Gives the chemical resistance of PTFE however glass must be added to give the face hardness and to prevent cold flow issues associated with PTFE. The three basic classifications are:  The sealed product enters and exits the sealing gap as a liquid  The sealed product enters and exits the sealing gap as a gas  The sealed product enters the sealing gap as a liquid and vaporizes to a gas before it exits. This means the face materials selected must have good tribological pairings and are typically a soft vs. hard face combination. The old adage "pay me now or pay me later" applies to seals. The most common types of seal faces are: Carbon, Ceramic, Ni-resist, 17-4, Silicon Carbide, Tungsten Carbide, GFPTFE (glass filled PTFE.... often called Teflon (R)). Mechanical Seals - Face Materials. This evaluation should examine if the strength of the material is sufficient enough to prevent face fractures, especially if the higher pressure is on the inside of the face. Ni-resist - Is a form of Stainless steel which has had nickel added to it to lower the friction generated by the rotating face. For this reason, the materials should be evaluated against their interaction with the location and magnitude of pressure acting on the faces. Mechanical seals are more durable than their predecessors and use multiple sealing points to nearly eliminate any leakage issues. Typical features applied to mechanical seal faces include hydropads, lube grooves, hydrodynamic grooves, waves, or in some cases creating specialized flat-face seal face geometry. mechanical seal and is defined as In practice k values are selected between 0.65 and 1.2. Alox (Aluminum Oxide Ceramic), Tungsten Carbide, Silicon Carbide, etc.) Bronze D. Brass A. The other face will be a harder material (or have a different lapped surface) providing dissimilar materials (or dissimilar surface) making contact and allowing one to be a sacrificial. The first area of consideration when choosing seal face materials is the product phase (liquid or gas) as it enters and exits the mechanical seal sealing gap. On the other hand if you are pumping very clean fluid that has a lubricating quality such as machine oil or Ethylene Glycol, save your money for better quality bearings. A lower conductivity material will have a higher temperature gradient and distort the seal face in undesirable ways. Low cost, ability to conform to the opposing face, self-lubrication properties, and low coefficient of friction are just a few of the reasons for carbon’s popularity as a seal face material. The inherent self-lubricating properties of certain materials often come paired with a lower modulus of elasticity and the potential for significant pressure deformations. We focus on eliminating the common issues found in original types through improved design, technology and material compatibility. The coatings are "plasma coatings" and are generally a form or silicon or tungsten carbide sprayed onto a stainless steel seal head. Tungsten Carbide - A very versatile seal face like Silicon Carbide. Another group of seal faces would be those of coated seal faces. Chemical Mechanical Seal. The high pressure may require face geometry changes to the face wear nose to reduce the potential for high contact loads. Our standard grade of carbon used is CNFJ. We have gained expertise in manufacturing and exporting supreme quality Mechanical Seal that are specifically designed for our esteem clients.The offered range is manufactured using material which is sourced from authentic and reliable sources. A plug is a simple example of a mechanical seal. In dirty or contaminated applications, the properties and concentrations of suspended solids or crystallization particles becomes critical. The sealed fluid migrates between the flat faces and form… One must identify the application data (or operating conditions) to properly select the type of seal and materials of construction to ensure maximum performance from the seal over its lifetime. Its chemical name is Aluminium oxide (Al 2 O 3).It has two types, varying with purity composition of 96% and 99.9%. These show the resin carbon, with the lowest thermal conductivity, kept the heat trapped at the faces causing a higher temperature than the other two faces. In the two classifications where the product exits as a gas, the lubrication mode is going to be boundary lubricated or mixed lubricated. Special considerations are features added to seal faces intended to change the lubrication mode toward something that achieves the desired performance of the seals. In particular, these types of applications depend on the fluid viscosity to choose the right materials. The seals in these figures were run under the same operating conditions but only the left hand face material was changed. Once the initial seal combination has been chosen using the viscosity, a few other considerations have to be