how does a mechanical seal work made in china

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Structural Features: double-end, multiple springs, with spring protector, balanced, independent direction of rotation, spring standing mechanical seal. The component is cartridge seal with easy installation. The springs are not touching the sealed mediums so that there will be no jam caused by the high viscosity and crystallization active content. This makes sure the flexibility of the compensation ring and as a result, it lasts the lifetime of the whole component. Multi spring structure makes the load on the sealing faces balanced. The seal needs to work with sealing water, which has the pressure of 0.1 - 0.3 MPa and flow rate of 3 - 8 L/min.

Scopes of Application: mainly used in chemical engineering, pulp production, pulp drying, pulp screening, and sewage treatment. Designed for pressure screens and other filters. This component can work as an alternative to ANDRITZ SafeMatic seal support system.

YALAN research and development center is located in city of Hefei, the captial of Anhui Province, China. It has 10 very experienced senior engineers working as a team for developing new mechanical seal solutions and provide technical support to the production factory of YALAN Seals.

The team has accomplished a total amount of over 3,600 models of mechanical seals and won 28 patents and invention. The search center of YALAN Seals is also named as one of the national high tech enterprises and provincial mechanical seal design and development technical center.

We supply a wide range of products made of different materials, including rubber, stainless steel, PTFE, carbon, ceramic, Sic, TC, etc. Also, our sealing spare parts are easy to interchange and maintain.

Supplier of, Actuators, Agitator Assembly, Air Regulator, Back Stop Clutch, Bearing Housing, Bearings, Blowers, Boards (Electronic), Boilers, Bursting Disc for RO membrane, Bushing HV and LV, Cards, Carrier Bridge, Cement Kiln, Cement Mil, Convertors, Conveyors, Couplings, Cranes,Crushers, Cylinders, Hydraulic, Pneumatic, Dampers, De ionizer, Debris filter with ball collector, Displays, Expansion Bellow, Fan, Blower, Filter Cleaning Controllers & Accessories, Filters, Elements, Cartages, Fuses, Gantry Cranes, Gauge Glass, Gauges, Gear Boxes, Gears, Header Tank Systems, Hot air industrial oven, Large Size Generators, Level Indicators, Load cells, Measurement, Pressure and Temperature, Mechanical Seal, Modules, Oil conservator, Pneumatic Controllers, Positioners, Power Supply,Pumps, Reducers, Relay, Repair Kits, Sample Cell

Scraper, Seals, Sensors, Shafts, Soft Starters, Stacker & Reclaimer, Surge Arrestors, Switches, Thermocouple, RTD, Thyristor, Transducers, Transformers, Transmitters, Turbines, Valves, Variable Frequency Drive

Large Size Motors, Carbon brushes, Carbon brush holders, Slip rings, Commutators, Diagnostics and Measuring equipment for motors and generators, Terminal blocks, AEGIS SGR - Shaft Grounding System

Continuous Gas Analyzers for Process & Emission Monitoring, Pulse Jet Valves, Dresser Nut Valves, Flanged Valves, Manifold Flat Mount Valves, Threaded Valves, Pilot Valves and Enclosures, Enclosures for Hazardous Locations, Enclosures for Non-Hazardous Locations, Hazardous Pilot PEX-PXA and Pilot Valves.

Ningbo Donglian Mechanical Seal Co.,Ltd./Ningbo Dongya Mechanical Seal Manufacturer(Dyseals),formed in 1992,is a National High-tech enterprise with Provincial Research and Development Center with advanced management: ERP systems and remote operation.A coverage of 32000 square meters and a building area of 28000 square meters,an existing Staff of over 300. Products: mechanical seals, mechanical seal rings, shafts and bushes/sleeves in ssic, sic, ceramic, tungsten carbide and carbon, bullet-proof plates and body armours in ssic, sic, ceramic and boron carbide. The ceramic plates which we researched and developed were successfully assembled in the space experiment room called Tiangong 2 in 2015.

Asinoseal, a manufacturer specialized in mechanical pump seal business, has always been making great efforts in design, produce, repair, doing on-site service for our customers inside and outside China. Our main product is agitator seals, cartridge seals, metal bellow seals, and any OEM mechanical seals. We have a strict QC procedure to make sure all seals from us are fully checked and qualified.

