Type "A" Non-Rising Stem Resilient Seated Gate Valve

The Type "A" Non-Rising Stem Resilient Seated Gate Valve represents an advanced iteration of the standard non-rising stem design, engineered for improved durability, enhanced sealing performance, and reliable operation in medium-pressure water systems. Its compact construction allows installation in tight industrial spaces without sacrificing functionality.

Design and Operation

This valve features a ductile iron body with reinforced ribbing for structural strength. The non-rising stem rotates within a brass nut, ensuring minimal wear and protecting against corrosion. The resilient EPDM seat provides a tight seal, capable of handling intermittent flow, pressure fluctuations, and preventing water hammer effects. The Type "A" design includes optimized disc geometry for smoother operation and reduced torque during valve actuation.

Technical Specifications

• Standard Compliance: AWWA C509-87, ISO 9001 Certified Manufacturing
• Pressure Rating: Up to 200 psi (PN16)
• Temperature Range: 0°C to 80°C for potable water
• Materials: Ductile iron body, brass stem nut, EPDM resilient seat
• Sizes: 3" to 12" nominal pipe size (DN80-DN300)
• Connection Type: Flanged per EN 1092-2

Applications

This valve is ideal for municipal water supply networks, commercial buildings, and medium-duty industrial pipelines. Its resilient seat ensures reliable shut-off, while the compact non-rising stem design allows placement in areas with limited vertical space. The Type "A" valve can handle fluctuating pressures, making it suitable for pumping stations, booster systems, and water treatment facilities.

Installation Guidelines

Installation should follow manufacturer instructions carefully. Ensure pipelines are free from debris and properly aligned. Flange bolts should be tightened gradually in a criss-cross pattern to prevent uneven stress. Verify full opening and closing of the valve to avoid obstruction. For buried installations, proper valve box access should be provided for future maintenance.

Maintenance Recommendations

Regular inspection and maintenance are recommended to ensure long-term reliability. Lubricate the stem nut periodically to maintain smooth operation. Check the resilient EPDM seat for wear or deformation, replacing it as necessary. Cleaning and flushing the system helps prevent sediment buildup, extending valve service life. The Type "A" valve is designed for minimal downtime, allowing maintenance without removing the valve from the pipeline.

Industry Standards and Compliance

Manufactured according to AWWA C509-87 with ISO 9001 quality management, this valve meets international standards for resilient seated gate valves. The flanged connections comply with EN 1092-2, ensuring global compatibility and reliability for water system applications.

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