Inflatable vessel operation always involves risks of mechanical damage, and one of the most vulnerable parts of the design is the air valve. Even if you carefully circumvent sharp stones and branches on the shore, over time the material is not very good. polyvinyl chloride As the boat ages, the factory glue can dry up from temperature changes, and as a result, the boat begins to poison the air, making it impossible to fully fish or day on the water.
Replacing this element on your own is a very careful procedure, but it's very affordable at home without having to go to a dedicated service, and you don't have to have the skills of a professional shipbuilder, you just have to follow the technology and prepare the tools. valve will ensure the tightness of the balloon for many years and will allow you to forget about the constant pumping on the water.
In this article, we will discuss in detail the process of dismantling an old element, surface preparation and pasting a new node. You will learn why you can not use ordinary superglue, how to choose the right analog for your boat model and what mistakes are most often made by beginners. Tightness This is a top priority that directly affects your water safety.
Diagnosis and selection of a new valve
Before you start to act, you need to pinpoint the leak site and make sure that the problem lies in the valve. Often it is not the junction with the fabric that is poisoning, but the inner mechanism or the cap thread. To check, rinse the problem area with thick soap foam and leave the boat alone. The appearance of bubbles will indicate the exact place of depressurization.
If the air is coming out of the ground, it's inevitable that replacement is inevitable, but if the problem is in the spool, it might be enough to just clean it or replace the inside insert. It's important to choose the right type of new element, because manufacturers use different standards. Bravo, Bayard or specific models for boats frigate and hunter.
- 🔍 Visually inspect the valve petals for cracks or deformities that may have occurred during pumping.
- 🧪 Test with soap solution at the maximum pressure allowed for this model of boat.
- 📏 Measure the diameter of the landing hole so that the new element fits perfectly without gaps.
When buying a new consumable, pay attention to the quality of plastic and the availability of sealing rubber. Cheap Chinese counterparts can have injection molding defects that will manifest themselves after installation. It is better to purchase an original part or a certified counterpart from a proven manufacturer specializing in the field of injection molding. PVC accessories.
⚠️ Warning: Never try to seal a cracked valve body with a sealant or epoxy – this is a temporary measure that will lead to a complete loss of leakage at the most inopportune moment on the water.
Required tools and materials
The success of the operation depends on the quality of preparation, you will need not only the new valve itself, but also a specialized adhesive. Desmocoll or TexacolOften sold in hardener kits, household adhesives like Moment or cyanacrylate compounds are not acceptable because they do not provide an elastic seam.
In addition to glue, you need a degreasing agent. Acetone or a special PVC cleaner is necessary to remove fat film and dirt that interfere with adhesion. You also need a hair dryer for construction work, which is necessary to warm up the glue surfaces to the activation temperature of the glue. A normal household hair dryer here will not cope, because it does not give the desired flow temperature.
- 🖌️ A hard brush or roller for even application of adhesive composition.
- 🔥 Building hair dryer with the ability to adjust the temperature to 300 degrees.
- 📏 Spather or solid roller for rolling of glued surfaces.
Don't forget to prepare protective gloves and a respirator, as solvent and glue vapors can be toxic, work should be done in a well-ventilated room, a marker for marking and a sharp knife to carefully remove the old element if it does not unscrew.
☑️ Preparation for work
Dismantling of the old valve
The process of removing the old valve requires patience, especially if the boat has been in operation for a long time. The glue seam becomes very strong over time, and trying to tear the element by force will damage the tissue of the cylinder. First try to twist the valve counterclockwise using a special key that usually comes complete with a boat or pump.
If the valve fails or its petals are broken, you have to act mechanically, carefully cut the protruding part with scissors or a knife, leaving a minimum layer of plastic on the fabric, then, heating the residue with a hairdryer, gradually clean them with a spatula. harm PVC tissue cords.
Once the bulk of the plastic is removed, clean the sticker carefully, the surface should be flat, without bumps and residues of old glue, if the fabric is torn, it should be carefully slapped with fine sandpaper, but without fanaticism, so as not to thin the material. Cleanliness and roughness of the surface are key factors for success.
⚠️ Warning: When working with a knife and hair dryer, be extremely careful not to cut through the cylinder. Keep the blade parallel to the surface of the tissue.
Technology of applying glue and pasting
The most important step is to apply the adhesive compound, the polyurethane adhesive is applied in two layers, the first layer is rubbed into the fabric and on the valve back, after which the surfaces must dry to "stick" (usually 15-20 minutes), the second layer is applied on top of the first and also dried, but to a state where the adhesive stops sticking to the fingers, but retains stickiness.
The adhesive activates when you heat it up. Use a hair dryer to warm both of the adhesive surfaces to about 60 to 70 degrees. The plastic should become hot, but not melt. Immediately after heating, press the valve tightly against the hole and force the roller from the center to the edges, expelling the air bubbles.
