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DK Series
Check Valves
Specifications                                                    Flow Data
                                                                  100
                                                                   90
                                                                   80
                                                                                                       DK500
                                                                   70
                                                                         DK370
    C                  FREE FLOW                      F    A       60
                                                                   50
                                                                   40
                                                                   30
                    45°                                            20
   G                                    E
                                                         D
                                                                   10
                             B
                                                                    0              5             10             15             20
                                                                                                 GPM
                                                                 PSIDinDropPressure
                                                                                                                     CRACK
    PART     NOMINAL       A*         B*       C     D    E      F*      G     O-RING      NET      OPERATING      PRESSURE
   NUMBER      SIZE       DIA.                DIA.              DIA.            SIZE     WEIGHT     PRESSURE         RANGE
    DK-370     3/8"     .655 (Max)  1.225 (Max) .19 .13  .11  .543 (Max)  .09   015       .03 KG     3,000 PSI      585 PSI
                        .650 (Min) 1.215 (Min)                .538 (Min)
    DK-500     1/2"     .811 (Max)  1.500 (Max) .30 .13  .11  .699 (Max)  .09   017       .07 KG     3,000 PSI      5100 PSI
                        .806 (Min) 1.490 (Min)                .695 (Min)
 * Min & Max designates manufacturing tolerance range.
                                                                  Ordering Information
Check Valves                                                      DK Series
D K -    -  
                                                      Standard Crack Pressure is 5 PSI.
                                                      Designate in 5 PSI increments.
                                                      Not to exceed Crack Pressure Range
                                                      for designated size.
                                                      Example: 5 = 5 PSI, 10 = 10 PSI.
 SERIES          SIZE
                 370 - 3/8"
                 500 - 1/2"
                                                                                                                                         EValvesCheck
                                                                                                     Quick Coupling Division
                                                                                     8145 Lewis Road · Minneapolis, MN 55427
                                                             E-15
                                                                                                www.parker.com/quickcouplings