Series 240 Pneumatic Control Valves Type DWA, -7 DWA, -9 DWA Globe Valve Type 241 DWA

Transcription

1 Series 240 Pneumatic Control Valves Type DWA, -7 DWA, -9 DWA Globe Valve Type 241 DWA ANSI version Application Control valve for PSA systems (Pressure Swing Adsorption) (German: DWA) Nominal sizes Nominal pressure ANSI Class Temperatures o F ( o C) Standards ANSI, ASME and ASTM Type 241 Globe Valve with operated optionally with Type 3271 Pneumatic Actuar (Type Control Valve) Type 3277 Pneumatic Actuar (Type Control Valve) for integral positioner attachment Type 3275 Pneumatic Pisn Actuar (Type Control Valve) Valve body optionally manufactured of Stainless carbon steel in acc. with ASTM specification Forged steel or stainless forged steel Stainless carbon steel Undivided valve bonnet up nominal size DN 6 Valve plug optionally Soft sealing Lapped-in metal. These control valves, designed according the modular-assembly principle, can be equipped with various accessories: Positioners, solenoid valves and other accessories according (DIN) IEC and NAMUR recommendation. See Information Sheet T 8350 EN for details. Fig. 1 Type DN Versions Standard version For temperatures from 20 F 430 F ( 29 C +220 C) Type DWA (Fig. 1) Nominal sizes DN with Type 3271 Actuar (see Data Sheet T 8310 EN) Type DWA (Figs. 2 and 4) Nominal sizes DN 1 2 3, forged steel version up nominal size DN 3, with Type 3277 Actuar for integral positioner attachment (see T 8311 EN) Type DWA (Fig. 3) 1 2 8, with Type 3275 Pisn Actuar (see T 8314 EN), for integral positioner attachment and/or limit switch Fig. 2 Type DN Additional versions optionally with Flow divider for noise reduction in both directions of flow See Data Sheet T 8081 EN Fig. 3 Type DN Fig. 4 Type DN Forged steel version Associated Information Sheet T 8000 EN Associated Data Sheets for pneu. actuars T 8310 EN, T 8311 EN, T 8314 EN Edition July 2000 Data Sheet T EN

2 Fail-safe action Depending on the arrangement of the compression springs in the Type 3271 or Type 3277 Actuar (see Data Sheet T 8310 EN and T 8311 EN for details), the control valve offers two different fail-safe actions effective upon air supply failure. "Actuar stem extends", the valve is closed upon air supply failure; "Actuar stem retracts", the valve is opened upon air supply failure. The double acting Type 3275 Pisn Actuar (Fig. 6) does not have a fail-safe action. Notes on the differential pressure tables 4a 5d The differential pressure tables listed below have been prepared under the following conditions: For valves in nominal sizes 1 2 2" with actuars containing an effective diaphragm area of 700 cm 2 (108.5 in 2 ), the maximum permissible supply pressure comprises 58 psi (4 bar) Process medium flow directed against the closing direction of the valve plug Version with PTFE stuffing box With the maximum differential pressures specified, the leakage rates specified in Table 1 are not exceeded. The differential pressure specified can be limited by the Pressure-Temperature Diagram. Fig. 6 Type DWA, with Type 3275 Pneumatic Pisn Actuar Fig. 5 Type 241 Valve, Fig. 7 Type 241 DWA, 1 2 3, forged steel version 2 T EN

3 Table 1 Technical data for Type 241 DWA Control Valve Nominal size in , 1,, 2, , 1,, 2, 3 ASTM material A 216 WCB A 105 A 351 CF8M A 182 F316 Type of connection Flange Flange Type of flange RF 1) RF 1) Nominal pressure ANSI Class 150/ / Seat/plug sealing Soft or lapped-in metal Characteristic Equal percentage or linear Rangeability 50 : 1 for sizes : 1 for sizes Temperature ranges C ( F) Permissible operating pressures acc. pressure-temperature diagram (see Information Sheet T EN) Valve C ( F) Leakage class acc. (DIN) IEC 534 Valve plug Soft sealing VI Lapped-in metal IV-S2 4 (DN 100) and larger: IV-S1 1) Other versions on request Table 2 Materials Standard version Valve body 1) Carbon steel A 216 WCB Forged steel A 105 Stainless carbon steel A 351 CF8M Valve bonnet A 105 A 182 F 316 Stainless forged steel A 182 F316 Seat and plug WN WN Sealing ring for soft sealing: PTFE with glass fiber Guide bushings WN WN Stuffing box packing V-ring packing PTFE with carbon Spring: WN Stem protective ring Body gasket Metal 1) See pressure-temperature diagram, other materials available on request 3 T EN

4 Table 3 Cv and Kvs values Table 3a Summary with St I Flow Divider (Cv I, Kvs I) Cv K vs Cv I K vs I Seat in Ø D mm Travel in mm Table 3b Versions without flow divider Cv K vs Nominal size in/mm Table 3c Versions with St I Flow Divider (CvI/KvsI) CvI K vsi Nominal size in/mm Terms for control valve sizing according (DIN) IEC 534, Part 2-1 and 2-2: F L = 0.95, x T = 0.75 Conversion of valve sizing coefficients: C v (US gallons/min.) = K vs (m 3 /h) 4 T EN