Like other products, China mechanical sealscan be designed and calculated, but some parameters cannot fully reflect the real sealing conditions due to the limitation of testing technology and mechanism research level. Therefore, in a sense, the mechanical seal is a relatively experimental technology. So some people think that the seal design is only regarded as an experimental technology, and in fact it cannot be as reliable as calculating the strength of bridges or sliding bearings. The difficulty lies in the lack of systematic information on sealing characteristics. For this reason, the test work of the mechanical seal shall be carried out in the following cases.

3.In some specific working conditions outside the scope of application of the product or if there are special requirements for sealing, tests should be carried out in order to evaluate the adaptability of the product.

4.The research on the mechanism of mechanical seals, through experimental research and theoretical analysis, guides the development of new structures and new materials, and improves the technical level of mechanical seals.

During the test, the test technique used is very important. Only by using a variety of advanced testing techniques can an accurate assessment of a product be made. Test technology is an important basis for the production of first-class products.

A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft.

When sealing a centrifugal pump, the challenge is to allow a rotating shaft to enter the ‘wet’ area of the pump, without allowing large volumes of pressurized fluid to escape.

To address this challenge there needs to be a seal between the shaft and the pump housing that can contain the pressure of the process being pumped and withstand the friction caused by the shaft rotating.

Before examining how mechanical seals function it is important to understand other methods of forming this seal. One such method still widely used is Gland Packing.

Packing needs to press against the shaft in order to reduce leakage – this means that the pump needs more drive power to turn the shaft, wasting energy.

The stationary part of the seal is fitted to the pump housing with a static seal –this may be sealed with an o-ring or gasket clamped between the stationary part and the pump housing.

The rotary portion of the seal is sealed onto the shaft usually with an O ring. This sealing point can also be regarded as static as this part of the seal rotates with the shaft.

One part of the seal, either to static or rotary portion, is always resiliently mounted and spring loaded to accommodate any small shaft deflections, shaft movement due to bearing tolerances and out-of-perpendicular alignment due to manufacturing tolerances.

The primary seal is essentially a spring loaded vertical bearing - consisting of two extremely flat faces, one fixed, one rotating, running against each other.  The seal faces are pushed together using a combination of hydraulic force from the sealed fluid and spring force from the seal design. In this way a seal is formed to prevent process leaking between the rotating (shaft) and stationary areas of the pump.

If the seal faces rotated against each other without some form of lubrication they would wear and quickly fail due to face friction and heat generation. For this reason some form of lubrication is required between the rotary and stationary seal face; this is known as the fluid film

In most mechanical seals the faces are kept lubricated by maintaining a thin film of fluid between the seal faces. This film can either come from the process fluid being pumped or from an external source.

The need for a fluid film between the faces presents a design challenge – allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself.

This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces.

The gap between the faces on a typical  seal is as little as 1 micron – 75 times narrower than a human hair.  Because the gap is so tiny, particles that would otherwise damage the seal faces are unable to enter, and the amount of liquid that leaks through this space is so small that it appears as vapor – around ½ a teaspoon a day on a typical application.

This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces (the fluid film) acts to push them apart.

Without the pressure pushing them apart the two seal faces would be in full contact, this is known as dry running and would lead to rapid seal failure.

Without the process pressure (and the force of the springs) pushing the faces together the seal faces would separate too far, and allow fluid to leak out.

Mechanical seal engineering focuses on increasing the longevity of the primary seal faces by ensuring a high quality of lubricating fluid, and by selecting appropriate seal face materials for the process being pumped.

When we talk about leakage we are referring to visible leakage of the seal. This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other. By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free. What we can say, however, is that unlike gland packing, the amount of leakage on a mechanical seal should be so low as to be visually undetectable.

