Samson 3351 Mounting And Operating Instructions
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Samson 3351 Mounting And Operating Instructions

Pneumatic on/off valve
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Type 3351 Pneumatic On/off Valve
Type 3351 Pneumatic On/off Valve
Type 3351 Pneumatic On/off Valve
Version with manual override
Mounting and
Operating Instructions
EB 8039 EN
Edition February 2014
Table of Contents
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Summary of Contents for Samson 3351

  • Page 1 Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve Version with manual override Mounting and Operating Instructions EB 8039 EN Edition February 2014...
  • Page 2 Definition of the signal words used in these mounting and operating instructions WARNING!  Note: indicates a hazardous situation which, Additional information if not avoided, could result in death or serious injury. EB 8039 EN...

  • Page 3: Table Of Contents

    Assembly (DN 15 to 80) ................. 10 Disassembly (DN 100) .................11 Assembly (DN 100) ..................12 Function test ....................12 Nameplate ....................14 Customer service ..................15 For dimensions and weights of Type 3351-1 Data Sheet T 8039 EN. Refer to the SAMSON website (www.samson.de) for more product documentation. EB 8039 EN...

  • Page 4: General Safety Instructions

    General safety instructions General safety instructions − The valve must be mounted, started up or serviced by fully trained and qual- ified personnel only; the accepted industry codes and practices are to be ob- served. Make sure employees or third persons are not exposed to any dan- ger.

  • Page 5: Process Medium And Scope Of Application

    Standard version for pressure rating PN 10 to 40 or Class 150 and 300, fail-close or fail-open Type 3351 · On/off valve with self-adjusting PTFE-V ring packing in nominal size DN 15 to 100 (NPS ½ to 4) for medium temperatures from –10 to 220 °C (14 to 428 °F) Type 3351 with bellows seal ·...
  • Page 6 Design and principle of operation Principle of operation Direction of flow The direction of the medium flow in the valve The connected pneumatic control pressure (5.8) opposes the force of the spring (5.5) to depends on the process medium and the se- open or close the valve.
  • Page 7 Design and principle of operation Type 3351 Pneumatic On/off Valve DN 100 version Fail-close Fail-open Fail-open R = 47 mm Fail-close R = 64 mm DN 15 to 80 version with handwheel G ¼ female Detailed view: thread Connection for control pressure DN 15 to 50 Version with bellows seal...

  • Page 8: Installation

    Installation Installation Maintenance – Replacing parts Install the control valve with the actuator in the upright position. See Fig. 1 on page 7. Flush and clean the pipeline thoroughly be- The on/off valve is subject to normal wear, fore installing the valve. especially at the seat and plug.

  • Page 9: Maintenance - Replacing Parts

    Maintenance – Replacing parts 2. Place spacer (approx. 5 mm thick) on the The procedures to disassemble the fail-close and fail-open valve are not the same as the spring plate as shown in Fig. 2. Place plug is located differently in the valves. mounting device on top and fasten using the three clamping nuts and bolts.

  • Page 10: Assembly (Dn 15 To 80)

    Maintenance – Replacing parts 6.2 Assembly (DN 15 to 80) 3. Undo threaded bushing (5.2) completely. Spray the lock nut (3.2) stuck to the plug 1. In the fail-close version, first place the stem with adhesive as well as the ends of plug in the body.

  • Page 11: Disassembly (Dn 100)

    Maintenance – Replacing parts will go on the plug. In the fail-close ver- plug stem in the fail-close version so that sion, continue to load the mounting de- its recesses are aligned with the cams of the seat. Insert the guide part of the seat vice gradually until its three stop bushings touch the diaphragm case.

  • Page 12: Function Test

    7. Place diaphragm plate on the end of the control pressure and can be adapted to the plug stem (3.1), while pulling the plug operating conditions by SAMSON before de- stem as far as it will possibly go out of the livery.
  • Page 13 Maintenance – Replacing parts Table 1: Special tools Special tool DN 65 and DN 80 DN 15 to 25 DN 32 to 50 DN 100 Valve size NPS ½ to 1 NPS 1½ to 2 NPS 2½ to 3 NPS 4 Tool Order no.

  • Page 14: Nameplate

    Nameplate Nameplate The nameplate includes all details required to identify the on/off valve. 3351- Type 3351 - Modification index Serial number Flow coefficient (K Seal Soft seal with PTFE/glass Soft seal with PTFE/stainless steel STV Pure Stellite Stellite faced Metal seal...

  • Page 15: Customer Service

    The addresses of SAMSON AG, its subsidiaries, representatives and service facilities world- wide can be found on the SAMSON website, in all SAMSON product catalogs or on the back of these Mounting and Operating Instructions. Please send your inquiries to: [email protected] To assist diagnosis, specify the following details (see section 7 and valve labeling): −...
  • Page 16 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8039 EN Internet: http://www.samson.de...

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