Inflatable watercraft often involve risks, and one of the most common problems is the loss of leakage of cylinders. flyboat It slowly poisons the air, and finding the leak site is a long process, and if you find that the air is coming out of the valve and the tissue, or the mechanism itself is jammed, then the only way out is to replace it, and that's not a reason to take the boat to the service center, because you can do it yourself at home.
Timely replacement valve-system It allows you to extend the life of your vessel and avoid more serious damage, such as tearing the seam under pressure or detaching tissue. The repair process requires care, special tools and, of course, a new, serviceable valve that is suitable in size and type. It is important to understand that the quality of this work directly affects the safety of being on the water, so rush is not allowed here.
In this article, we will discuss in detail all the steps of dismantling an old element and installing a new one, paying special attention to surface preparation and selecting an adhesive compound. You will learn how to properly warm up the balloon so that the adhesive is polymerized, and what mistakes beginners most often make. A competent approach will allow you to forget about the problem of a descending balloon and enjoy fishing or cruising again.
Diagnostics of malfunction and selection of a new valve
Before you start to actively repair, you need to make sure that the problem lies in the valve, and not in the microcrack of the body or the damaged seam. To do this, inflate the balloon to working pressure and abundantly lubricate the suspicious area with soap solution. leakageIf the bubbles are in a circle of the base, then the leakage of the sticker is broken, and replacement is inevitable.
The next critical step is to find the right replacement component, and there are many modifications on the market, and they're not always interchangeable. brig, Nisa universal leer An error in choosing the diameter of the landing hole or the height of the valve will result in the new element simply not standing in place or will interfere with the installation of the inflated bottom and seats.
⚠️ Warning: Never try to stick a smaller valve with more glue to fill the voids, guaranteed to cause a tear under pressure and could cause a serious water accident.
When buying, be sure to measure the diameter of the hole in your boat with a rod. Standard dimensions vary, but most often there are values of 38, 40 or 42 mm. Also pay attention to the design of the "skirt" (base) that will fit the fabric of the cylinder. Some models have a corrugated surface for better grip, others are smooth. For repairs, it is better to choose valves with a wide and flat skirt, providing maximum contact area with the cylinder. PVC material.
Required tools and materials for repair
The quality of the repairs is 90% dependent on the correct preparation and the availability of suitable tools. You should not try to replace the valve using household glue like "Moment" or superglue, because they do not have the necessary elasticity and adhesion to polyvinyl chloride. polyurethaneThese compounds, after drying, form a strong, flexible compound that withstands temperature changes and tissue deformation.
In addition to the glue, you'll need a toolbox that most craftsmen have in their garages. To heat the surface of the balloon and the valve itself, you need a building hair dryer. A household hair dryer won't be able to provide the 300-400 degree temperature needed to activate the chemical processes in the adhesive and soften the PVC. Also prepare a degreaser (acetone or special cleaner), sandpaper, marker, press load, and possibly a knife to trim the fabric.
☑️ Valve replacement tools
Special attention should be paid to the choice of glue. Texacol, Klejcol Two-part compounds require mixing the base and the hardener in a strictly defined proportion, usually specified in the instructions. Violation of proportions will either lead to the adhesive not drying or become brittle and brittle. Single-component adhesives are easier to use, but require more thorough drying and often higher temperatures to activate.
Surface preparation and dismantling of the old valve
The preparation process begins with the complete deflation of the balloon. If you plan to change the valve while it is still in the boat, make sure that moisture or debris does not get inside the cylinder. The dismantling of the old valve is the most time-consuming step, requiring patience. The main task is to separate the metal or plastic base from the fabric without damaging the cylinder itself. If the valve is held tight, you can carefully tamper with the edge of the cylinder with a thin knife or scalpel, trying to act parallel to the surface.
Once the main element is removed, the residue of the old glue and possibly the fragments of the skirt will remain on the fabric. They must be completely removed. To do this, use mechanical cleaning with a knife (acting very carefully to avoid making bullies) and subsequent skinning. The surface should become matte and rough. A smooth gloss of glue will not let the new composition catch. The size of the cleaned area should exceed the diameter of the new valve by at least 2-3 cm in a circle.
The final step is degreasing, and you can wipe the cleaned area with a cloth dipped in acetone or a special degreaser, which will remove dust, fat spots and chemical residues, and then you can't touch the prepared area with your hands, because the skin fat will reduce adhesion, and if there are folds or irregularities at the site, you can warm them up with a hair dryer and smooth them with a hard object, but without fanaticism, so as to avoid thinning the fabric.
What to do if the tissue under the valve is thinned?
If you notice that the cylinder fabric at the place of the sticker has become too thin or damaged, you need to put a patch. Cut a circle from the same PVC fabric with a diameter of a little more than the valve, shook it and glue it to the place of the old hole. After the patch is completely dry (at least 24 hours), you can start installing a new valve on a new surface.
In some cases, when an old valve sits dead and it is impossible to remove it without risking damage to the boat, professionals use the cutting method. A sharp knife cuts out a circle of tissue along with the valve, leaving a margin of 1-2 cm. Then a new insert (patch) is inserted into this place with a valve already installed and ready for operation. This is a more complex method that requires the skills of cutting and gluing the seams, but it guarantees the removal of the problem node entirely.
Gluing technology: applying glue and activation
The most important thing is to apply the adhesive composition. If you use a two-part glue, mix the base and the hardener in a clean container strictly according to the instructions. Mix the mixture carefully for 2-3 minutes so that the reaction goes evenly. You need to apply the glue on the back of the skirt of the new valve and on the prepared area of the balloon. The layer should be thin and uniform, without lashes and lumps. It is convenient to use a brush or a spatula.
