GESTRA Gravity Circulation Checks and DISCO Non-Return Valves GESTRA DISCOCHECK Dual-Plate Check Valves and DISCO Swing Check Valves

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1 GESTRA Gravity Circulation Checks and DISCO Non-Return Valves GESTRA DISCOCHECK Dual-Plate Check Valves and DISCO Swing Check Valves A2 Page DISCO Non-Return Valves Gravity Circulation Checks and DISCO Non-Return Valves for sanitation applications and hvac systems. Type SBO 11, Type SBO 21, Type SBO Type RK 70, Type RK Type MB DISCO Non-Return Valves for industrial applications and hvac systems. Type RK 41, Type RK 44, Type RK 44 S Type RK Type RK Type RK 86 A DISCO Non-Return Valves for special applications. Type RK 16 A, Type RK 16C Type RK DISCO Check Valves DISCOCHECK Dual-Plate Check Valves BB, DIN design 1 ) Wafer-type valves DN mm (2 48"), PN DISCO Swing Check Valves CB Wafer-type valves DN mm (2 12"), PN Swing Check Valves WB Wafer-type valves DN mm (2 12"), PN 10/ NAF-Check Valves Wafer-type valves DN mm (1 1 /2 40"), PN ) DISCOCHECK Dual-Plate Check Valves BB also available in ASME design.

2 GESTRA DISCO Non-Return (Check) Valves Tailored to Your Needs. GESTRA always one step ahead. Measuring up to market needs has been the GESTRA philosophy for decades. Backed by many years experience in the design and manufacture of non-return (check) valves, we offer our customers superior solutions for their specific requirements. Whether your are looking for economical non-return valves for hvac services, special non-return valves for chemical applications or dual-plate check valves with (adjustable) dampers we guarantee performance without compromise. These are just some examples of customer requirements which are met by our new DISCO non-return valve RK 86. We need non-return valves that conform to as many international standards for end connections as possible. The flange design should prevent squashing of the gasket during installation and guarantee leakproof sealing. Non-return valves should feature dependable bonding connections.

3 Gravity Circulation Checks SBO PN 6 Outlet: Screwed female Inlet: Union nut Application Downstream of circulating pumps in heating and hot water installations to prevent gravity circulation. Pressure/Temperature Ratings / Material Max. service Max. service Materials pressure [bar] temperature [ C] Body Valve cone ) Brass (CW614N) PPO 1) Max. service temperature at atmospheric pressure SBO 11 Outlet: Screwed male Inlet: Union nut Dimensions Type SBO 11 SBO 21 SBO 31 Size DN 1" 1 1 /4" 1" 1 1 /4" 3/4" 1" 1 1 /4" [mm] Connections Inlet 2 ) G1 1 /2 G2 G1 1 /2 G2 (BSP thread) Outlet G 1 G 1 1 /4 G1 G1 1 /4 G1 1 /4 G1 1 /2 G2 2 ) SBO 11 and SBO 21: Thread of union nut A2 SBO 21 Outlet: Screwed male Inlet: Screwed female SBO 31 Opening Pressures Differential pressures at zero volume flow. Type DN Opening pressure [mbar] Direction of flow without with spring spring SBO 11 1" 1 1 /4" SBO 21 1" 1 1 /4" /4" SBO 31 1" /4" Pressure Drop Charts SBO 11, SBO 21 SBO 31 Curve 1: SBO 21 DN 1" Curve 2: SBO 11 DN 1" Curve 3: SBO 21 DN 1 1 /4" Curve 4: SBO 11 DN 1 1 /4" Curve 1: SBO 31 DN 3 /4" Curve 2: SBO 31 DN 1" Curve 3: SBO 31 DN 1 1 /4" 29

