Series 240 Pneumatic Control Valves with Fail-safe Action Type and Type 241-7

Transcription

1 Series 240 Pneumatic Control Valves with Fail-safe Action Type and Type Typetested Application Control valves for water and steam; with safety function against excess temperature or pressure in heating systems. Nominal sizes DN 15 DN 1 Nominal pressures PN 16 PN 40 For water and steam up 3 C (662 F) Conversion of valve sizing coefficients: C v (in U.S.-gallons/min) = 1.17 K vs (in m 3 /h) K vs (in m 3 /h) = 0.86 C v (in U.S.-gallons/min) The typetested Type or Type Pneumatic Control Valve with Fail-safe Action essentially consists of a Type 241 Globe Valve and either a Type 271 or Type 3277 Pneumatic Actuar (latter for integral positioner attachment) and an attached solenoid valve (see Data Sheet T 8310 E and T 8311 E for actuar details). The control valves are used for temperature control when connected a pneumatic or electric controller. Within the safety circuits, the valve also assumes the function of a shut-off device, which is triggered by the signal of a temperature or pressure limitation device and upon air supply failure. This control valve has been typetested by the German Technical Inspecrate TÜV (Technischer Überwachungsverein) in accordance with DIN , which defines it as a shut-off and control device. The standard version is suitable for water and steam up 220 C. Another version, with extension bonnet up 3 C, is suitable for the operating pressures listed in section "Technical data" (Table 1) and for a maximum permissible ambient temperature of C. In safety circuits, a strainer (e.g., Type 2 NI according Data Sheet T 1015 E) is be installed in the direction of flow upstream of the control valve. Valve body manufactured of cast iron, spheroidal graphite iron, cast steel, stainless steel, as well as forged steel C22.8 and stainless steel WN Undivided valve bonnet Low-noise, standard plug with metal sealing. Special version equipped with flow divider (silencer) for further noise level reduction. Attachment of positioners and limit switches according DIN IEC 534 and NAMUR recommendation (see Information Sheet T 83 E for details) Versions (typetested) Standard version for temperatures up 220 C Type (Fig. 1) With Type 241 Globe Valve, Type 271 Pneumatic Actuar and Type 3701 (see Data Sheet T 8375 E for details), Type E 3963 or Type 449 Solenoid Valve Type With Type 241 Globe Valve, Type 3277 Pneumatic Actuar and Type 3701 (see Data Sheet T 8375 E for details), Type E 3963 or Type 449 Solenoid Valve Special version With extension bonnet for temperatures up 3 C Fig. 1 Type Pneumatic Control Valve (typetested) with Type 3701 Solenoid Valve Also available are: Electric control valve with fail-safe action See Data Sheet T 5871 E DIN/DVGW - certified versions for all-gas See Data Sheet T 8020 E Typetested versions for liquid fuels and Liquefied Petroleum Fuel (LPF) in the liquid phase See Data Sheet T 8022 E Associated Information Sheet Associated Data Sheet for pneumatic actuar T 8010 E Edition March 1997 T 8310 E, T 8311 E Data Sheet

2 Principle of operation (Figs. 2 and 3) In control mode, the actuar is pressurized with the signal pressure pst from either the temperature controller or the positioner, resp. If the power fails or the safety limiting device interrupts the control current when the set temperature or pressure limits are exceeded, the solenoid valve switches back the neutral position. As a result, the following occurs: The supply pressure connection is cut off, the actuar is vented, and the opposing force of the actuar springs "closes" the valve. Pst Fig. 2 Connection diagram for pneumatic positioner with safety function Fig. 3 Type Control Valve (typetested) Register numbers The Type 241 Globe Valves have been typetested by the German Technical Inspecrate TÜV in combination with the Type 271 and Type 3277 Pneumatic Actuars. Register numbers available on request. Table 1 Technical data (nominal sizes DN 15 DN 1) See Data Sheet T 8015 E and T 8017 E for additional "Technical data" Type 241 Globe Valve Without extension bonnet With extension bonnet Medium temperature 120 C 1 C 200 C 220 C 2 C 300 C 3 C Material of construction Permissible operating pressures in bar Cast iron GG-25 1) PN Spheroidal graphite iron PN GGG-40.3 PN Cast steel GS-C 25 or PN forged steel C 22.8 PN SS WN or WN PN Flanges All DIN versions Characteristic Equal percentage/linear/on-off Plug sealing Metal Leakage rate According DIN IEC 534, Class IV Seconds close <5 s with limiting function 1) With hot water, only up DN ; for plants acc. the German technical rules for steam boilers (TRD); max. permissible operating pressure 10 bar; for plants acc. the German technical rules for pressure vessels (TRB) up PN 16 permissible. Solenoid valve Type 3701 Type 3963 Type 449 Type of protection EEx ia IIC T6 - EEx ia IIC T6 Ex s G4 Electrical connection and power consumption 24 V/ Hz 230 V/ Hz 1 mw each 7.5 V DC - 20 mw 24 V DC - 1 mw 24 V/ Hz 230 V/ Hz 1 mw each 7.5 V DC - 20 mw 24 V DC - 1 mw 24 V DC - 11 W 24 V/ Hz - 14 W 230 V/ Hz - 14 W 2

