Operation of an inflatable vessel inevitably confronts the owner with the need for maintenance, and often the most difficult point is the question of how to unscrew the valve on a PVC boat without damaging the fabric. Inflatable valves (Bravo, B2, B8) are a critically important element of tightness, but over time they become clogged with sand, lose the elasticity of the gasket or require a complete replacement due to mechanical damage. polyvinyl chloride The fabric around the sticker will turn a simple repair into an expensive restoration of the balloon.
In this article, we will discuss in detail the mechanics of the locking device, the necessary tools and an algorithm of actions that will allow you to perform maintenance qualitatively. Repair specialists They know that rushing is not acceptable, as the hull material requires delicate handling, especially if the boat has been in operation for several seasons and the material may be “tired”, and understanding the design will help you avoid common mistakes and keep your boat tight for years to come.
Before proceeding to active actions, you need to assess the condition of the product and prepare the workplace. Temperature conditions It's important: it's best to work at room temperature, when the PVC fabric is as elastic as possible and not cracking. If you're planning to not just clean but replace the element, make sure you have all the necessary components on hand.
Inflatable valve design and types
To understand how to properly dismantle a piece, you need to understand its design. Most modern boats are equipped with a new type of equipment. petal-valvesThe design is usually made up of an external threaded cover, an internal movable stem with a spring, a sealing gum and a main body that is glued into the cylinder fabric. valve-base The bottom part most often requires replacement or cleaning, as it comes into contact with the inner cavity and is subject to contamination.
There are several standards of sizes and shapes, but the most common are the models Bravo, B2, B8, as well as their counterparts from manufacturers. Nissan Marin or frigateDespite the external differences, the principle of attachment is similar: the outer part (locking mechanism) is screwed into the inner (base), clamping the fabric of the cylinder on both sides. Tightness It is provided not only with a threaded connection, but also with special rubber gaskets, which eventually tan and require replacement.
It is important to note that some budget models can use simplified systems without a spring mechanism, where locking occurs solely due to air pressure and the shape of the petals. maintenance It is a minimal cleaning, as there is almost nothing to disassemble, but for full-fledged inflatable boats with high pressure (up to 0.25-0.3 atm), it is the composite design that requires periodic attention.
Necessary tools and workplace preparation
You can't have a good repair without the right tools, and you don't need a sophisticated electrical tool to unscrew the valve on a PVC boat, but you need a set of special tools. key-fork (sometimes called a "comb" or "comb"), which often comes complete with a boat repair kit. If the original key is lost, it can be made by yourself from a piece of durable plastic or use a specialized metal key sold in boating stores.
In addition to the key, you will need auxiliary materials for cleaning and lubrication. Isopropyl alcohol Or a special degreasing agent is needed to clean the threads and surfaces of the fabric before assembly, and stock up on silicone lubricant that is not aggressive to rubber and PVC, which will prolong the life of the seals. petroleum products (gasoline, kerosene) or aggressive solvents, as they can destroy the structure of rubber pads and damage the adhesive layer of fabric.
☑️ Preparation for valve disassembly
Preparing a workplace isn't just a formality, it needs to be completely blown away and straightened out on a clean, flat surface without sharp objects, and sand and dirt that gets under the fabric during work can scratch. polymer Or you can get inside the threaded joint, break the leakage, and if you're working outside, make sure there's no wind that can lift the dust, or use a canopy.
⚠️ Warning: Never try to unscrew the valve while there is residual pressure in the cylinder. Even a slight strain of tissue around the valve bag can lead to a sudden jump of the mechanism and injury to the hands or damage to the thread.
Step-by-step instructions: how to unscrew the valve
The dismantling process requires precision and consistency, and you first have to unscrew the inner movable part (the locking mechanism), press the stem to unlock it, and turn counterclockwise until it's fully extracted. outer-cover The valve that holds the whole structure, and that's the one that needs to be unscrewed with a special key.
Insert the fork key teeth into the appropriate holes at the end of the valve. Make sure the key sits tightly and does not slip. Start turning counterclockwise with moderate force. If the valve is boiling with salt or dirt, do not use excessive force immediately - try to gently tap the key or use it. WD-40 (with care not to get on the cloth) to soak the sediments. A sharp jerking effort can rip the edges off or, worse, twist a sticker inside the balloon.
If the thread is acidic, try to warm the outer part of the valve slightly with a hair dryer at low temperature for 10-15 seconds. The heat will expand the metal and soften the contamination, making it easier to unscrew.
When the outer part is unscrewed, you'll see the bottom part (base) that's inside the cylinder, and in most cases, to completely replace it, you have to pull it out, either with your fingers if the hole allows, or with tweezers or a hook through the neck of the valve. sticker It's not clamped at that point, and sudden movements can damage the adhesive seam, so if the base is sitting tight, you can lightly smack it with a plastic blade, but not a metal one.
| Valve type | Diameter of thread | Tool. | Puff moment |
|---|---|---|---|
| Bravo (standard) | ~40 mm | Key fork (plastic/metal) | Up to the point + 1/4 revolution |
| B2 / B8 | ~30 mm | Small fork key | Average effort |
| Brass threaded | different | Carrot key/Passatigues | A strong puff. |
| Spring (spring) | ~35 mm | Universal key | Control puff |
After all the components have been removed, make a defect. Check the carvings for burrs. sealing-ringIf you see corrosion on the metal part, you have to clean it with fine sandpaper, try not to scratch the deep groove for the gasket, and the clean and dry valve is ready for installation or reassembly.
