W Series Worm Gear Actuators: Self-Locking Safety Solutions for Rising Stem Valves

The W Series is a specialized line of worm gear actuators by Nippon Gear, designed for multi-turn applications. With its excellent self-locking characteristics, this series is the ideal choice for gate valves, sluice gates, and rising stem valves that require significant thrust for safe operation.

Key Highlights of the W Series

1. Intelligent Self-Locking Mechanism

This is the core advantage of the worm gear design. The mechanism completely prevents the valve stem from back-driving due to flow pressure or the weight of the valve gate. This ensures the valve remains securely in its desired position, enhancing absolute system safety.

2. Effortless Operation with “Hammer Blow”

Similar to Nippon Gear’s high-end lines, the W Series integrates the Hammer Blow effect. This feature allows operators to easily dislodge jammed valves or ensure a tight seal without needing excessive initial force.

3. Modular Design – Simplified Maintenance

• Two-Piece Drive Sleeve: The smart design allows technicians to quickly remove the stem nut from the actuator. Machining threads or replacing components is simpler than ever.

• High Durability: Featuring a fully sealed construction pre-lubricated with Extreme Pressure (EP) grease, the units are wear-resistant and ready for immediate deployment.

4. Flexible Upgrade Capability

• Electric Actuator Integration: The W Series can function as a secondary reduction gearbox when coupled with electric actuators such as the SMB, JMB, or L120 series to automate processes.

• Dual Shaft Option: Expands installation possibilities for handwheels or motors in multiple positions, perfect for restricted spaces.

Practical Applications

The W Series is a trusted solution in the following sectors:

• Water & Wastewater Systems: Operating large gate valves and flood control sluice gates.

• Heavy Industry: Rising stem valves in steel mills and chemical plants.

• Irrigation Infrastructure: Flow control in high-pressure diversion channels.

W Series Technical Specifications

The W Series consists of 5 unit sizes, optimized for various load ranges:

Additional Options

• Position Indicators & Limit Switches: Supports on-site valve status monitoring or provides feedback signals to a remote control center.

• Variable Efficiency: Depending on the gear ratio, efficiency ranges from 0.20 to 0.55, specifically optimized for reliable self-locking performance.