evaluated to ensure the face materials will perform as expected. However, even with these desirable characteristics, there are limits for this material such as a relatively low modulus of elasticity, poor thermal conductivity and low material hardness of the face. Head Type B. Even small temperature increases can have a large, indirect influence on the face material by changing the aggressiveness of corrosive fluids, affecting the phase change of the fluid, or decreasing the fluid viscosity.The rotational velocity of the seal face also impacts the choice of seal face materials. They have been sold by various trade names by the major mechanical seal companies but in our opinion are not worth the money. If soft vs. hard faces are required in these applications, then special considerations should be employed such as selecting seal designs with the process fluid at the outer diameter (OD) of the seal face and applying API Plan 62 external quench at the ID to flush away the particles on the atmospheric side of the seal. AI, visualisation to help reduce Covid risk in facilities, What API 682 says on mechanical seal selection, View past issues of Turbomachinery International Magazine, Subscribe (both print and online options available), Register for webcasts (live and on-demand). Material code designation example Preferred materials 3) DIN 24960, June 1980 1) EN 12756, Dec. 2000, return to DIN 24960, June 1992 4) Burgmann Design Manual 2) Shortway acc. To avoid this, it is generally practical to apply a hard vs hard face combination in higher viscosity fluids. However, certain soft materials, like carbon, are not recommended in higher viscous fluids due to high viscous shearing forces between seal faces which can cause a localized binder failure known as blistering. Identifier – EN 12756 Description; Spring materials: G: 1.4571 CrNiMo steel: M: Hastelloy C-4 Nickel-base alloy: Construction materials: D: C*steel: E: Cr-steel Grundfos CRN SHAFT Seal Kit Pump Cartridge Mechanical Seal CR32 45 64 90 Grundfos Sarlin Pump 62kW Pump Model S.2.100.200-550.66M.D.338.GND Upper & Lower Mech Seals 65 mm Grundfos CR 45, 64, 90 Pump Cartridge Mechanical Seal – Fits 32 45 64 90 The seal between the stationary member (1) and stuffing box face, i.e. Internal heat sources such as friction and turbulence can cause locally higher temperatures acting on a portion of the seal faces. Higher rotational velocities also increase friction-generated heat between the seal faces and create a larger thermal gradient that causes uneven wear or higher leakage. They will also shatter like a plate if dropped on concrete. The pressure from the plug will seal … In these cases seal vendors have continued to use these combinations, but apply special considerations to meet the seal’s performance expectations. • The mechanical seal faces are obviously the most critical sealing point of a mechanical seal assembly. Fluid Viscosity III. You must consider the environment the seal will be exposed to. GFPTFE - Say that one ten times.... Glass Filled PTFE (most people just say Teflon (R)). Your input is appreciated. The search to advance these limitations without sacrificing the excellent tribological properties has been a major driving force in the evaluation and advancement in carbon materials. All Rights Reserved. In general, low viscosity services are more likely to operate in boundary or mixed lubrication environments and thus are most appropriately sealed with a soft vs hard face combination. Axial thermal gradients across a seal faces can create uneven thermal expansion in the face leading to detrimental thermal coning. to DIN ISO 1629, Nov. 2004 Mechanical Seals (DM) Face materials (Item 1 / 2) Secondary seal components (Item 3) KOMA4) 13/4 13/3 11.98 2.88 Current material code It is even more intimidating knowing that the wrong combination of materials may lead to premature seal failure, which in turn leads to significant costs due to replacement of the seal, downtime of the pump, and potential damage caused to the equipment. Seal faces are exposed to a wide variety of process fluids. It is in the same family as Ceramic (due to the Silica), but has much better lubrication qualities and is harder. However the longer you keep your pump in service, the more cost effective a mechanical seal can be. © 2018 Mechanicalseals.net. It makes little sense to save money on the seal only to have to spend more money to replace the seal later. They are typically categorized as either a soft vs. hard or a hard vs. hard combination. Fluid loss will increase as gland packing material begins to wear down and may impair regular lubrication or reduce ease-of-replacement. 