4 Non-Return Valves RK PN 6 to PN 16 Screwed Non-Return Valves MB PN 16 Application Type PN For liquids, especially suited for heating and hot-water RK 70 6 installations. Application as gravity circulation check and check valve. RK MB For liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve. Body Material RK 70 / RK 71 DN mm Type Nominal sizes DN EN reference ASTM equivalent 1 ) RK 70 Body mm Brass (CW617N) Brass Valve disk Plastic PPE Body mm Grey cast iron (EN-J 1040) A126 Class A Plug Plastic Polyamid 6 RK 71 Body mm Brass (CW617N) Brass Valve disk AISI 316 Ti MB 14 Body mm Brass (CW614N) Brass Valve disk AISI 316 Ti 1) ASTM material similar to EN material. Observe different physical and chemical properties! RK 70 DN mm Dimensions DN [mm] [in] 1 /2 3/ /4 1 1 / / [mm] RK 70 D [mm] RK 71 D [mm] [mm] MB 14 D [mm] A.F. [mm] Pressure/Temperature Ratings Type PN Nominal size (DN) PMA / TMA / [bar] / [ C] RK mm 6 / / / mm 6 / / / 130 RK mm 16 / / / 250 MB /2" 2" 16 / / / 250 MB 14 RK Designs Type Seat Spring metal-to- EPDM FPM PTFE without special Nimonic metal spring spring spring RK 70 (Plastic) Use RK 71 X Use RK 41 Use RK 86 Use RK 41 RK 86 MB 14 X X : standard : not available Earthing connection 30

5 Non-Return Valves RK PN 6 to PN 16 Opening Pressures Differential pressures at zero volume flow. RK 71*) DN Opening pressures [mbar] Direction of flow without spring with spring Pressure Drop Charts The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. V W = V 1000 V W = Equivalent water volume flow in [l/s] or [m 3 /h] = Density of fluid (operating condition) in [kg/m 3 ] V = Volume of fluid (operating condition) in [l/s] or [m 3 /h] When selecting valve please consider: Partial opening = Full opening = instable range stable range A2 RK 70*) DN Opening pressures [mbar] Direction of flow without with spring spring *) RK 70, 71 are not available with special spring or without spring Volume flow V W Pressure drop p 31

6 Non-Return Valves RK PN 6 to PN 16 Application Type PN RK For liquids, gases, vapours. Application as gravity circulation RK check, vacuum breaker, breather, foot valve, pressure-main- RK 44S 16 taining valve, check valve. RK RK 41 especially suited for heating installations, RK 44 and RK 44S for sea water and drinking water, RK 76 for industrial applications Body Material RK 41 / RK 44 / RK 44S DN mm Type Nominal sizes (DN) DIN reference ASTM equivalent 1 ) RK 41 Body mm Special brass (CW710R) Special Brass Valve disk AISI 316 Ti Body mm Grey cast iron (EN-J 1040) A126 Class A Plug A182 F6 RK 44 Body mm Bronze (CC480 K-GS) B584 C90500 Valve disk AISI 316 Ti Body mm Grey cast iron (EN-J 1040) A182 Class A Plug Bronze (CC480 K-GS) B584 C90500 RK 44S Body mm Bronze (CC480 K-GS) B584 C90500 Valve disk Bronze (CW352H) Body mm Bronze (CC483 K-GC) B505 C90700 Plug Bronze (CC480 K-GS) B584 C90500 RK 76 Body mm A217-CA15 Valve disk AISI 316 Ti 1 ) ASTM material similar to EN material. Observe different physical and chemical properties! Dimensions DN [mm] [inch] 1 /2 3/ /4 1 1 / / [mm] RK 41 D [mm] RK 44 D [mm] RK 44S D [mm] RK 76 D [mm] RK 41 / RK 44 / RK 44S DN mm Pressure/Temperature Ratings with metal-to-metal seat Type PN Nominal sizes DN PMA / TMA / [bar] / [ C] RK mm 16 / / / mm 16 / / / 300 RK mm 16 / / / mm 16 / / / 250 RK 44S mm 16 / / / 90 RK 76 C 300 / mm 49.6 / / / 300 Designs 32 RK 76 DN mm Type Seat Springs metal- EPDM FPM PTFE without special Nimonicto-metal ( 40 up to ( 25 up to ( 190 up to spring spring spring 150 C) 1 ) 200 C) 1 ) 250 C) 1 ) RK 41 X O O O O Earthing connection RK 44 X O O O O Use RK 44S X O O O RK 86 RK 76 X O O O O O O 1 ) Observe pressure/temp. ratings of the equipment X : standard O : optional : not available

7 Non-Return Valves RK PN 6 to PN 40 Short overall length according to DIN EN 558-1, table 11, series 49 (=^ DIN 3202, part 3, series K4) Pressure Drop Charts The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. V W = V V W = Equivalent water volume flow in [l/s] or [m 3 /h] V 1000 = Density of fluid (operating condition) in [kg/m 3 ] = Volume of fluid (operating condition) in [l/s] or [m 3 /h] Opening Pressures Differential pressures at zero volume flow. RK 41, RK 44, RK 44S, RK 76 DN Opening pressures [mbar] Direction of flow without spring with spring A2 RK 41, RK 44, RK 44S RK 76 When selecting valve please consider: Partial opening = Full opening = instable range stable range When selecting valve please consider: Partial opening = Full opening = instable range stable range (DN ) Volume flow V W Pressure drop p 33

