centrifugal pump mechanical seal made in china

MINKIX is a professional mechanical seal company that provides all kinds of inventory mechanical shaft seals for pumps, along with the same-day dispatch, and assures the aftermarket of higher quality, precision and performance.

We pride ourselves on being the in-stock supplier of mechanical seals that uses ERP to manage inventory. By doing so we are ensuring our clients are getting the right mechanical seals in the fastest manner possible.

With years of commitment to manufacturing quality seals and providing an excellent customer service, MINKIX is growing and gaining reputation and trust among wholesalers, distributors, and repair businesses.

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These devices preserve the integrity of the centrifugal pump systems by preventing fluid leaks and keeping contaminants out. Mechanical seal systems are used on various seal designs to detect leakage, control the seal environment and lubricate secondary seals.

Mechanical Seal ( centrifugal pump) , also known as end face sealing, dynamic sealing for rotation, excellent working performance, no leakage, long span life,long maintenance, automatic production, and suit for high temperature, low temperature, High pressure, vacuum, high speed, various types of corrosive substances, solid-containing grains, etc. Machines used in the sword.

1. ) Auxiliary mechanical sealing ring made of silicon carbide, high temperature rubber and other special materials enables the mechanical seal to withstand the high temperature of 300°C.

Centrifugal pump is a combination of rotating parts (such as shaft, impeller, shaft sleeve, etc.) and stationary parts (such as pump shell, stuffing box, bearing box). Space or clearance needs to be left between the rotating part and the stationary part to avoid wear of mechanical parts. Through the clearance, the pressure fluid in the pump housing may leak to the surrounding atmospheric environment. Traditionally, gland ropes or packing are used to seal the gap. O-rings, gaskets / plates and airfoil seals are used to seal stationary parts, so these are called static seals. Labyrinth seals, lip seals and mechanical seals are used to seal the rotating shaft, so they are called dynamic seals. After World War II, the sealing rope was replaced by mechanical seal. Mechanical seals are also called face seals.

Mechanical seal is a key component in centrifugal pump. It prevents the leakage of pressure fluid by friction between moving ring and stationary ring with very smooth contact surface.

The above typical mechanical seal has five different sealing points (see Figure 2) to prevent the leakage of pressure fluid into the surrounding atmospheric environment.

The seal is located between the impeller, shaft and shaft sleeve, as shown in Figure 2, and the gasket is sealed. It prevents fluid from leaking through the gap between the shaft and the shaft sleeve (see Figure 3). It is the seal of the rotating impeller to the rotating shaft and shaft sleeve. There is no relative movement between parts during operation. The arrow in Figure 3 indicates the possible leakage path if the seal (gasket) fails.

The seal is located between the floating ring and the shaft sleeve, as shown in Figure 2, i.e. O-ring. It prevents fluid leakage through the gap between the floating ring (rotating part of the main seal) and the shaft sleeve, as shown in Figure 4. The seal rotates relative to the rotating part. During operation, the shaft sleeve and O-ring move relatively. The arrow in Figure 4 indicates the possible leakage path if the seal fails.

The rotating part and the stationary part are sealed by the rotation (mutual friction) of the floating ring relative to the stationary ring. Due to the spring force (the spring has a preload of 2 mm to 3 mm) and hydraulic load (the fluid pressure acting on the sealing surface), the floating ring and the stationary environmental protection remain in place. The seal rotates relative to the stationary part seal. The arrow in Figure 5 indicates the possible leakage path if the seal fails.

3) Adapt to the axial thermal expansion of the sealing ring. The heat generated by the contact between the sealing surfaces may lead to the thermal expansion of the sealing ring.

The seal is located between the stuffing box and the gland (gasket), which is a static seal. The arrow in Figure 6 indicates the possible leakage path if the sealing gasket fails

The seal is located between the stationary ring and the sealing gland, which is a static seal. The arrow in Figure 7 indicates the possible leakage path if the sealing gasket fails.

A mechanical seal is any device that utilizes two ring type seal faces running against each other to create a barrier to the leaking product liquid. These two seal faces are ground and polished so smooth that they can run with a very small clearance between them, and even occasionally touch momentarily without damaging one another. The mechanical seal uses the product liquid to cool and lubricate the seal faces to keep them undamaged, with small amounts of vapor escaping across the faces. For liquids that are abrasive and non-lubricating, a “barrier fluid” may be required to protect the seal faces from the product.

