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Regulators: Back Pressure

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Description Back Pressure Regulators are used to control pressure upstream of the regulator or to relieve excess pressure.  These devices are frequently used in pump applications to maintain a minimum flow through the pump when it would otherwise be deadheaded.  Watson McDaniel manufactures single seated, self contained back pressure regulators for water, oil, and air service (Series 3040 and Series R).  For steam applications use the Series DBP pilot operated back pressure regulator. Series 3040 The Series 3040 are Relief or Back Pressure Regulating Valves for liquid or air, capable of controlling inlet pressures up to 125 psig.  Bodies are bronze with 1/2" thru 2 1/2" connections and Buna N seats or Teflon for tight shut off.  Typical services include system pressure control, balancing, and pump bypass relief. Series 3040 Capacities: to 388 gpm [1470 l/min] Maximum inlet pressure: NPT - 300 psig [20.7 bar] 125 lb Flg - 125 psig [8.6 bar] 250 lb Flg - 250 psig [17.2 bar] Reduce pressure range: 1 to 125 psig [0.1 to 8.6 bar] with 4 springs Sizes: 1/2" to 2-1/2" Connections: NPT - 1/2" to 2" 125 lb Flg - 2" and 2-1/2" 250 lb Flg - 2" to 2-1/2" Body material: Bronze - 1/2" to 1-1/2" Cast iron - 2" and 2-1/2" Stainless steel valve seat with elastomeric plug Weight: 10 to 85 lbs [5 to 39 kg]   Series R The R Series are Relief or Bypass Valves for liquid or air capable of controlling inlet pressures up to 300 psi.  Bodies are cast bronze 1/2" thru 3" angle design with either bronze or optional Buna N seats for leak free service.  Typical service include system pressure control, balancing, and pump bypass relief. Series R Capacities: to 16 gpm [61 l/min] Maximum inlet pressure: 300 psig [20.7 bar] Reduce pressure range: 1 to 300 psig [0.1 to 20.7 bar] with 4 springs Sizes: 1/2" to 3" Connections: NPT Body material: Bronze Internals:  Stainless steel ball with bronze seat - 1/2" to 1-1/2" Bronze plug and seat - 2" to 3" Weight: 1-1/2 to 25 lbs [1 to 11 kg]