PVC inflatable boats are a reliable and popular means of getting around on water, whether it is fishing or just relaxing. However, even the best quality material and professional assembly do not guarantee eternal service without maintenance. One of the most common problems that boat owners face is the malfunction of the inflatable valve. It can start poisoning the air, stop holding pressure or simply jam in the open position, which requires immediate intervention.
The question of how to unscrew the PVC valve is not as rare as fishermen would like. The reasons can range from simple sand pollution to mechanical damage to the seal or strain of the thread. It is important to understand that ignoring this problem can lead to a complete loss of buoyancy on the water, which is not safe. In this article, we will discuss in detail the process of dismantling, diagnosing and replacing the valve so that you can return your boat tightness with your hands.
Before you start to do something, you have to prepare the workplace, you need a clean, dry, well-lit space where the boat can be easily laid out, you don't have to try to repair the muddy beach or the dusty garage, because it's not acceptable to get abrasive particles between the layers of fabric when you install a new element, and the right preparation is half of the success in restoring the leakiness.
Diagnosis and preparation for repair
The first step is always to make a thorough diagnosis. Don't rush to grab the tools if the boat is just slowly deflating. Sometimes the problem isn't with the valve mechanism itself, but with debris falling under the petals or damage to the tissue around it. Visual examination It can help you determine if there are cracks, ruptures or severe deformities in the plastic valve body, and if the plastic is soaked, brittle or has visible chips, replacement is inevitable.
You often use a soap solution to check for leakage, and you can apply a thick foam to a pumped valve, and you can watch for bubbles to come in, and if the bubbles come out of the carving or out of the center, the seal is broken, and in some cases, it's enough to just clean the mechanism, but if you have a leak, you can't get the seal out of the carving. pellet or Nisamar It's physically destroyed, you have to twist it, and it's also important to see if it's been pulled before, which could have caused the thread to break off on the back.
⚠️ Warning: Never try to unscrew the valve while the boat is inflated! air pressure can knock out the tool or damage the cylinder fabric, making repair impossible.
The preparation involves not only inspection, but also the selection of the right tool. The standard key, which comes with a boat, is often made of soft metal and can lick the edges. It is better to use a special hard alloy key or a high-quality plumbing key with soft sponges, so as not to damage the decorative ring. You may also need a hair dryer to warm up the fabric if the valve is “stick” or glue has dried.
Required tools and materials
The quality of the repair depends on what you do. Successfully dismantling and installing a new element will require a certain set of tools. You should not use improvised tools such as pliers or screwdrivers, as they are guaranteed to damage the plastic structure. A specialized tool is inexpensive, but it will save you nerves and time.
The main instrument is valve-keyThey come in different variations depending on the type of seat: two-skid, round with spikes or versatile. PVC boats are most often used keys size 27 mm or 35 mm. If you plan to do maintenance boats regularly, it makes sense to purchase a set of keys that will suit most popular models of inflatable floaters.
In addition to the key, you may need:
- 🔧 Construction hair dryer - for careful heating of the place of sticking, if the old valve is removed with force.
- 🧼 Degreaser (acetone or alcohol) - to clean the surface around the hole before installing a new element.
- 🧽 Soft rag. - to remove dust and residues of old glue.
- 📏 Syringe - for accurate application of glue under the cuff of the new valve.
If you remove the valve completely (cutting it out or unplugging the cuff), you will need a special glue. polyurethane For PVC, conventional household adhesives are not suitable because they cannot withstand pressure and temperature changes, the adhesive must be two-part or require temperature activation, depending on the technology of the boat manufacturer, and the use of inappropriate chemicals can corrosive the fabric of the balloon.
If the valve thread is acid and does not unscrew, try dripping a few drops of penetrating lubricant (such as WD-40) onto the threaded joint, but be careful not to let the liquid get onto the PVC fabric.
Step-by-step instructions for dismantling the valve
The process of untwisting the valve requires care and consistency. The main rule is not to use excessive force so as not to damage the tissue of the cylinder. If the valve does not respond, then you are doing something wrong, or you need preliminary preparation (heating, lubrication).
First, blow the boat away completely. Make sure the pressure in the cylinders is atmospheric. Then find a removable valve ring (if designed) and twist it counterclockwise. This will allow you to access the main part of the mechanism. If the valve is solid or you plan to change it completely with the sticker, the actions will be as follows:
☑️ Checklist of dismantling
Put the key in the valve slots. Make sure it sits tight and doesn't turn. Start turning counterclockwise. The movements should be smooth, without jerking. If you feel strong resistance, stop. Perhaps the thread is contaminated or deformed. In these cases, it helps to lightly sway the key from side to side to tear the "stiff" area. Fabric around the valve At this point, it should be straightened so that it does not have to twist the tension.
