LTG3 Globe Control Valves Standard Trim

Transcription

1 A Long Experience in Energy Equipment and one Goal: The Customer s Satisfaction. LTG3 Globe Control Valves Standard Trim Doc. num. G03STT rev.1

2 TABLE OF CONTENTS LTG3 - LTG3 LN - LTG3 DS : GENERAL FEATURES... 3 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - PART LIST... 5 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - BASIC MATERIAL CLASSES... 6 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - TRIM CLASSES... 7 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - SEAL RING LTG3 - LTG3 LN - LTG3 DS : SOFT SEAT - PART LIST & BASIC MATERIAL CLASSES LTG3 - LTG3 LN - LTG3 DS : PACKING - PART LIST & BASIC MATERIAL CLASSES LTG3 : CV & SIZING FACTORS, linear characteristic for general service LTG3 : CV & SIZING FACTORS, equal% characteristic for general service LTG3 LN : CV & SIZING FACTORS, linear characteristic for low noise application LTG3 LN : CV & SIZING FACTORS, equal% characteristic for low noise application LTG3 DS : CV & SIZING FACTORS, linear characteristic for incompressible fluid LTG3 DS : CV & SIZING FACTORS, linear characteristic for compressible fluid LTG3 - LTG3 LN - LTG3 DS : DIMENSIONS AND MASSES

3 LTG3 - LTG3 LN - LTG3 DS : GENERAL FEATURES - cage guided design according to the following characteristics: LTG3 - single cage with standard drilled cage for general purpose application LTG3 LN - single cage with special drilled cage for low noise application on compressible fluids LTG3 DS - double cage for severe applications on compressible / incompressible fluids - flow direction flow to open as per Valvitalia standard design flow to close as a special design in case of flashing / cavitation, to be designed on request - maintenance : quick change design, seat ring clamped into the body by the cage (with throttling function) Body: - material : see table 3 - body rating and type Valve size All 3/4 to 2 3 to to 20 Class 150 according to ANSI Casted body (1) Forged body (2) FF flanged Socket weld (5) Threaded (6) Casted body (1) Forged body (2) FF flanged Casted body (1) Forged body (2) FF flanged Table 1 - Body rating and classes Class according to ANSI Casted body (1) Forged body (2) FF flanged RTJ flanged (3) Socket weld (5) Threaded (6) Casted body (1) Forged body (2) FF flanged RTJ flanged (3) Casted body (1) Forged body (2) FF flanged RTJ flanged (3) Class according to ANSI Casted body (1) Forged body (2) RTJ flanged (3) Casted body (1) Forged body (2) RTJ flanged (3) Casted body (2) Forged body (1) RTJ flanged (3) Class 2500 according to ANSI Casted body (2) Forged body (1) RTJ flanged (3) Casted body (2) Forged body (1) RTJ flanged (3) Casted body (2) Forged body (1) RTJ flanged (3) PN according to DIN EN Casted body (1) Forged body (2) Type A flanged Type B1 flanged Type B2 flanged Type E flanged Type F flanged NOTES (1) standard solution (2) optional (3) where RTJ flange is foreseen, also the following type of flanges can be available: - SMF, small male face - LMF, large male face - SFFF, small female face - LFF, large female face - STF, small tongue face - LTF, large tongue face - SGF, small grove face - LGF, large groove face (4) Butt weld connection according to ANSI B16.25 (5) Socket weld connection according to ANSI B16.11 / B36.10 (6) Threaded connection according to ANSI B

