Page 220 - Valve Selection Handbook
P. 220

Pressure Relief  Valves                207


                                               Figure 5-39.  Pilot-Operated
                                               Pressure Relief Valve, Pilot-Balanced,
                                               Non-Flowing Modulating. Action.
                                               Application:  Gas, LiquiaandTwo-
                                               Phase Fluids. (Courtesy of Anderson,
                                               Greenwood & Co.)

















































          Figure 5-40. Pilot-Operated  Pressure Relief Valve, Pilot Nonflowing, Snap Action
          Type. Application Primarily for  Gas, in Particular, Steam. This Includes Severe Service
          Where Dirt, Hydrates, ana High Moisture Levels Occur in the Fluid Medium. Set
          Pressures 25 to over 6000 psig (1.7 to over 400  barg), Continuous Service
          Temperature -423°F to +500°F  (-253°C to 260°C).  (Courtesy of Anderson,
          Greenwood & Co.)
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