Water back-pressure regulator 753-80

for potable waterdiaphragmplug

Product overview
Hydraulically operated level control and pressure sustaining valve that controls reservoir filling and reservoir level. During filling the valve sustains a minimum upstream pressure regardless of fluctuating flow or reservoir level. The valve shuts off at a preset high reservoir level and fully opens in response to an approximately 1 m (3 ft) level drop, as sensed by the 3‑Way altitude pilot mounted on the main valve.

Series / Model
700 Sigma Series / Model 753-80

Features & benefits

• Double‑chamber actuator for moderated valve reaction and protected diaphragm
• Altitude 3‑Way pilot for level sensing and repeatable open/close response
• Designed for excellent anti‑cavitation performance and wide flow range
• Drip‑tight sealing and high stability/accuracy
• Obstacle‑free flow path; V‑Port throttling plug available for very stable low‑flow control
• In‑line serviceable design for simplified maintenance
• Certified to drinking‑water and functional standards: EN‑1074, NSF‑ANSI 61/372, WRAS, AS 5081 (and other relevant standards)

Typical applications

• Municipal systems — level control for water towers and elevated reservoirs
• Bi‑level control for water refreshment and reservoir management
• Water delivery systems — prioritizing upstream supply over reservoir filling
• Potable water networks and fire protection systems

Operation notes
The valve is equipped with a 3‑Way altitude pilot mounted on the main valve to sense reservoir level changes; it fully opens after approximately 1 m (3 ft) level drop and shuts off at preset high level. The valve also functions as a pressure sustaining device, maintaining minimum upstream pressure during filling despite flow or level fluctuations.

Technical specifications

• Model: 753-80 (700 Sigma Series)
• Function: Level control & pressure sustaining with 3‑Way altitude pilot
• Actuator: Double‑chamber
• Flow path: Obstacle‑free
• Optional trim: V‑Port throttling plug for stable low‑flow control
• Serviceability: In‑line serviceable
• Anti‑cavitation: Engineered for cavitation resistance
• Operational range: Wide flow range; optional very low pressure operation
• Sealing: Drip‑tight
• Standards: EN‑1074, NSF‑ANSI 61/372, WRAS, AS 5081