Press tongs KVT: types, characteristics and choice of tools

Professional installation of electrical wiring is impossible without high-quality tools that can ensure reliable connection of conductors. Among the many brands on the market, the products of the Russian company KVT (Cable Tools and Technologies) deservedly occupy a leading position due to the combination of affordable prices and high reliability. The main working tools of an electrician are press pliers, which allow you to create permanent connections using the crimping method, guaranteeing minimal contact resistance.

In this article we will analyze in detail what types of KVT press jaws exist, what are their design features and how to choose the right tool for specific tasks. Whether you're working with thin, stranded wires in a panel room or installing large-gauge power lines, understanding tool classification is critical to the safety and longevity of your electrical network.

The choice between mechanical and hydraulic models often becomes a dilemma for beginners. Mechanical pliers are compact and require no maintenance, while hydraulic models allow for tremendous force with minimal operator effort. Let's look at the main tool categories so you can make an informed decision.

Classification of mechanical press jaws KVT

Mechanical pliers are the most common type of hand tool for crimping ferrules and sleeves. In the KVT assortment they are represented by the PKV and PKVm series, which differ in the design of the jaws and the type of matrices. Mechanical crimping Suitable for working with sections up to 50 mm², although some models can also work with larger diameters, provided that the appropriate inserts are used.

One of the key features of the PKVM series models is the presence of rotary matrices. This solution allows you to quickly change the profile type (for example, from sleeve to tip) or size by simply turning the tool head to the desired sector. This design significantly speeds up the installation process in cramped conditions where it is not possible to change removable heads.

For working with non-standard or rarely used sections, models with removable matrices are preferable. In this case press pliers KVT are equipped with a set of inserts that can be quickly replaced depending on the diameter of the conductor being crimped. This makes the tool a universal solution for electrical installation crews working on a variety of sites.

• ⚡ PKVM series - compact pliers with rotating dies for quick switching between sections.
• ⚡ PKV series is a classic tool with removable dies for working with a wide range of sizes.
• ⚡ Models with a ratcheting mechanism - prevent the jaws from unclenching until the full crimping cycle is completed.
• ⚡ Insulated handles - provide protection and comfort during long-term work in electrical installations.

⚠️ Attention: When using mechanical pliers with a large cross-section (from 35 mm²), applying force may be difficult. Do not use extended arms ("tubes") to increase force, as this may cause the jaws to become deformed or the joint to break.

Hydraulic tools: power and efficiency

When it comes to power lines and cables of large cross-section, the mechanical force of the hands becomes insufficient. This is where they take the stage hydraulic press jaws KVT, PGR and PG series. The principle of their operation is based on the transmission of force through hydraulic fluid, which allows the development of pressure of several tons with minimal effort on the handle.

The hydraulic drive ensures uniform compression on all sides, which is especially important for the formation of high-quality connections in stranded conductors. The KVT tool is equipped with automatic pressure release: after the matrices are closed, the valve opens and the rod returns to its original position. This eliminates the risk of pinching and damage to the metal structure of the conductor.

There are models with open and closed head. Open head (C-shaped) allows you to enter the cable from the side, which is convenient when working with already fixed lines or in hard-to-reach places in switchboards. The closed head provides a more rigid fixation of the die and is recommended for precise positioning during mass crimping.

It is important to note that hydraulic pliers require periodic maintenance. It is necessary to monitor the oil level and the absence of leaks. Despite their large mass compared to mechanical analogues, their performance when working with large sections is disproportionately higher.

Cordless press jaws: technologies of the future

Modern electrical installation increasingly requires the mobility and speed that only autonomous tools can provide. Rechargeable press pliers KVT APK series represent the pinnacle of engineering in this area. They relieve the installer of physical exertion by performing a full crimping cycle with the press of one button.

The key feature of such models is the intelligent control system. The microprocessor controls the pressure in the hydraulic system and automatically stops the process when the required compression force is reached. This completely eliminates the human factor and errors associated with under-pressing or pinching the contact.

Most models are equipped with LED work area lighting, which is extremely useful when working in poorly lit niches or basements. Interchangeable heads allow you to use one drive mechanism to work with different types of dies, making the tool a universal fighter on site.

• 🔋 High speed of operation - up to 60-80 tests on one battery charge.
• 🔋 Ergonomic design - reduces the load on the operator's hand and wrist.
• 🔋 Charge indicator - allows you to plan work without unexpected stops.
• 🔋 Possibility of manual emergency opening in case of low battery.

Correspondence table of sections and matrices of KVT

Correct selection of the matrix is the key to a high-quality connection. Using the wrong profile may result in the contact heating up under load or the conductor jumping out of the sleeve. Below is background information on the main standard sizes of the KVT tool.

When choosing a matrix, always pay attention to the markings on the working part. The numbers indicate the compatible wire gauge. For color identification, a system is often used where the color of the matrix matches the insulation color of the standard tip.

⚠️ Attention: Never use dies from other manufacturers with KVT pliers without first checking the compatibility of the mounting dimensions. This can lead to jamming of the tool or poor crimping quality.

Features of crimping various types of tips

The crimping technology depends not only on the tool, but also on the type of tip used. Different approaches are used for tinned copper lugs (TCL) and aluminum lugs (TA). Aluminum is softer and prone to oxidation, so it requires careful cleaning and the use of quartz-vaseline paste before crimping.

When working with bolt tips, it is important to maintain the orientation of the shank in the die. Crimping is usually done in several steps, starting from the bolt hole and moving towards the end of the shank. The number of crimps is regulated by technical specifications and depends on the length of the contact blade.

For stranded conductors, it is critical to use sleeves and ferrules that meet the flexibility rating of the wire. Press pliers must provide such compression that all the wires are pressed tightly against each other, but not cut. Violation of the core structure reduces the current-carrying capacity and mechanical strength of the connection.

Tool safety and maintenance

Any tool, even one as reliable as KVT products, requires compliance with operating rules. Regularly checking the condition of the hinge joints and the absence of play is a mandatory procedure before starting work. Mechanical damage to the jaws is unacceptable, since they directly affect the geometry of the resulting contact.

For hydraulic tools, it is important to periodically check the integrity of the seals and the level of the working fluid. Abrasive particles or dirt entering the hydraulic system can damage the mechanism. The instrument should be stored in its original case, protected from moisture and direct sunlight.

The use of personal protective equipment when working with power tools and under voltage is mandatory. Although the pliers themselves often have dielectric coating on the handles, you cannot rely on them alone when working in active electrical installations. Always make sure there is no voltage before starting installation.

⚠️ Attention: If you notice that deep cracks or metal tears have appeared on the surface of the crimped tip, it means that the compression force was excessive or the matrix was selected incorrectly. This contact needs to be redone.

Frequently asked questions (FAQ)