Inflatable boat owners are faced with the need to replace or maintain fittings sooner or later, most often when the problem arises when the water is in the water. valve It stops holding air or starts to poison the carvings, and it's made worse by the fact that the part can stick to the fabric during operation, and standard removal methods don't work, and understanding the design of the unit and the right approach to dismantling will help avoid damage to the expensive cylinder.
There are several types of valves, but the most common ones on the market are Bravo models or their analogues. PVC material It's similar: the inside is screwed into the outside, clamping the fabric together, but over time, when exposed to moisture, salts and temperature changes, the thread can oxidize, which is why the question of how to remove the valve from the PVC boat without tearing the tissue becomes critical to keeping the vessel tight.
Before you start to act, you need to visualize the condition of the node, and if you notice mechanical damage to the plastic or severe corrosion of the metal thread, the risk of failure increases. dismantling It requires special care and the preparation of a special tool, and ignoring the preparatory stage often leads to the fact that you have to cut out the old valve and put a patch, which is not always aesthetically and reliably.
Necessary tools and workplace preparation
And you can't have a quality without the right tools, and you need not only a special key to remove the valve, but also a little tool to make it easier. valve-key (often bundled with a boat or sold separately) It is a metal rod with two pins at the end that enter the holes on the inside of the valve.
However, if the part is too boiling, one key may not be enough.
- 🔧 A special two-pin key of the corresponding diameter (usually 18-20 mm for standard valves).
- 🧴 Penetrating lubricant (WD-40 or analogues) for thread processing.
- 🧼 A solvent or alcohol to degrease the surface around the valve.
- 🧽 Soft rags to remove dirt and excess chemicals.
The workspace should be well lit and the surface on which the boat lies clean and dry. It is important to ensure that the cylinder is stable so that when you apply the force key boat does not slip. If you work in a garage or workshop, it is recommended to fix the balloon with soft stops, which will allow you to direct all the effort to unscrew, not to hold the boat.
⚠️ Warning: Never use the passages or gas key to grip the outside of the valve unless it is removed. You can damage the plastic case, crumbling it or, worse, tearing the cylinder fabric with the sharp edge of the tool.
Diagnosis of valve assembly condition
Before you start spinning, it's important to understand what problem you're facing. The valve may not unscrew for all sorts of reasons, from the commonplace sand pollution to the chemical welding of plastic. If the valve is just tight, it helps to increase the lever. If it's dead, you need to apply chemistry. Visually inspect the thread: if you see traces of white plaque, it's oxidation that needs to be neutralized.
Owners often confuse jamming of the spool with jamming of the valve itself. The spool is the internal movable part responsible for releasing air. If it is the only problem, you don't need to twist the entire valve out of the fabric. You just need to twist the center part counterclockwise and replace the sealing gum or the spool itself. Full replacement is required when air is etching around the base circle or the tightness of the sticker is broken.
Try pressing the center of the valve. If it's tight, but it's air-producing, it's the problem with the spool. If the air is poisoning around the base when you press it on board, you need to replace the entire valve assembly.
Particular attention should be paid to the type of material of the boat. reinforced PVC The methods may differ from the work with hypalon. PVC fabric is less elastic at low temperatures, so all work is recommended to be carried out in a warm room. Cold plastic becomes brittle, and the risk of cracking during dismantling increases significantly. Warming up to +20...+25 °C will make the material more malleable.
Step-by-step instructions for dismantling the valve
The process of removing the valve requires consistency and precision. First, you need to completely blow the air out of the cylinder. Pressure even in 0.1 atmosphere will interfere with untwist, creating resistance. After that, the surface around the valve is carefully cleaned of dirt, sand and grease. Use soft rags and degreaser so that the chemistry gets into the thread, rather than spreading through the tissue.
The main stage of work follows:
- Insert the key into the openings of the inner part of the valve.
- Holding the outside with your hand (or a special ring, if any), start rotating the key counterclockwise.
- If the valve fails, do not use excessive force at once. Make several turns in different directions to tear the thread from the spot.
- If necessary, use a key extension (pipe), but act carefully so as not to break the plastic pins.
☑️ Valve removal algorithm
But there are models where the inside is twisted clockwise, and you can tell the direction by trying to turn the key a little bit, and if you're resisting right away, it might be the wrong direction, but most of the time, the problem is acidification.
Methods of dealing with the "stiff" valve
The most common situation that water motors face is that the valve doesn't unscrew, and that's because there's moisture, salts and degradation products between the threads, and in these cases, mechanical action can break the key or the valve itself, and chemistry and temperature can help.