If the valve is glued into a fabric (meaning the very base that the plastic glass is inserted into), and you change it completely, after you unscrew the plastic part, you will need to carefully separate the cuff from the cylinder. This is done with a hair dryer and a sharp knife. Heat the gluing site to 50-60 degrees and slowly peel off the cuff. Carefully act so as not to damage the main material of the balloon. After removing the old element, the surface must be cleaned and degreased.
| Valve type | Diameter of the hole | Key type | Features of dismantling |
|---|---|---|---|
| Bravo (Bravo) | 27 mm/35 mm | Two-horned | Often soured thread, requires lubrication |
| Nisamar (Nisamar) | 38 mm | Round with spikes | Tight landing, need a good focus |
| Bombard (Board) | 35 mm | Universal. | Standard thread, easily removed |
| aquamarine | 27 mm mm | Two-horned | Plastic can be fragile in the cold |
Replacement of seals and maintenance
Often, a complete valve replacement is not required, but rather a worn-out sealing ring or spring, and inside each valve there is a system of petals and rubber pads that keep the valve sealed, and over time the rubber tans, cracks, or loses its elasticity, especially if the boat is kept in the wrong conditions.
To maintain, unscrew the valve by twisting the top, remove the spring and inspect the rubber rings, and if they show cracks, scuffs, or become hard to the touch, they need to be replaced. Repair kit It usually includes a set of these seals, and you can lubricate the new rings with silicone lubricant before you install them, which will prolong their life and ensure smooth operation of the mechanism.
Where can I get the seals?
Valve sealing rings can be bought at specialty boating stores, repair shops or online under the article of your boat model. Often standard rubber rings made of plumbing remixes, if the diameter matches.
It's also worth checking the spring. If it's lost its elasticity or rust (which is the case in cheap models), the valve will not close well or open well. You can try to clean and lubricate the rusty spring, but you can replace it with a new stainless steel. The cleanliness of the inner surfaces of the valve is the key to its long operation. Wash all the parts with warm water and soap before assembly.
Installation of a new valve and sealing
If you choose to install a new valve instead of the old one, it is important to properly prepare the installation site. PVC surface should be clean, dry and fat-free. If you are pasting a new cuff, apply a thin layer of glue on both glued surfaces (the cylinder fabric and the valve cuff). Let the glue dry to the "straw" (usually 10-15 minutes, read the instructions on the tube), then apply the second layer.
Once the second layer has dried (or immediately, depending on the type of glue), connect the surfaces. Press the cuff tightly against the balloon, expelling air bubbles from the center to the edges. Use the roller to ensure maximum contact. Then insert a plastic glass of valve into the hole and twist it back with a key clockwise. Don't pull the thread! Excessive force during tightening can lead to the extrusion of the mangent from under the glue or tearing tissue.
⚠️ Warning: Complete glue polymerization takes 24 to 72 hours, and do not inflate the boat or test it for leakage before the time specified in the adhesive instructions.
After installation, check the mechanism, inflate the boat and leave it for a few hours, if the pressure does not drop and the soap test does not show bubbles, then the repair is successful, regularly check the condition of the valves before each season, lubricate them and clean the sand to avoid problems in the future.
The quality of the gluing and the correct tightening of the thread are two main factors that determine the reliability of the installed valve.
Frequent mistakes and how to avoid them
When self-repairing, beginners often make common mistakes that negate all efforts, one of the most common is the use of inappropriate glue, rubber glue or a universal "Moment" will not provide the desired strength of the PVC fabric joint, and as a result, under air pressure, the valve will simply "shot" along with a piece of fabric.
Another mistake is ignoring the temperature regime, gluing the valve in the cold or in the heat is impossible, the optimal temperature for working with PVC is from +15 to +25 degrees Celsius, in the cold, the glue does not polymerize, and in the heat can boil or grab too quickly, before you have time to penetrate the tissue structure, and often forget to degrease the surface, which leads to no adhesion.
- ❌ Use of dirty tools Dust and grease on keys or rags worsen the quality of gluing.
- ❌ Haste - Attempting to inflate the boat ahead of time leads to inflating of the glue that has not yet risen.
- ❌ Carving frothing - deforms the plastic valve body, making it leaky.
Avoid using abrasive materials to clean the surface around the valve. sandpaper can damage the protective PVC lacquer layer, and at this point the fabric will begin to break down faster under the influence of ultraviolet light. For cleaning, it is better to use a special abrasive mesh or simply carefully degrease the surface.
What to do if the thread is broken?
If the thread on the plastic glass is torn off, but the sticker itself is intact, you can try to replace only the plastic part, choosing the same size. If the thread in the back part (in the fabric) is damaged, you will need a complete re-adjustment of the valve with a new cuff.
Frequently Asked Questions (FAQ)
Frequently Asked Questions (FAQ)
What is the best way to lubricate the valve thread before twisting?
For greases and seals, silicone lubricant is best used. It is not aggressive to plastic and rubber, does not wash off with water and maintains elasticity at low temperatures. Do not use solidol or lithol, as they can erode some types of plastic and rubber.
Can one type of valve be replaced with another (for example, Bravo on Nisamar)?
You can't just replace it, because they have different diameters of landing holes and different cuff designs, and to replace the valve type, you'll need to cut out the old hole and paste the new cuff under the right diameter, which is a complex repair that requires professional skills and equipment.
Why does the valve poison the air even if it is tightly twisted?
There are several reasons: a grain of sand hitting the seal, a deformation of the rubber gasket, a crack in the plastic valve housing, or a leakage at the place where the valve is pasted into the cylinder fabric. Start by cleaning and replacing the seals.
How long does the PVC glue dry?
The initial grip time is 15-30 minutes, but the glue is fully durable after 24-72 hours, depending on ambient temperature and humidity, and it is recommended to keep the boat in an unstretched state for at least a day before the first pumping.