Velvac Constant Torq Clamp User Manual

1. Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of the Velvac Constant Torq Clamp, Model 022420. This heavy-duty clamp is designed to provide a reliable and consistent clamping force in various applications, particularly where temperature fluctuations or hose compression set can lead to leaks.

2. Product Overview

The Velvac Constant Torq Clamp features a patented Belleville spring design that automatically adjusts its diameter to compensate for changes in hose size due to temperature variations or compression set. This innovative design helps eliminate "cold flow hose leaks" and ensures a secure connection over time.

Figure 2.1: Velvac Constant Torq Clamp (Model 022420). This image shows the clamp's robust construction, designed for consistent torque application.

Key Features:

• Constant-Torque® Design: Patented Belleville spring system ensures continuous clamping force.
• Leak Prevention: Automatically adjusts to prevent "cold flow hose leaks" caused by hose compression set or thermal expansion/contraction.
• Durable Construction: All stainless steel construction for corrosion resistance and longevity.
• Protective Liner: Extended inner liner covers worm gear slots, protecting against extrusion and damage to the hose.
• Wide Application: Suitable for bus, truck, and heavy-duty equipment air intake and coolant connections.
• Adjustable Range: Extended adjustment range reduces the need for multiple stocked parts.

3. Setup and Installation

Proper installation is crucial for the optimal performance and longevity of the Constant Torq Clamp. Follow these steps carefully:

1. Prepare the Connection: Ensure that the hose and fitting surfaces are clean, dry, and free from any debris or lubricants that could compromise the seal.
2. Position the Clamp: Slide the Constant Torq Clamp over the hose end before placing the hose onto the fitting. Position the clamp over the area where the hose will seat firmly on the fitting.
3. Tighten the Clamp: Using an appropriate tool (e.g., a screwdriver or nut driver), tighten the worm gear screw. Apply torque within the specified range of 30-70 in./lbs. (3.4-7.9 Nm). Do not overtighten, as this can damage the hose or the clamp.
4. Verify Security: After tightening, gently tug on the hose to ensure it is securely fastened and does not slip. The Belleville spring mechanism will ensure consistent pressure.

Important: Always refer to the equipment manufacturer's specifications for hose and clamp installation procedures if available.

4. Operating Principles

The Velvac Constant Torq Clamp operates on a self-adjusting principle. The integrated Belleville spring washers within the clamp's housing are pre-tensioned to maintain a consistent clamping force. When the hose material expands or contracts due to temperature changes, or when the hose experiences "cold flow" (permanent deformation under pressure), the Belleville springs automatically compensate by expanding or compressing, thereby maintaining the desired torque on the connection. This eliminates the need for re-tightening and significantly reduces the risk of leaks.

Typical Applications:

• Bus and truck coolant systems
• Heavy-duty equipment air intake systems
• Other applications requiring reliable, leak-free hose connections under varying conditions.

Figure 4.1 & 4.2: Examples of heavy-duty vehicles where Velvac Constant Torq Clamps are commonly used for critical connections.

5. Maintenance

The Velvac Constant Torq Clamp is designed for minimal maintenance due to its robust, all-stainless steel construction and self-adjusting mechanism. However, periodic inspection is recommended to ensure continued optimal performance.

Inspection Schedule:

• Inspect clamps during routine vehicle or equipment maintenance checks.
• Check for any visible signs of damage, corrosion, or deformation.
• Ensure the clamp is still securely seated on the hose and fitting.

Cleaning:

If cleaning is necessary, wipe the clamp with a clean cloth. Avoid using harsh chemicals or abrasive materials that could damage the stainless steel finish.

Replacement:

If a clamp shows signs of significant damage, excessive corrosion, or if the connection appears loose despite proper installation, replace the clamp immediately with a new Velvac Constant Torq Clamp of the correct size and model.

6. Troubleshooting

While the Constant Torq Clamp is designed for reliability, issues can occasionally arise. Here are some common problems and their potential solutions:

If troubleshooting steps do not resolve the issue, contact Velvac customer support or a qualified technician.

7. Specifications

8. Warranty and Support

For information regarding the warranty of your Velvac Constant Torq Clamp, please refer to the official Velvac website or contact Velvac customer service directly. Velvac is committed to providing high-quality products and support.

Velvac Customer Support:

• Visit the official Velvac website for contact information and FAQs.
• Refer to your purchase documentation for specific warranty terms.

Figure 8.1: Velvac Company Logo. For support and warranty details, please visit the official Velvac website.