Diaphragm valve MN-740

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Overview
Hydraulically operated booster pump control valve that opens fully or shuts off on electric command. Designed to isolate the pump during startup and shutdown to prevent pipeline surge. The MN-740 (700 Sigma Series) is a diaphragm-actuated, oblique-pattern globe valve with a unitized double-chamber actuator and a hydrodynamic body for unobstructed high flow.

Key features

• Self-operated hydraulic principle with electric control signal—requires no continuous external power for basic operation.
• Available Normally Open (NO) or Normally Closed (NC) main valve configurations.
• Hydrodynamic, wide-globe body for higher flow coefficients (Kv/Cv) and reduced head loss.
• Integrated spring-loaded check feature replacing line-sized check valves and providing fail-safe mechanical closure.
• Drip-tight sealing and tamper-resistant design suitable for heavy-duty applications.
• Unitized double-chamber actuator: full powered open/close capability (option B) and removable as a single unit for simplified in-line maintenance.
• Flexible modular design for easy addition of optional features; obstacle-free flow path.

Applications

• Pump control and protection in water distribution and booster stations.
• Mining and industrial pumping systems requiring pump isolation during start/stop to prevent water hammer.
• Municipal waterworks and large-scale pumping installations.

Optional configurations / notes

• Standard configuration or with independent flow check (code "2S").
• Double-chamber actuator option (option "B") for full powered opening/closing.
• Additional pilots, accessories and material options available per technical documentation.

Technical specifications

• Model: MN-740
• Commercial series: 700 Sigma Series
• Product type: Booster Pump Control Valve / Quick Active Check Valve
• Actuation: Hydraulically operated, diaphragm-actuated; electric control for command signals
• Actuator: Unitized double-chamber actuator, removable as a single unit, in-line serviceable
• Valve body: Oblique-pattern globe, hydrodynamic design for unobstructed flow and high Cv/Kv
• Check feature: Spring-loaded, line-sized replacement check with fail-safe mechanical closure
• Sealing: Drip-tight
• Design attributes: Tamper-resistant, suitable for mining and heavy-duty waterworks
• Options: Independent flow check (2S), full powered opening/closing (option B), other modular options
• Typical application: Prevents pipeline surge by isolating pump during startup/shutdown