Ningbo Donglian Mechanical Seal Co.,Ltd./Ningbo Dongya Mechanical Seal Manufacturer(Dyseals),formed in 1992,is a National High-tech enterprise with Provincial Research and Development Center with advanced management: ERP systems and remote operation.A coverage of 32000 square meters and a building area of 28000 square meters,an existing Staff of over 300. Products: mechanical seals, mechanical seal rings, shafts and bushes/sleeves in ssic, sic, ceramic, tungsten carbide and carbon, bullet-proof plates and body armours in ssic, sic, ceramic and boron carbide. The ceramic plates which we researched and developed were successfully assembled in the space experiment room called Tiangong 2 in 2015.

CHICAGO (23 Oct, 2014) -John Crane is making significant investments in its Tianjin, China manufacturing and customer service center to continue strengthening customer support capabilities. Investments have been made in manufacturing equipment, service center machines, customer and employee training facilities, and a new research and development (R&D) technology center to meet the growing demand from energy services customers in China.

John Crane has operated in China since 1986, giving local customers access to a wide variety of mechanical seals and aftermarket services. The latest investments are part of the company’s strategy to continue building infrastructure to support local customer demand across Asia and other targeted high-growth markets. Among the investments are:

In addition, the company is increasing gas seal capabilities at the Tianjin, China facility to give the local market access to gas seal engineering expertise, and manufacturing, service and repair capabilities.

Zhenning Mao, John Crane’s Vice President of China, said: "This is an exciting time for us. We’re investing in our China business at the highest levels in our history. Expanding our manufacturing capabilities means we can bring customers new products faster and with better quality. And with new machines in our service center, we’re able to offer customers new aftermarket services to improve reliability in their operations.

“The investments are testament to our growing workforce who are working hard to service our local customers. Our teams are also preparing to meet customer demands that will arise based on the forecast that China’s energy production will increase 60% over the next 20 years.”

John Crane www.johncrane.com is a global leader in engineered technology, supplying engineered products and services to energy services customers and other major process industries. The company designs and manufactures a variety of products including mechanical seals, couplings, bearings, filtration systems and artificial lift equipment. John Crane employs about 6,900 people and has more than 230 sales and service facilities in 50 countries. Fiscal year 2014 revenues were $1.5 billion. It is part of Smiths Group www.smiths.com, a global leader in applying advanced technologies for markets in threat and contraband detection, energy, medical devices, communications and engineered components.

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JY Mechanical seal (zhangjiagang )Co.,Ltd was established in 2006.With Jinyu trademark ,we Specialized in design and manufacturing repairing of Mechanical seals and selling high quality of sealing material silicon carbide, Tungsten carbide ,Tungsten Carbide,Alumina Ceramics carbon.

JY is constantly developing series of cartridge seals conforming to standard of ISO,ANSI,DIN and API ,which are widely used in industry such as Petrochemical ,electric power ,steel, pharmaceutical, paper &pulp, marine, ship yard and food processing Except for innovating on products research, engineers and technical well –trained by the company can customize various of mechanical seals as per requests, also can improve sealing performance on the working site and support maintaining solution.

Major for water pumps and circulation pumps Working Conditions: Pumps:Water pumps, circuation pumps,etc. Temperature:-20 o C~200 o C Pressure: ≤0.8Mpa Speed: ≤ 10 m/Sec Combined Materials: Stationary Ring(Carbon/SiC/TC) Rotary Ring(Ceramic/SiC/TC) Secondary Seal(NBR/EPDM/Viton) Spring and Punched Parts(Steel) O-Ring Mechanical Seals Type ST155 Equivalent to Vulcan Mechanical Seal Type 13 Single Face Unbalanced Seal Conical Spring Fixed Rotation Direction

You must consider the “environment” the seal will be exposed to when selecting the design, and importantly, the material of your mechanical seal. The saying “pay me now, or pay me later” very much applies to seals as not selecting the right material will cost more in the long run.

For all environments the material used for the seal face must be stable, be able to conduct heat, be chemically resistant and deliver good wear resistance. However, certain environments will need these properties to be stronger than in others.

Abrasive and harsh environments mean that the material selected must be able to withstand this, which can be more expensive. However the cost will be returned to you over time as poor material grade selection will only result in costly shut downs, repairs, refurbishments or replacements of the seals once again.

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.

