How To Select a Pressure Regulator

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Date: 
Wednesday, September 25, 2019

When selecting the right pressure regulator for an irrigation system, a couple of factors need to be taken into consideration:

  • System flow rate at the inlet and outlet of the system
  • Sprinkler pressure requirements and your overall system pressure
  • Any size and inlet/outlet connection constraints
  • Specific application needs such as those in wastewater or mining installations

Like sprinklers, pressure regulators are designed to operate at a specific flow and pressure range. Each model also comes in a set variety of thread types and sizes. Some pressure regulators are rated for use with effluent water, while others are specifically designed for use with chemical solutions. This would naturally limit your options when selecting a model. 

To select a Senninger pressure regulator, we recommend you scan the comparative chart below and use the above criteria to narrow down your options. 

But remember, you must also take your sprinkler’s flow and pressure range into consideration! If you are using a sprinkler like the i-Wob®2, which operates at a range of 6 to 15 psi (0.41 to 1.03 bar) and has a 3/4" NPT M connection, you'll notice that only three of the models below can actually be used with this sprinkler. 

Note that irrigation design software will provide the necessary parameters for pressure regulator selection. 

 

  PRLG PRL PSR-2 PMR-MF PR-HF PRU
  Flow Range
  0.5 - 7 gpm
(114 - 1590 L/hr)
0.5 - 8 gpm
(114 - 1817 L/hr)
0.5 - 15 gpm
(114 - 3407 L/hr)
2 - 20 gpm
(454 - 4543 L/hr)
10 - 32 gpm
(2271 - 7268 L/hr)
20 - 100 gpm
(4543 - 22713 L/hr)
  Preset Operating Pressure
  10 - 40 psi
(0.69 - 2.76 bar)
6 - 40 psi
(0.41 - 2.76 bar)
6 - 50 psi
(0.41 - 3.45 bar)
6 - 60 psi
(0.41 - 4.14 bar)
10 - 50 psi
(0.69 - 3.45 bar)
10 - 60 psi
(0.69 - 4.14 bar)
  Maximum Inlet Pressure
  120 psi
(8.27 bar)
120 psi
(8.27 bar)
130 psi
(8.96 bar)
140 psi
(9.65 bar)
130 psi
(8.96 bar)
140 psi
(9.65 bar)
  Inlet Sizes
  3/4" F hose 3/4" F NPT 3/4" F NPT 3/4" F NPT 1-1/4" F NPT 2" F NPT
  3/4" M NPT 3/4" F hose   1" F NPT 1-1/4" F BSPT 2" F BSPT
        1" F BSPT    
  Outlet Sizes
  3/4" M hose 3/4" F NPT 3/4" F NPT 3/4" F NPT 1" F NPT 2" F NPT
  3/4" M NPT     1" F NPT 1-1/4" F NPT 2" F BSPT
        1" F BSPT 1" F BSPT  
          1-1/4" F BSPT  

Pressure regulators require at least 5 psi (0.41 bar) above the preset pressure in order to regulate at that pressure. 

 

Going in-depth into pressure regulator fundamentals

Learn the fundamentals of pressure regulation with Senninger's free on-demand Pressure Regulation course on Hunter University. Learn how to install pressure regulators in different irrigation systems, select a model, identify wear issues, causes of pressure fluctuations and more.

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