Piston valve 820-PP

hydraulicpilot-operatedisolation

Overview
Hydraulically operated proportional pressure reducing valve with piston actuator that reduces higher upstream pressure to a lower downstream pressure at a fixed ratio. The fixed reduction ratio is defined by valve size and plug type.

Series / Segment
800 Series. Segments: Waterworks; Buildings & Construction.

Key Features & Benefits

• Piston-actuated construction for high-pressure service
• Line-pressure driven pilot — independent operation without external power
• Simple, serviceable design
  • Cost-effective implementation
  • Easy in-line maintenance
  • Minimal external accessories required
• Built-in check feature — replaces a line-sized check valve
• In-line serviceable — straightforward maintenance and inspection
• Double-chamber design
  • Moderated valve reaction
  • Smooth, moderated closing curve
• Flexible design — facilitates addition of optional features
• Semi-straight flow path — reduced turbulence
• Stainless steel raised seat — cavitation damage resistant
• Obstacle-free full bore — uncompromised flow capacity
• Optional V-Port throttling plug — stable control at low flow

Typical Applications

• First stage in two-stage pressure reducing systems
• Municipal and national networks — pressure reduction in downhill pipelines
• Pumping stations — minimize cavitation and noise in circulation valves

Design & Operation Notes

• Hydraulically operated with piston actuator designed for high-pressure service
• Fixed pressure reducing ratio determined by valve size and plug type
• Line-pressure driven pilot/control provides independent operation without external power
• Double-chamber layout and moderated closing reduce water hammer and ensure stable response

Technical Specifications

• Commercial designation (model): 820-PP
• Series: 800 Series
• Actuator type: Piston actuated
• Operation: Hydraulically operated, line-pressure driven
• Flow pattern: Semi-straight / non-turbulent
• Seat: Stainless steel raised seat (cavitation resistant)
• Design features: Double-chamber design; built-in check feature (replaces line-sized check valve); obstacle-free full bore
• Optional: V-Port throttling plug for stable low-flow performance
• Service: High-pressure service; in-line serviceable for simplified maintenance
• Typical uses: Pressure reduction (first stage of two-stage systems), downhill pipeline pressure control, pump station protection
• Internal product code / barcode: 30551