Typical problems and methods of their elimination
One of the most common problems is that air etching through a closed valve is often caused not by a hole, but by a grain of sand trapped under the valve. sealerIn this case, you just have to twist the inside, wash the machine with water and blow it with compressed air, and if the problem is a gasket that has lost its elasticity, it needs to be replaced, and temporary measures like oil lubrication have only a short-term effect and can contaminate the inside of the balloon.
Another common situation is scrolling the valve along with the fabric, which means that the adhesive connection of the base to the tissue is broken. Repair of the sticker It's possible at home, but it requires careful surface preparation, two-part polyurethane glue and a high-quality roll. You can't just twist the valve more strongly in this case, you just tear the fabric around the hole.
What to do if the thread on the valve is broken?
If the thread on the metal part of the valve is torn off or severely deformed, repair is impossible; you need to purchase a new valve of the same size, attempts to restore the thread with the file will lead to leakage and failure of the valve under pressure.
There's also the problem of a tight valve, where it's hard to press to blow air, or it's poisoning it in the open, which is often due to a skewed spring mechanism or getting dirt into the guides. silicone spray If the machine is deformed, it's better to replace the whole movable part, because safety on the water is more important than the cost of the remix.
⚠️ Warning: When assembling the valve, make sure the rubber gasket is installed correctly and not clamped. Excessive tightening of the metal cover can cause the rubber band to be squeezed out and leakproof at the most inopportune moment.
Installation of a new valve and leakproofness check
The assembly is done in reverse order. First, the bottom part (base) of the new valve is placed in the opening in the cylinder. If you change the valve completely, make sure that the edges of the opening in the fabric are smooth and have no tears. When installing the new sticker (if the base changes too), you need to adhere to the gluing technology: degreasing, applying glue, activation and strong roller roller roller. For a standard replacement of the "iron", you just need to insert the base inside.
Then you screw the outer cover, you twist it with your hand to the end, and then you use the key to make the final fixation. Don't pull it over! Puff moment It should be such that the valve does not hang, but the fabric does not deform excessively. After installing the movable part with the rod and spring, assemble the whole mechanism. Check the spring: it must confidently return the rod to the closed position.
The main rule of assembly: the purity of the thread and the correct position of the sealing gasket is more important than the force of twisting.
The final step is to test. Pump the balloon to working pressure and leave the boat for a few hours (preferably overnight) in a warm room. Use a soap solution to control: apply a lot of foam to the assembled valve and wait. The appearance of bubbles will indicate the place of etching. If bubbles appear at the junction of metal and fabric, the problem is in the puff or gasket; if the tissue around the valve itself is damaged sticker.
Prevention and care of the valve system
Regular maintenance prolongs the life of an inflatable vessel. After each trip, especially on sandy beaches or in salt water, it is recommended to rinse the valves with fresh water. The salt is krillized and can "cox" the mechanism, and the sand works as an abrasive. Periodically, once a season, it makes sense to twist the valve insides and lubricate the valve. silicone thread and spring.
When storing the boat in a deflated state, leave the valves open (unscrewed or in the ejection mode). This will prevent mold from forming inside the cylinder due to residual humidity and relieve stress from the spring mechanism. Keep the boat in a dry place, avoiding temperature changes that can accelerate aging. PVC material and rubber components.
Always have spare gaskets in the remix and ideally a whole spare valve. The market is full of modifications, and finding a counterpart in the back of the road can be difficult. Knowing how to unscrew and replace a PVC boat valve ensures independence from service centers and confidence in the reliability of your boat.
Can I use a sealant to seal the valve?
The use of sealants (sanitary, automotive) to seal PVC boat valves is strongly discouraged. The chemical composition of sealants may be incompatible with PVC and rubber, causing their destruction. In addition, the sealant will make subsequent repair or replacement of the valve extremely difficult.
Can I unscrew the valve without a special key?
Theoretically, you can use pliers by wrapping your sponges in tape, or make a plywood/plastic key. However, the risk of damaging the soft metal of the valve or tearing off the edges is very high. A special key is inexpensive and is a must-have piece of equipment.
Why is the new valve poisoning?
The reasons may be in the skewed gasket during assembly, the presence of sand on the thread, too weak or excessive puff, or in the marriage of the rubber cuff itself. Check the purity of the parts and try to tighten the valve with a key.
How to determine the size of the valve for replacement?
The best way to measure the diameter of the opening in the fabric and the distance between the slots for the key, you can also take a picture of the valve with the ruler and show the consultant in the store. Standard dimensions (Bravo, B2) are often interchangeable by seat.
Do I need to lubricate the valve thread before twisting?
Yes, light grease with silicone compound will make it easier to disassemble and protect the thread from corrosion, the main thing is not to use oil-based oils that can eat the rubber.