Also, either ring may be made of hard or soft material. A wide variety of carbon face seal options are available to you, such as free samples, paid samples. The seal faces must be continuously lubricated in order to prevent pick up or galling. Its corrosion resistance and natural lubricity provide two of the features we need in a good seal face material. The most common objective for the face treatment is to reduce the magnitude of mechanical contact.
In such cases, a secondary sealing element might be manufactured from perfluoroelastomer and shaped in the form of a wedge, V or U. For example, springs may be rotating or stationary. In some designs, various retainers, sleeves and other components may also include secondary sealing elements. In contrast, mating ring hardware might be only a pin or slot to prevent rotation. These fillers serve to improve the strength, thermal conductivity and tribological characteristics of the material. The Clean Air Act of 1990 placed limits on fugitive emissions from pumps.
It makes little sense to save money on the seal only to have to spend more money to replace the seal later. A fine talc is desirable. In general, face treatments provide a means of modifying the pressure distribution between the seal faces through hydrostatic or hydrodynamic topography. If you wish, we will design a seal for you. High-speed applications — The ongoing demand for efficiency is driving rotating equipment to ever-higher speeds and lower dynamic friction. Marys Carbon is one of the few companies to make each and every product from the initial mixing of the carbon grades to the time it is shipped to our customers, each of our seals can be to your specific requirements.
A common material combination for the primary sealing surfaces is a hard material, such as silicon carbide, ceramic or tungsten carbide and a softer material, such as carbon. They also work well with high viscosity fluids and hydrocarbons because they are resistant to blistering. The installment size of the mechanical seal must be guaranteed to the installment instruction. Following the molding operation, the parts are sintered at temperatures high enough to carbonize the coal tar pitch. It is in the same family as Ceramic due to the Silica , but has much better lubrication qualities and is harder. The spring keeps the elements tight against each other, maintaining the seal and allowing for wear. Carbon-graphite seal face components and bearings are self lubricating, resistant to chemical corrosion, and capable of running at temperatures up to 538° C.
In 1957, Sealol introduced the edge welded metal bellows seal. Scores of base carbon materials are available with hundreds of modifications that can be customized for specific designs and environments. As a rule of thumb, the harder and more polished the surface, the lower the wear. This first impregnation will penetrate approximately 25 mm. Ceramic is a versatile seal face material, that is generally inexpensive. See Figure 1 Chemically aggressive environments — Chemically aggressive applications represent another application niche for carbon-graphite. We lap the hard seal face and then reassemble the seal, package it, and ship it back to you.
Cooke's seal which actually did not have a means of drive was first used in refrigeration compressors. Design factors Carbon-graphite bearings are used in both wet and dry operating conditions. Ni-Resist is a form of cast iron with a high nickel content to lower the friction generated by the mechanical seal's rotating face. A formed or welded metal bellows can also act as the spring. The drive mechanism must withstand the torque produced by the seal faces while also allowing the seal ring to move axially. The hydrocarbon will convert to carbon at this temperature.
The seal components may be conveniently pre-assembled into a cartridge for ease of installation. The holes can be filled with resins, metals, carbon or inorganic salts see Table 2 , depending on the planned use of the material. Connect, share, and learn today » Tweets by DesignWorld! In order to meet the distinctive requirements of our clients, our product-line is available in both standard and custom-build models. In general, design features are not completely independent; that is, emphasis of a particular feature may also influence other features. Q:Where is your factory located 9 A:Our factorty is located in Jiande, Hangzhou which is close to Shanghai and Ningbo Port. For other items,we will need 14-25 days for mass production depends on the quantity and types of the order. Lasers can be used to etch microscopic, performance enhancing textures on the surface of the seal face.
If you have any questions please contact us at: about your mechanical seals applications. In addition to torque, the drive mechanism must withstand the axial thrust produced by hydrostatic pressure acting on the components. Main Shaft Bearing Seals Kaydon carbon seal designs are primarily utilized as main shaft bearing seals in aerospace and aircraft engine applications. Carbon-graphite is inert to most chemical reagents so it survives where other materials fail. The seal companies pay for the necessary molds and then retain the exclusive use of them. What is your terms of packing9 A: Generally, we pack our goods in neutral white boxes and brown cartons. The crystals exhibit a turbostratic disorder, which makes the material extremely resistant to wear.
One of the most popular explanations is that a certain amount of fluid becomes absorbed in the carbon substrate and expands due to frictional heat, creating a subsurface pressure and an eventual crater in the seal face. These two rings are machined using a process called lapping in order to obtain the necessary degree of surface finish and flatness. The carbonization of the temporary binder leaves holes in the structure. Usually they are used in high pressure applications where superior strength is needed. Now you know about the advantages and disadvantages of both designs for those few times you get to make a choice.