Rain Bird PSI-M-25 pressure regulator with preset 1.8 bar outlet pressure

Constant 1.8 bar outlet pressure

The Rain Bird PSI-M-25 is a preset pressure regulator for irrigation systems that reduces water pressure to a relatively constant outlet pressure of 1.8 bar (25 psi). It is particularly suitable for drip and micro irrigation systems where controlled operating pressure is important for reliable and uniform water distribution.

The pressure regulator operates automatically and does not require manual adjustment. Changes in inlet pressure or water flow are compensated for within the specified operating range, helping to maintain the preset outlet pressure.

Ideal for drip and micro irrigation

Drippers, dripline, micro-sprays and other micro irrigation components are designed to operate within specific pressure ranges. Excessive water pressure can affect their performance and place unnecessary stress on connected components. The PSI-M-25 reduces the available supply pressure to 1.8 bar.

This makes the pressure regulator suitable for irrigation zones requiring reduced and controlled operating pressure. It can be installed upstream of a drip or micro irrigation zone.

Automatic pressure regulation

The PSI-M-25 uses a diaphragm-operated design together with a durable stainless steel spring. Pressure regulation is completely mechanical and requires no electrical power or connection to an irrigation controller. The outlet pressure is factory preset to 25 psi, corresponding to approximately 1.8 bar.

Unlike an adjustable pressure regulator, the required outlet pressure does not need to be manually set. This simplifies installation and prevents accidental adjustment of the intended pressure level.

¾" female connections

The Rain Bird PSI-M-25 features a ¾" female threaded connection at both the inlet and outlet. This allows the regulator to be integrated easily into a suitably configured irrigation system.

The specified direction of water flow must be observed during installation. The regulator is installed upstream of the drippers, dripline, micro-sprays or other irrigation components that require reduced water pressure.

Durable construction for irrigation systems

The housing is manufactured from rugged engineering-grade plastic. Together with the stainless steel spring, the regulator is designed for reliable use in irrigation systems. Rain Bird allows the regulator to be installed in both above-ground and below-ground applications.

The PSI-M-25 is part of the PSI-M Series with several preset outlet pressures, allowing the appropriate regulator to be selected according to the operating pressure required by the irrigation components.

Technical data and specifications

• Manufacturer: Rain Bird
• Series: PSI-M
• Model: PSIM25
• Product type: Pressure regulator
• Outlet pressure: 1.8 bar
• Outlet pressure US: 25 psi
• Pressure setting: Factory preset
• Inlet: ¾" female thread
• Outlet: ¾" female thread
• Flow range according to current Rain Bird specifications: 0.5-2.27 m³/h
• Operating principle: Diaphragm operated
• Spring: Stainless steel
• Material: Engineering-grade plastic
• Installation: Above or below ground
• Application: Drip irrigation, micro irrigation and irrigation systems requiring reduced operating pressure

Frequently asked questions about the PSI-M-25

What pressure does the PSI-M-25 regulate to?

The Rain Bird PSI-M-25 is factory preset to an outlet pressure of 25 psi, corresponding to approximately 1.8 bar.

Can I adjust the outlet pressure?

No. The PSI-M-25 is a preset pressure regulator. Its nominal outlet pressure is fixed and does not require manual adjustment.

Is the PSI-M-25 suitable for drip irrigation?

Yes. The PSI-M-25 is particularly suitable for drip and micro irrigation systems where components require reduced and controlled operating pressure.

What connection size does the PSI-M-25 have?

The pressure regulator has a ¾" female threaded connection at both the inlet and outlet.

Does the PSI-M-25 require electricity?

No. Pressure regulation is performed mechanically using a diaphragm. No electrical supply or connection to an irrigation controller is required.

What is the difference between the PSI-M-15, PSI-M-20 and PSI-M-25?

The models use the same basic operating principle but have different preset outlet pressures. The PSI-M-15 regulates to 1.0 bar, the PSI-M-20 to 1.4 bar and the PSI-M-25 to 1.8 bar.