PRODUCT INFORMATION

792-U – Burst Control and Pressure Reducing Valve

The Model 792-U Burst Control and Pressure Reducing Valve is a hydraulically operated, diaphragm actuated control valve with two independent functions.

When flow is below setting, it reduces higher upstream pressure to lower pre-set downstream pressure, regardless of varying demand or upstream pressure. Upon sensing flow in excess of setting, it shuts off drip tight and locks until it is manually reset.

Excessive Flow

• "Older" burst susceptible networks
• Vulnerable network infrastructure facilities
• Networks at risk of mechanical damage
• Flow and leakage reduction
• System maintenance savings

FEATURES & BENEFITS

• Line pressure driven - Independent operation
• Hydraulic flow sensor (upstream installation)
  • No moving parts
  • No electronic components
  • No need for flow straighten
• Sensitive hydraulic pilot - Tight setting window
• In line serviceable - Easy maintenance
  • Moderated valve reaction
  • Protected diaphragm
• "Y" or angle, wide body - Minimized pressure loss
• Obstacle free, full bore - Uncompromising reliability
• Stainless Steel raised seat - Cavitation damage resistant
• Semi-straight flow - Non - turbulent flow
• V-Port Throttling Plug - Low flow stability

Major Additional Features

• Solenoid control - 792 - 55 - U
• Electric override - 792 - 59 - U
• Downstream over-pressure guard - 792 - 48 -U
• Electronic multi-level setting, Type 4T - 792 - 4T - U

TECHNICAL DATA

The Model 792-U is a pilot controlled valve equipped with an assembly, a Hydraulic Relay Valve (HRV) and two adjustable 2-way pilots. The needle valve continuously allows flw from the valve inlet to the upper control chamber. The pressure reducing pilot senses downstream pressure. Should this pressure rise above pilot setting, the pilot throttles and causes the pressure in the upper control chamber to accumulate. This causes the main valve to throttle closed decreasing downstream pressure to pilot setting.

The differential Pressure sustaining pilot senses the differential pressure across the orifice plate. Should the differential pressure rise above pilot setting the pilot opens closing the HRV. The causing the main valve to begin an irreversible "close & lock" process. Opening and resetting the main valve requires manual intervention by means of the manual reset valve.

LITERATURE