Various materials can be used for seals depending on the requirements and environment they will be used for. By looking at material properties such as hardness, stiffness, thermal expansion, wear and chemical resistance, you are able to find the ideal material for your seal.

When mechanical seals first arrived, seal faces were often made from metals such as hardened steels, copper and bronze. Over the years, more exotic materials have been utilised for their property advantages, including ceramics and various grades of mechanical carbons.

Many early mechanical seal designs placed the spring inside the process fluid. Most products (process fluids) that are sealed are not very clean. When the spring mechanism of the mechanical seal is immersed in this unclean fluid, dirt collects between the springs. This situation eventually impacts the spring’s ability to respond to movements and vibrations, and the ability to keep the seal faces closed. Over time, clogging of the springs will cause premature seal failure.

The ideal design offers springs on the atmospheric side of the mechanical seals. The springs will be protected from the process fluid and their ability to work will not be impeded.

The pressure from both the seal springs (Ps) and the hydraulic pressure of the liquid in the pump (Pp) provide a compression force that keeps the seal faces closed. Balanced seals reduce the seal ring area (Ah) on which the hydraulic pressure of the liquid in the pump (Pp) acts.

By reducing the area, the net closing force is reduced. This allows for better lubrication that results in lower heat generation, face wear, and power consumption. Balanced seals typically have higher pressure ratings than unbalanced seals.

Mechanical seals can be designed with inserted seal faces or with monolithic seal faces. In both cases, the sacrificial seal face is often made from carbon/graphite. This material offers good running properties but is relatively weaker from a mechanical standpoint than other options. Inserted face designs use a metal rotary holder to transmit the shaft torque to the seal face.

The disadvantage of this inserted face design is that the face and holder material have different coefficients of thermal expansion. This changes the net interference force between both parts when they are exposed to heat from the process fluid or face friction. The seal face deforms, which results in leakage and accelerated wear.

More modern seals are equipped with monolithic seal faces that are made out of only the seal face material itself. The torque transmission is applied directly to the seal face. This is possible if the geometry of the seal face is designed in a particular shape to give it the strength to handle the torque through its geometric design. These monolithic seal face designs have been made possible through the use of Finite Element Analysis (computer modeling).

Monolithic seal faces provide a more stable fluid film between the faces, and they do not deform in operation compared to inserted faces (or to a much lesser degree). Therefore, they are more commonly used nowadays when reliability and low emissions are vital.

All mechanical seal designs have at least one secondary seal that interacts with the dynamic movement of theflexible mounted face. This secondary seal moves with the springs to keep the seal faces closed and is defined as thedynamic secondary seal. During operation of a rotary design, springs will keep the seal faces closed. They adjust with each rotation for any misalignment from installation and parts tolerances. As the springs compensate, the dynamic secondary seal moves back and forth, twice per revolution. This rapid movement prevents the protective chrome oxide layer (the layer that protects the metal) from forming. Erosion of this unprotected area under the dynamic secondary seal will cause a groove to develop. Eventually this groove becomes so deep that O-Ring compression is lost and the seal leaks. In most cases, fretted shafts must be replaced to achieve an effective seal.

With rotary mechanical seals, it is important that the stuffing box face is perpendicular to the shaft for the faces to stay closed. There will always be some resulting misalignment from installation and parts tolerances. The springs must adjust with each rotation to keep the seal faces closed. This adjustment becomes more difficult at higher speeds.

In contrast, a stationary seal is a mechanical seal designed in such a way that the springs do not rotate with the pump shaft; they remain stationary. Because the springs do not rotate, they are unaffected by rotational speed. The springs do not need to correct or adjust with each rotation; they adjust for misalignment only once when installed.

Rotary seals are simple in design which makes them inexpensive. They are suitable for lower speeds only. Stationary seals are more complicated to design but are suitable for all speed ranges. Because of design complexity, stationary seals are more commonly configured as cartridge seals rather than component seals.

Marco Hanzon is Vice President of Global Marketing for A.W. Chesterton Company. He has been an active member and past chairman of the Mechanical Seal Committee of the European Sealing Association. Marco"s experience includes working as an In-Field Support Engineer for mechanical seals.