Type 447

Safety Valves for Critical Service Conditions
Type 441

Type 447

Safety Valves for Critical Service Conditions

In chemical plants, critical service conditions and media may occur which place special demands on the design of safety valves, e.g.

  • Highly Corrosive Media

  • Highly Toxic Media

  • High Back Pressure


    •
    LESER has developed three series of safety valves for these applications

    Type 447

    Safety valve with full PTFE lining for protection from highly corrosive media. The PTFE bellow is gastight and back-pressure compensated. Adherence is avoided by the smooth PTFE surfaces.

    Applications
    Chlorine manufacture and processing
    Reducing acids (e.g. hydrochloric acid, acetic acid)
    Alkalis (e.g. NaOH solution)



    Type Set Pressure Range Flange ANSI B 16.5 Flange DIN 2501
    (bar) (psig) PR NPS PN DN
    447 0.1...16 1.5...235 #150 1"...4" 16 25...100



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    TYPE 431 433
    TYPE 441_442
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    TYPE 437 459 462
    TYPE 483 484 485 488
    TYPE 447
    TYPE 310 311

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