Hydraulically-operated valve 753-66

floatlevel controlpressure sustaining

Product overview
Hydraulically operated level control and pressure-sustaining valve that controls reservoir filling and level. During filling the valve sustains a minimum upstream pressure regardless of fluctuating flow or reservoir level. Reservoir filling is actuated by a hydraulically controlled non-modulating bi-level vertical float that opens at a preset low level and shuts off drip-tight at a preset high level.

Features & Benefits

• Excellent anti-cavitation properties
• Wide flow range
• High stability and accuracy
• Drip-tight sealing
• Flexible design enabling easy addition of features
• Obstacle-free flow path
• Optional V-Port throttling plug for very stable low-flow control
• High-quality materials suitable for potable water
• In-line serviceable for easy maintenance
• Certified to functional and drinking water standards (EN-1074, NSF/ANSI 61-372, WRAS, AS 5081)

Double chamber design

• Moderated valve reaction
• Protected diaphragm
• Optional operation at very low pressure
• Moderated closing curve

Typical applications

• Level control for water reservoirs
• Bi-level control for water renewal/refreshment
• Water delivery systems — prioritizing upstream over downstream demand
• Acts as a safety valve in tank filling systems
• Potable water, fire protection and grey water systems

How it operates
The valve is hydraulically actuated and coordinated with a bi-level vertical float pilot. On detecting a preset low reservoir level the float-controlled pilot opens to allow filling; when the preset high level is reached the float pilot shuts the valve drip-tight. While filling, the valve sustains a minimum upstream pressure independent of flow fluctuations or reservoir level changes.

Characteristics / technical specifications

• Product code: 753-66
• Model / commercial denomination: 753-66
• Series: 700 Sigma Series
• Type: Level control & pressure-sustaining valve
• Actuation: Hydraulically operated
• Float: Non-modulating bi-level vertical float
• Operation: Sustains minimum upstream pressure during filling; opens at preset low level, closes drip-tight at preset high level
• Design: Double-chamber actuator; in-line serviceable
• Optional: V-Port throttling plug for very stable low-flow control
• Materials: High-quality materials suitable for potable water and heavy-duty applications
• Certifications: EN-1074; NSF/ANSI 61-372; WRAS; AS 5081 (and other drinking water & functional standards)
• Typical uses: Reservoirs, potable water distribution, fire protection systems, grey water systems