Senninger® PMR Pressure-Master Regulator™ — 3/4in NPT(F) × 1in NPT(F) / 15 psi / Medium Flow

Senninger® PMR Pressure-Master Regulator™ — 15 psi / Medium Flow

The Senninger® PMR-MF (Pressure-Master Regulator, Medium Flow) is engineered to maintain a consistent preset 15 psi outlet pressure in sprinkler and drip irrigation systems experiencing variable inlet pressures. By eliminating pressure fluctuations caused by elevation changes, pipe friction loss, shifting system demand, or the activation of large water guns, the PMR-MF ensures uniform water application across every sprinkler head and emitter in the zone.

Constructed from high-impact thermoplastics with a stainless-steel compression spring, the PMR-MF is pressure-tested for quality and durability, exhibiting very low hysteresis and minimal friction loss across its 2-20 GPM flow range. The 3/4-inch NPT(F) inlet and 1-inch NPT(F) outlet provide flexible installation options in existing irrigation manifolds and headers. Available in multiple preset pressures and inlet/outlet configurations, the PMR series adapts to a broad range of commercial and controlled-environment irrigation designs.

Key Features & Benefits

• Preset 15 psi Outlet Pressure — Delivers consistent downstream pressure to optimize sprinkler nozzle performance and distribution uniformity.
• Medium Flow — 2-20 GPM — Covers the flow range of most individual zone or lateralruns in commercial irrigation layouts.
• 3/4in NPT(F) × 1in NPT(F) Connections — Standard NPT threading for straightforward integration into existing irrigation manifolds and PVC headers.
• Very Low Hysteresis — Maintains consistent outlet pressure as inlet conditions fluctuate without hunting or pressure overshoot.
• Stainless-Steel Spring — Corrosion-resistant internal component extends service life in outdoor and greenhouse environments with chemical exposure.
• Max 95 psi Inlet — Handles high-pressure supply lines while maintaining precise 15 psi output for sensitive emitters and sprinklers.

Who Should Use This

Greenhouse irrigation designers, drip and overhead irrigation installers, and commercial growing facilities with uneven terrain or variable supply pressure use the PMR-MF to protect sprinklers and emitters from pressure damage and to maintain design application rates. It is particularly valuable in multi-zone systems where pressure varies between zones due to elevation differences or pipe friction in long lateral runs.

Compatibility

3/4-inch NPT(F) inlet and 1-inch NPT(F) outlet. Max inlet: 95 psi. Preset outlet: 15 psi. Flow range: 2-20 GPM. Compatible with standard NPT-threaded PVC and metal irrigation fittings, ball valves, and manifold headers.

Frequently Asked Questions

Can this regulator be adjusted to a different pressure?

No — the PMR series uses factory-preset pressures. Select the preset pressure (e.g., 15, 20, 25, 30 psi) that matches your sprinkler or emitter design pressure at time of purchase.

What happens if inlet pressure drops below 15 psi?

Pressure regulators maintain outlet pressure at or below the preset value. If inlet pressure drops below the preset, the regulator will pass the lower pressure through — it cannot increase pressure above what the inlet supplies.

Is this regulator rated for chemical irrigation (fertigation)?

The thermoplastic body is compatible with dilute fertilizer solutions. Verify compatibility with concentrated or specialty chemicals before use in fertigation systems.

Can it be installed in either flow direction?

No — pressure regulators are directional. Install with flow in the direction indicated on the regulator body (inlet to outlet) to ensure correct pressure regulation.