Samson 4765 Mounting And Operating Instructions
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Samson 4765 Mounting And Operating Instructions

Samson 4765 Mounting And Operating Instructions

Pneumatic positioner
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Pneumatic Positioner
Type 4765
Fig. 1 · Type 4765 Positioner
Mounting and
Operating Instructions
EB 8359-1 EN
Edition April 2008

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Summary of Contents for Samson 4765

  • Page 1 Pneumatic Positioner Type 4765 Fig. 1 · Type 4765 Positioner Mounting and Operating Instructions EB 8359-1 EN Edition April 2008...
  • Page 2 Contents Contents Design and principle of operation ....6 Attachment ....... 8 Attachment to valves with cast yokes .
  • Page 3 Safety instructions General safety instructions The positioner is to be mounted, started up or operated only by trained and experienced personnel familiar with the product. According to these Mounting and Operating Instructions, trained personnel refers to individuals who are able to judge the work they are assigned to and recognize possible dangers due to their specialized training, their knowledge and experience as well as their knowledge of the applicable standards.
  • Page 4 Versions Pneumatic Positioner Type 4765- Range spring Range spring 1, travel = 15 mm Range spring 2, travel = 30 mm, split-range 15 mm Range spring 3, travel = 60 mm, split-range 30 mm Pneumatic connections ISO 228/1 G ¼...
  • Page 5 Type 4765 Positioner Travel range 7.5 to 60 mm, with 90 mm lever extension Reference variable 0.2 to 1 bar Split-range 0 to 50 % 0.2 to 0.6 bar and 0.6 to 1 bar and 50 to 100 % (up to 50 mm travel)

  • Page 6: Design And Principle Of Operation

    Design and principle of operation The positioner operates according to the Design and principle of force-balance principle. In this way, the operation stroke of the actuator stem or the plug stem (controlled variable x) is transmitted to the The pneumatic positioner is used for the cor- lever (1) and the range spring (6) by the relation between the valve stem position plate (20).
  • Page 7 Design and principle of operation Any changes of the input signal p or the ing the plug stem to take on a position cor- valve stem position cause the pressure up- responding to the reference input variable. stream and downstream of the booster to The adjustable tuning restrictions (13 and change.

  • Page 8: Attachment

    Attachment Attachment 2.1 Attachment to valves with cast yokes To attach the positioner to valves with cast yokes, mounting parts (order no. 1. Fasten the plate (20) to the stem connec- 1400-5745) are used. For valves with tor clamps (22) of the valve using the rod-type yokes (pillars), the mounting kit (or- screws (21).

  • Page 9: Attachment To Valves With Rod-Type Yokes

    Attachment 4. Mount the positioner to the support using 2.2 Attachment to valves with the mounting screw (15). Make sure that rod-type yokes the pin (2) is led inside the wire strap and therefore clamped against the plate 1. Screw the plate (20), off-centered, to the (20).

  • Page 10: Connections

    Connections Connections Actuator stem extends (FA) Fail-safe position Valve CLOSED 3.1 Pneumatic connections (for globe and angle valves) Required supply pressure = The pneumatic connections are designed as Upper bench range value + 0.2 bar, tapped holes with ¼ NPT or ISO 2228/1- minimum 1.4 bar.

  • Page 11: Operation

    Operation Operation 4.1.1 Determining/reversing the operating direction 4.1 Combining positioner and When the input signal (reference variable w) actuator increases, the signal pressure p can either be increasing (direct operating direction <<) The arrangement of the actuator, input sig- or decreasing (reverse operating direction nal, operating direction and mounting loca- <>).

  • Page 12: Starting Point And Input Signal (Reference Variable)

    Operation If the operating direction of the required 4.2 Starting point and input function does not match the symbol or if the signal (reference variable) operating direction is to be changed, proceed as follows: The attached lever and the installed range spring of the positioner correspond to the 1.
  • Page 13 Table 1 Rated travel [mm] Min./max. travel [mm] Reference variable (input signal) Range spring Standard travels for SAMSON valves with lever I (40 to 127 mm long) 100 % 7.5 to 15 50 % 100 % 14 to 32...

  • Page 14: Setting The Positioner At The Valve

    Operation adjustment screw (4) until the valve is at 4.3 Setting the positioner at the approximately 50 % valve travel. valve On setting the Xp restriction, observe the re- Connect the control signal input to a lationship with the supply air pressure as in- compressed air source of max.

  • Page 15: Setting Actuator Version "Stem Extends

    Operation 4. Move pin to: 4.3.2 Setting actuator version End of lever –> to increase travel “Stem extends” Pivot –> to reduce travel If the span is corrected, the zero must be Note: recalibrated. Afterwards, the span must also To ensure that the total closing force of the be checked.

  • Page 16: Exchanging The Range Spring

    Operation 2. Increase the instrument input signal and 4.4 Exchanging the range spring gradually decrease again to 1 bar, checking whether the control valve be- If the range is to be altered or changed to gins to move at exactly 1 bar. split-range operation, replace the range spring as shown in Fig.

  • Page 17: Converting A Pneumatic Positioner

    Converting a pneumatic positioner Converting a pneumatic Type 6112 i/p converter module: positioner 3. Place the i/p module on the plug of the printed circuit board, and tighten the The pneumatic positioner can be converted side terminal screws. to a Type 4763 Electropneumatic Positioner 4.
  • Page 18 Converting a pneumatic positioner Cable gland Printed circuit board i/p module Connecting nipple Hose Connecting plate Sealing element Fig. 14 · Converting the positioner EB 8359-1 EN...

  • Page 19: Accessories, Mounting Parts And Conversion Kits

    Accessories, mounting parts and conversion kits Accessories, mounting parts and conversion kits Table 2 Accessories – Mounting parts Order number Range spring 1 1190-0736 Range spring 2 1190-0737 Range spring 3 1190-0738 Lever I 1690-6469 Lever extension 1400-6716 Pressure gauge attachment 1400-6950 Pressure gauge attachment, free of copper 1400-6951...

  • Page 20: Dimensions In Mm

    Dimensions in mm Dimensions in mm Tapped hole G for G threaded connection or NPT for NPT threaded connection Useable lever length I: 40 to 127 mm (with 40 to 200 mm lever extension) Pneum. connection: ISO-228/1-G ¼ or ¼-18 NPT EB 8359-1 EN...
  • Page 21 EB 8359-1 EN...
  • Page 22 EB 8359-1 EN...
  • Page 23 EB 8359-1 EN...
  • Page 24 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany Phone +49 69 4009-0 · Fax +49 69 4009-1507 EB 8359-1 EN Internet: http://www.samson.de...

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