MFI: 320 cm² / MFIII: 720 cm²

Transcription

1 TD_8 General Data Series 8 effective area MFI: cm² / MFIII: 7 cm² Control signal Materials Spring chamber Operating temperature - mm max. Actuator housing:. powder coated (option: stainless steel.) plate: MFI-. galvanized, MFIII-.7 galvanized Yoke:. (option: stainless steel.8) Stem:. (option: Duplex.) Springs:. plastic-covered : NBR fabric-reinforced (moulded) Sealing element: high-quality, special polyurethane Optionally with instrument air purge - C to +8 C (Option - C to + 8 C) MFI: -7 / MFIII: - Air connections Connection Z: G⅛; Connection Z: MFI: G⅛ / MFIII: G¼ Control force spring max. Control force air max.,8 kn,, kn Functional description The ARCAPAQ is a pneumatic multi-spring diaphragm actuator with spring return (fail safe) and is used to actuate linear valves. The actuator positions the valve plug in dependence of the signal pressure acting upon the actuator diaphragm, which in turn is controlled by a pneumatic or electro-pneumatic positioner. These actuators can be operated in the "air to open" function or with the reverse action "air to close". The actuator has a compact design with a low installed height. Various spring sets with different bench ranges ensure good adaptation to the particular operating conditions. A fabric-reinforced rolling-diaphragm ensures smooth conversion of the pneumatic signal pressure into the linear motion of the actuator stem. The diaphragm (), supported by the diaphragm plate (), is connected to the actuator stem (8) and separates the actuator housing () into pressure and spring chamber. If the force of the pneumatic signal pressure exceeds the opposing spring force (), the actuator stem (8) moves and actuates the reciprocating valve. The signal pressure is routed to the diaphragm chamber via internal channels in the yoke (). The air vent of the spring chamber is done by means of the protective cap (), which is impermeable to splash water. Optionally the spring chamber can be purged with instrument air from the positioner either through internal channels or by outside tubing. The yoke () connects the actuator to the control valve. The actuator stem (8) is connected to the valve stem via the coupling (), which also acts as a stroke indicator, and is securely guided in the slide bearing () and sealed with a special sealing element (7) with wiper ring. splash-proof protective cap Actuator housing Spring plate Slide bearing Special sealing element Actuator stem indicator Yoke ARCA Regler GmbH Kempener Strasse 8 D-78 Tönisvorst Tel.: +-()-77- Fax: +-()-77- sale@arca-valve.com TD_8_en_-8.docx - Subject to technical modifications - Page of

2 TD_8 Control forces and control ranges Opening function (air to open - spring to close) surface Type MFI MFI-(v) 8-.. MFI MFIII MFIII-(v) MFIII Control range Control force from () to ( (kn),7,,,,,8,,,,,, 7,, 7,,7,,,,,8,7,,,,8,7,,,, 7,,,,7,,,,7,,,,7,,, Force diagram (page ) IA IB II IIIA IIIB IV Closing function (air to close - spring to open) MFI- surface Type MFI-(v) 8-.. MFI MFIII MFIII-(v) MFIII Control pressure Control force (kn) depending on control pressure min.,,,,,,,,8 8,,,, - -,,,, -,8 8,,,, - -,,, 7, - -,,8 8,,,,8 8,,,, - -,,,,,,8 8,,, - - 7,,,,7 - -,,,, - - -,,,,,,8 8,, -,7,, 7,, -,8 7,,, - -,,,8,,,8 8,,, - - 7,,,, - -,, 7,, - - -,, ARCA Regler GmbH Kempener Strasse 8 D-78 Tönisvorst Tel.: +-()-77- Fax: +-()-77- sale@arca-valve.com TD_8_en_-8.docx - Subject to technical modifications - Page of

3 TD_8 Dimensions and weights M=Thread of particular valve stem surface Type Weight Ø D M actuator Ø d S A B H HV Ø R 8-.. MFI MFI-(v) 8-.. MFI MFIII MFIII-(v) MFIII M Mx, ARCA Regler GmbH Kempener Strasse 8 D-78 Tönisvorst Tel.: +-()-77- Fax: +-()-77- sale@arca-valve.com TD_8_en_-8.docx - Subject to technical modifications - Page of

4 TD_8 Force diagrams IA MFI- IB MFI-(v) Springs Springs Air pressure () 7 Springs Springs Springs Air pressure () IIIA MFIII- II MFI- Springs Springs Air pressure () Springs Springs Springs Springs Air pressure () IIIB MFIII-(v) IV MFIII- Springs Springs Springs Air pressure () Springs Springs Springs Air pressure () Springs Springs ARCA Regler GmbH Kempener Strasse 8 D-78 Tönisvorst Tel.: +-()-77- Fax: +-()-77- sale@arca-valve.com TD_8_en_-8.docx - Subject to technical modifications - Page of

5 TD_8 Type code Series Actuator size MFI diaphragm surface cm² MFIII diaphragm surface 7 cm² Yoke (ø = adapter in mm) w/o ø ø8 ø ø7 special Hub mm mm mm Spring set = (7) = (7) = = Material of diaphragm chamber N = diaphragm head steel / yoke steel A = diaphragm head steel / yoke stainless steel V = diaphragm head stainless steel / yoke stainless steel Function O = move the stem downwards (air to open) S = move the stem upwards (air to close) Execution B = actuator reversible, w/o spring chamber purge E = actuator reversible, with integrated spring chamber purge Extra equipment AP B FG S SD VB X Z = w/o = stroke limitation in the opening direction = low temperature - C = air connection G /" = screws stainless steel (long) = outer parts in stainless steel passivated = stroke limitation adjustable for both direction O/S = spring cover 8 rotated = on/off actuator = stem. (Duplex) = for VDI/VDE-mounting = XYLAN circumferential screws = ASME design Handwheel = w/o HV = with handwheel (can not be combined with and B 8 - N- O B -HV ARCA Regler GmbH Kempener Strasse 8 D-78 Tönisvorst Tel.: +-()-77- Fax: +-()-77- sale@arca-valve.com TD_8_en_-8.docx - Subject to technical modifications - Page of