Piston valve Model 835-M

hydraulically-operatedregulatingfor water

The 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. •Robust structure, piston actuated – High pressure service •Replaces surge air vessels oRelieves surge, fail-safe open oMinimal maintenance oEconomy of space oLower investment & maintenance costs oEspecially economic for higher pressure ratings •Line pressure driven oIndependent operation oNo motor required oLong term drip tight sealing oAdjustable 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 PRODUCT APPLICATIONS 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