Adjustable Pressure Regulators


Adjustable Pressure Regulators

Adjustable Pressure Regulators

DIG’s direct acting adjustable pressure regulator is designed for an area where accurate and reliable control of line pressure is required. The pressure regulator reduces higher incoming pressure to lower constant downstream pressure regardless of fluctuating or varying upstream pressure. The pressure reading is triggered by a pressure reactive diaphragm, which seeks to reach a balance between hydraulic and spring assembly forces. The adjustable pressure regulator has excellent hydraulic performance capabilities and high mechanical strength and it is available with two reading options of 12 to 35 PSI and 28 to 60 PSI.


  • Adjustable with a single color coded screw
  • Accurate and stable regulation
  • Color coded
  • Rolling diaphragm keeps the spring assembly free of debris
  • Reliable control regardless of fluctuations in upstream pressure or flow
  • Constant downstream pressure
  • Immediate response
  • High mechanical strength
  • Highly durable, chemical resistant
  • Can be installed at any position


How to Specify
Adjustable pressure regulators
18-008 12-35 PSI
18-007 28-60 PSI


  • Flow rates: .88 to 22 GPM (.2 to 5 m3/h)
  • Pressure range: 12-60 PSI (.83-4.1 BAR)
    • White color code: 12 to 35 PSI (.83 to 2.4 BAR) *Red color code: 28 to 60 PSI (1.9 to 4.1 BAR)
  • Max. working pressure: 125 PSI (8.6 BAR)
  • Weight: .75 lb (.34 kg)
  • Temperature: Water up to 122°F (50°C)
  • 3/4" FNPT
  • Materials:
    • Body and actuator: Glass-filled nylon
    • Rolling diaphragm: NBR (Buna-N), nylon fabric reinforced
    • Spring: stainless steel 304


  • 4" H x 3.44" W (10 cm H x 19 cm W)

The pressure regulator is a critical part of drip and other irrigation systems when water pressure is higher than the suggested operation pressure recommended for the system. In most households the water pressure is between 40 and 100 PSI, with some homes being even higher. Typically, in homes with high pressure, a heavy-duty pressure regulator is installed on the main water supply to lower the pressure entering the house. Drip irrigation systems are designed to work at an even lower pressure than is set for the house, with the optimal pressure for a drip system between 15 and 30 PSI. If a higher pressure is found in a drip system, problems such as drip emitters popping off the drip or distribution tubing, high flow damaging the drip emitters or micro sprinklers, components blowing out of the drip tubing and distribution tubing, and overall shortening of system life can occur. To achieve extended life with high uniformity and lower maintenance, a pressure regulator is highly recommended to maintain optimum system pressure, regardless of any fluctuations in the house system pressure.

Installation suggestions

The point of connection to the high-pressure water supply can start from an in-line or anti-siphon valve, well or pump.

Installation into in-line valve or into a pipe thread

  1. If installation is into a PVC pipe, first shut off the main water supply.
  2. We recommend installing a 3/4″ ball valve or gate valve before the valve. This ball valve can be very useful as an emergency backup to turn the system off. This type of arrangement is used by professional installers.
  3. Turn the water supply on to flush the line and then shut the water supply off using the new ball valve or gate valve.
  4. Install the AC valve or battery-operated controller, wrapping TEFLON tape on all the male thread fittings used.
  5. Turn the water supply on again to pressurize the system. The unit will open momentarily and then will shut off.
  6. To the outlet of a drip irrigation zone, install a 3/4″ screen filter with 120 to 150 mesh for drip system protection. Next, add the adjustable pressure regulator that can be used to lower the incoming system pressure to any desired pressure between 28 and 60 PSI. Higher pressures may be used for conventional sprinkler systems. Follow with a 3/4″ PVC female thread x slip adapter to the PVC pipe.
  7. Test the valve using the manual bleed. Check that the system is working and that there are no leaks.

Note: to read the correct pressure, check the pressure at the end of the line or at the last drip emitter on the line. To adjust the pressure, turn the water off, remove the red cap (protecting the red screw) and turn the screw using a screwdriver, clockwise to reduce pressure or counter clock wise to increase it