Polyvinyl chloride inflatable watercraft have long been the standard for fishing and recreation on the water due to their reliability and compactness. However, even the highest quality materials are subject to wear and tear, and often fails. fittingsIf you notice that the boat is slowly poisoning the air or has stopped keeping pressure at all, the problem is 90% of the time the shut-off mechanism is the problem. air-valve It is very real at home.
The main function of this unit is not just to let air into the cylinder, but also to reliably hold it under pressure, eliminating reverse current. floatability Understanding how it works will help you quickly diagnose a breakdown, whether it's fouling the petal, deforming the spring, or leaking the adhesive to the fabric.
In this article, we will take a look at the various types of fittings, look at the tools you need, and step by step describe the replacement process. You will learn to distinguish between repairable defects and those that require a complete replacement part. The main thing is not to ignore the first signs of air venting, as on the water this can lead to a dangerous situation and loss of stability of the vessel.
Device and operation principle of the valve system
Standard. air-valve For boats, PVC is a two-piece structure, consisting of an external response (wrapped) and an internal one that sticks into the cylinder, between them the clutching of the side fabric, inside there is a spring-loaded rod with a rubber seal that covers the hole at a certain pressure, and there are also models with a petal mechanism, where the air flow is blocked by an elastic cuff.
The materials used to make the fittings must be resistant to salt water, ultraviolet light and temperature changes. ABS plastic Or brass with a nickel coating. tightness It depends not only on the integrity of the plastic body, but also on the condition of the rubber seals, and over time, the rubber tans or, conversely, loses its elasticity, no longer fitting tightly to the saddle.
⚠️ Warning: Never try to pump the boat with pressures that exceed the manufacturer's recommended pressure, even if the valve seems to be working. Exceeding the limit of 0.25-0.3 atmosphere can lead to rupture of the seams or deformation of the valve glass.
The principle is simple: when pumped, the air overcomes the spring resistance and passes inwards. When the pressure inside the cylinder is compared to the spring force, the valve closes. When the pump is inserted, a special pin forcibly opens the air to exit, and if this mechanism jams, the boat either does not pump or begins to deflate quickly.
- 🔧 hull: a base of durable plastic or metal, threaded connection.
- 🌬️ Shut-off element: a rod with a plate or a petal cuff.
- ⚙️ Spring: It regulates the closing force and working pressure.
- 🛡️ Sealer: a rubber ring that ensures tightness.
Modern models are often equipped with a system Safety LockThis is a way to prevent the waves from opening spontaneously when they hit the side, and this is especially true for high-speed vehicles. motorboatAnd you have a lot of vibration and fluid loads on the body, and knowing the device will allow you to make a good remix if the old valve fails.
Types of valves for inflatable boats
There are many modifications on the market, and there is no one-size-fits-all solution. thread-valve It's made up of two parts, connected by a thread, and it clamps the fabric of the boat. Badger, hunter and FlagshipTheir advantage is that they're easy to replace, and you just have to twist the inside and screw in a new one.
The second popular type is petal-valveThere's no moving metal or plastic parts inside, the backflow is blocked by a flexible rubber cuff, and they're more reliable in terms of mechanical breakdowns, because there's nothing to break, but they're more sensitive to sand and dirt. Cayman. and Master..
There are also different models and specific models for NDMA The latter uses a larger diameter fitting that can withstand pressures of up to 1 atmosphere or more. When buying a remix, it is critical to know the exact diameter and type of thread, since the visual similarity can be deceptive.
| Valve type | Application | Features | Difficulty replacing |
|---|---|---|---|
| Threaded (B733/B735) | Balloons, keels | Two-piece, clamping cloth. | Low. |
| Petal | Rowing boats | Lack of springs, sensitive to dirt | Medium |
| For NDNDM | High-pressure paioles | Reinforced body, high pressure | High. |
| Herbal (emergency) | Air descent | Large diameter, rapid reset | Low. |
And we also have to mention large diameter emergency herbal valves, which are used to quickly deflate the boat when packing. Although they rarely break, losing a plug on the valve can be a serious problem in the field. Always check for spare stoppers before you go out.
Diagnostics of malfunctions and leaks
Before you grab the tools, you need to precisely localize the problem. Often boat owners sin on the valve when the problem lies in a microcrack of tissue next to it or in a loosely closed traffic jam. Primary diagnostics are done visually and by ear: a pumped boat should not make hissing sounds. If you hear a whistle, then the leak is significant.
To detect small leaks that are not heard by the ear, you use a classic soap solution. Apply thick foam on and around the valve area. The appearance of growing bubbles will indicate the exit of air. If the bubbles come from under the thread or from under the skirt of the glued part, tightness If the bubble grows on the rod itself, the problem is the locking mechanism.
⚠️ When looking for leaks, do not use open flames or spark sources near the boat, even if it is empty.
A common cause of "etching" is the common pollution, the sand that gets between the seal and the saddle prevents the valve from closing to the end, in such cases, it is enough to just twist the inside, wash the mechanism with clean water and blow the cylinder, if after cleaning the problem persists, then the spring or the plastic case itself has deformed.
Use not just soap and water to check for leaks, but a thick soap solution (as for blowing bubbles), liquid water can quickly drain and not show a micro leak, and the foam will remain at the exit site.
It's also worth checking the integrity of the thread, and if you've pulled the valve with a key in the past, you could have microcracks on the plastic that would disperse under pressure, and then only a full valve would help. valve-replacementDon't try to seal a cracked case, it's a temporary solution that will fail at the most inopportune moment.