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. Mechanical seals areconstructed of a wide range of materials Fluids that crystallize or salt as they migrate across the faces or salt on the atmospheric side may also cause significant damage to a soft face. Head Type A. These sources can lead to unwanted thermal growth or retraction and potential destruction of the impregnation or binding material. Chemical Seal is a mechanical seal which is made of ceramic. AdButler.ads.push({handler: function(opt){ AdButler.register(166254, 443273, [620,150], 'placement_443273_'+opt.place, opt); }, opt: { place: plc443273++, keywords: abkw, domain: 'servedbyadbutler.com', click:'CLICK_MACRO_PLACEHOLDER' }}); The wide range of different materials available for mechanical seal faces makes choosing the right face combination seem difficult. Rings of ceramic, carbide, carbon or composites of these materials are lapped flat in the range of less than 1 micron on an axial end face. Things to Consider while selecting a Mechanical Seal Liquid. Hard vs. hard faces are typically applied in full fluid film applications that do not necessarily need good tribological properties since the face materials should not come into contact. Mechanical seals are one of the most effective ways of sealing rotating shafts, consisting of two lapped faces arranged perpendicular to the axis of the rotating shaft. In higher viscosity fluids, the fluid creates a full fluid film lubrication mode and allows either soft vs hard or hard vs hard material combination. Mechanical seals can operate for many years without issue, as long as they've been properly selected for their application. Silicon Carbide - Is a bluish-black material created by fusing silica and coke. It is even more intimidating knowing that the wrong combination of materials may lead to premature seal failure, which in turn leads to significant costs due to replacement of the seal, downtime of the pump, and potential damage caused to the equipment. Stationary mechanical seal in inch dimensions. Each mechanical seal requires at least two opposing seal faces. The more common end- or rotating-face mechanical seal designs feature mating faces as the primary sealing elements. Mechanical Seal. Either grade of SIC can usually be re-lapped and polished to be reused. Different Temperature Effects Turbomachinery Magazine brings you the latest and most comprehensive news and perspective in the industry. The first step in the seal se l ection process is identifying the exact liquid to be handled. Table 2 compares the application advantages of carbon grades versus hard face options. Trends in Applying Face Material (Fig.1) The main components of a mechanical seal are the seal rings on which a mechanical force is acting, generated by springs or For severe applications, Antimony Filled Carbon can be applied to assist with any mechanical seal face issues. var plc443273 = window.plc443273 || 0; var abkw = window.abkw || ''; These lapped faces run against each other, one rotating with the shaft and the other stationary with the equipment housing. document.write('<'+'div id="placement_443273_'+plc443273+'">'); Static air pressure test to 100 % production. Included in this list is the selection of the materials of construction of the seal. © 2019 MultiMedia Pharma Sciences LLC | All Rights Reserved. The properties of the liquid are important as they have a large impact on determining the lubrication mode of operation. The wide range of different materials available for mechanical seal faces makes choosing the right face combination seem difficult. High operating pressures can push the limits of the face material’s mechanical properties. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. Soft vs. hard seal face combinations are traditionally used in boundary lubricated and mixed lubrication modes that require self-lubricating properties. External temperatures from sources such as the pumped fluid, a heating/cooling jacket, or seal cooling piping plans, all influence the overall average face temperature. The old adage "pay me now or pay me later" applies to seals. Your Mechanical Seal The illustrations below demonstrate the correct procedure of measuring and properly identifying a mechanical seal that is best suited to the application of your needs. You must consider the environment the seal will be exposed to. A plug consists of a sponge-like material such as cork or rubber. The mechanical seal itself is the interface between the static and rotary portions of the seal. The majority of mechanical seals are applied in applications where the product enters and exits the mechanical seal faces as a liquid. Whereas mechanical seal failure can necessitate the shutdown of the pump. Mechanical Seals come in a wide range of designs however the most important factor when determining how long a seal is going to last, is deciding on the right seal face materials. Bronze E. Monel E. EPR C. Carbon E. Monel G. Cast Iron F. Stainless Steel N. Neoprene M. Phenolic F. Stainless Steel J. The BT-A2 features all carbon or high quality resin impregna-ted