4 - face to face dimension : according to IEC for ANSI up to DN16 according to ANSI/ISA for ANSI up to DN16 according to DIN for size greater than DN16, see table 16 according to ASME B16.10 long pattern, to be designed on request (in this case a forged body will be foreseen, see table 1) other, to be designed on request (in this case a forged body will be foreseen, see table 1) Bonnet: - material : see table 3 - dimension : standard bonnet, flanged to body for temperature higher than -46 C low temp. extended bonnet for temperature -46 C / -100 C cryogenic bonnet for temperature -101 C / -196 C high temp. Extended bonnet for temperature above +400 C see table 16 Trim: - Type : cage guided with unbalanced plug up to DN40 cage guided, unbalanced or balanced plug as per standard solution from DN50 to DN80 cage guided balanced for port dimension higher than DN80 (unbalanced if imposed by process conditions) - Sealing : Seat sealing : metal to metal or soft seat, see table 6 and Fig.3 for limitations Cage sealing : depending on leakage class required, see table 5 for limitations - material : see tables 3 and 4 - maximum applicable pressure drop : see table 4 - Characteristic : linear or equalpercentage, see tables from 8 to 15 Packing: - Type : see table 7 - material : see tables 3 and 7 - for temperature and pressure capability : see table 7 Leakage Class (according to IEC ) : - standard : IV and V - optional: VI, see technical bulletin ACTUATOR SELECTION for LTG3 (doc. no.g03acs), seal ring table 5 and table 6 Rangeability: - Cvmax/Cvmin (values from Cv table): better than 50:1 for 1" port and over 4

5 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - PART LIST (1) Fig.1 LTG3 standard design, part list Table 2 - Main components part list NOTES (1) see table 5 (2) stem connector design depend on actuator type. Stem connector on the right refers to a stem connector for actuators without handwheel Stem connector on the left refers to a stem connector for actuators with handwheel 5

6 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - BASIC MATERIAL CLASSES Table 3 - Basic material classes NOTES (1) All the basic material classes can be manufactured according to NACE requirements Example : BC1 - basic class no.1 BC1N - basic class no.1 according to NACE (2) forged bonnet for 3/4, 1 and 1 1/2 for all ratings (3) on request - standard for offshore application or installation in very corrosive environment (4) TC7 replaces TC1 and TC4 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (5) TC8 replaces TC2 and TC5 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (6) TC9 replaces TC3 and TC6 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) 6

7 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - TRIM CLASSES Table Trim material classes 7

8 Table Trim material classes 8

9 Table Trim material classes NOTES (1) double certified (2) in case of high strength stem requirement for medium temperature (3) in case of high strength stem requirement for high temperature (4) in case of high operative temperatures or high pressure drop (5) TC7 replaces TC1 and TC4 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (6) TC8 replaces TC2 and TC5 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (7) TC9 replaces TC3 and TC6 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (8) TC10H replaces TC3 and TC6 in case of hard trim requirement for valve with port lower than ½ (in this case stellite overlay is not possible) (9)Full stellite Gr.6 in case of NACE requirement (10) maximum pressure drop reducing coefficient for taking into account high temperature services 9

10 LTG3 - LTG3 LN - LTG3 DS : MAIN COMPONENTS - SEAL RING Pressure energized teflon seal ring Pressure energized teflon based seal ring TFE and resilient inner seal ring Metal seal ring and Inner metal spring Note: to obtain class IV two seal rings are fitted into the plug Metal seal ring and graphite inner seal ring Metallic ring and V-ring Table 5 Seal ring 10

11 LTG3 - LTG3 LN - LTG3 DS : SOFT SEAT - PART LIST & BASIC MATERIAL CLASSES Fig.3 Pressure / temperature rating Fig.2 Soft seat Table 6 - Soft seat part list & basic material classes NOTES (1) IEC foresees only soft seats to reach class VI (zero leakage). In case of metal to metal seat design, reference is made to DIN according to this standard and basing on our experience, class VI can be reached with a seat load of 500N/mm. Class VI can be compared with ISO 5208 rate A (no visible leakage) (2) Also soft insert can guarantee class VI if combined with a balanced plug if insert (31) is used 11

