A polyvinyl chloride (PVC) inflatable boat is a reliable craft, but even the strongest material wears out over time. One of the most common problems owners face is losing air valve seals. If your boat has started to flow and the valve itself does not block the flow, you should not immediately panic or carry the balloon to the service center. In most cases, replacing or installing a new one. safety-valve This is a procedure that can be performed independently at home with a minimum set of tools.
Proper operation of the valve is critical for water safety, as it supports the safety of the valve. work pressure A faulty element can lead to deformation of the bottom, reduced driving performance and even an emergency situation in a strong wave or wind. The installation of a new product requires accuracy, cleanliness and strict adherence to the gluing technology, because the quality of the seam depends on whether the boat will stay afloat during the next exit. In this article, we will discuss all the stages of work, from choosing the right model to the final seal check.
Types of valves and selection of components for replacement
Before you start dismantling an old element, you need to determine exactly the type of valve installed on your boat. The inflatable watercraft market offers many modifications, and although they may look similar on the surface, their landing dimensions and design often differ. BravoThe squirrels that are used on Flagman, Hunter and many other brands. Bombard, Sevylor and specific models for high-pressure inflatable floor boats (HPDBs). universal solutions does not exist, and an attempt to install an inappropriate thread or diameter valve will damage the balloon.
When choosing a new kit, pay attention to the fabrication material. Quality valves are made from durable plastic with brass or stainless insert inside, which ensures durability when in contact with water and the sun. Cheap analogues can crack when intruding or deform under the influence of ultraviolet. Also, make sure that the kit comes with a stainless coat. locker (interior), which is often sold separately from the outer hull. For boats with rigid bottom and inflatable tubes of the "floorboard" type, valves with the function of ejecting excess pressure are often used, which is also worth considering when buying.
Keep in mind the consumables. For a reliable fixation, you'll need a special PVC glue (usually a two-component polyurethane) and possibly a reinforcement tape or patch made of the same material as the boat itself. cyanacrylate ("superglue") is strictly prohibited, as they make the material brittle and can not withstand the stress of tearing, and prepare a solvent to degrease the surface to ensure maximum adhesion.
Necessary tools and workplace preparation
A well-designed workspace is not possible without a well-organized valve installation. You will need a clean, dry and well-ventilated room with an air temperature of at least +15 °C and not above +25 °C. Humidity also plays a role: in damp conditions, the glue can dry longer or not grasp at all. Prepare a flat surface on which you can put the balloon, and make sure that it is free of dust, dirt or sharp objects that can damage the fabric.
To work, you will need the following set of tools:
- 🔧 A special hexagon key or removable to unscrew the old valve (often bundled with a boat or sold separately).
- 🧼 Solvent (acetone, white spirit or special degreasing) and clean rags without pile.
- 🖌️ A brush for applying glue (if it is not built into the tube) and a spatula for smoothing.
- 🌡️ Building hair dryer (to accelerate drying and activation of glue, if required by the instructions).
- ✂️ Scissors and a sharp knife to trim excess material.
⚠️ Warning: Never use an open fire or a too hot dryer near the cylinder. Overheating of PVC fabric above 60-70 C can lead to irreversible deformation or destruction of the material structure, which will make the boat unusable.
Special attention should be paid to the preparation of the cylinder itself. The installation site should be completely dry. If the boat was stored in the garage or in the country, let it warm up to room temperature before work begins. Cold glue falls worse, and cold surface can form condensation that is invisible to the eye, but will negate all efforts to glue. Carefully inspect the landing site: if the old valve was installed curved or there are bloating around it, additional treatment of the edge of the hole may be necessary.
If you do not have a special key for unscrewing the valve, it can be made independently from two bolts inserted into the spool holes and slats, but it is better to purchase the original tool so as not to damage the thread.
Dismantling of old valve and surface cleaning
The first step is to remove the faulty element, which requires completely flushing the air out of the cylinder, insert the key into the valve slots and start gently twisting it counterclockwise, and it's important not to overdo it, because if the valve is "sticky" or rusted, don't use excessive force to avoid turning the inner nut or damaging the fabric around, and in such cases, you can warm the connection with a hairdryer slightly, but very carefully.
Once the valve is removed, you will see that the inside (the response nut) of the valve may have remained inside the cylinder. It must be removed through the valve opening. This can be done with a tweezer, hook or magnet on a long handle if the nut is metal. Carefully clean the inner surface of the balloon around the hole of the residues of old glue, dirt and oxides. For the outer part of the balloon, use a solvent and a scraper (plastic or wooden) to remove the entire old adhesive layer down to the PVC material.
The quality of the surface preparation is 90 percent of the success of the whole operation. If there are any greasy patches or particles of old glue on the fabric, the new layer will not lie evenly. degreaser Do not touch the surface with your hands, because the skin fat also reduces adhesion. If you notice that the tissue around the hole has dissected or has cracks, you need to put a larger reinforcement patch before installing the new valve.
