Loss of leakage is the biggest nightmare of any owner of a polyvinyl chloride boat, and most often the problem lies not in the cloth itself, but in the connecting elements through which air is supplied. PVC boat valve It is the most loaded unit of the whole structure, as it constantly experiences pressure, temperature changes and mechanical impact during pumping.
It is through this node that 90% of all air leaks occur, which can turn a pleasant walk into a rescue operation. Understanding the device, operating principles and maintenance methods of this element is critical to water safety. In this article, we will discuss in detail how to diagnose a malfunction, replace a worn-out part and prevent sudden depressurization.
Repairing or replacing a valve system often seems difficult only at first glance. With the right tools and knowledge, you can restore tightness even in the field. The main thing is to act consistently and use only compatible materials so that the fabric of the board is not damaged.
Inflatable valve design and operation
Modern. pump-valve It's a complex piece of engineering, and it's made up of several key components, and it's based on a rigid plastic case that's glued or welded into PVC fabric, and it has a movable mechanism inside it that locks the air and doesn't let it escape.
The principle of operation is based on the difference in pressure and the operation of the spring mechanism. When pumped, the air overcomes the resistance of the spring, opening the passageway. Once the pressure from the outside drops (the pump is removed), the spring returns the locking element to its original position, sealing the system.
- 🔵 Outside. has a thread or smooth surface for connecting the pump.
- 🔵 Locking mechanism - a spool, petal or needle that blocks the flow of air.
- 🔵 spring - ensures the return of the mechanism to the closed state after pumping.
- 🔵 The sealing ring - rubber gasket, guaranteeing a tight fit of parts.
It's important to note that different manufacturers use their own standards for size and shape. Bravo different Bayard diameter and pitch of the carving. Carving incompatibility is the most common reason for the inability to pump a boat with an existing pump.
⚠️ Warning: Never force the pump into the valve if the thread does not match, which will cause the plastic thread to break off on the valve body, and then require a complete replacement of the assembly.
The main types of valve systems for PVC boats
The boating market is dominated by several standards, each with its own operating specifications, and knowing the type of system you have will help you quickly pick up a pump remix or adapter.
The most common standard is the system. BravoIt's characterized by a central rod with a needle that blocks the air out, and you need to press a finger or a cap to get the air out, and it's a reliable and time-tested design.
The second popular type is Bayard Here, the locking is done by an elastic petal pressed by airflow, and these systems are often found on high-pressure inflatable floor boats (HPDVs), because they are better at holding high pressure and less prone to sand jamming.
| Valve type | Principle of action | Where do you meet? | Features |
|---|---|---|---|
| Bravo | needle-gate | Budget and medium-sized boats | You need to press the needle to squirt. |
| Bayard | Petal | Boats with NDND, boats | High tightness, no moving parts |
| With the discharge valve | Automatic/Manual | Boats for seafaring | Protection against pumping in the sun |
| Two-way. | Combined | Specialized machinery | Allows you to blow the air quickly |
Special attention should be paid to the systems of discharge-valve They automatically or manually release excess air when the boat is in the sun for a long time, and this prevents the seams from rupturing because of the expansion of the gas.
Diagnosis of malfunctions: how to find a leak
It's pretty easy to tell if the valve is the problem, if you know the signs, and often the owners are guilty of microcracks in the cylinder, wasting time looking for holes when the cause is more trivial. Air leakage Through the valve is usually accompanied by a characteristic hissing, which can be heard in silence.
The first diagnostic method is visual and tactile. Pump the boat to working pressure and apply soap solution to the valve area. Bubbles will indicate where the air is coming out. If the joints of plastic and fabric are bubbled, the sealability of the sticker is broken. If the bubbles come from the center, the problem is the mechanism.
The second method is to check the locking element, and try to press the center of the valve carefully (if it's a Bravo) and it should walk smoothly, without jamming, and return to its original position with a characteristic click, and if the valve is stuck in the open position, the boat will poison the air constantly.
- 🔍 Check for any dirt or sand inside the machine.
- 🔍 Examine the rubber sealing ring for cracks.
- 🔍 Make sure that the protective cap is tightly twisted (it also seals).
⚠️ Note: Do not use sharp objects (knives, screwdrivers) to pick inside the valve when trying to clean it. scratches on a plastic cone or needle will lead to permanent leakage that cannot be repaired without replacement.
Technology of valve replacement DIY
Replacing the PVC valve for the boat is a procedure that requires accuracy and compliance with the temperature regime. You will need a new valve (required to be of the same diameter and type), a special glue for PVC (two-component polyurethane) and a solvent.
The process begins with the dismantling of an old element. If the valve is screwed in (rarely, but in repair versions), it is twisted out. If it is glued, it must be carefully cut out, trying not to damage the fabric of the cylinder. The residue of old glue and plastic is carefully cleaned.
☑️ Preparation for valve replacement
Then there's the gluing step, the surface of the fabric and the new valve area are degreased, the glue is applied in two layers: the first layer is rubbed into the fabric, the second is applied after the first one is dry. PVC glue.
After joining the parts, you need to provide a strong press. Use a load or a special roller. To achieve maximum strength of the seam, it is recommended to warm the gluing site with a building hair dryer to a temperature of 50-60 degrees, but not overheat the plastic so as not to deform it.
Selection of glue and materials for repair
The quality of the repair depends on the adhesive you choose, and the usual "moment" or superglue is not suitable for boats, because they are not elastic and break down under the influence of water and loads. polyurethane glue.
The most popular two-part compounds are those that mix with the hardener before application, and they create a seam that is as strong as the boat material itself. Texacol, Radostor, Klejpur.
When choosing, consider the life of the mixture and the time of full polymerization. Fast-drying adhesives are easy to work with, but give less time to adjust the position of the valve. Slow adhesives take longer to dry, but provide better adhesion.
Also important is solvent. To prepare the surface and dilute the glue (if necessary), use only the manufacturer's recommended solvents, usually toluene or special PVC cleaners. Use of acetone is permissible only for degreasing, but not for adhesive dilution.
Prevention and care of inflatable fittings
And valve-system It's been in service for a long time, it needs minimal maintenance, but it needs regular maintenance, and after every trip, especially on salt water or in muddy conditions, the valves need to be washed with fresh water, and salt and sand are the main enemies of sealers.
When storing the boat in a deflated state, make sure that the valves are open (the air is ejected) so that the spring does not have a constant voltage. It is better to keep the boat in a straightened form or in a free twist, avoiding cloth cloth cloth in the area of the valve sticker.
Before a long stand on the water (for example, fishing with an overnight stay), check the pressure in the cylinders in the morning. Due to the night cold, the pressure drops, and it may seem that there is a leak. Pumping to normal is a normal procedure.
What to do if the valve is lost on fishing?
In an emergency, if the valve is out or broken, you can temporarily plug the hole with a tightly rolled piece of cloth, a bottle plug, or even a finger while you row to the shore.
Can I change the valve in the winter?
Gluing PVC at temperatures below 15°C is highly discouraged, the glue may not catch or crystallize, and if repairs are needed in winter, take the boat to a warm room the day before repair.
Why is the new valve poisoning?
Most often, the reason is poor surface cleaning before gluing or insufficient time to dry the glue, and factory defection of the plastic product itself (crack in the case) is also possible.
How often should the valves be changed?
When properly operated, the valves last as long as the boat itself (10-15 years), and replacement is required only in the event of mechanical damage or loss of leakage that cannot be repaired by cleaning.
What is the difference between a boat valve and a SUP board valve?
SUP boards are more commonly used standard Halkey-RobertsIt can withstand higher pressures (up to 1 atm and higher) than classic boat valves.