back to back mechanical seal for sale

A double mechanical seal is a type of mechanical seal withtwo primary seals or sets of faces, it can operate in various arrangements with a) a barrier (containment) between the sets of faces or b) a buffer (mixing).

2. A Double Mechanical Seal (Barrier) – Wet => is a double seal where the barrier fluid is a liquid. It is generally the most robust seal. It has a good pressure, speed and temperature capabilities.

If you have any query around how to install double mechanical seals for agitators or mixers or have some concerns around the seal failures, why not contact one of our mechanical seal specialists below to discuss it in more detail and find out how we can help solve your issues and get your process back up and running reliably again.

A dry gas seal is a revolutionary way of sealing machines and protecting them from dust, moisture and other contaminants. A dry gas seal is a sealing device that uses pressurized gas to keep two surfaces from touching. The most common type of dry gas seal is the O-ring, which is used in many applications, including mechanical seals, piston rings, and gaskets. Dry gas seals are also used in many other industries, such as the food and beverage industry, where they are used to seal containers and prevent contamination. This type of seal not only helps to keep the machine running with maximum efficiency but also significantly reduce downtime, making it cost-effective in the long run. In this article, we"ll explore what a dry gas seal is, how it works and why you should consider using it for your machinery. By understanding the benefits of a dry gas seal and its uses, you can make an informed decision about the best sealing system for your needs. How does a dry gas seal work?Dry gas seals work by using a series of labyrinths to separate the high pressure seal gas from the atmosphere. The labyrinths are formed by a series of grooves and ridges on the surface of the seal ring. The seal ring is rotated at high speed, causing the gas to flow through the labyrinths. The gas is then forced through an aperture in the center of the seal ring, where it escapes into the atmosphere. What is a dry gas seal used for?Dry gas seals are used on rotating equipment to help minimize the leakage of high pressure gases from the inside of the machinery. This helps to reduce maintenance costs and improve safety. Dry gas seals are commonly used in applications such as pumps, compressors, turbines, and blowers. Advantages of a dry gas sealThere are many advantages of a dry gas mechanical seal. One advantage is that they are much simpler in design than other types of seals, making them more reliable and easier to maintain. Additionally, dry gas seals do not require the use of any lubricating fluids, which can leak or evaporate over time. This makes them more environmentally friendly and cost-effective in the long run. Finally, dry gas seals have a much longer lifespan than other types of seals, meaning that they need to be replaced less often.Disadvantages of a dry gas sealThere are several disadvantages of dry gas seals, including: - they can be expensive to purchase and install- they require careful maintenance and regular inspection- they can be susceptible to wear and tear- they can leak if not maintained properlyHow to choose the right dry gas seal for your applicationThere are a few key factors to consider when choosing the right dry gas mechanical seal for your application. The most important factor is the type of fluid being sealed. Gas seals are designed to seal either liquids or gases, but not both. Make sure to choose a gas seal that is compatible with the fluid you are sealing.Another important factor to consider is the pressure of the fluid being sealed. Gas seals are rated for different maximum pressures, so make sure to choose one that can handle the pressure of your application.Finally, take into account the size and shape of the sealing surfaces. Gas seals come in a variety of sizes and shapes to fit different applications, so make sure to choose one that will fit your needs.ConclusionDry gas seals are an extremely important component for many industrial operations, and their ability to prevent leaks has made them invaluable in a variety of applications. Understanding the basics of how dry gas mechanical seal work and how they can be used effectively is helpful when considering the various options available for any specific application. With the right choice, dry gas seals can provide reliable, leak-free performance which will save time, money and resources while ensuring safety and reliability. Lepu dry gas seal manufacturer provides best quality flowserve dry gas seal and dry gas seal. Welcome to contact us!

In Part 2, we’re taking a closer look at the various rotary and stationary double seal arrangement options (configurations), and how to maximize their success.

A double seal is designed with two primary seals. These seals often use two rotating seal faces and two stationary seal faces. A fluid is provided between these two seals at a lower pressure than the sealed fluid (known as buffer fluid) or at a pressure higher than the sealed fluid (known as barrier fluid). The fluid provided to the dual seal allows the seal to survive in lethal, explosive, carcinogenic, hazardous, adhesive, or extremely viscous fluids.

A conventional double seal can be designed to seal the buffer or barrier fluid on the inside or outside diameter of the seal faces. Typically, the seal designer will place a softer, narrow face against a harder, wide seal face. The design intention is to enable the softer seal face to wear, while keeping the wider hard face from wearing in service. Once the narrow seal face has been worn away, the seal has reached the end of its suitable life.

Each configuration has its own strengths which are addressed below. Ultimately, it’s best to speak with a sealing specialist who can draw on a wealth of direct experience and implement according to your organizations’ expectations for reliability and environmental compliance.

In this double seal configuration, two narrow seal faces are mounted back-to-back (opposing) to one another. This is the original concept of a dual seal —taking two component mechanical seals and placing them ‘back-to-back’ within the stuffing box. This configuration is used in most general applications.

The unbalanced back-to-back mechanical seal requires a barrier fluid pressure of 15 psig higher than the seal chamber pressure. The barrier fluid is being pressurized above the seal chamber pressure, so the outboard seal faces are carrying the greater load and should wear out or fail first. When this happens, the barrier pressure will be lost, causing the inboard faces to open. In other words – if the seal works correctly, both seals will fail at the same time. This is not very good back-up protection.

If this seal is a double balanced design, the fluid between the inboard and outboard seal faces can be higher (barrier) or lower (buffer) pressure than the seal chamber pressure. This means that if the barrier/buffer fluid is lost, both seals will remain closed and operate reliably.

In back-to-back arrangement (both unbalanced and balanced seal designs), the outboard seal faces almost always are rated for a lower pressure than the inboard seal faces. This is because the outboard seal faces are an outside seal configuration and the faces are exposed to tensile force. Ceramics are generally weaker in tension than compression, so their pressure limit is lower.

If the inboard seal fails first, the barrier fluid will leak into the process which will cause product dilution. This product dilution sometimes is not desirable for products that can not tolerate it.

This configuration occurs when two sets of seal rings are identically orientated and mounted in-series. This configuration is often referred to as the “in-series seal face arrangement” or “face-to-back.”  It is commonly used in dual seals.

In this arrangement, the seals position the barrier or buffer pressure on the outside diameter of the outboard face. The pressure acts to compress the outboard seal faces. This allows a higher barrier fluid pressure.

Face-to-face seals can be used when the equipment is space constrained to accommodate a back-to-back or tandem seal arrangements. In this configuration a portion of the seal is mounted in the seal chamber and the remainder is mounted outside of the seal chamber.

For successful seal life and reliability it is very important to have the right seal arrangement along with the right barrier/buffer fluid system. In upcoming blogs, we will discuss various seal environmental control plans available for double seals and how to select the best barrier / buffer fluid for good seal life to achieve maximum reliability.

Antim Parikh is a Special OEM Projects & Applications Support Manager at A.W.CHESTERTON for mechanical seal product line. He manages the group of mechanical seal applications engineers and OEM platform products/projects.

Antim has worked for the A.W. Chesterton Company for the last six years in the Mechanical Seal product line as Lead Applications Engineer. He has provided support to all field salespeople and customers on product recommendation and troubleshooting. He has also conducted numerous mechanical seal training classes for customers and distributor’s specialists to provide assistance to training group.

Antim holds degrees in Master of Science in Mechanical Engineering (Fluid Power) from CT, USA and Bachelor of Science in Mechanical Engineering from India.

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