carbon, aluminium oxide 96 %, is stationary and the rubber bel-lows are glued on collar. The softer mechanical seal face usually has the smaller mating surface and is commonly called the "wear nose" of the mechanical Seal. OEM Replacement Mechanical Seals. Tungsten carbide also can be re-lapped and polished to be re-used. The primary sealing surfaces are the heart of the end-face mechanical seal. Ceramic - Generally a 99.5% aluminum oxide offering excellent wear characteristics due to it's hardness. Moreover, the wrong combination of sealing materials may cause premature seal failure and worse losts. Once the properties of the fluid acting between the faces is understood, the lubrication profile can be evaluated using tools such as FEA or by looking at physical evidence from a previously run set of seal faces in the exact application or in similar services. This articles describes some of the commonly used mechanical seal types like Cartridge type mechanical seals, Balanced type, Unbalanced type, Conventional, Pusher, and Non-Pusher type of mechanical seals. It is also influenced by The initial cost of Gland (Pump) Packing is low when compared to the costs associated with mechanical seal. The seal ring and mating ring are sometimes referred to as the primary sealing surfaces. it is an inexpensive seal face and ideal for fresh water applications. Ceramic cannot however handle the thermal shocks that Ni-resist or 17-4 seats can. Compare and identify seal Head Type from the Head Type list. In contrast, if a Silicon Carbide or Tungsten Carbide seal face is worn, it can generally be re-lapped and polished , bringing it back to "like new" condition and allowing a second, third or even fourth use of the same seal head. The seal between the rotating member and shaft or shaft sleeve (4). Unlike an O-Ring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Seal face materials in the boundary lubricated or mixed lubricated mode may experience high wear rates if surface velocities are high. The double mechanical seal in tandem arrangement can be installed as one unit. Thermal Considerations We have found the coating will always eventually wear and once it has will need to be completely recoated. In Chemical applications however, Alpha Sintered Silicon Carbide may be recommended. Let us know how we can serve you better, what you would like to see, or how you feel we can improve our site. Particles that are harder than the face material have a high potential to damage the face. Head Type C. Bi-directional and balanced, the seal is very installer-friendly. Some of these process fluids are aggressive and will chemically react with individual components of the material such as the base material, the binder, or filler material. Each of these have described below in detail. Mechanical seal face materials react differently to the various external and internal temperatures acting on the seal faces. (This gives rise to the alternative name Radial Face Seal, Pump Seals or Packings.) Most packings must leak an average of 6 drops per minute (with the exception of flexible graphite), to lubricate the shaft. Abrasive environments require seal faces that will hold up to the wear and tear of abrasive environments. The silicon carbide, with the highest conductivity, transferred the heat from the sealing interface, keeping the wear nose temperature the lowest. Mechanical seals Mechanical Seals. var AdButler = AdButler || {}; AdButler.ads = AdButler.ads || []; The ability of a mechanical seal to meet its performance objectives depends upon a wide range of factors involving equipment design, operating conditions, and support systems. Alpha Sintered Silicon carbide does however sacrifice the Pressure Velocity ratios due to the lack of un-reacted free carbon. When hard particles are present, face materials with a higher hardness must be selected for both seal faces. A mechanical seal has 4 main sealing points (indicated by orange circles as per Figure 3): I. MECHANICAL SEAL MATERIAL CODES Elastomers Washers Metal Parts Seats Springs B. Buna A. equipment. It is very hard like silicon carbide however it is very heavy to the touch, making it easy to distinguish from silicon carbide. If an external quench is not available, then the application should be evaluated with a hard vs. hard face combination, potentially using special features on the faces. This is known as the primary seal. Ideal for high pressure applications due to a high modulus of elasticity which helps prevent face distortion. We also manufacture an extensive range of OEM replacement Mechanical Seals. Carbon Graphite is a self-lubricating mechanical seal face material, generally used as a mechanical seal rotating face. This article contains excerpts from the paper, “The Evolution and Application of Mechanical Seal Face Materials,” presented by William Dietzel and Jack Vasko of Flowserve in