12 LTG3 - LTG3 LN - LTG3 DS : PACKING - PART LIST & BASIC MATERIAL CLASSES Fig.4 - Standard packing design type A Table 7 - Packing material classes NOTES (1) 250 bar is the maximum working pressure in case of live loading design (type C) 400 bar is the maximum working pressure in case of standard and leak-off design (type A and B) (2) For working temperatures lower than -30 C, an extended or cryogenic bonnet shall be foreseen (3) In case of temperature higher than 200 C, if a teflon based packing is required an extended bonnet shall be designed (on request). (4) No practical limit is given. When used on superheated steam the maximum temperature can be assumed +600 C (5) low emission packing according to ISO15848 class B. (6) VLT packing rings do not require lubrication Material class PP Standard for medium temperature and pressure, guarantee the lowest frictions. Suitable for vacuum service since the seal rings are symmetrically shaped Fig.5 - Leak-off packing design type B Material class PL Standard for medium temperature and pressure, in case of gas applications (no steam). Suitable for vacuum service since the seal rings are symmetrically shaped. O-ring addiction improves the low emission characteristics (SEE NOTE 5) Material class PG Standard for high temperature and pressure. Suitable for vacuum service since the seal rings are symmetrically shaped. Fig.6 - Live loading packing design type C 12

13 LTG3 : CV & SIZING FACTORS, linear characteristic for general service Flow characteristic: Linear Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 Pressure recovey factor FL Pressure diff. ratio factor x T (for compressible fluid) Valve cavitation index x fz (for incompressible fluid) Sigma valve σ v (for incompressible fluid) Valve style modifier F d (for compressible fluid) Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ /2 1'' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 8 - CV & SIZING FACTORS, linear characteristic for general service 13

14 LTG3 : CV & SIZING FACTORS, linear characteristic for general service Flow characteristic: Equal percentage Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 Pressure recovey factor FL Pressure diff. ratio factor x T (for compressible fluid) Valve cavitation index x fz (for incompressible fluid) Sigma valve σ v (for incompressible fluid) Valve style modifier F d (for compressible fluid) Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ /2 1'' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 9 - CV & SIZING FACTORS, equal% characteristic for general service 14

15 LTG3 LN : CV & SIZING FACTORS, linear characteristic for low noise application Flow characteristic: Linear Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 1 1/ Pressure recovey factor FL Pressure diff. ratio factor x T Valve style modifier F d See table 11 Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ '' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 10 - CV & SIZING FACTORS, linear characteristic for low noise application Percent of Travel 5% 10% 20% 40% 60% 80% 100% Port Fd 3/ / Table 11 - Fd factor, linear characteristic 15

16 LTG3 LN : CV & SIZING FACTORS, equal% characteristic for low noise application Flow characteristic: Equal percentage Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 1 1/ Pressure recovey factor FL Pressure diff. ratio factor x T Valve style modifier F d See table 13 Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ '' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 12 - CV & SIZING FACTORS, equal% characteristic for low noise application Percent of Travel 5% 10% 20% 40% 60% 80% 100% Port Fd 3/ / Table 13 - Fd factor, equal% characteristic 16

17 LTG3 DS : CV & SIZING FACTORS, linear characteristic for incompressible fluid Flow characteristic: Linear Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 1 1/ FL XFZ ,73 0,72 0,72 0,71 0,71 0,70 Sigma valve σ v (for incompressible fluid) Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ '' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 14 - CV & SIZING FACTORS, linear characteristic for incompressible fluid 17

18 LTG3 DS : CV & SIZING FACTORS, linear characteristic for compressible fluid Flow characteristic: Linear Percent of Travel 5% 10% 20% 40% 60% 80% 100% DN 1 FL XT ,82 0, Acoustic benefit factor Ab (1) Port Seat Diameter Travel Rated CV 5% 10% 20% 40% 60% 80% 100% 3/ /2 1'' /2'' '' /2'' '' /2'' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' Table 15 - CV & SIZING FACTORS, linear characteristic for compressible fluid NOTES (1) The acoustic benefit is measured in comparison with a single LN cage, having a linear characteristic Acoustic benefit = Ab-0.14*(p1/p2) Unit of measure for p1 and p2 : Pascal 18

19 LTG3 - LTG3 LN - LTG3 DS : DIMENSIONS AND MASSES 19

20 20