The situation when flyboat It's a pressure loss, it's always taken by surprise, especially if you're on the shore before you go out, and it's not the puncture in the tank that's most often the cause of the leak. valveIt's a common problem that owners of both budget models and high-end brands like this face. Badger or KazankaUnderstanding the design of the unit will help to quickly fix the malfunction and avoid expensive repairs in the workshop.
And the leaks through the valve system can be for all sorts of reasons, from the usual contamination to the mechanical damage to the seals. Unlike the hole in the tissue that you have to look for with soapy solution all around the perimeter, here the search area is clearly limited. balloon If you blow it away in the area of the sticker or the mechanism itself, you need to act immediately, and ignoring the problem will lead to the fact that on the water the boat becomes unmanageable and dangerous.
In this article, we will discuss in detail the device of valves, methods of their diagnosis and step-by-step replacement algorithm. glue The key is not to panic, because in 90% of cases, repairs can be done independently in a garage environment using available materials and technology.
Types of valves and causes of their failures
Before you start repairing, you need to determine the type of device installed on your boat. The most common petal valves (often labeled as "petal valves") Bravo or A) and screw (type) B or NNThe petal models have a simple design with a rubber cuff that is pressed down by air pressure, the screw versions are equipped with a movable spool that is screwed and twisted to eject air or pump.
The main reason why valveIt's also a common problem, because it wears rubber seals, and over time, it swells, cracks, or deforms, so it's not leaky, it's also a common problem to get sand, silt, or small debris between the sealing surface and the response part, and even a grain of sand the size of a poppy grain can be a conduit for high-pressure air.
Mechanical damage occurs when you're not properly transported or pumped. If you're using an electric pump without pressure control, you can go above the limits, which will cause the valve to be squeezed out of the seat or to tear tissue around it. PVC fabric due to a violation of gluing technology during production or exposure to aggressive chemistry.
⚠️ Warning: Never leave a pumped boat in direct sunlight for long periods of time, and heating the air inside the cylinders leads to a critical increase in pressure that can deform the valve or damage the seams, even if they were initially fine.
- 🔍 Pollution: Sand, dirt or salt between petals or carvings.
- 📉 Wear: Natural aging of the seal rubber or loss of elasticity.
- 💥 Mechanics: Impacts, pressure exceeding or distortion during installation.
- 🧪 Chemistry: The effect of solvents, gasoline or oils on the structure of rubber.
Diagnosis: how to find the location of the leak
Accurate diagnosis is half the success of a repair. air It's through the valve, don't rush to disassemble the boat. The initial inspection is visual and audible. Pump the balloon to the operating pressure (usually 0.2-0.25 atm) and listen. The characteristic squiggle sound often indicates the depressurization site.
To define it more accurately, use a soap solution. Mix the water with a liquid soap or shampoo in a ratio of 1: 5 and apply abundant foam to and around the valve area. If there is a leak, bubbles will grow rapidly on the surface. Pay special attention to the junction of the plastic valve housing and fabric, as well as the central axis (stack) in the screw models.
Sometimes the leak is so microscopic that the bubbles are not visible immediately, so leave the applied solution for 5-10 minutes. tightness For screw valves, try to unscrew the spool and see if the air is going out through the hole without it. If the air is holding without the spool, the problem is with the valve mechanism itself, not with the sticker.
Required tools and materials
For a quality repair, you'll need to prepare a workplace and a set of tools. PVC materials The main consumable is a special glue for polyurethane fabrics. Don't use "Moment" or universal adhesives, they will not provide the necessary elasticity and strength of the seam, which is constantly under stress of bending and bloating.
The best choice is a two-component polyurethane adhesive, often labeled as "boat" or "PVC" and comes with a hardener that must be mixed before use, or a single-component one that requires heating to be activated, and you'll also need a degreasing agent (acetone or special solvent), a glue brush, a dryer, and a roller.
If you plan to replace the valve completely, make sure that the new element has exactly the same geometric dimensions as the old one. sticker The screw valves may also require a new spool assembly if the old one fails.
- 🧴 Clay: Two-component polyurethane composition for PVC.
- 🧼 Solvent: Acetone or a specialized degreasing agent.
- 🖌️ Tool: Brush, roller, knife, hair dryer, marker.
- 🛠️ Expenditure: Sandpaper (grain 220-400), rag.
Valve replacement technology: step-by-step instructions
The process of replacing the valve requires care and temperature. First, you have to dismantle the old element. If the valve is screwed, unscrew the spool. If it is glued, carefully cut it with a knife, trying not to damage the fabric of the cylinder. The residue of old glue and fabric carefully clean to make the surface smooth and smooth.