The simplest mechanical seal consists of one “stationary face” that attaches to the exterior of the pump and does not rotate, and one “rotating face” that attaches to the spinning shaft. Each of these faces must attach to the pump via flexible “boots”, O-rings or other means to prevent liquid from leaking out around the seal faces. These boots are typically made of an elastomer such as rubber (BUNA), EPR or Viton, but the boots can be flexible metal bellows or even Teflon (although Teflon is difficult to install and keep compressed).

A vast majority of centrifugal pumps will pump water in some varied condition, possibly in combination with an antifreeze and some antibacterial additives. Since water by itself is not a very good lubricant (especially at high temperatures) the seal faces need to provide some lubricity of their own so that when they touch at startup or shutdown, the faces will not tear themselves up. This is usually accomplished by making one of the seal faces out of carbon or by some material impregnated with carbon. The other seal face is usually a harder material that will resist wear from the carbon face, such as a ceramic, carbide or solid metal.

Note that although water is the most common liquid pumped, the different additives used can make a huge difference in the type of seal required. Relatively clean water, even when combined with glycol, is easy and inexpensive to seal, whereas dirty water or water with lots of additives can be very difficult. The difference is in the abrasiveness and lubricity of the liquid. If when you rub a sample between your fingers you can feel the lack of lubricity, or if your liquid has lots of salts or other dissolved solids, you may need a more complicated and expensive mechanical seal.

Water that is not abrasive and may have some glycol can use the least expensive type of seal. The stationary seal face is usually made of ceramic and is sealed to the seal plate with a Buna boot or a Buna O-ring. The rotating seal face is usually made of carbon/graphite in some combination and is sealed to the shaft (or shaft sleeve) with a Buna boot or O-ring. The spring and metal parts needed to hold the seal together are 304SS or 316SS.

Water with any salts, abrasives or additives are much harder on mechanical seal faces. When the mechanical seal is operating properly, small amounts of liquid are entering the space between the two faces. As the liquid travels from the high pressure side of the faces to the low pressure side, the liquid heats up and vaporizes. While this vaporization is needed to cool and lubricate the faces, it also leaves any salts or other solids in the space between the seal faces. These deposited solids are very abrasive and will accumulate over time and may quickly erode the faces (particularly the softer carbon face).

The simplest and cheapest solution for mildly abrasive liquids is to upgrade the seal faces to materials that can resist abrasives better than the inexpensive carbon/ceramic combination used for clean liquids. The least expensive harder material is usually silicon carbide, but other ceramic/metals are used. The downside of silicon carbide or any other hard material occurs when they run dry, even momentarily during startup and shutdown. Any period of dry running can cause wear and heat buildup and may cause the mechanical seal to fail. (In severe cases, the heat will melt the elastomeric parts). This dry running problem is significantly reduced when the silicon carbide faces are impregnated with carbon/graphite, but the problem is not eliminated. Depending on many variables, the seal with impregnated faces can only run dry for a short time before failing, but eventually the seal will fail from heat buildup.

Other solutions for sealing abrasive liquids include flushing the seal faces with a clean liquid, but this option requires special seals (such as a double seal) and special flushing piping. The cost of this option gets expensive fast and may require a much larger, more expensive pump and seal combination.

As water temperature gets lower than 32 F or higher than 212 F, the seal materials may need to be upgraded. Low temperatures usually need EPR elastomers to handle the cold, and higher temperatures may need Viton. Extreme temperatures may also require that the standard ceramic be replaced with the much tougher silicon carbide or other metal faces. Ceramic faces are very susceptible to thermal shock, and a sudden change in the temperature of the liquid can shatter the seal faces.

Mechanical seals for sanitary pumps or for use in food processing will usually require Viton elastomers and 316SS metal parts plus any other material upgrades needed for the liquid being pumped. These seals usually must be outside the pump where they can be disassembled and cleaned daily, so specialized pumps and seals are needed.

Liquids other than water may require very specialized mechanical seals, and even very specialized pumps. Toxic or flammable liquids will require double seals, special flushing liquids and special flushing plans to isolate the liquids and protect the seal faces. These special seals are often required for protecting workers, the public and the air quality. The size and complexity of these special seals requires large chambers and often large, complicated and expensive pumps. You may need to consult with your pump salesman or an experienced mechanical seal salesman to get the right pump and the right mechanical seal.

If your liquid is very hard to seal or very dangerous, you may want to consider a “sealless” pump. The three most common types of sealless pumps are: Mag Drive Pumps, Canned Rotor Pumps and Vertical Cantilever Pumps.