3 Table 2 Kvs values Table 2a Survey (with Flow Divider St I (KVSI) or St III (KVSIII)) Kvs Kvs I K vs III Seat- mm Stroke mm Terms: Noise calculation according VDMA (ed. May 1979); z values according Information Sheet T 8000 E Control valve sizing according DIN IEC 534 part 2-1 and 2-2: FL = 0.95, x T = 0.75 Table 2b Versions without Flow Divider Versions in shadowed fields are also available with balanced valve plugs Kvs DN Table 2c Versions with Flow Divider St I Versions in shadowed fields are also available with balanced valve plugs K vs I DN Tabelle 2d Versions with Flow Divider St III Versions in shadowed fields are also available with balanced valve plugs K vs III DN Notes on Table 3 and 4 All pressures in bar (gauge) Medium flow directed against the closing direction of the valve plug (air--open valve). Valve fully closed at 0 bar. The permissible operating and differential pressures specified (p and p, resp.) are limited by the values specified in Table 1. Values specified in the shadowed columns correspond the bench range. Differential pressures specified in the white columns apply maximum pre-tensioned springs. Differential pressures enclosed in parentheses in the table refer the values enclosed in parentheses in the row "Bench range". Only on-off valves and versions for bench ranges and bar with a required supply pressure <= 1.4 bar can be used without positioners. Positioners are required in all other cases! Table 3 Valves with balanced plug and PTFE ring (up 220 C) Bench range Required supply pressure DN Kvs Seat mm Actuar cm 2 p and p

4 Table 4 K vs values Permissible operating and differential pressures Bench range for actuar area 80/240 cm /700 cm cm ( ) ( ) ( ) ) Required supply pressure DN K vs Seat mm and Actuar cm 2 p and p (40) (40) (40) (40) (40) (40) (40) (40) (40) (40) (23) (31) (36) (14.1) (19.2) (22) ) Bench range , relieved Ordering text Pneumatic Control Valve Type 241-1/ Type typetested Globe Valve Type 241, DN..., PN..., K vs... Body material... Characteristic: Equal percentage/linear/on-off With/without extension bonnet Pneumatic Actuar Type 271/Type 3277 Effective diaphragm area:... cm 2 Bench range:... bar Optional attachment of a pneumatic/electropneumatic positioner or an electric/pneumatic limit switch Solenoid Valve Type... Power supply: 24 V- / 24 V, Hz / 220 V, Hz 4

5 Dimensions in mm and weights for the Type and Type Control Valve Standard version with Type 271 or Type 3277 Pneumatic Actuar Nominal size DN Length L H ) 415 1) H2 approx H Approx. weight in kg without actuar ) Only for body material cast iron GG-25 Pneumatic actuar cm ) Diaphragm Ø D H ) H3 (for Type 271 Pneumatic Actuar) 3) H3 (for Type 3277 Pneumatic Actuar) 3) Thread 30 (M30 x 1.5) Loading pressure connection (or vent) a G 1 4 (NPT 1 4) G 3 8 (NPT 3 8) Approx. weight in kg of the Type 271 Actuar 4) Approx. weight in kg of the Type 3277 Actuar 4) ) Only applies the Type 271 Pneumatic Actuar 2) Incl. lug 3) Minimum clearance for actuar disassembly 4) Top row without handwheel, botm with H3 ØD a H3 ØD a H H 100 H4 a2 H1 H1 H2 H2 L Type Control Valve with Type 271 Pneumatic Actuar on Type 241 Globe Valve L Type Control Valve with Type 3277 Pneumatic Actuar on Type 241 Globe Valve Type 241 Globe Valve with extension bonnet Specifications subject change without notice. 5

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