Electric Actuator Operated Ductile Iron NRS Gate Valves

Technical Overview & Premium Engineering

In modern automated fluid networks, precision control and heavy-duty durability are essential for infrastructure longevity. The electric actuator operated ductile iron NRS gate valves stand as an advanced solution for municipal water supply, urban drainage, and wastewater treatment systems. Engineered to eliminate manual operational bottlenecks and environmental degradation, this valve series integrates automated actuation with robust structural design.

Electric actuator operated ductile iron NRS gate valves, RF flanged ends, FBE coated.

Conforming strictly to global standards including EN 1074-1, EN 1074-2, BS 5163, DIN 3352, EN 558, and EN 1171, the resilient-seated Non-Rising Stem (NRS) gate valve features an uncompromised fastening design. All critical interfaces—including the internal socket head cap screws sealing the bonnet to the body, and the external hex bolts securing the stem connection—are fabricated from premium A2/A4 stainless steel. This non-corrosive hardware matrix prevents bolt-shearing and body rust-expansion, guaranteeing safe, long-term deployment in perpetually damp chambers or direct-burial environments.

Advanced Actuator Features & Intelligent Functions

The valve is driven by a high-performance quarter-turn electric actuator designed for high torque density, operational safety, and seamless human-computer interaction.

Design Features

• Patented Planetary Gear Mechanism: Utilizes an innovative, patented planetary solar-gear design that enables automatic manual/electric switching without a mechanical clutch. It includes a handwheel or planetary gear mechanism for reliable emergency manual override on heavy-duty models.
• Eco-Friendly & Renewable Energy Ready: Driven by advanced DC motor technology, the system can seamlessly run on alternative power sources like solar, thermal, or wind power generation equipment.
• Non-Intrusive Control & Modern UI: Employs a non-invasive through-shaft magnetic switch acting on internal Hall-effect sensors to preserve housing integrity. It comes with a newly designed UI operation interface and optional portable infrared or intrinsically safe explosion-proof remote controls.
• Flexible Adaptability: Equipped with interchangeable spline sleeves and universal connecting flanges (ISO 5211) for fast field retrofits. It can also pair with chainwheels/sprockets for easier manual operation of high-altitude valve setups.
• RoHS-Compliant 3D Visual Window: Features a high-strength, UV-resistant, and RoHS-compliant 3D plastic window for a comprehensive, multi-angle view of real-time valve travel.

Functional Performance & Protection

• Smart Over-Torque Protection: Automatically trips and stops operation if the valve gets stuck, preventing structural damage to the valve stem and actuator internals.
• Real-Time Diagnostics: Loaded with multi-sensor arrays that monitor control signals, fault alarms, and operating states. Advanced self-diagnostics pinpoint exact fault locations to streamline troubleshooting.
• Secure Password Authorization: Restricts configuration access to authorized operators, preventing accidental field mis-operations and settings failures.
• Thermal Overload Protection: Features a standard Class F insulated motor (Class H optional) with embedded temperature control switches within the windings to prevent motor burnout.
• Anti-Condensation Space Heater: Includes an internal moisture-proof heater to remove condensation from sensitive electrical components in highly humid environments.
• Phase Sequence Detection & Correction: Automatically detects and corrects the electrical phase sequence upon wiring connection (for three-phase power supply), avoiding damage from incorrect phases or phase loss.

Key Actuator Specifications

Engineered for precision: Metalsin provides premium electric actuators built for your specific application requirements.

The following structured data provides a concise reference for the performance limits and mechanical parameters of the EOM/EFM actuator series:

• Torque Range: 10 – 20,000 N·m (Rated operating torque is 0.75 × maximum torque).
• Switching Time: 11 – 155 seconds at 50Hz (5/6 times faster at 60Hz).
• Enclosure Protection: Standard IP67; optional IP68 waterproof rating (submersible up to 7 meters for 72 hours).
• Ambient Temperature: Standard -25°C to 70°C (Optional low/high temperature configurations: -40°C to 60°C).
• Flange Connection: Fully compliant with ISO 5211 standards.
• Working System (Duty Cycle): * On/Off Type: S2-15 min (Max 600 starts per hour; S2-8 min for 3A/7A/8A models). Modulating Type: S4-50% (Max 600 triggers per hour; S4-15% for 3A/7A/8A models).
• Control Signals: Supports On/Off control (AC/DC 24V or AC 110/220V) and Modulating control (4-20mA, 0-10V, 2-10V input/output; adjustable dead zone from 0.5% to 100%).