25 and 30 PSI Heavy Duty Pressure Regulator


25 and 30 PSI Heavy Duty Pressure Regulator

25 and 30 PSI Heavy Duty Pressure Regulator

The HDPR-25, DIG’s heavy duty 3/4″ Preset Pressure Regulator, offers exceptional performance of pressure control and consistent preset pressure. Used to reduce and regulate the water pressure entering a drip irrigation or micro sprinkler system, this pressure regulator can lower the incoming pressure from as high as 150 PSI to a downstream pressure of 25 PSI at a flow range of .5 to 12 gallons per minute. Utilizing very few moving parts, the pressure regulator’s sophisticated diaphragm design regulates itself in reaction to the overall system back pressure. It is also engineered with extra thick industrial-strength plastic for operation under extreme conditions.


  • Exceptional control of outlet pressure provides consistent performance over a wide range of pressures
  • Low-to-medium flow for a wide variety of uses
  • Withstands severe water hammer
  • Available with 3/4″ female inlet and outlet thread
  • Unique design, utilizing a minimum amount of moving parts with a sophisticated diaphragm design
  • Reliable control of pressure regardless of fluctuations in upstream pressure or flow
  • Regulates itself in reaction to overall system back pressure.
  • Reduces incoming water pressure to the ideal working pressure for a drip system
  • Engineered with extra thick industrial-strength sidewalls using high-strength ABS plastic with all joints sonic welded into tamper-proof and impact-resistant housing
  • Install above grade (or below grade in a valve box), downstream from the system valve
  • Compact construction of non-corrosive plastic materials


How to Order
HDPR-25 25 PSI Heavy Duty Pressure Regulator
PR-30-HOSE 30 PSI, 3/4" Hose Thread Preset Pressure Regulator


  • Maximum working pressure: 150 PSI
  • Flow rate: from .5 to 12 gallons per minute
  • Pressure range: preset to 25 or 30 PSI
  • Maximum recommended flow rate: 12 gallons per minute
  • Inlet and outlet: 3/4" female pipe thread FIPT
  • Dimensions: 4.025" L x 1.845" D
  • Materials:
    • Body: chemical resistant, high strength ABS plastic
    • Diaphragm: EPDM
    • Spring: stainless steel


The HDPR-25 Preset Pressure Regulator is a critical part of drip and other irrigation systems when water pressure is higher than the suggested operational pressure recommended for the system. In most installations, water pressure can be between 40 and 100 PSI with some homes 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, higher flow from 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’s 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 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 or gate valve before the electric or battery operated 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 (model D55) to protect the drip system from clogging. Then add the HDPR-25 pressure regulator to lower the incoming system pressure to 25 PSI, which is within the range of recommended pressures for drip irrigation or micro sprinkler systems. Follow with a 3/4″ PVC female threaded 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.