Adjustable Pressure Regulator


Adjustable Pressure Regulator

Adjustable Pressure Regulator

DIG’s PRV075, 28 to 60 PSI adjustable pressure regulator (pipe thread) is used to reduce and regulate the incoming pressure of the water entering a drip irrigation or micro sprinkler system to the appropriate operating pressure range of 28 PSI and up. The wide range of adjustable pressures allows for flexibility in operating range for all types of irrigation systems. The pressure regulator has a design that includes a plastic screw used for pressure adjustment, a stainless steel spring and a rolling diaphragm housing assembly, which regulates itself depending on the position of the screw in reaction to the overall system back pressure. The pressure regulator offers exceptional control and provides consistent outlet pressure over a wide range of incoming pressures.


  • Adjustable range with a single screw
  • Rolling diaphragm keeps the spring assembly free of debris
  • Reliable control regardless of fluctuations in upstream pressure or flow
  • Available with 3/4” female pipe thread inlet and outlet to fit all standard 3/4” pipe thread connections
  • Reduces incoming water pressure to the ideal working pressure for a drip system
  • High-strength ABS construction for durability
  • Compact construction of non-corrosive plastic materials
  • Low pressure loss and high flow rate
  • DIG’s drip irrigation products may be exempt from residential and commercial watering restrictions (check local codes)


How to Order
PRV075 Adjustable Pressure Regulator 3/4 in. FNPT x 3/4 in. FNPT


  • Operating pressure: up to 125 PSI
  • Flow rate: up to 2 to 22 GPM
  • Adjustable pressure range: 28 to 60 PSI
  • Size: 3/4” female pipe thread x 3/4” female pipe thread ( FNPT x FNPT)
  • Color: black
  • Temperature range: up to 130°F
  • Weight: .75 lb.
  • Materials:
    • Body and actuator: plastic
    • Rolling diaphragm: nylon reinforced neoprene
    • Spring: stainless steel 304
  • Dimensions: 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 micro tubing, high flow damaging the drip emitters or micro sprinklers, components blowing out of the drip tubing and micro 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 water supply can start from an in-line or anti-siphon valve, well, pump, or rain barrel combined with a gravity feed.

Installation into in-line valve or into 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 the valve, install a 3/4” screen filter with 155-mesh to protect the drip system from clogging. Next, add the adjustable pressure regulator to lower the incoming system pressure to any desired pressure between 28 and 60 PSI; 28 to 30 PSI is the range of recommended pressures for drip irrigation or micro sprinkler systems. 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, clock wise to reduce pressure or counter clock wise to increase it