The effective method is to use penetrating lubricant. WD-40 Or a similar device, right at the junction of the inner and outer valve, give the fluid time to penetrate the depths of the thread, at least 15-20 minutes, repeat the procedure 2-3 times, the chemistry will dissolve the oxides and make it easier to rotate. Some experts advise you to also use a hair dryer for short-term warming up of the plastic, but the temperature should not exceed 60-70 degrees, so as not to deform the balloon.
Folk method with boiling water
There's a boiling water method, where the inside of the valve (metal or plastic) is gently poured with a steep boiling water from the kettle, the plastic expands faster, and the threads are let go. It's a risky method for the fabric, requires precision, but sometimes helps where the chemistry doesn't take.
If the chemistry and the heat didn't work, you can try the rocking method. Put the key in, push it a little bit, and micro-move back and forth, trying not to break the pins. The goal is to create a vibration that will destroy the salt plaque. Sometimes it helps to hit the key handle with a light hammer (through a wooden pad), but this method requires jewelry accuracy and is not recommended for beginners.
⚠️ Warning: It is strictly forbidden to use an open flame (gas burner) to heat the valve. You can instantly burn through the cylinder or ignite adhesive fumes if the boat has previously been repaired.
Comparison of popular valve models
There are many valve modifications on the market, and they are not always interchangeable. Understanding the differences will help you choose the right tool and method of dismantling. The main differences are in the diameter of the thread, the number of turnkey holes and the material of execution.
The following is a table of the main specifications of common types of valves:
| Valve type | Diameter of thread | Materials | Features |
|---|---|---|---|
| Bravo (standard) | 36 mm | ABS plastic | The most common, 2 openings under the turnkey |
| Valmex | 38 mm | Plastic/Brass | It is used on German-made boats. |
| Intex | different | Plastic. | Often has a built-in return valve, a specific key |
| Boat (universal) | 40 mm | Metal | Rare, high-strength, requires a metal key |
When buying a new valve to replace, be sure to measure the diameter of the landing hole in the fabric. Standard dimensions are 36, 38 or 40 mm. If you make a mistake with the size, the new valve will either not stand up or will hang, which will lead to loss of leakage. Also pay attention to the height of the "skirt" of the valve, especially if the cylinder fabric has a thick layer of reinforcement.
There are no universal valves – always check the diameter and type of thread before buying a new part, as manufacturers’ standards can vary by several millimeters.
Installation of a new valve and leakproofness check
After successfully dismantling the old element, you need to prepare a place to install a new one. The fabric around the hole should be clean, dry and fat-free. If the old glue remains on the fabric, it should be carefully removed, but not damage the material itself. The new valve is also recommended to wipe with alcohol for better adhesion if the model is supposed to stick, or simply check the thread if it is screwed.
The installation process is reversed, you put the outside of the valve into the hole, then you wind the inside of the balloon, you tighten the key to the end, but without fanaticism. Excessive effort can cause the plastic to burst when you pump the boat under pressure. A sufficiently reliable fixation is a condition where the valve does not rotate with your hand, but does not deform the fabric around the hole.
After installation, be sure to run a leakproofness test. Pump the balloon to working pressure and leave the boat for a few hours (preferably overnight). Then check the pressure with a pressure gauge. If the pressure drops, soap the valve placement. Blisters will indicate that the valve is not tight enough or the gasket is damaged.
Frequently Asked Questions (FAQ)
Can I replace the valve on the boat without cutting out the old one?
Yes, 95% of the time the valve is simply twisted, cutting is only required if the tissue under the valve itself has rotted, ruptured, or if the valve has been glued to the ground (which is the case with older Chinese models without a threaded connection).
How to lubricate the valve thread before installation?
Use of conventional lubricants such as Litol or Solidol is not recommended, as they can corrode PVC. It is better to use silicone lubrication or leave the thread dry if the design does not require glue. For rubber seals silicone is suitable.
What to do if the pins inside the valve break when unscrewed?
If the key is twisted and licked the holes, try using a thin stitch or screwdriver, inserting them into the remnants of the holes at an angle, in extreme cases, if the valve is plastic, you can gently break it with passages, trying not to touch the fabric, and remove the remains in parts.
What glue should I use if the valve needs to be glued?
For PVC, two-component polyurethane adhesives (e.g. Kleyberg, Texacoll or special adhesives for boats) are used. It is important to follow the technology: apply, let dry, activate with heat and press.