Loss of pressure in an inflated vessel is always a nuisance that can take you by surprise on the water, and most often the cause of air leakage is damaged or polluted. pump-valveBoat owners often panic about the complex replacement of the entire cylinder, but in most situations, the problem can be solved independently without resorting to service centers.
Quality repairs can restore tightness in minutes if you have the necessary tools and materials at hand, and it is important to understand the design of the unit, since modern models can be significantly different from the old Soviet counterparts of the “frog” type. PVC Boats They require careful handling, but their repairability is high with the right approach.
In this article, we will discuss all the nuances of diagnosis, cleaning and replacement of valve elements. You will learn how to distinguish a minor malfunction from a serious damage and what materials to use for the purpose of repair. sealingThe boat is kept under pressure even in the cold.
Valve types and their design features
Before you start repairing, you need to identify the type of device you have installed on your boat, which determines the method of disassembly and the toolkit you need, and the market is dominated by several basic designs, each with its own specifications.
The most common type is the valve. Bravo (or its equivalents), which is used on most modern polyvinyl chloride boats, and consists of an outer hull screwed into a cylinder and an inner removable part with a spring. Removable part It allows you to blow air or pump the boat without unscrewing the main element.
Older models, such as the frog or Soviet valves, often lack a removable core and require a more complex replacement procedure. High Pressure For inflatable floors and keels that can withstand much greater pressure, understanding the type of valve you have is critical to choosing a remix.
- 🔧 Bravo Standard for most boats, easy to maintain, has a removable spool.
- 🔧 Frog obsolete design, often requiring complete replacement or complex bulkheading.
- 🔧 High Pressure - used for NDND, withstands high pressure, has a reinforced design.
Some manufacturers may use their own modifications, but the way they work is the same, the main difference is the diameter of the thread and the way the interior is fixed, and if you're not sure about the model, it's best to take a picture of the valve and consult the seller before buying the parts.
Diagnostics of malfunctions and search for leaks
The first sign of a malfunction is that the boat needs to be pumped more often than usual, but it takes careful consideration to confirm that the valve is the problem, not the microcracking of the balloon. diagnosticsIgnoring this stage can lead to the purchase of unnecessary parts.
The simplest method is to use a soap solution. Spread the foam profusely on and around the surface of the valve, then press on board or leave the boat in the sun. The appearance of bubbles will indicate the location of the leak. If bubbles come from under the thread of the removable part, the problem is the sealing ring or contamination.
⚠️ Warning: Never use open flames to look for leaks! this can damage the PVC fabric or cause adhesive vapor to ignite if the boat has recently been repaired.
If the soap solution shows bubbles at the point where the base of the valve is glued to the fabric, the situation is more serious, it can mean layering of the material or poor-quality factory gluing. cylinder repair using patches.
It's also worth checking the mechanical integrity, and check the carvings for chips, and the spring for corrosion, and sometimes the valve just jams with sand, and it stops keeping the air closed.
Required tools and materials
To do this, you'll need a minimal set of tools that you want to carry around in a repair box, and not having a suitable key can turn a simple replacement into hours of torture, with the risk of damaging the boat.
The main tool is a special key for the valves, often included with the key. pump Or the boat itself, but the owners often lose it, and if the key is not there, you can make it yourself from durable plastic or metal, cutting out a profile that corresponds to the inner edges of the valve.
For sealing and degreasing will need:
- 🧴 acetone Or a special degreaser for PVC.
- 🧴 Clay. Polyurethane (two-component for reliable repair).
- 🧴 A patch. from reinforced PVC (if necessary, base repair).
- 🧴 Fen (construction or household) for heating materials.
It is important to use materials that are compatible with the material of the boat. The use of glue for rubber on polyvinyl chloride will not work, the connection will be fragile and quickly break down under load. Polyurethane adhesives provide chemical welding of materials, creating a monolithic connection.
If you don't have a special key, use pliers with rubber linings on the sponges carefully, so as not to damage the valve edges.
Replacement and maintenance of the Bravo removable valve
Process of replacing or maintaining a type of valve Bravo It doesn't require the boat to be taken off the water or blown away completely if the design allows access to the interior.
First, you need to completely release the air from the compartment. Then, using the key, twist the inside counterclockwise. Be prepared for the spring to pop out, so hold the mechanism with your hand. Remove the spring and plate, inspect them for damage.
