MANUAL OF SLUICE VALVES

1. Introduction

Scope

This manual provides guidelines for the installation, operation, maintenance, inspection, warranty coverage, and service procedures for Sluice Valves manufactured and supplied by GM Dalui & Sons.

Applications

Sluice Valves are primarily designed for isolation purposes and are widely used in:

• Water Supply Systems
• Municipal Water Distribution Networks
• Irrigation Projects
• Water Treatment Plants
• Sewage Treatment Plants
• Pumping Stations
• Industrial Pipelines
• Fire Protection Networks

These valves are suitable for full open or full close service and should not generally be used for throttling applications.

2. Installation Guidelines

Pre-Installation Checks

Before installation:

• Verify valve size, pressure class, and material specifications.
• Inspect valve for transportation damage.
• Ensure valve bore is clean and free from foreign particles.
• Remove protective covers from flange faces.
• Confirm flow direction requirements, if applicable.

Pipeline Preparation

• Flush pipeline before installation.
• Remove welding slag, stones, rust, and debris.
• Ensure pipe alignment is accurate.
• Avoid excessive pipe stress on valve body.

Valve Orientation

Recommended installation positions:

• Vertical spindle position preferred.
• Horizontal spindle position acceptable.
• Ensure sufficient clearance for handwheel operation and maintenance access.

Flange Bolting

• Use approved gaskets.
• Tighten bolts in a diagonal sequence.
• Apply uniform torque.
• Avoid over-tightening.

Installation Precautions

• Valve should be partially open during installation.
• Never lift valve using handwheel, gearbox, or actuator.
• Use proper lifting equipment for large diameter valves.

3. Operation Instructions

Opening Procedure

1. Rotate handwheel counterclockwise.
2. Open valve gradually.
3. Continue operation until full open position is reached.
4. Avoid excessive force once fully opened.

Closing Procedure

1. Rotate handwheel clockwise.
2. Close valve gradually.
3. Ensure wedge is fully seated.
4. Do not use additional tools or extension bars.

Operating Precautions

• Operate valve slowly to prevent hydraulic shock.
• Do not use valve for flow regulation.
• Avoid excessive torque.
• Operate within specified pressure and temperature limits.

4. Maintenance Schedule

Monthly Inspection

• Check for external leakage.
• Inspect gland packing condition.
• Verify smooth handwheel operation.
• Check fasteners and mounting hardware.

Quarterly Inspection

• Inspect stem lubrication.
• Check gland bolts and packing adjustment.
• Examine gearbox operation where applicable.
• Verify coating condition.

Annual Inspection

• Inspect wedge and seating surfaces.
• Examine stem threads.
• Replace worn packing if necessary.
• Inspect seals and gaskets.
• Perform pressure and leakage testing.

Recommended Spare Parts

• Stem Packing
• O-Rings
• Gland Components
• Fasteners
• Gearbox Parts
• Stem Nut
• Wedge Guide Components

5. Warranty Coverage

Warranty Exclusions

Warranty does not cover:

• Improper installation.
• Operation beyond rated conditions.
• Use for throttling service.
• Mechanical damage during handling.
• Corrosion due to unsuitable media.
• Unauthorized repairs or modifications.
• Normal wear and tear.

6. Expected Service Life

Factors Affecting Service Life

• Operating Pressure
• Water Quality
• Frequency of Operation
• Maintenance Practices
• Environmental Conditions
• Corrosion Exposure

Proper preventive maintenance can significantly extend valve service life.

7. Customer Responsibilities

The customer shall:

• Ensure proper installation.
• Maintain inspection and maintenance records.
• Operate valve within rated limits.
• Conduct periodic maintenance.
• Protect valve from external damage.
• Report defects promptly.
• Follow manufacturer recommendations.

Failure to comply may affect warranty eligibility.

8. Warranty Claim Procedure

Step 1 – Submit Claim

Provide:

• Purchase Order Number
• Invoice Copy
• Valve Serial Number
• Installation Date
• Photographs of Defect
• Description of Failure

Step 2 – Technical Review

GM Dalui & Sons will:

• Review submitted documents.
• Evaluate installation and operating conditions.
• Determine warranty applicability.

Step 3 – Inspection

Where necessary:

• Site inspection may be conducted.
• Valve may be requested for factory examination.

Step 4 – Resolution

Depending on findings:

• Repair
• Component Replacement
• Valve Replacement
• Technical Recommendation

will be provided in accordance with warranty terms.

Safety Precautions

• Depressurize pipeline before maintenance.
• Wear appropriate PPE during inspection and repair.
• Never dismantle valve under pressure.
• Follow plant safety procedures.
• Use approved lifting equipment for large valves.