Piston valve Model 835-M

hydraulically-operatedregulatingfor water

Product Overview
Hydraulically operated, piston‑actuated off‑line surge anticipating valve that opens immediately in response to the pressure drop caused by abrupt pump stoppage. The pre‑opened valve dissipates the returning high‑pressure wave to eliminate surge. It then closes smoothly, drip‑tight, as permitted by the relief feature to prevent closing surge. The valve also relieves excessive system pressure.

Product Identity

• Product code: 835-M
• Series: 800 Series
• Segment: Waterworks (pumping stations)

Features & Benefits

• Piston actuated – suitable for high‑pressure service
• Line pressure driven – independent operation
• Elegant simplicity
  • Cost‑effective
  • Simple to maintain
  • Minimal external accessories
• In‑line serviceable – easy maintenance
• Double‑chamber design
  • Moderated valve reaction
  • Controlled closing curve
• Flexible design – easy addition of options
• Semi‑straight flow – non‑turbulent flow path
• Stainless steel raised seat – cavitation resistant
• Obstacle‑free full bore – uncompromising reliability
• V‑Port throttling plug (optional) – stable at low flow

Typical Applications

• Pumping stations – surge control and pump protection

Technical Specifications

• Model: 835-M (800 Series)
• Type: Off‑line surge anticipating control valve, hydraulically operated, piston actuated
• Flow limiter: Mechanical flow stem (pre‑open feature)
• Actuation: Line pressure driven (independent operation)
• Primary function: Opens on pump‑stop pressure drop to dissipate returning high‑pressure wave; prevents closing surge; relieves excess system pressure
• Flow path: Semi‑straight, obstacle‑free full bore
• Seat: Stainless steel raised seat (cavitation resistant)
• Design: Double chamber for moderated reaction and closing curve
• Serviceability: In‑line serviceable for easy maintenance
• Optional features: V‑Port throttling plug for low‑flow stability; additional options available
• Typical sector: Waterworks (pumping stations, surge protection)
• Internal identifier: 30587