Dorot S100 PR Series Cast Iron Basic Hydraulic Pressure Reducing Valves with 3-Way Selector

The Dorot S100 PR Series with 3-Way Selector is a pilot-operated, cast iron hydraulic pressure reducing valve designed to automatically maintain a constant downstream pressure in irrigation, municipal, and industrial water systems—regardless of upstream pressure fluctuations. Featuring an integrated 3-way manual selector, this valve allows users to easily switch between automatic, manual open, and manual close modes—enabling quick field operation and maintenance flexibility.

Engineered around Dorot’s proven direct-sealing diaphragm design, the S100 PR delivers smooth and accurate modulation, minimal head loss, and long-lasting reliability in both clean and debris-laden water. The cast iron body is available in flanged, threaded, or grooved configurations and is coated for corrosion resistance in harsh environments.

This valve is ideal for applications requiring pressure regulation at irrigation zone inlets, filter banks, pump discharge lines, or pressure-sensitive water delivery systems.

FEATURES

• Function: Hydraulic Pressure Reducing
• Body Design: Straight-pattern body for compact installation and reduced pressure loss
• Available Sizes: DN50 to DN200 (1" – 8")
  
• Max Fluid Temperature: 60°C (140°F)
• End Connections: Threaded, Flanged
• Body Material: Cast Iron 
• Bonnet: Cast Iron 
• Diaphragm: Reinforced Natural Rubber (optional: NBR, EPDM, Neoprene)
• Spring: Stainless Steel 302 
• Coating: Polyester Epoxy, Rubber, or Nylon

BENEFITS

• Maintains constant downstream pressure regardless of inlet fluctuations
• Integrated 3-way selector enables full manual override—no disassembly needed
• Ideal for zone control, filtration heads, and distribution mains
• Fast and accurate response to flow and pressure changes
• High-strength cast iron construction with corrosion-resistant coating
• Simple diaphragm-based design ensures low maintenance and high reliability
• Compatible with a wide range of Dorot pilot valves and accessories
• Available in angle or globe body styles for flexible system design