8 Non-Return Valves RK PN 6 to PN 40 Short overall length according to DIN EN 558-1, table 11, series 49 (=^ DIN 3202, part 3, series K4) min. max. RK 86 and RK 86 A Our Robust All-Rounder Application Type PN RK 86 40/class 300 RK 86 A 40/class 300 For liquids, gases, vapours. Application as gravity circulations check, vacuum breaker, breather, foot valve, pressure-maintaining valve, check valve. RK 86 A especially suited for low temperatures, aggressive fluids, boiler feedwater lines, and other industrial applications. Body Material RK 86 / RK 86 A DN mm D min. D max. RK 86 / RK 86 A DN mm Type Nominal sizes DN EN reference ASTM equivalent 1 ) RK 86 Body mm Chromium steel, A 743-CA6-NM Dimensions Valve disk AISI 316 Ti Body mm GP240GH (1.0619) A 216 WCB Plug A182 F6 RK 86A Body mm A 351 CF 8M Valve disk/plug AISI 316 Ti 1 ) ASTM material similar to EN material. Observe different physical and chemical properties! Nominal sizes [mm] [Inch] 1 /2 3/ /4 1 1 / / Overall dimensions D min [mm] D max Class 125/ PN 10/ D PN PN Class Weight [kg] Pressure/Temperature Ratings with metal-to-metal seat Type PN Nominal sizesdn PMA / TMA / [bar] / [ C] 40/class / / / 350 RK 86 40/class / / / 400 RK 86 A 40/class / / / RK 86 / RK 86 A DN mm Designs Type Seat Springs metal- EPDM FPM PTFE without special Nimonicto metal ( 40 up to ( 25 up to ( 190 up to spring spring spring 2 ) 150 C) 1 ) 200 C) 1 ) 250 C) 1 ) Earthing connection 3 ) RK 86 X O O O O O O X/O RK 86A X O O O O O O X/O 1) Observe pressure/temp. ratings of the equipment 2) Required for temperatures above 300 C 3) Earthing connection for DN as standard. DN on request at extra cost. X : standard O : optional

9 Non-Return Valves RK PN 6 to PN 40 Pressure Drop Charts The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. V W = V 1000 V W = Equivalent water volume flow in [l/s] or [m 3 /h] = Density of fluid (operating condition) in [kg/m 3 ] V = Volume of fluid (operating condition) in [l/s] or [m 3 /h] Opening Pressures Differential pressures at zero volume flow. RK 86, 86 A DN Opening pressures [mbar] [mm] Direction of flow without with spring spring A2 RK 86, 86A When selecting valve please consider: Partial opening = Full opening = instable range stable range (DN ) Volume flow V W Pressure drop p 35

10 Non-Return Valves RK PN 40 to PN 160 Short overall length according to DIN EN 558-2, table 11, series 52 (=^ DIN 3202, part 3, series K5) Application Type PN RK 16 A 40/class 300 RK 16 C 40/class 300 RK For liquids, gases, vapours. Application as check valve, breather, foot valve, pressure-relief valve or pressuremaintaining valve. RK 16 A and RK 16 C for aggressive fluids and low temperatures RK 49 for high pressures and temperatures Body Material RK 16 A, RK 16 C Type Nominal sizes DN EN reference ASTM equivalent 1 ) RK 16A Body mm AISI 316 Ti Valve disk AISI 316 Ti RK 16C Body mm Hastelloy C Valve disk Hastelloy C RK 49 Body mm A351 CF8 Valve disk Body mm A217 WC6 Plug ) ASTM material similar to EN material. Observe different physical and chemical properties! RK 49, DN mm Dimensions DN [mm] [in] 1/2 3/ /4 1 1 / / [mm] RK 16 A D [mm] ) ) RK 16 C D [mm] ) ) RK 49 D [mm] ) PN 10/16 2 ) PN 25/40 Pressure/Temperature Ratings with metal-to-metal seat Type PN Nominal sizes DN PMA / TMA / [bar] / [ C] RK 16 A 40/Class / / / 550 RK 16 C 40/Class / / / 400 RK / / / / / / 530 Designs RK 49, DN mm Type Seat Spring metal- EPDM FPM PTFE without special Nimonicto-metal ( 40 up to ( 25 up to ( 190 up to spring spring spring 2 ) 150 C) 1 ) 200 C) 1 ) 250 C) 1 ) RK 16A X O O O O O O O RK 16C X O O RK 49 X O X O 1) Observe pressure/temp. ratings of the equipment 2) Required for temperatures above 300 C. 3) Earthing connection for DN as standard. DN on request at extra cost. X : standard O : optional : not available Earthing connection 3 ) 36

