Model 835-M

Model 835-M - High Pressure, Surge Anticipating Control Valve

WW_835-M_Big_Galleryhe Model 835-M High Pressure, Surge Anticipating Valve is an off-line, hydraulically operated, piston actuated valve. The valve, sensing line pressure, opens in response to the pressure drop associated with abrupt pump stoppage. The pre-opened valve dissipates the returning high pressure wave, eliminating the surge. The Model 835-M smoothly closes drip tight as quickly as the relief feature allows, while preventing closing surge. The valve also relieves excessive system pressure.


Features and Benefits

  • Robust structure, piston actuated – High pressure service
  • Replaces surge air vessels
    • Relieves surge, fail-safe open
    • Minimal maintenance
    • Economy of space
    • Lower investment & maintenance costs
    • Especially economic for higher pressure ratings
  • Line pressure driven
    • Independent operation
    • No motor required
    • Long term drip tight sealing
    • Adjustable hydraulic actuation
  • Double chamber – Moderated valve closing (no surges)
  • In-line serviceable – Easy maintenance
  • Obstacle free, full bore – Uncompromising reliability
  • Balanced seal disk – High flow capacity


Typical Application

In this system, a pump battery supplies the main line through a manifold. The Model 835-M:

  • Eliminates surge on power failure
  • Provides surge free switching between “on-duty” pumps
  • Closes smoothly according to pilot setting