Also known as sealing washers or packing washers (in certain tap types), tap washers are simple disc-shaped devices with a central hole or opening. They function as a type of gasket that helps to seal off mains water flow behind a tap when the tap head is turned to the ‘off’ position.
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Tap washers are commonly found in plumbing kits and tool boxes. The vast majority of tap washer uses are in performing quick replacement jobs. In most cases, they’re the go-to solution wherever a tap is dripping, leaking, or becoming difficult to open or close. Some examples of tap washer uses might include:
Tap washers are designed to be used in nearly all types of taps, where their key role is to help control the flow of water. They can also work to prevent leaking and contamination while a tap is shut off. Regardless of the washer type and material, their basic function is to press down against the seat or flow valve on the inside of a tap assembly, creating a closed-off seal that stops water from flowing to the spout when the tap head is turned to the ‘off’ position.
They achieve their purpose by creating an impenetrable physical barrier between the tap seat and the spout. The material construction of most tap washers also means that they’re able to fill and even out any irregularly-shaped voids between different parts of a tap fitting (generally the valve and the tap seat), effectively sealing off the tap spout from the valve.
When a tap head is turned on or off, a rotating screw forces the tap washer to move up or down (respectively) within the body of the tap assembly. This lifts it away from the seat and opens up the flow valve. In doing so, it allows pressurised mains water held in the plumbing system to pass through the tap spout at varying volumes and speeds. Key to this function is the fact that tap washers are typically made from materials that can be squeezed or compressed to form a watertight seal (although exceptions do exist for certain tap types). This enables them to seal off the valve opening more effectively, even in cases where general usage-related wear and tear has caused small surface irregularities over time.
However, there is a finite amount of wear that a washer, seat or valve opening can sustain before the sealing properties no longer work effectively. At some point, the washer or various other moving parts of a tap will need to be replaced. Most often, this is due to damage from water erosion, or physical stress and degradation caused by repeated mechanical or compression forces in normal use.
What are Rubber Washers?
Rubber washers are small, circular or flat-shaped components made of rubber that are designed to provide a seal or cushioning between two objects. They are commonly used in a wide range of applications, including plumbing, automotive, electronics, and construction.
Everything you need to know about Rubber Washers:
The main purpose of rubber washers is to prevent leakage or seepage of fluids or gases between the surfaces they are placed between. They act as a barrier that seals off any openings or gaps and prevents the flow of air, water, or other fluids.
Rubber washers are preferred over other materials because of their unique properties, including their ability to conform to surfaces and their resistance to chemicals and extreme temperatures. They are also highly flexible and can be easily manipulated into the desired shape or size.
Overall, rubber washers are essential components that play a critical role in ensuring the proper functioning of a wide range of machinery and equipment. Their importance in providing a leak-free and safe environment makes them a go-to choice for many industries.
Different Types of Rubber Washers
Flat Rubber Washers
These are the most common type of rubber washers typically used for applications where a tight seal is required between two flat surfaces. They come in a variety of sizes, thicknesses and materials, typically manufactured in a circular shape. The flat design of these washers allows for a larger surface area to be covered, making them suitable for applications where the load needs to be spread. They provide a reliable seal against air, water, and other fluids and are commonly used in plumbing fixtures, electrical equipment and machinery.
O-rings are similar to circular rubber washers but with a round cross-section, designed to fit into a groove and compress between two surfaces. This allows O-Rings to provide a seal in both radial and axial directions. O-Rings are available in a range of sizes and materials, often used for hydraulic and pneumatic systems where they provide a high degree of sealing effectiveness against pressure and fluid leaks. Additionally, O-Rings can be found in many common appliances, automotive vehicles and industrial equipment.
Bonded Rubber Washers:
These washers are made by bonding rubber to a substrate, such as metal or plastic. The bonding process is usually achieved through vulcanization, which results in an extremely strong and durable bond. Bonded rubbed washers are used in a variety of applications where a secure seal is needed between dissimilar materials including automotive fuel systems and industrial equipment. They come in a range of shapes and sizes and are typically manufactured from materials that are resistant to heat, chemicals and other harsh conditions.
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Benefits of using Rubber Washers
Rubber washers are often preferred over plastic or metal washers for many reasons, offering a unique set of characteristics and benefits, they are used in many industries all around the globe. But what are some of the key benefits of using rubber for washer manufacturing?
Sealing Properties: Rubber washers can provide an excellent seal due to their flexibility and the way they conform to the surface they are sealing. This can make them a more suitable choice over other materials such as metal or plastic, which will not create as tight of a seal.
Excellent Resilience: The resilience of rubber washers means they can recover their original shape even after being compressed or stretched. This means they can provide a long-lasting, reliable seal in applications where they will be subjected to repeated cycles of compression and expansion such as in valves and pumps.
Chemical and Temperature Resistance: Rubber washers can resist a wide range of chemicals, making them suitable for use in harsh environments where exposure to corrosives is common. Depending on the rubber material used, some rubber washers can withstand extremely high or low temperatures without losing any vital sealing properties.
Cost-Effective: Rubber washers are almost always more cost-effective than other types of washers. This makes them a popular choice for applications where a reliable seal is required but cost is a primary consideration.
Easy to Install: Rubber washers are easy to install and require minimal tools and equipment, making them a popular choice for many applications from DIY projects to large scale industrial work. Additionally, the flexibility of rubber washers means they can often conform to slightly uneven surfaces, making them easier to work with in certain situations.
How are Rubber Washers manufactured?
Rubber Washers are manufactured using various techniques and different machinery including CNC Digital Cutting, Hydraulic Punching and Waterjet Cutting. Among these methods, CNC digital cutting is the most common and versatile manufacturing technique for rubber washers. Here is an overview of each method:
CNC Digital Cutting
CNC (Computer Numerical Control) digital cutting is a precise and efficient manufacturing method for rubber washers. It involves using computer controlled cutting machines equipped with specialised tools to accurately shape and cut rubber materials. CNC digital cutting offers several benefits for rubber washer production including:
Hydraulic Punching
Hydraulic Punching is an older and more traditional manufacturing method commonly used for smaller production runs of rubber washers. It involves using a hydraulic press equipped with specially designed cutters to create the desired dimensions and holes in rubber materials. Whilst it might be suitable for small designs or low volume production, hydraulic punching is not as precise or efficient as CNC digital cutting.
Waterjet Cutting
Waterjet Cutting is a specialist manufacturing process used for cutting densers, harder or thicker rubber materials that cannot be easily cut with accuracy through the standard CNC cutting process. It utilises a high-pressure jet of water mixed with abrasive particles to precisely cut through the rubber material. Waterjet cutting offers the advantage of being able to handle more challenging materials but is typically reserved for specific applications where other cutting methods are not suitable due to the increased costs of using a waterjet machine.
In rubber washer manufacturing, CNC digital cutting stands out as a preferred technique due to its cost-effectiveness, reduced lead times and accuracy in production. However, hydraulic punching and waterjet cutting can be utilised when specific project requirements call for their unique capabilities.
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