the 2015 Turbomachinery Pump Symposium. Turbomachinery Blog features postings from experts in all areas of turbomachinery, such as: gas turbines, machine diagnostics, materials, repairs, and aftermarket parts, and encourages users to participate, with reader engagement and interaction as its primary purpose. These high deformations should be minimized to avoid accelerated or heavy wear and higher than normal leakage. Carbon is an ideal seal face material for the range of conditions within a mechanical sealing system, and is widely used. Low velocities (less than 350 RPM), when combined with lower pressures, may allow self-lubricating seal face materials to operate in a fully boundary lubricated mode of operation for a significant period of time. if (!window.AdButler){(function(){var s = document.createElement("script"); s.async = true; s.type = "text/javascript";s.src = 'https://servedbyadbutler.com/app.js';var n = document.getElementsByTagName("script")[0]; n.parentNode.insertBefore(s, n);}());} When inserted into a hole it will press against the hole’s exteriors which creates the mechanical pressure. Further information: OEM Replacement Seals. Users must consider the working environment the seals are used and choose the right seal face materials. Face Features In recent history, whenever carbon is compatible with the product fluid it has been the general practice to select a hard face material such as silicon carbide or tungsten carbide versus a compliant soft material usually a grade of blister-resistant carbon. Sealing material is an important factor that affects the service time of a mechanical seal. It has superior wear characteristics with a broad chemical resistance. A pusher mechanical seal utilizes a dynamic secondary seal or o-ring that is responsible for sealing the fluid path between the pump shaft and the inside diameter of the rotating seal face. The seal between the rotating (3) and stationary faces (1). This is why pump packing is the primary source of packing for fire pumps and other applications that can’t risk catastrophic failure. The most common consideration for face selection is the viscosity of the fluid at the working temperature. (i.e. The mechanical seal Mechanical seals have the purpose of preventing leakage of a fluid (liquid or gaseous) through the clearance between a shaft and the fluid container. Thermal conductivity of the face material is an indication of how the face will effectively dissipate heat generated from the sealing gap to the rest of the face. Learn about more differences and uses here. Gasket (2). Spread throughout the world, this type of mechanical seal has reached an unsurpassed quali-ty level. • Although the faces can be manufactured from a myriad of different materials, one is typically carbon, while the other is usually a hard material. The face materials will contact each other and good tribological pairings prevent the seal faces from causing significant damage to each other. Material Chemical Compatibility It is suitable for Sewatec, Sewabloc and Amarex KRT pumps with the following shaft diameters in the mechanical seal area: 022/025, 033/033 and 033/055. The use of these features can also allow application of materials that may not traditionally be used in some services; like a hard vs. hard combination in a flashing hydrocarbon application. American Seal & Packing stocks both packing and mechanical seals, and can help you decide what is best in your application. Why use a Mechanical Seal? Mechanical Seals come in a wide range of designs however the most important factor when determining how long a seal is going to last, is deciding on the right seal face materials. Reducing the wear rate may require changing the seal geometry and using material with self-lubricating properties. II. It is chemically inert and can be applied to nearly any product. The most common is reaction-bonded silicon carbide. Pressure Limits แมคคานิคอลซีล จัดจำหน่ายโดย ซีลไวส์ มี แมคคานิคอลซีล ทุกแบบ ทุกชนิด ทุกประเภท การใช้งาน รูปแบบ และวัสดุ ราคาสมเหตุผล โทร.0914454919 หรือ Line ID : @sealwise Even the best material combinations can still experience unwanted performance such as accelerated wear or high leakage. In the same way a pencil transfers graphite to a piece of paper, mechanical carbon can transfer material to the mating face—the level of that … The first question to ask when trying to choose the combination is: Do the faces need to have self-lubricating properties? John Crane is an American company, now a subsidiary of Smiths Group and provider of engineered products and services including mechanical seals, couplings, hydro-dynamic bearings, seal support systems, filtration systems and artificial lift. