring coils, it to the opposite direction so many grooves as Table 1 limiting the valves opening, and therefore, the relief... -
Page 6: Assembly
Once disassembled the bonnet (2) from the body (1), Make sure that the screwed hole from the bonnet the spring (10) can be removed together with the (venting) is not covered. This is mandatory for the spring button (15). good performance of the valve. 5.3 RECONDITIONING THE CLOSING SURFACES Never perform this operation unless there is full When the contact surface between nozzle and disc... - Page 7 3-5161 MODEL 3-5111 MODEL VENT CONVENTIONAL VALVE BALANCED VALVE SCREWED CONNECTION LIFTING LEVER Nº DESCRIPTION Nº DESCRIPTION Nº DESCRIPTION BODY PACKED CAP BONNET LOW SCREW STEM SPRING BUTTON CAM SHAFT NOZZLE DISC RETAINER PACKING DISC NOZZLE GASKET PACKING GLAND GUIDE SCREW GASKET LEVER ADJUSTING RING...
-
Page 8: Adjusting The Set Pressure At The Test Bench
6 – ADJUSTING THE SET PRESSURE AT It is necessary to perform a good blowing of the connections and pipes. This has to be done prior THE TEST BENCH to the placement of the valve, in order to avoid any dirt that could damage the closing zones. -
Page 9: Position Of The Adjusting Ring
WORK TEMPERATURE INCREASE TO THE SET Cold set pressure adjustment for the valve to be PRESSURE adjusted at the bench will be: UNTIL 100º C 50 barg + 1 barg = 51 barg FROM 101º C TO 250º C FROM 251º C TO 500º C MORE THAN 500º... -
Page 10: Tightness Test
While performing this test, special attention has to 7 - TIGHTNESS TEST be taken as the risk of any unforeseen popping exists due the test is done to conditions very close to the set pressure, which could be dangerous for The tightness test will be done after adjusting the set anyone handling the valve. -
Page 11: Safety Recommendations
9.1 SAFETY RECOMMENDATIONS To avoid the risk of ignition, bear in mind the following points: a) Prevent dust from accumulating on the valve casing. b) It is absolutely important to keep the protective painting on the casing in good condition, owing to the fact that, if there is any friction or shock, the oxide would act as a high-risk source of ignition. - Page 12 TABLE 1: POSITION OF THE ADJUSTING RING ( NOTCH NUMBER CORRECTION FROM THE CONTACT WITH THE DISC HOLDER ) SAFETY VALVES 3-5111 Y 3-5161 SET PRESSURE Bar g. ORIFICE > 0,5 > 2,5 > 6 > 10 > 16 > 25 >...
- Page 13 Vivaldi 2-8 Polígono Industrial Can Jardí Apdo. Correos 123 08191 Rubí – Barcelona Tel.: +34 936 995 200 / +34 936 995 150 Fax: +34 936 974 556 e-mail: comercial@valvulasnacional.com...