11 Non-Return Valves RK PN 40 to PN 160 Short overall length according to DIN EN 558-2, table 11, series 52 (=^ DIN 3202, part 3, series K5) Pressure Drop Charts Opening Pressures The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. V W = V 1000 V W = Equivalent water volume flow in [l/s] or [m 3 /h] = Density of fluid (operating condition) in [kg/m 3 ] V = Volume of fluid (operating condition) in [l/s] or [m 3 /h] Differential pressures at zero volume flow. RK 49 DN Opening pressures [mbar] Direction of flow without with spring spring Opening Pressures Differential pressures at zero volume flow. RK 16 A DN Opening pressures [mbar] Direction of flow without with spring spring Opening Pressures Differential pressures at zero volume flow. RK 16 C DN Opening pressures [mbar] Direction of flow without with spring spring A RK 16 A, RK 16 C (dash lines apply to RK 16 A) When selecting valve please consider: Partial opening = Full opening = instable range stable range (RK 16C) RK 49 When selecting valve please consider: Partial opening = Full opening = instable range stable range Volume flow V W Volume flow V W Pressure drop p Pressure drop p 37

12 DISCOCHECK Dual-Plate Check Valves BB DIN design DN 50 1 ) 1200 mm, PN ) Short overall length according to DIN EN 558-1, table 11, series 16 (=^ DIN 3202, part 3, series K3) Application A For liquids, gases, vapours. In heating, air-conditioning, water-supply and cooling installations, steam and condensate systems, oil pipelines and natural gas lines. For use with sea water, in sewage works, downstream of fans and compressors. For drinking water with evasint 3 ) lining, and for sea water with rubber lining. With adjustable dampers for installations with waterhammer problems. Metal-to-metal or soft seat (EPDM, FPM) ) DN 50, 65 and 80 only available as BB... A (stainless steel). 2) If PN > 40 and DN > 500 mm please ask for corresponding data sheets. 3) EVASINT is a product of BAYER AG, everkusen. Materials DN mm Design Part designation Nominal size EN ASTM 4 ) DN reference equivalent Grey cast iron Body EN-J 1040 A 126 Class A (BB... G) Dual plate EN-JS 1030 A Carbon steel Body A 105 (BB... C) Body ab A 216 WCB Dual plate A 182 F6 A Dual plate ab A 216 WCB Stainless steel Body A 182 F 316 (BB... A) Body ab A 351 CF 8 M Dual plate A 182 F 316 Dual plate ab A 351 CF 8 M 80 4 ) Physical and chemical properties comply with EN grade. Pressure/Temperature Ratings with metal-to-metal seat DN mm Max. service pressure [bar] Design Type PN at temperature [ C] 5 ) Grey cast iron down to 10 C at nominal pressure BB 11 G / 21 G G / 22 G G / 24 G Carbon steel down to 10 C at nominal pressure BB 12 C / 22 C C / 24 C C / 25 C C / 26 C C C C Stainless steel down to 105 C at nominal pressure BB 12 A / 22 A A / 24 A A / 25 A A / 26 A A A A ) For temperatures above +300 C special springs of Inconel X 750 are required. BB 12A-18A DN applicable up to max. 500 C. 38