Tools and materials for repair
To make a good repair, you'll need a minimal set of tools that you can find in any garage, and the main requirement is the accuracy and cleanness of the workplace, and dust and dirt are the main enemies of adhesives, and the main tool for dismantling old valves is a special key-gate, often included with a boat, or its homemade counterpart.
If there is no special key, it can be made from two thick nails driven into a wooden block at a distance corresponding to the valve openings. valve-keyIt's a low-cost, low-cost, and it fits most models, and you'll need to stick in a new part.
- 🧴 Clay: two-component polyurethane adhesive (e.g., Desmocoll or specialized adhesives for PVC.
- 🧽 Degreasing: acetone, alcohol or a special PVC cleaner.
- ✂️ Scissors and scalpel: To remove the old valve carefully.
- 🌡️ Fen: building hair dryer for heating glue and fabric (normal will not work).
It's important to choose the right glue. A regular "moment" or rubber glue will not withstand the pressure and tearing loads that the valve experiences. You need a two-part composition that, after polymerization, creates a seam that is as strong as the boat material itself. Also prepare the load (sand bags) to press the surfaces to be glued.
☑️ Preparation for valve repair
Don't forget personal protective equipment. It's best to work with glue and solvents in a well-ventilated environment using gloves. Solvent vapors can be toxic, and getting glue on the skin requires immediate removal. Prepare the rags in advance to remove excess glue.
Step-by-step instructions for valve replacement
The process of replacing requires patience and technology. It is not a rush, because the quality of the gluing depends on the safety of the water. First, you need to completely lower the boat and provide access to the inside of the valve. If the valve is in a difficult place (for example, in the bow), you may have to partially embroidery the seam or use special manipulators, but in most cases it is enough to just turn the side of the valve.
The first step is to gently unscrew the old inside of the valve. If it's stuck, don't use excessive force to avoid damaging the tissue. Then, with a sharp knife or scalpel, cut off the outside of the valve, trying not to touch the cylinder tissue itself. Leave a small supply of material around, if possible, but most often cut all the way to clean tissue.
The most important step is to prepare the surface, and the fabric must be thoroughly cleaned with fine sandpaper, removing the top layer of PVC until it is matte, then the surface is degreased, the adhesive is applied in two stages: the first layer is rubbed into the fabric and dried until it is stuck (10-15 minutes), the second layer is applied to both surfaces and also dried.
⚠️ Attention, don't dry the dryer too hard, overheating the PVC tissue will cause it to deform and dissect, making it impossible to glue, and the hair dryer temperature should not exceed 60-70 degrees.
Once the glue is activated (a short-term dryer warm-up), the parts come together. Put the new valve in the hole, press it and roll it carefully from the center to the edges to drive out the air bubbles. Set the back part on top and tighten it with a key. Be sure to place the load on the glue site for 24 hours for full polymerization.
What to do if the glue does not dry?
If the glue remains sticky for more than 2 hours, it may be a mismatched mixing ratio (if the glue is two-part) or the room is too cold and wet. Try to carefully warm the gluing site with a hair dryer. If it doesn't work, you'll have to wash the glue off with solvent and start over.
After drying, be sure to test for leakage with soap solution. If there are no bubbles, you can consider the repair a success. Do not pump the boat with maximum pressure immediately after repair, let the glue gain final strength within 2-3 days.
Care and prevention of breakdowns
And air-valve After every fishing or walk, wipe the valve area with a dry cloth, removing sand, silt and salt deposits. The salt, when crystallized, can damage the thread or sealing gum. Periodically lubricate the rubber seals with silicone lubrication so that they do not dry out and crack.
When packing a boat, try not to fold the cloth directly onto the protruding valve. Pressure when rolled up can deform the plastic body or displace the rod. Use protective caps if designed, or simply monitor the valve position when rolled up.
Regular cleaning and grease with silicone is the best prevention of valve jamming, which takes 2 minutes, but prolongs the life of the node by many times.
Keep the boat straightened or half-deflated in a warm room. Dramatic temperature changes and cold storage make plastic brittle. If the boat winters on the balcony, put it in the heat the day before use, so that the materials are elastic.
Frequently Asked Questions (FAQ)
Can you replace the valve without removing the old one, just gluing the new one on top?
Absolutely not. The glue doesn't hold on the smooth surface of the old valve, and the tear-off load will be enormous. The old valve will be removed, and the surface of the tissue will be cleaned to the base for adhesion of the glue.
Which glue is better: single or two-component?
For high pressure valves, only two-component polyurethane adhesives are suitable. Single-component adhesives (based on rubber) are elastic, but will not withstand the shear and tear loads that occur at the valve installation point.
Why is a new, newly installed valve poisoning?
There are three reasons: insufficient drying time of the glue, poor surface cleaning (the gloss is left), or defect of the newest valve (the seal marriage), check with soap solution and redo the gluing if necessary.
Can I use a valve from one brand boat on another?
Only if the landing diameter matches the type of thread. Many manufacturers use standard valves (for example, the same type of valve). Bravo or B733), but it is always better to measure the diameter of the hole and the pitch of the thread before buying.
How long does the PVC glue dry?
Primary polymerization takes about 24 hours, after which the boat can be gently pumped for inspection, and full load and launching are possible in 48-72 hours, depending on the temperature and humidity in the room.