☑️ Preparation for valve installation
Technology of installation of new valve
The process of mounting a new valve depends on the type of adhesive and the design of the element itself. Most modern PVC boat valves are sticker-type, meaning that the outer part of the valve is glued into the cylinder fabric, and the inner nut presses the material on both sides, creating a mechanical connection reinforced by glue.
Apply the first thin layer of glue on the cleaned surface of the balloon around the hole and on the back of the new valve (usually a wide skirt). Let the first layer dry to the "lip" (time indicated on the glue package, usually 10-20 minutes). Then apply the second layer and let it dry again. If you use the two-part glue, make sure it is thoroughly mixed. Carefully insert the outer part of the valve into the hole, tightly press and smooth out the bubble to expel the entire perk out of the air.
Now you need to lock the inner nut, insert it into the hole inside the balloon (or outside if the design allows, and pull through the hole) and screw it onto the thread outside. Don't tighten the nut to the end right away! First let the glue grip for the time specified in the instructions (usually 12 to 24 hours). After the complete polymerization of the adhesive, you can make the final key lift, which ensures that the adhesive suture does not shift during the tightening.
| Parameter | Recommendation | Critical significance |
|---|---|---|
| Sticking temperature | +18...+25°C | Below +10°C / Above +35°C |
| Drying time (first layer) | 15-20 minutes. | Less than 5 minutes. |
| Time of complete polymerization | 24-48 hours | Less than 12 hours. |
| Checking pressure | Worker (indicated on the valve) | Exceeding 20%+ |
⚠️ Note: If you are installing a valve on an inflatable floor boat (BBB), make sure the valve model is designed for high pressure. Conventional valves for on-board cylinders may not withstand the load and burst.
Features of installation on boats with NDND
High-pressure inflatable floor (HPD) boats require a special approach, and the pressure in such cylinders can reach 0.25-0.3 bar and above, which puts a serious strain on the valve attachment points. The condition of the tissue around the hole is critical. Often on boats with HPD, additional reinforcement tape or “pupacs” of denser material are used in the valve installation sites.
When replacing the valve with PDH, it is recommended not just to paste the new element, but to strengthen the connection site. If the old valve stood for a long time, the tissue under it could weaken, in which case, before installing the new valve, it makes sense to paste a reinforcing circle of PVC tissue with a diameter of 3-5 cm more than the diameter of the valve skirt, this will redistribute the load and prevent the valve from tearing apart under pressure.
What to do if the thread is broken?
If the valve or the back nut is broken, don't try to use the sealant as a replacement for the mechanical connection. It's a temporary and dangerous solution. You need to buy a new valve kit. If the thread in the fabric itself is damaged (rarely, but it happens when you're dragging), you need to replace the entire balloon or the complex interlacing of the seat by professionals.
It is also worth checking the condition. return-valve It's under constant stress in NDND systems, make sure that the rubber seal is elastic and non-crackable, replace only the inside if necessary, matching it to the size, and the spool works properly to ensure that it pumps quickly and doesn't etching air during storage.
Checking of tightness and final assembly
Once the glue is completely dry and the nut is tightened, you need to do a test. Don't rush the boat to the water. Pump the balloon to the working pressure and leave it for a few hours (preferably a day) in a warm room. If the pressure dropped slightly (within a temperature error), then the installation was successful.
You can use a soap solution to look for micro-leaks, apply a thick soap foam to and around the valve gluing site, and the bubbles will indicate the presence of a fistula. If the bubbles come from under the valve skirt, the gluing failed and you have to repeat the procedure. If the air is poisoning through the center of the valve, the problem is in the spool or sand that hits the seal.
The final step is to assemble all the elements. Install a valve cap that protects the thread from dirt and water. Check all the valves on the boat, as often failure of one element indicates general wear or improper storage conditions (for example, the boat was long inflated in the sun).
The main secret of the valve durability is not to pull it during pumping and always close it with a protective cap after use so that dust and moisture do not get inside.
Frequently Asked Questions (FAQ)
Can you replace the valve without removing it from the boat?
In most cases, the old valve is not soldered completely if the fabric around it is intact, but you just have to twist the inside and paste the new valve over the old hole, first cleaning the surface, but if the installation site is damaged, it is better to remove the old skirt completely.
Which glue is better to use for PVC: single or two-component?
For responsible units such as valves, it is strongly recommended to use two-component polyurethane adhesive. It provides higher seam strength, resistance to water and temperature changes compared to single-component counterparts.
Why does the valve poison the air even when closed?
Most often, the reason is because of contamination of the sealing gum with sand or salt. Try washing the valve with clean water or replacing the rubber seal. If that doesn't help, the valve body or the saddle itself may be deformed.
How long does it take to dry the glue before pumping the boat?
The minimum polymerization time is 12 hours at a temperature of +20 ° C. However, to achieve maximum strength of the seam, it is recommended to withstand gluing 24-48 hours before the first full use.
Can I warm the glue dryer to dry faster?
You can only use a dryer to activate the glue (short-term heating before gluing) or to accelerate the drying of layers. You can not heat an already glued and installed valve with a powerful jet of hot air, this can disrupt the structure of the glue and deform the plastic.