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2015 Maxitrol Company. All Rights Reserved. DRAFT 09.18.2013 59 RUBBER SEAT POPPETS For main burner and pilot load applications. Example To select an RV type regulator Known Single 150000 Btuh main burner pipe size 12 inlet pressure 7 w.c. outlet pressure 4 w.c. Solution The RV48 12 has a maximum capacity of 230000 Bthh and a maximum individual load of 160000 Btuh.The pressure drop at a flow rate of 150000 Btuh is 0.4 w.c. well below the available differential of 3 w.c. The RV48 without L fixed orifice is the correct regulator to use for the application. STRAIGHT-THRU-FLOW S-T-F For main burner only applications not requiring a lockup type regulator. When sizing the S-T-F Series it is recommended that pressure drop not exceed 12 of available differential pressure. Example To select an RV type regulator Known Flow rate 2000000 Btuh pipe size 1 14 inlet pressure 9 w.c. outlet pressure 5 w.c. Solution The RV811 14 has a maximum capacity of 2500000 Btuh. The pressure drop at a flow of 2000000 Btuh is 0.66 w.c.The RV81 1 14 is the correct regulator to use with this application.The pressure drop of the RV61 1 14 at a flow rate of 2000000 Btuh is 2.64 w.c. This is within the available differential but exceeds the recommended 50 maximum. LEVER ACTING For main burner and pilot load application requiring positive dead-end lockup see Definitions page 63. Example To select a 325 Series regulator Known Single 145000 Btuh burner pipe size 12 inlet pressure 2 psi outlet pressure 7 w.c. Solution The 325-3s pressure drop at a flow rate of 145000 Btuh is 7 w.c. well below the available differential of 1 34 psi. The 325-3 12 is the correct regulator to use with this application. BALANCED VALVE For main burner and pilot load application requiring a lockup type regulator or zero governor usage see Definitions page 63. Example To select a 210 or RRS Series regulator Known Desired flow rate 6000000 Btuh pipe size 1 12 inlet pressure 1 psi outlet pressure 9 w.c. Solution The 210E 1 12 has a maximum capacity of 10000000 Btuh. The 210D 1 12 has a capacity of 6000000 Btuh. Therefore the 210E 1 12 will give you the desired outlet pressure of 9 w.c. and is the correct regulator to use for the application. SIZING A REGULATOR Sizing Examples