Dorot S80 QR Series Reinforced Nylon Hydraulic Angle Quick Relief Valve

The Dorot S80 QR Series Quick Relief Valve is a compact, pilot-operated hydraulic solution designed to protect irrigation systems, filtration units, pump stations, and pipelines from overpressure and surge events. Engineered for rapid response and dependable performance, this valve instantly opens when system pressure exceeds a preset limit—safeguarding critical infrastructure from pressure spikes and water hammer.

Constructed from high-strength reinforced nylon, the S80 QR valve is corrosion-resistant, UV-stable, and suitable for long-term use in harsh agricultural or industrial environments. Its quick-opening and slow-closing hydraulic design ensures accurate pressure relief while preventing secondary surges during re-closure.

The S80 QR Series is ideal for remote field applications, offering precise pressure regulation and a leak-proof, maintenance-friendly design—all in a lightweight angle body that simplifies installation.

FEATURES

• Function: Basic Quick Pressure Relief
• Valve Type: Angle-pattern, pilot-operated
• Relief Trigger: Pilot opens valve instantly at preset pressure threshold
• Available Sizes: DN50 Threaded 
• Pressure Rating: PN10
• Operating Pressure: 0.7 – 10 bar (10 – 145 psi)
  
• Maximum Temperature: 70°C (160°F)
• Settable Relief Range: 1 – 9 bar (15 – 130 psi)
• Control Chamber Volume:
• Materials
  • Body & Bonnet: Reinforced Nylon (GRP)
  • Diaphragm Assembly: Natural Rubber (NR) + GRP
  • Spring: Stainless Steel 302
  • Pilot Bonnet: Reinforced Nylon (GRP)
  • Control Tubing: Polypropylene (PP)

BENEFITS

• Instantly relieves excess pressure to protect pumps, filters, and pipelines
• Pilot-operated design ensures accurate and reliable response
• Fast-opening and controlled closing prevent secondary water hammer
• Compact, lightweight valve body simplifies installation
• Ideal for irrigation, mining, and corrosive fluid environments
• No external power required – fully hydraulic operation
• Available factory preset or field-adjustable with simple hand tools
• Leak-proof design with long-lasting corrosion resistance

SPECIFICATIONS

• Max. Pressure: 10 bar (145 psi)
• Min. Operating Pressure: 0.7 bar (10 psi)
• Recommended Min. Flow: 1 m³/h (5 gpm)
• Max. Fluid Temperature: 70°C (160°F)
• Materials:
• Body & Bonnet: Reinforced Nylon
• Diaphragm: Natural Rubber
• Spring: Stainless Steel 302