5 Table 4 Differential pressure tables Values in shaded columns correspond the standard operation, i.e. operation at rated travel Differential pressures in the non-shaded columns apply maximum pretensioned springs Values in parentheses refer mid-travel position Observe the notes on the differential pressure tables. Table 4a Permissible differential pressures p Pressures in bar For control valve with the fail-safe action "actuar stem extends" Valve closed at a supply pressure of 0 bar Bench range (bar) for actuar with 240 cm cm ) ( ) ( ) 350 cm cm ( ) ( ) Required supply pressure (bar) DN in C v Actuar cm 2 p applies when p 2 = and (50) (50) (50) (50) (50) (50) (50) and (23) (35) (36) (50) (21) (22) (33) 1) Not for actuar with 120 cm 2 (18.6 ) effective diaphragm area 5 T EN

6 Table 4b Permissible differential pressures p Pressures in psi For control valve with the fail-safe position "actuar stem extends" Valve closed at a supply pressure of 0 psi 240 cm Bench range (psi) 120 cm ) ( ) ( ) for actuar with 350 cm cm 2 ( ) ( ) Required supply pressure (psi) DN in and 2 3 C v Actuar cm 2 p applies when p 2 = (725) (725) (725) (725) (725) (725) (725) and (333) (507) (520) (725) (305) (320) (475) 1) Not for actuar with 120 cm 2 (18.6 ) effective diaphragm area 6 T EN

7 Tables 4c and 4d Permissible differential pressures p For control valve with the fail-safe action "actuar stem retracts" Valve closed at required supply pressure Bench range (bar/psi) for actuar with (cm 2 ) Table 4c Pressures in bar Table 4d Pressures in psi Req. supply pressure (bar/psi) DN in and C v Actuar cm 2 p applies when p 2 = 0 p applies when p 2 = and T EN

8 Table 5a Permissible differential pressures p for Type 241 DWA Valve with plug with soft sealing and Type 3275 Pisn Actuar Pressures in bar Nominal size Flow rate Actuar Supply pressure in C v cm T EN

9 Table 5b Permissible differential pressures p for Type 241 DWA Valve with plug with soft sealing and Type 3275 Pisn Actuar Pressures in psi Nominal size Flow rate Actuar Supply pressure in C v cm T EN

10 Table 6a Permissible differential pressures p for Type 241 DWA Valve with lapped-in metal plug and Type 3275 Pisn Actuar Pressures in bar Nominal size Flow rate Actuar Supply pressure in Cv cm T EN

11 Table 6b Permissible differential pressures p for Type 241 DWA Valve with lapped-in metal plug and Type 3275 Pisn Actuar Pressures in psi Nominal size Flow rate Actuar Supply pressure in C v cm T EN

12 Table 7 Dimensions for standard version of Type DWA, Type DWA and Type DWA Valve Length L H1 in mm Cl 125 RF in and 150 RF mm Cl 300 RF 700 cm 2 / Type 3275 in mm in mm H2 (approx.) in mm H2 in Forged steel version (approx.) mm Actuar Type 3271/3277 Type 3275 Effective diaphragm area Diaphragm D cm in in mm H in mm H3 1) in mm Thread M 30 x 1.5 M 30 x 1.5 a (for Type 3271/3275 Actuar) G 1 8 (NPT 1 8) G 3 8 (NPT 3 8) G 3 8 G 1 2 a2 (for Type 3277 Actuar) G 3 8 (NPT 3 8) 1) Minimum clearance for actuar disassembly H3 ØD a H3 D H3 ØD a H H H a2 H1 H1 H1 H2 H2 H2 L L L Type DWA Type DWA Type DWA T EN

13 Table 8 Weights for Type DWA, Type DWA and Type DWA Control Valve Valve DN in mm Weight without actuar lbs kg Actuar Type 3271 Type 3277 Type 3275 Effective area Weight, approx. cm in lbs kg Following details are required on ordering: Nominal size... Nominal pressure ANSI Class... Body material Acc. Table 2 Type of connection Flanges (type: FF or RF) or NPT thread Valve plug Soft sealing or lapped-in metal Characteristic Equal percentage or linear Actuar Type 3271, Type 3277 or Type 3275 acc. T 8310 EN, T 8311 EN or T 8312 EN Fail-safe position Valve CLOSED or valve OPEN Process medium Density in lb/cu.ft or kg/m 3 and temperature in F or C Flow rate in lbs/h or kg/h or cu.ft/min or m 3 /h in standard or operating conditions Pressure p 1 in bar (absolute pressure p abs) p 2 in bar (p abs) at minimum, standard and maximum flow rate Accessories Positioner and/or limit switch Specifications subject change without notice. 13 T EN

14 SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 3 D Frankfurt am Main Telefon (0 69) Telefax (0 69) Internet: T EN