The surface preparation is a critical step: the place of sticking and the back of the new valve should be covered with sandpaper to create roughness (adhesion), then the surface is degreased with a solvent. Apply the first thin layer of glue on both glued surfaces and let it dry to "stick" (usually 15-20 minutes), then apply the second layer and dry again.
The final stage is gluing. To activate the surface glue, you often need to heat the dryer to 60-70 degrees (the glue becomes sticky and stretches with threads), combine the valve with the hole, press tightly and roll carefully from the center to the edges, expelling air. The load on the seam can only be given after complete polymerization of the glue (from 12 to 24 hours).
☑️ Checklist before gluing
⚠️ Attention: Work with polyurethane glue and solvents only in a well-ventilated room or on the street. solvent vapors are toxic and flammable, do not allow open fire near the workplace.
Comparison of repair methods: paste or sealant?
There are many online suggestions for using a variety of leak sealants, but it is important to understand the difference between professional repair and a crutch. Plugging a new valve using two-part glue provides a monolithic bond that is as strong as the factory sealant, while using sealants (silicone, bitumen) only has a temporary effect.
Sealants do not have the necessary adhesion to PVC under load. When pumping a boat, the balloon expands, and the sealant layer will simply peel off or crack. In addition, having the residue of the sealant on the fabric will subsequently make it very difficult to repair properly, since the glue will not fall on the fatty silicone base. So if you want to make the boat reliable, choose the method of gluing.
Below is a table comparing the main specifications of methods of restoration of tightness:
| Parameter | Sticker (2 comp. glue) | single-component glue | Sealants/Liquid rubber |
|---|---|---|---|
| Strength of the seam | Tall (monolithic) | Medium | Low. |
| Elasticity | High. | Medium | Other. |
| Term of service | 5-10 years | 2-3 years | Week/month |
| Complexity | Requires skills | Just | Very simple. |
Can I use the valve in winter?
Pluting PVC in the winter in an unheated room or on the street is absolutely impossible. Polyurethane adhesives require temperatures above +15 ° C for normal polymerization. At low temperatures, the glue will not "grab", but crystallize, and the seam will collapse immediately after pumping the boat. If repair is urgent, bring the boat into a warm room for at least 24 hours before and after repair.
Prevention and proper maintenance
And valve-system After every fishing or walk, especially in sea water, wash the valves with fresh water. Salt is an aggressive abrasive and corrosive agent that destroys rubber seals and metal parts of the spool, just rinse them out of the bottle and wipe them with a soft cloth.
When assembling a boat, always use safety caps to prevent dirt, sand and insects from entering the machinery; if the cap is lost, it can be replaced with a suitable carving plug or simply keep the valve closed. Also keep the pump clean: the hose should not be rolled in dust before connecting to the boat.
Keep the boat straightened or slightly flattened, but don't leave it tightly pumped in storage. Constant overpressure stretches the fabric and deforms the valve seals. Optimal storage pressure is minimal to keep the boat in shape, or complete air venting during long winter storage.
Tip: Before long-term storage, lubricate the screw valve thread and rubber seal with silicone lubricant. This will prevent the rubber from drying out and jamming the mechanism during the winter.
Frequently Asked Questions (FAQ)
Can you seal the valve with a patch on top without cutting it out?
No, it's inefficient. The pressure from the inside will tear the patch off. The valve must be cut out and pasted in a new one, or (rarely) dismantled and re-glued if it's intact. The patch sticker over the active valve will create only the illusion of repair.
What pressure is considered to work for inflatable boats?
For inflatable bottoms (NDB) and cylinders of most rowing boats, the operating pressure is 0.2-0.25 atmospheres (about 200-250 mbar). For boats with an inflatable keel, the pressure in the keel can be higher - up to 0.6-0.8 atm.
How much dried PVC glue?
The time of primary polymerization ("grabbing") is 2-4 hours, but the full strength of the seams gains after 24-72 hours depending on temperature and humidity. It is recommended to load the boat (pump full pressure and lower it into the water) no earlier than in a day.
Why isn't the new valve fitting in the thread?
There are many standards for valves (Bravo, A, B, C, H, N, etc.) They can have the same outer diameter of the base, but different spool threads or different heights. When buying, always check the markings or take the old valve with you to the store for comparison.
Quality valve repair in compliance with the sticking technology returns the boat to the factory tightness and safety, making it suitable for operation for many more seasons.