Often the cause of leakage lies in the banal contamination: sand or a blade of grass caught between a rubber seal and a plastic case violates the tightness. thoroughly rinse all the parts in warm water with soap, remove the remaining salt and dirt with a soft brush.
Sequence of action:1. To flush.
2. Unwrap the core with the key.
3. Rinse the parts and the body.
4. Lubricate the seal with silicone (optional).
5. Roll it back to full speed.
If the valve continues to poison after cleaning, replace the rubber sealing ring. If the plastic case itself is damaged or the thread inside the cylinder is removed, more complex repairs will be required using the use of a rubber sealing ring. patch-up and glue.
☑️ Check-list of valve maintenance
Repair of the base of the valve and replacement of petals
When the base of the valve is damaged, the place where the tissue is pasted, requires more serious intervention, often when hitting rocks or transporting them carelessly, in which case simply replacing the insides will not help.
To repair, you need to cut the damaged area of tissue around the valve, leaving a margin of 3-5 cm. Then a new patch of PVC is applied with a new valve already pasted or inserted.
| Work phase | Tools | Drying time |
|---|---|---|
| Surface cleaning | Sandpaper | - |
| Degreasing | Acetone, rags. | 5-10 minutes |
| Applying glue (layer 1) | Brush, spatula | 20-30 minutes |
| Applying glue (layer 2) and gluing | Walik, hairdryer | 24 hours. |
It is critical to clean the surface of the fabric and the patch itself, and the smooth layer of PVC must be treated with sandpaper before the mattage appears so that the glue can penetrate the structure of the material. adhesion It depends on the quality of surface preparation.
⚠️ Warning: When heating the fabric with a hairdryer, do not allow it to melt; the temperature should not exceed 60-70 degrees Celsius; the fabric should be warm to the touch, but not hot.
Once the patch is glued, the pressure must be uniform throughout the seam. Use a heavy sand bag or a special roller. Complete polymerization of the glue takes up to 24 hours, after which pressure tests can be performed.
How to properly heat glue?
The dryer must be used carefully, warming both surfaces to be glued; the movements must be continuous so as not to overheat one point; the glue is ready to be glued when it stops sticking to the finger, but retains stickiness (called "stick").
Prevention and care of inflatable elements
To repair valves on the PVC boat is not required every season, you must comply with the rules of operation and storage.
Check the pressure in the cylinders regularly, especially when the ambient temperature changes. In the sun, the air expands and the pressure can exceed the permissible limits, which puts stress on the seams and valves. In cold weather, on the contrary, the pressure drops and the boat becomes sluggish.
After every fishing or walk, wash the boat with fresh water, paying special attention to the area around the valves. Salt, silt and sand are abrasives that destroy material and clog machinery. Keep the boat in a dry, cool place, preferably in a straightened form or in a free roll.
- 🛡️ Do not leave the boat in the direct sun in a pumped state for a long time.
- 🛡️ Avoid contact with sharp objects and open fire.
- 🛡️ Periodically lubricate the moving parts of the valves with silicone lubrication.
Following these simple rules will allow you to forget about sudden leaks and enjoy a vacation on the water. Remember that timely care is cheaper than buying a new boat or complex repairs in the workshop.
Regular washing and proper storage are the key to the long-term service of valves, sand and salt are the main enemies of the tightness of inflatable elements.
Frequently Asked Questions (FAQ)
Can I replace the Bravo valve with another type?
Theoretically, you can, but it requires cutting out the old base and pasting the new one, so the diameter of the hole and the thickness of the fabric should match, and the easiest way to change it to the same model from the same manufacturer or the full size.
What is the best way to degrease the surface before gluing?
The optimal remedy is pure acetone or a special degreasing agent for PVC. Gasoline or solvents with additives can leave a greasy film or damage the structure of the plastic, which will worsen the quality of gluing.
Why does the valve poison after replacing the seal?
The new seal may not be the right size or stiffness, but it could also be due to a micro-crack on the plastic valve body or to contamination of the seat inside the thread.
What pressure is considered normal for cylinders?
For most PVC inflatable boats, the operating pressure is 0.2-0.25 atmospheres (about 200-250 mbar). For the floors of the NDNDN, the pressure can reach 0.4-0.6 atmospheres.