Diaphragm valve 745

hydraulically-operatedpiloton/off

Product Overview
Hydraulically actuated pump control valve (Model 745, 700 Sigma Series) that integrates active-check valve logic. Installed as a branch from the main line and synchronized with the pump's electric control, it opens and closes during pump start/stop sequences to prevent pressure surges and to block startup debris such as sand and pebbles from entering the distribution network.

Features & Benefits

• Double-chamber hydraulic actuator
  • Moderated valve response for controlled opening/closing
  • Protected diaphragm to increase reliability
  • Optional operation at very low inlet pressure
• Active-check function synchronized with electric pump control
• Excellent anti-cavitation characteristics and wide flow range
• Obstacle-free flow path and drip-tight sealing
• Optional V-Port throttling plug
  • Stable performance at low flows
• In-line serviceable actuator
  • Fast access for maintenance without removing the valve body
• Certified to drinking water and functional standards
  • EN-1074, NSF-ANSI 61-372, WRAS, AS 5081 and others

Typical Applications

• Deep-well pumps and pumping stations — control of pump start-up and shut-down and surge protection

How it works
The valve is a hydraulically actuated branch unit synchronized with the pump’s electric control. It opens during pump start and closes during pump stop to absorb transients and prevent pipeline surges. The double-chamber actuator provides moderated reaction and a protected diaphragm, reducing the risk of damage from debris and cavitation and extending service life.

Technical specifications

• Model: 745
• Series: 700 Sigma
• Product type: Booster / Pump Control Valve (Active Check Valve)
• Operation: Hydraulically operated, synchronized with electric pump control
• Design: Double-chamber actuator; obstacle-free flow path; optional V-Port throttling plug
• Maintenance: In-line serviceable actuator for easy maintenance
• Performance: Wide flow range, excellent anti-cavitation resistance, high stability and accuracy, drip-tight sealing
• Standards & approvals: EN-1074, NSF-ANSI 61-372, WRAS, AS 5081 (and other drinking water/functional standards)
• Typical application: Pumping stations / deep-well pump start-up and shut-down surge protection