After the first layer is applied, you have to let it dry. The drying time depends on the type of glue and the ambient temperature, usually 15-30 minutes. The glue has to stop being sticky to the touch, but not dry completely. Then you apply the second layer, which is also dried to the "stick" state. It is the two-layer application that provides maximum strength of the joint and fills all the micropores of the structure. PVC fabric.
The adhesive activates when you heat it up. Using a building hair dryer, warm the adhesive surfaces to 50-60 degrees (the hand must tolerate but feel the heat). Don't hold the hair dryer too close to melt the fabric or overheat the glue, making it liquid like water. Warming makes the surfaces sticky and ready to join. Immediately after warming up, while the glue is hot, you need to combine the valve with the hole and press hard.
When you combine the parts, immediately start rolling. As you move from the center to the edges, carefully roll the sticker or hard rubber roller to remove the air bubbles and ensure tight contact between the layers. The pressure should be strong and uniform. If there are air pockets under the skirt, the valve will sooner or later unstuck. Make sure that the valve is flat, without distortion.
Comparison of PVC boat valve types
Understanding the differences between valve types will help not only in the repair process, but also in the selection of a new boat. Other designs have their advantages and disadvantages in operation. Below is a table comparing the main specifications of popular types.
| Valve type | Construction | Pluses | Cons |
|---|---|---|---|
| Petal (Brig) | Rubber cuff inside | Simplicity, reliability, low price | Slower pumping, can poison when overloaded |
| Petal (Nisa) | Strengthened construction | High leakage | Requires a precise landing |
| Brass with a spring | Metal body, spring | Fast pumping/blowing, durability | High price, risk of spring corrosion |
| Plastic universal | Combined | Cheap, light. | Less reliable at high pressures |
When choosing a replacement, try to find an analogue of what was originally there, so as not to remodel the structure. However, if the standard valve was frankly weak, you can consider upgrading to a more reliable one. brass-modelprovided that its dimensions will allow it to be placed in an existing opening or require minimal modification.
Final drying and seal check
After the valve is installed, the repair is not complete. The glue must gain final strength, which takes time. The minimum period of primary polymerization is 12 hours, but to achieve maximum strength specifications, it is better to maintain the boat in a warm room (at a temperature of at least 20 ° C) for 24-48 hours. Pressure loading during this period is prohibited.
After a day, you can start testing. Pump the balloon to the working pressure (usually 0.2-0.25 atm, or until the fabric is elastic, but not stretched like a drum). Leave the boat in this state for a few hours, preferably for a day. Periodically check the pressure with a pressure gauge. If the pressure dropped slightly (due to temperature fluctuations), then the repair was successful. If the fall is noticeable, repeat the soap solution procedure around the valve.
⚠️ Warning: Don't test the leakage immediately after the valve is installed by pumping it "to the point." A sharp surge in pressure can move the glue that has not yet fully grown, and all work will go to waste. The pressure must be built up gradually.
If the test is successful, wipe the boat with a wet cloth to remove the glue residue, and you can safely head to the pond. A properly pasted valve lasts as long as the boat itself, without requiring additional maintenance, except periodic cleaning of sand and dirt.
The quality of gluing depends not so much on the brand of glue, as on the thoroughness of surface preparation (cleaning, degreasing) and compliance with the temperature regime during activation.
Frequent errors in self-replacement
When you look at the experience of repair, you can see a number of common mistakes that beginners make: the first and most common is not enough surface cleaning; the remaining layer of old glue or fat negates all efforts; the second mistake is saving on tools, in particular, using a household hair dryer instead of a building one, which does not give the desired activation temperature.
The third mistake is to break the drying technology, and many people try to speed up the process by heating the glue longer or harder than they need, which causes it to burn out, the glue to turn brown and lose its properties, and they often ignore the roller roller, relying only on the force of pressing the hands, which is not enough to remove the microbubbles.
⚠️ Attention: Do not repair in the cold or in high humidity. Optimal conditions - dry room with a temperature of +20... + 25 C. Cold slows down the glue reaction, and moisture can be preserved under the PVC layer, causing detachment in the future.
By avoiding these errors and following the instructions, you can restore the tightness of your boat. flyboat - it is your safety on the water, and quality valve repair is the key to quiet operation.
Can you replace the valve on the boat without removing it completely if it just poisons?
If the valve is intact but it's all around, you can try to resuscitate it without removing it, and you have to completely deflate the balloon, clean and degrease the valve and tissue joint thoroughly, then apply a new layer of glue into the gap using a thin spatula or needle, heat it up with a hairdryer and press it hard, but this method is less reliable than complete gluing, and serves as a temporary measure.
How to replace a special glue for PVC, if it is not on sale?
There is no complete replacement for specialized two-component polyurethane adhesives (Texacol type) and chloroprene adhesives are also suitable, but they are more temperature-sensitive. Conventional household adhesives (Moment, Superglue, Epoxy) are not categorically appropriate — they are not elastic and will detach at the first deformation of the balloon.
How long does the PVC boat glue dry?
The primary drying time of each layer is 15-30 minutes before the stick. Full polymerization (strength set) takes from 12 to 24 hours at a temperature of +20 ° C. At lower temperatures, the time increases. It is recommended to load the boat with water and pressure no earlier than 24 hours after gluing.
Do I need to hide the valve before the sticker?
Yes, it must. The factory surface of the valve (especially plastic or lacquered metal) is too smooth for a reliable grip, it must be treated with sandpaper (80-120 granularity) before the mattage and scratches appear, and then thoroughly degreased, which will increase the contact area and mechanical adhesion.