13 DISCOCHECK Dual-Plate Check Valves BB DIN design DN mm, PN ) BB Designs Type Seat ining metal- EPDM FPM NBR PTFE 2 ) EVASINT 4 ) Rubber 5 ) to-metal ( 40 up to ( 25 up to ( 30 up to ( 25 up to 150 C) 1 ) 200 C) 1 ) 110 C) 1 ) 200 C) 1 ) BB...G O X O O O O BB...C X O O O O 3 ) O 6 ) O 6 ) BB...G X O O O O 3 ) 1 ) Observe pressure / temp. ratings of equipment 2 ) Cover FPM ring with PTFE 3 ) From DN 150. Not possible for smaller sizes. X : standard O : optional : not available 4 ) Inside and outside of body lined with EVASINT, seat made of EPDM. Internals either of bronze or of stainless steel. Temp. range 10 C up to 70 C. EVASINT is a product of Bayer AG, everkusen. 5 ) Inside of body lined with rubber, seat made of EPDM. Internals either of bronze or of stainless steel. Temp. range 10 C up to 90 C. 6 ) From DN 150. For smaller sizes use DN BB...A Type Damper 7 ) Earthing Drain without Springs connection plug spring Inconel spring 8 ) 2 WA 10 ) 7 WA 11 ) 5 VO 12 ) BB...G O O O O X O BB...C O O O 9 ) O O O X O BB...A O O 9 ) O O O X O 7 ) From DN 200 up to DN 800. Max. temperature rating 110 C, see page 41. X : standard O : optional : not available 8 ) Inconel X 750 (Required for temperatures above 300 C). Opening pressure 7 mbar (spring 7 WAI). 9 ) From DN ) Spring for 2 mbar opening pressure with horizontal installation. 11 ) Spring for 7 mbar opening pressure (standard) with horizontal installation. 12 ) Spring for 5 mbar opening pressure with vertical installation and downward flow. Opening Pressures Differential pressures at zero volume flow. DN Opening pressures [mbar] with upward flow without with spring spring 7 WA 7 WAI 2 WA 5 VO (15) 18 (22) 13 (17) 27 (35) (18) 19 (25) 14 (20) 29 (41) (18) 21 (25) 16 (20) 33 (41) (25) 22 (32) 17 (27) 35 (55) (25) 24 (32) 19 (27) 39 (55) (25) 26 (32) 21 (27) 43 (55) (28) 30 (35) 25 (30) 51 (61) Values indicated in brackets apply for BB 17/18/19. A2 Pressure Drop Chart The chart is valid for water at 20 C; for other fluids, the equivalent water volume flowrate must be calculated and used in the chart. The values indicated in the chart are applicable to valves with 7 mbar springs with horizontal flow. With vertical flow deviations occur only within the range of partial opening. The dashed lines in the chart are valid for valves with 2 mbar springs with horizontal flow. The chart and the flow characteristics apply to values up to PN 40. For valves with higher pressure ratings (PN) the loss coefficients (zeta values) and the pressure drops are increased by approx. 20 %. The k vs values are correspondingly reduced. V W = V 1000 V W = Equivalent water volume flow in [l/s] or [m 3 /h] = Density of fluid (operating condition) in [kg/m 3 ] V = Volume flow of fluid (operating condition) in [l/s] or [m 3 /h] 1 ) If PN > 40 and DN > 500 mm ask for corresponding data sheets. 39

14 DISCOCHECK Dual-Plate Check Valves BB DIN design DN mm, PN ) Dimensions and Weights DN PN Dimensions [mm] Weight D A [kg] 2 ) ) ) ) ) If PN > 40 and DN > 500 mm ask for corresponding data sheets. 2 ) Weights rated for cast steel grade GP 240 GH (GS-C 25). 3) DN 50, 65 and 80 only available as BB... A (stainless steel). DN PN Dimensions [mm] Weight D A [kg] 2 ) , ,80, Type Code BB 2 4 C 150 FPM 7 WA Valve Type Series 1 DN mm and from DN 450 mm as well as from PN 63 2 DN mm up to PN 40 Pressure rating 1 PN 6 (only grey cast iron) 2 PN 10 4 PN 16 5 PN 25 6 PN 40 Body material G Grey cast iron C Steel A Austenitic steel Nominal size DN Seat HD metal-to-metal EPDM FPM PTFE Springs/Opening pressures 7 WA Spring for 7 mbar with horizontal installation 7 WAI Inconel spring for 7 mbar with horizontal installation 2 WA Spring for 2 mbar with horizontal installation 5 VO Spring for 5 mbar with downward flow Typical example: BB 24 C 150 FPM 7 WA Explanatory note: Dual-plate check valve BB 24, PN 16, made of cast steel type GS-C 25, DN 150 mm with FPM gasket and spring (7 mbar) for horizontal installation. 40