Scheme of action:1. Degrease the surfaces.
2 Apply the first layer of glue, dry for 20 minutes.
3. Apply the second layer, dry until the stick.
Heat the hair dryer to 60-70°C.
5. Push hard and roll with a roller.
The time to fully polymerize the adhesive is 24 to 72 hours, depending on the temperature and humidity of the room. Do not try to pump the boat immediately after cooling the adhesive will cause the seam that has not yet gained strength to rupture. Patience. At this stage, the longevity of the repair is guaranteed.
What to do if the glue thickens in the jar?
If the two-part glue thickens or lumps appear, you can't use it -- there's zero adhesion. Always mix the components in the proportion specified by the manufacturer, and use the mixture for 2-3 hours. Store the components separately in tightly closed jars.
Checking the leakage after repair
After drying time has expired, you need to check the quality of the work done. Pump the cylinder to working pressure and leave the boat for a few hours, preferably overnight. If the pressure has dropped slightly (which is natural when the air temperature changes), then the repair was successful.
You can also smear the joint with soap solution again, and the absence of bubbles confirms the tightness of the joint, and if you notice a tampering, don't be upset, because sometimes you need to reheat and roll if the glue is not fully activated.
The table below contains the main parameters that should be considered when choosing glue and drying:
| Type of glue | Drying time (layer) | Activation temperature | Complete polymerization |
|---|---|---|---|
| Desmocoll (2 comp.) | 20-30 minutes | 50-70°C | 24-48 hours |
| Texacol UR | 15-20 minutes | 60-80°C | 24 hours. |
| PVC glue (1-comp.) | 10-15 minutes | No, he doesn't. | 12:24 hours. |
Frequent errors and ways to fix them
One of the most common mistakes is not enough degreasing. Even a microscopic film of fat or dust can break the adhesion, and the valve will unstuck under pressure. Always use clean wipes and fresh solvent. Also, often beginners overheat the tissue with a hairdryer, which leads to deformation of the PVC structure and the appearance of microcracks.
Lack of rolling pressure is the second reason for failure: glue must tightly connect the surfaces, squeezing out all the air. If you don't have a special roller, use a smooth screwdriver handle wrapped in cloth, or a rubber roller. The movements must be confident and directed from center to edge.
- ❌ The use of glue with an expired shelf life leads to a lack of adhesion.
- ❌ Attempt to glue cold surfaces without heating (for heat-activated adhesives).
- ❌ Pumping the boat before the time of complete polymerization of the glue.
If you notice that the valve started to "walk" or poison after some time after the repair, it is better to immediately redo the work. Operating a boat with a semi-glued valve is dangerous, since under load the breakaway can become instantaneous and catastrophic. Quality. repair is more important than speed.
⚠️ Warning: Do not repair in cold or high humidity, the optimum temperature for PVC is from +15 to +25 degrees Celsius, in cold, the glue does not polymerize correctly.
The quality of surface preparation and compliance with the temperature regime during gluing is more important than the brand of the glue itself.
Tip: To make the valve screw more easily and less injure the thread, lubricate the thread of the new part with silicone lubrication or regular soap before installation.
Valve care and prevention
To make sure that PVC boat valves are not replaced too often, you need to take good care of these elements. After every fishing or walk, wash the valves with fresh water, especially if you have been swimming on salt water. The salt crystallizes and can damage sealing gums or threads.
When packing a boat for storage, make sure all valves are open and relaxed. Do not keep the boat deflated under heavy objects in the valve area, as this can lead to deformation of the landing place. Periodically lubricate the thread with silicone to prevent the mechanism from souring.
Check the petals and rubber bands regularly, and if you notice that the valve has become sour when the cap is closed, the inner pad may have worn out, and it takes a couple of minutes to replace it and doesn't require glue, allowing you to quickly eliminate the leak without any minor repairs.
Keeping these simple rules will prolong your boat’s life and allow you to enjoy the water, not the constant repairs. Remember that timely prevention is always cheaper and easier than eliminating the consequences of negligence.
Can I replace the valve without removing it from the cylinder?
Yes, in most cases, the replacement is done directly by boat, and the valve is only required to be removed in case of serious damage to the tissue around it, when a full entrapment of the penet is needed.
Which glue is better: single or two-component?
For critical units such as valves and seams, it is better to use a two-part hardener adhesive that provides a stronger and more durable connection that is resistant to loads and temperature changes, although it requires more complex preparation.
How much dried PVC glue?
The initial drying time is 20-30 minutes, but full polymerization and maximum strength set take from 24 to 72 hours.
What if the valve falls inside the cylinder?
If the valve has unstuck and fallen inwards, it can be removed using a long tweezer, a hook on a fishing line or a magnet (if there are metal elements in the valve design).