Dorot S100 PS Series Cast Iron Basic Hydraulic Pressure Sustaining Valves with 3-Way Selector

The Dorot S100 PS Series is a pilot-operated cast iron pressure sustaining valve designed to automatically maintain a minimum upstream pressure in water supply and irrigation systems. This ensures stable operation of upstream filters, pumps, and zones even during peak demand. Engineered for consistent performance in fluctuating flow conditions, this model comes equipped with a 3-Way Pressure Selector Valve—allowing field operators to easily switch between automatic control, manual open, or manual closed modes without tools or disassembly.

The S100 PS uses a diaphragm-actuated main valve controlled via a pressure-sustaining pilot, which modulates the valve position based on upstream pressure. The addition of the 3-way selector enhances serviceability, making commissioning, maintenance, and emergency operation quicker and safer in the field.

Constructed from heavy-duty cast iron, the S100 PS valve offers reliable, corrosion-resistant performance and is compatible with a wide range of Dorot control accessories for customized functionality.

FEATURES

• Function: Hydraulic Pressure Reducing
• Body Style: Globe-pattern (inline flow)
• Available Sizes: DN50 to DN150 (2" – 12")
  
• 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
• Relay Valve Manual Override: Built-in 3-position selector

BENEFITS

• Automatically maintains minimum upstream pressure for pump, filter, or network protection
• Integrated 3-way selector provides instant manual override for field servicing
• Compact, inline body with high flow capacity and low head loss
• Durable cast iron construction with corrosion-resistant coating
• Easy to install and maintain with direct-sealing diaphragm design
• Ideal for zone regulation, filtration heads, and pressure-sensitive system components
• Fully compatible with Dorot pilots, solenoids, and remote control accessories