15 DISCOCHECK Dual-Plate Check Valves BB DIN design DN mm, PN ) BB with lining from DN 150 BB with ining Application Design with EVASINT lining 2 ): for drinking water. Design with rubber lining: for sea water. Design with dampers: to solve waterhammer problems. Metal-to-metal or elastic seat (EPDM, FPM) 1 ) For pressure ratings > PN 40 and sizes > DN 500 please ask for corresponding data sheets. 2 ) EVASINT is a product of BAYER AG, everkusen. Temperature imits Hard-rubber evasint lining lining Dual plates, hinge pins and springs are not lined. Dual plates standard with O-rings of EPDM or on request with metal seating surface. EVASINT lining 10 C up to 70 C Rubber lining 10 C up to 90 C A2 BB with Dampers Application To solve waterhammer problems in pipelines carrying liquids.to evaluate possible waterhammer problems please ask for our questionnaire. Pressure/Temperature Ratings Size DN [mm] [inch] Max. service pressure [bar] Max. service temperature [ C] 110 Max. admissible pressure at line leading to the valve (pump switched off) [bar] 0.5 BB with patented adjustable dampers, DN Bei Druckstoßproblemen BB mit patentierter Schließdämpfung in DN 200 bis

16 DISCO Swing Check Valves CB DN mm, PN 6 40 Application Type PN For liquids, gases, vapours CB CB 14 for water and compressed air CB 24 S 16 CB 24 S for sea water, drinking water, swimming-pool water CB For low temperatures CB 26 A 40 CB 26 A for aggressive fluids, drinking water, or swimming-pool water Material D 70 d Type Part designation CB 14 Body mm Nominal sizes EN ASTM 1 ) DN reference equivalent A 284 B galvanized galvanized Flap mm NBR NBR a CB 14, DN mm CB 24 S Body mm Bronze (CC 483K-GS) B 505 C mm Bronze (CC 332G) B 148 Alloy 952 Flap mm Bronze (CC 332G) B 148 Alloy 952 CB 26 Body mm A mm A 284 B mm A 351 CF 8 MC Flap GGG-40.3 (EN-JS 1025) CB 26 A Body mm AISI 316 TI mm A 351 CF 8 MC Flap mm A 351 CF 8 MC 1 ) Physical and chemical properties comply with EN grade. D Pressure/Temperature Ratings Type Nominal sizes DN PN PMA / TMA / [bar] / [ C] CB / / 60 4 / 80 CB 24 S / / 90 2 )13 / ) CB 14, DN mm CB / / / / / / 300 CB 26 A / / / ) Max. pressure/temperature rating for CB 24 S without springs. CB Designs D 60 CB 24 S, CB 26, CB 26 A DN mm a d Type Seat Springs metal- NBR EPDM FPM PTFE 4 ) without special to-metal ( 30 up to ( 40 up to ( 25 up to ( 25 up to spring spring 110 C) 3 ) 150 C) 3 ) 200 C) 3 ) 200 C) 3 ) CB 14 X 5 ) X CB 24S O X O O O CB 26 O X O O O CB 26A O X O O O 3) Observe pressure / temp. ratings of the equipment 4) Cover FPM ring with PTFE 5 ) Flap made from NBR (Perbunan) Temp. range: 10 C up to 80 C Weights and Dimensions X : standard O : optional : not available Nominal size Dimensions [mm] Weight [kg] DN CB 14 CB 24 S, CB 26, CB 26 A CB14 CB24S CB26 [mm] [in] D a d 6 ) D a d 6 ) CB26A / ) Minimum flange bore and inside pipe diameter. 42

17 DISCO Swing Check Valves CB DN mm, PN 6 40 Pressure Drop Charts The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial openings. CB 14 V W = V V W = Equivalent water volume flow in [l/s] or [m 3 /h] V 1000 = Density of fluid (operating condition) in [kg/m 3 ] = Volume flow of fluid (operating condition) in [l/s] or [m 3 /h] A2 Opening Pressures Differential pressures at zero volume flow. Type DN Opening pressures [mm] [mbar] Direction of flow CB ) Type DN Opening pressures [mm] [mbar] Direction of flow without with spring spring CB 24 S CB 26/ ) CB 26 A ) Valves should not be used for downward flow applications, since the spring will not close the valve flap. CB 24 S, CB 26, CB 26 A 43

