- HELP -

       This screen calculates required orifice area for liquid sizing.
       Flow through the valve is sub-sonic.  This formula recognizes
       that constant backpressure (P2) has a direct affect on set
       pressure and rated flow capacity for a conventional spring-
       return SRV. However, AGCO Pilot-Operated SRV's are balanced
       against the affects of constant backpressure.  Therefore, no
       backpressure correction factor (Kp) is used in the calculation.
       Kp = 1.00. Likewise, the AGCO Type 81P is balanced until
       backpressure exceeds 50% of set pressure, at which time Kp is
       recognized.
 
       VISCOSITY Correction Factor

       The program automatically calculates the correction factor
       when viscosity is entered in centipose. To convert SSU to
       CP, multiply SSU x 0.22. For optimum performance, maximum
       viscosity of the lading fluid should be limited to 3000 SSU,
       Saybolt Universal Seconds (about 40 wt. oil @ 70 deg. F), or
       660 CP.

       
                             ORIFICE AREAS

       VALVE SIZE         TYPE 81P    PILOT-OP (400/600)   TYPE 526

       3/4" x 1"         0.049 (-4)
       & 1" x 1"         0.196 (-8) 
         1" x 2"                        0.326 (F)
      1-1/2" x 2"        0.503 (G)      0.326 (F)
      1-1/2" x 3"                       0.615 (G)          0.841 (H)
         2" x 3"         0.503 (G)      1.371 (J)          1.375 (J)
                         1.287 (J)
                                      * 2.530
         3" x 4"                        1.487 (J)               
                                        2.218 (K)
                                        3.062 (L)          3.073 (L)
                                      * 6.651
         4" x 6"                        3.603 (L)
                                        4.482 (M)
                                        5.185 (N)
                                        6.824 (P)          6.848 (P)
         6"x 8"                        12.671 (Q)
                                       17.087 (R)         17.149 (R)
         6" x Dual 8"                * 21.520
         8" x Dual 8"                * 29.420
         8" x 10"                      27.813 (T)         27.913 (T)
         8" x Dual 10"               * 44.180
 
         * Denotes series 70 Full Bore Valve.


                              End of Help Screen


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