Non-Rising Stem Cuniform Underground Gate Valve: Complete Guide

Introduction

The non-rising stem cuniform underground gate valve is a widely used industrial valve designed for underground pipeline applications where overhead space is limited. With a cuniform wedge gate structure and non-rising stem design, it ensures reliable shut-off, long service life, and efficient operation even in demanding environments.

This article provides a comprehensive overview of its warranty terms, maintenance methods, certification standards, and available specifications, making it a valuable reference for engineers, procurement teams, and end-users.

Key Features of Non-Rising Stem Cuniform Underground Gate Valve

• Compact non-rising stem design, suitable for confined underground spaces.

• Cuniform wedge ensures tight sealing under high pressure.

• Robust body with anti-corrosion coating for extended durability.

• Widely applied in municipal water supply, wastewater management, oil & gas, and industrial networks.

• Compliance with international safety and environmental standards.

Warranty Terms

Manufacturers of non-rising stem cuniform underground gate valves usually provide clear warranty coverage to protect end-users. Below are typical warranty conditions:

Standard Warranty Coverage

• Warranty period: 12–24 months from delivery or 18 months from installation, whichever comes first.

• Scope of coverage: Manufacturing defects, material faults, or malfunction under normal operating conditions.

• Exclusions:

• Damage due to improper installation or misuse.

• Corrosion caused by exposure to non-specified fluids.

• Unauthorized modifications or repairs.

Extended Warranty Options

Some suppliers offer extended warranties with service agreements, including:

• Regular inspection visits.

• Priority access to spare parts.

• On-site technical support for urgent issues.

Maintenance Methods

Proper maintenance ensures long-lasting performance of underground gate valves. The following practices are recommended:

Routine Inspection Checklist

Lubrication Guidelines

• Apply anti-corrosive lubricant on the stem and operating nut.

• Ensure lubrication channels are free from dust and debris.

• Use manufacturer-approved grease to avoid chemical incompatibility.

Long-Term Maintenance Tips

• Operate the valve at least once every 3 months to prevent jamming.

• Install valve boxes or extension rods for underground accessibility.

• Record all inspection and maintenance activities for future reference.

Certification Standards

To meet global industry requirements, the non-rising stem cuniform underground gate valve complies with multiple standards:

Common Certifications

• ISO 9001 – Quality management system compliance.

• EN 1074 / EN 1171 – European standards for water supply valves.

• API 600 / API 6D – American standards for industrial valves.

• WRAS / NSF – Drinking water safety certification.

• CE Marking – Compliance with EU directives.

Environmental and Safety Standards

• ISO 14001 – Environmental management compliance.

• RoHS Directive – Restriction of hazardous substances in materials.

• Energy-efficient design ensuring minimal torque and lower energy use.

Specifications and Models

The non-rising stem cuniform underground gate valve is available in multiple models and sizes to meet different project needs.

General Technical Specifications

Usage Instructions

Correct operation is essential for maximizing the performance of underground valves.

1. Installation Preparation

• Ensure pipe ends are clean and aligned.

• Confirm pressure rating compatibility.

• Apply protective coating before burying.

2. Operation Guidelines

• Rotate handwheel or actuator smoothly; avoid sudden force.

• Ensure valve is fully closed/opened as required.

• Do not exceed rated torque during operation.

3. Storage Conditions

• Store in a dry, ventilated area before installation.

• Keep valve ends sealed with protective covers.

• Avoid direct exposure to sunlight and corrosive chemicals.

After-Sales and Technical Support

Reliable after-sales service is crucial for customer satisfaction. Leading manufacturers provide:

• Technical documentation (manuals, CAD drawings, test reports).

• On-site installation support for large projects.

• 24/7 technical hotline for troubleshooting.

• Training programs for maintenance teams.

Conclusion

The non-rising stem cuniform underground gate valve is a highly reliable choice for underground pipelines where space is limited. With strong sealing performance, compliance with international certifications, and options for customized specifications, it serves as an ideal solution for municipal water supply, wastewater treatment, oil and gas, and industrial networks.

By following proper maintenance methods, adhering to certification standards, and leveraging manufacturer after-sales support, operators can ensure long-term reliability and cost-effective performance of their valve systems.