18 Swing Check Valves WB without spring, DN mm, PN 10/16 Application a WB 26 for liquids, gases and vapours WB 26 A for aggressive fluids WB 24 S for sea water Installation in horizontal or vertical lines with upward flow. Materials Ø do Type ASTM reference EN 1 ) equivalent WB 26 Body and flap AISI galvanized galvanized WB 26 A Body AISI Flap A 351 CF 8M WB 24 S Body and flap Aluminium bronze Aluminium bronze O-rings NBR as standard 1 ) Physical and chemical properties comply with ASTM grade. WB 26, WB 26A, WB 24 S DN mm Pressure/Temperature Ratings Nominal pressure PN 16 Design with O-rings 2 ) Max. service pressure [bar] 16 NBR Related temperature [ C] 110 Min. temperature 3 ) [ C] 10 2) O-rings in flap and valve faces made of NBR as standard. 3 ) Minimum temperature for nominal pressure rating. WB Design Type Seat Spring metal-to- NBR EPDM FPM PTFE without special metal ( 30 up to ( 40 up to ( 25 up to ( 25 up to spring spring 110 C) 4 ) 150 C) 4 ) 200 C) 4 ) 200 C) 4 ) WB 24S O X Use CB 26 O X WB 26 O X Use CB 26 O Use CB 26 X WB 26A O X Use CB 26A O Use CB 26A X 4 ) Observe pressure/temp. ratings X : standard O : optional : not available 44 Weights and Dimensions Nominal size DN Dimensions [mm] Weight 5 ) [mm] [in] D a d o [kg] / ) The weight ratings apply for WB 26 and WB 26 A. WB 24 S reduced by approx. 5 %.

19 Swing Check Valves WB without spring, DN mm, PN 10/16 Pressure Drop Chart The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial openings. V W = V V W = Equivalent water volume flow in [l/s] or [m 3 /h] V 1000 = Density of fluid (operating condition) in [kg/m 3 ] = Volume flow of fluid (operating condition) in [l/s] or [m 3 /h] A2 Opening Pressures Opening pressure zero when valve is installed in horizontal line. 45

20 NAF-Check Valves DN mm, PN Application for liquids, gases, vapours, aggressive fluids and low temperatures. NAF-Check DN mm Materials A Design Part Nominal size EN ASME / SS designation DN [mm] equivalent SS Body ASTMA351CF8M Steel ASTM A 216 WCC Disc SS SS SS Stainless Body steel ASTMA351CF8M Disc SS High-tempe- Body ASTMA217WC rature steel Disc ASTMA217WC D Weight and Dimensions Type PN DN Dimensions [mm] Weight [mm] D A [kg] / / / / / ) ) DN 400 mm only for PN 40/63. Pressure/Temperature Ratings Design Type PN DN [mm] Max. service pressure [bar] / related temperatures [ C] 3 ) Steel down to / C at nominal pressure / Stainless steel down to / C at nominal pressure / High-temperature steel down to 10 C at / nominal pressure 3) Max. service temperature for valve with spring C. 46

21 NAF-Check Valves DN mm, PN Pressure Drop Chart The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial openings. The chart and flow characteristics are available up to and including PN 40. Higher PN increase the zeta values and pressure drops at the same flowrates by approx. 20 %. The k vs values decrease accordingly. V W = V V W = Equivalent water volume flow in [l/s] or [m 3 /h] V 1000 = Density of fluid (operating condition) in [kg/m 3 ] = Volume flow of fluid (operating condition) in [l/s] or [m 3 /h] A2 47

22 GESTRA-DISCOCHECK Dual-Plate Check Valves and DISCO Swing Check Valves The Power of Quality GESTRA's extensive customer adaptation and uncompromising quality standards guarantee outstanding product reliability coupled with economic efficiency and increased plant safety. No early wear on hinge pins or springs Dual-plate check valves BB feature two hinge pins and four closing springs for lower opening pressures. eakproof body The body of the dual-plate check valve has no external through-hole, hence no need for unnecessary plate replacements due to a leaky valve body. Suitable for use in aggressive fluids The dual-plate check valves BB are available with evasint or hardrubber lining for application in seawater and corrosive fluids. Seat not subject to wear or damage During the opening process the hinge side of the plates opens first, thereby eliminating wear of the seating surfaces (soft or metal-to-metal seat) and extending the service life of the dual-plate check valves BB. 48 A positive safeguard against waterhammer Dual-plate check valves BB are available with patented adjustable dampers to protect the installation against damage caused by waterhammer.