A Mag Drive Pump uses magnets to drive the pump in a contained shell. One set of Magnets spins on an outside cylinder attached to the motor. Another set of magnets spins on an inside cylinder attached to the pump. The two sets of magnets are separated by a thin non-metallic shell that keeps the pump liquid inside the shell. The problem with this arrangement is that there are lots of bushings and sleeves needed to support the pump shaft and the impeller. These bushings and sleeves are exposed to the pumped liquid, so any abrasives can kill the pump quickly. Repairing or replacing these bushings and sleeves is very difficult and very expensive, and only adds to the cost of an already expensive pump. This pump is very useful for clean but dangerous liquids.

A Canned Rotor Pumps goes one step farther than a Mag Drive Pump by enclosing the whole pump and motor inside a sealed shell. This eliminates the need for magnets to drive the pump and uses fewer bearings/bushings than the Mag Drive Pump. These bushings and sleeves are exposed to the pumped liquid, so any abrasives can kill the pump quickly. The repair and replacement of the bushings and sleeves is very expensive. This pump can be the best option for some hot and dangerous liquids.

A Vertical Cantilever Pump is usually the best option for water with lots of abrasives (such as parts washers). A motor is specially designed and built to have a very long and often very large diameter shaft that extends out (cantilevered) as long as is needed for the pump design. This long motor shaft is supported solely by the motor ball bearings (or by a large bearing housing) and these bearings are not exposed to the pumped liquid. A throttle bushing and sleeve are needed to reduce the amount of water escaping from the pump and these parts are exposed to the liquid, but the bushing and the sleeve should never touch and can be made from hard, erosion resistant materials. The disadvantage of this pump is that it is mounted vertically and must hang into a sump, so a lot of space and additional support structure is required. There are limits to the length these pumps can be made as the diameter of the shaft goes up exponentially as the length of the shaft increases. There is also some lost efficiency as some liquid must leak past the sleeve and bushing.

Guangzhou Bugeman Mechanical Seal Co., Ltd. is a comprehensive and professional sealing company integrating design, development, production, sales and service. It is located in the southern part of mainland China—Guangzhou, with superior geographical location, well-developed transportation, and product services throughout In China’s east, west, south and north, its brands have been well-known in ...

Lepu Seal is a professional mechanical seals supplier & mechanical seals manufacturers mainly producing all kinds of China mechanical seals, bellow seals, cartridge seals, and seal rings. Customers can find different China mechanical seals for pumps, such as O-ring mechanical seals, PTFE mechanical seals, Flygt mechanical seals, Elastomer bellow mechanical seals, single spring mechanical seals, and Alfa Laval mechanical seal. All our products have passed related certification including SGS, CE, and UL.

It is also known as a face seal, which is a rotary machine shaft seal device that can avoid the leakage of the fluid. It is widely used for the rotation of the shaft seal, for pumps, kettle, compressor, and other similar equipment. There are a lot of materials for manufacturing the mechanical seals, including rubber, stainless steel, PTFE, carbon, ceramic, Sic and TC.

Mechanical seals are usually made by moving rings, stationary rings, compression elements and sealing elements. The operating principle is that the movable ring rotates together with the pump shaft, and the movable ring and the static ring are tightly bonded to form a sealing surface to avoid leakage of the medium. Considering the actual situation that mechanical seal running with other components of the pump together, Lepu Seal will perform strict tests for ensuring the function and technical requirements of the mechanical seals so that they can play an effective role in maximizing the value. They can be used in many applications. For example, our mechanical seals can be widely used in the field of chemistry, the oil and gas industry, the pulp and paper industry and the marine industry. What"s more, in the petrochemical and pharmaceutical industries, customers also can find the usage of our mechanical seals.

[en] Centrifugal pumps are widely used in nuclear power and civil engineering projects. However, the selection, installation and usage of mechanical seals always cause abnormal leaking issue. This essay briefly introduces the classifications and structures of mechanical seals used for centrifugal pumps. The factors that would affect the selection of mechanical seal, which include the following: a. working parameters such as medium pressu re, temperature, diameter of axle and rotate speed; b. medium characters such as concentration, viscosity and corrosivity etc.; c. requirements for specific work; d. auxiliary system for mechanical seal; d. examples, have been described in details and analyzed. Calculations and verifications have been made to mechanical seals. The research depicted in this essay can be taken as reference for selection of mechanical seals for centrifugal pumps applied in following nuclear power plants. (author)