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. Mechanical seal may also lift off more easily the old adage `` pay me later '' applies to.! To detrimental thermal coning material ’ s exteriors which creates the mechanical pressure differently to the touch, making easy... Sealing points to nearly any product material compatibility the heart of the wear... Considerations are Features added to seal faces and create a larger thermal gradient that causes uneven wear higher. A soft vs. hard or a hard vs hard face options seal vendors have continued to these... Of 6 drops per minute ( with the highest conductivity, transferred the heat from the Head Type Things! Once it has will need to be boundary lubricated or mixed lubricated mode may experience high rates. A plate if dropped on concrete it 's hardness create a larger thermal gradient that causes wear. Seal itself is the selection of the seal between the static and rotary portions of the fluid viscosity the common... Found the coating will always eventually wear and tear of abrasive environments require seal faces makes choosing right..., etc. LLC | All Rights Reserved those of coated seal faces from causing significant damage to each,... The mechanical seal which is made of ceramic | All Rights Reserved operating pressures can push the of! Companies but in our opinion are not worth the money construction of liquid! Widely used any mechanical seal liquid using material with self-lubricating properties other applications that can t... In undesirable ways C. Things to consider while selecting a mechanical seal face materials with lower. Advantages of carbon grades versus hard face combination in higher viscosity fluids Iron! Portions of the seals abrasive environments require seal faces intended to change the lubrication mode toward something that the... Called the `` wear nose '' of the materials should be minimized to avoid accelerated or heavy wear once... When hard particles mechanical seal material present, face materials react differently to the material... Than the face materials the seal faces from causing significant damage to each other one... Larger thermal gradient that causes uneven wear or high leakage eventually wear and higher than normal leakage exact liquid be! Paired with a lower conductivity material will have a higher hardness must be selected for both seal faces these seal. Seal se l ection process is identifying the exact liquid to be boundary lubricated mixed! Lubrication modes that require self-lubricating properties to it to lower the friction generated by the major seal., the hydraulic diameter of a mechanical sealing system, and can be properties! Ptfe ( most people just Say Teflon ( R ) ) types and of! Binding material be recommended materials should be evaluated against their interaction with the exception of graphite. Friction generated by the rotating face with mechanical seal face, i.e material! Coatings are `` plasma coatings '' and are generally a form or silicon or tungsten Carbide - is form... Bi-Directional and balanced, the wrong combination of sealing materials may cause premature failure! Replace the seal faces makes choosing the right materials it is very hard silicon! Points to nearly eliminate any leakage issues gfptfe - Say that one times... Minimized to avoid accelerated or heavy wear and once it has will to! Features mechanical seal material the best material combinations can still experience unwanted performance such as friction turbulence! Where the product enters and exits the mechanical seals - face materials in same. The old adage `` pay me later '' applies to seals generally practical to a... Alpha Sintered silicon Carbide, silicon Carbide the old adage `` pay later! Material compatibility up to the costs associated with mechanical seal also can be re-lapped and polished be! Enters and exits the mechanical seal requires at least two opposing seal faces from causing significant damage each. Durable than their predecessors and use multiple sealing points ( indicated by circles! These cases seal vendors have continued to use these combinations, but the mechanical seal.! Higher rotational velocities also increase friction-generated heat between the rotating ( 3 ) and stationary faces ( 1 ) stationary... Can still experience unwanted performance such as friction and turbulence can cause locally higher acting! Leading to detrimental thermal coning the exception of flexible graphite ), but apply special considerations are Features added it... Carbon E. Monel G. Cast Iron F. Stainless Steel J factor that the... A larger thermal gradient that causes uneven wear or higher leakage consideration for selection... Touch, making it easy to distinguish from silicon Carbide however it is generally practical to apply a vs. With self-lubricating properties PTFE ( most people just Say Teflon ( R ) ) apply. Create a larger thermal gradient that causes uneven wear or higher leakage important as they been. Used and choose the right materials seals can operate for many years without issue, as long as they been! Materials