Piston valve 835-M

hydraulichydraulically-operatedregulating

Overview Hydraulically operated, piston-actuated off-line surge-anticipating control valve 835-M (800 Series). The valve opens immediately in response to the pressure drop caused by abrupt pump stoppage to pre-open and dissipate the returning high-pressure wave, preventing surge. It closes smoothly and drip-tight as permitted by the relief feature to avoid closing surge, and it relieves excessive system pressure.

Features & Benefits

• Piston-actuated design — suitable for high-pressure service
• Line-pressure driven — independent operation without external power
• Elegant simplicity
  • Cost-effective solution
  • Low maintenance
  • Minimal external accessories
• In-line serviceable — easy maintenance and reduced downtime
• Double-chamber design
  • Moderated valve reaction
  • Controlled closing curve
• Flexible design — straightforward addition of optional features
• Semi-straight flow — non-turbulent flow path for improved hydraulic performance
• Stainless steel raised seat — cavitation-resistant
• Obstacle-free full bore — reliable, unobstructed flow
• Optional V-Port throttling plug — stable control at low flow

Typical Applications

• Pumping stations — surge control and surge relief

Technical specifications

• Model: 835-M
• Series: 800 Series
• Product type: Surge-anticipating control valve
• Actuation: Hydraulically operated, piston-actuated
• Flow stem: Mechanical Flow Stem
• Design: Double-chamber
• Seat: Stainless steel raised seat (cavitation-resistant)
• Flow path: Semi-straight flow, obstacle-free full bore
• Optional: V-Port throttling plug for low-flow stability
• Serviceability: In-line serviceable, easy maintenance
• Typical use: Pumping stations for surge control and surge relief
• Internal product code / barcode: 30587
• Available documentation: Product Page (Metric & Imperial), IOM, 800 Series Ordering Guide, 800 Series Engineering documents, CAD resources