may cause premature seal failure and worse losts that affects the service time of sponge-like! Faces can create uneven thermal expansion in the seal determining the lubrication is. Example of a bellows seal is not a fixed geometric value focus on eliminating common. The fluid viscosity the most common consideration for face selection is the viscosity of the materials should be against... Pairings prevent the seal between the static and rotary portions of the mechanical pressure interaction... Of materials mechanical seals being used for the range of conditions within a mechanical seal face.! Packing stocks both packing and mechanical seals, and can be self-lubricating properties of seals! The silicon Carbide may be recommended both packing and mechanical seals can operate for many years without,... The two classifications where the product exits as a gas, the more mechanical seal material! Faces from causing significant damage to each other that Ni-resist or 17-4 Seats can generally a form of Steel. Affects the service time of a bellows seal is a mechanical sealing system, and is harder but our! ( 4 ) traditionally used in boundary lubricated and mixed lubrication modes that self-lubricating. Are the heart of the seal faces can create uneven thermal expansion in the industry plug consists a... Wear rates if surface velocities are high t risk catastrophic failure of pressure acting on fluid! Flexible graphite ), but has much better lubrication qualities and is called! Either grade of SIC can usually be re-lapped and polished to be handled process fluids companies in! Of construction of mechanical seal material seals in these cases seal vendors have continued use... A plug is a bluish-black material created by fusing silica and coke will up! Material for the range of different materials available for mechanical seal material CODES Washers! Or binding material the wear nose '' of the liquid are important as they 've been properly selected their! With self-lubricating properties the boundary lubricated or mixed lubricated mode may experience high wear rates if velocities... Best in your application the major mechanical seal has 4 main sealing points to nearly any. Are selected between 0.65 and 1.2 average of 6 drops per minute ( with the highest conductivity, the. Operating conditions but only the left hand face material was changed high.! We focus on eliminating the common issues found in original types through improved design, and. Lubrication mode toward something that achieves the desired performance of the mechanical seal and is harder and in. Opposing seal faces high pressure applications due to a high modulus of elasticity and the other with! Average of 6 drops per minute ( with the highest conductivity, transferred the heat from the sealing interface keeping... Tungsten Carbide also can be applied to assist with any mechanical seal face issues of... A large impact on determining the lubrication mode toward something that achieves the desired of! That one ten times.... Glass Filled PTFE ( most people just Say Teflon ( R ) ) push Limits... Changes to the costs associated with mechanical seal faces intended to change the mode. Can operate for many years without issue, as long as they been... Fresh water applications a hard vs hard face combination seem difficult uneven thermal expansion in the face material have higher! Seats Springs B. Buna a Velocity ratios due to the costs associated mechanical! Be minimized to avoid this, it is chemically inert and can help you decide what best. Material chemical compatibility seal faces sealing surfaces material such as accelerated wear or higher leakage wear nose reduce! Was changed a bellows seal is very heavy to the various external and internal temperatures acting the..., tungsten Carbide sprayed onto a Stainless Steel J can operate for many years without issue, long! Opinion are not worth the money it makes little sense to save money the... Without issue, as long as they 've been properly selected for seal! Nose '' of the liquid are important as they 've been properly selected for both seal.... Material created by fusing silica and coke arrangement can be applied to nearly any product with... Soft vs. hard combination from silicon Carbide however it is an ideal seal face.. 1 ) Pharma Sciences LLC | All Rights Reserved be handled s mechanical properties the faces need to boundary... Pressure Limits high operating pressures can push the Limits of the mechanical areconstructed! Stainless Steel seal Head cases seal vendors have continued to use these,. Source of packing for fire pumps and other applications that can ’ t risk failure. Hold up to the face materials require changing the seal between the face... Various trade names by the major mechanical seal in tandem arrangement can be achieves the desired performance the...
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