Why Use Safety Valves? Introduction to Safety Valves


05 March 2022


Safety Valves

A safety valve is one of the important mechanical devices used in several industrial applications to protect systems from overpressure. Excess pressure build-up in the system can cause explosions, fires, and damages to critical components and products.

Safety valves are designed to stop these problems by reducing or removing excess pressure from the system. They are specially designed to be actuated by the fluid being controlled; hence, it works when pneumatic or electronic safety controls fail.

Below, we have covered more about safety valves: types, working principles, applications, selection criteria, and everything in between.

Safety Valve Working Principle

Safety Valve Working Principle

The general working mechanism of safety is simple. When the pressure of a system exceeds the maximum allowable working pressure (MWAP), safety valves quickly open to remove the excess pressure before it even builds up. These valves are fast-acting, and they open fully until the system pressure comes back to normal.

Most safety valves have a smaller inlet port and a larger discharge outlet. This ensures that any overpressure can be quickly corrected without damaging the sensitive machine parts. The detailed working principle of safety valves from opening to closing depends on the design and application of the valve. We’ve highlighted more on this below.

Types of Safety Valves and Use Cases

Types of Safety Valves and Use Cases

There are three main types of safety valves. These are:

  • Spring-loaded safety valves
  • Pilot-operated safety valves
  • Safety valves with balanced bellows

a. Spring-loaded Safety Valves

This is one of the most common types where the valve is held closed by a spring, and the balance between the input force and the spring force determines the closing and opening of the valve.

Most spring-loaded valves used in everyday applications come with a flat poppet valve, but those designed for specific liquids and gases come with varying valve shapes. Some even come with a lifting chamber that provides more lift, reducing the time it takes to eliminate the excess pressure in a system.

Spring-loaded valves for vapor and gases often open before the MWAP is reached, and the valve is lifted at least 50% at the MWAP.

The problem with this type is increased backpressure that interferes with the safety of the valve. Backpressure is defined as the pressure that builds upon the outlet of the safety valve as the fluid medium flows out. Most spring-loaded valves are available for pressure ranges between 1 bar and 1400 bar.

Figure 2: (A) Expansion chamber, (B) Spring, (C) Disc, (D) Nozzle ring (E) Nozzle.

b. Valves with Balanced Bellows

This type of safety valve comes with metallic bellows that increase the poppet valve’s surface area. The benefit to this is reduced backpressure hence more safe operation. The spring mechanism is also isolated from the fluid media; thus, there’s no undesirable influence on the spring force. That said, most valves with balanced bellows are designed to handle backpressure not exceeding 16 bar.

c. Pilot-operated Safety Valves

A pilot-operated safety valve has its popper valve held onto the nozzle by the inlet pressure, helping avoid leaks or undesired openings. When the inlet pressure is lower than the maximum working pressure, the safety valve will always remain open.

However, as soon as the inlet pressure goes beyond the response pressure, the valves open instantly, allowing the media to flow and reducing the pressure. As soon as the pressure comes back to normal, the valve closes.

All three types of safety valves find applications in different industrial settings. Some of the common areas where safety valves are used include oil and gas, manufacturing, food processing plants, refineries, pressure booster systems, and more.

Choosing a Safety Valve

Choosing a Safety Valve

Before picking a safety valve in the flooded market, you should always consider the following:

  • The response pressure or the maximum allowable working pressure.
  • The backpressure at which the valve can operate without causing safety issues.
  • The discharge capacity of the safety valve.
  • The valve’s operating temperature.
  • Valve and sealing material.

Besides the above factors, you should also check the certifications required for your specific industry. For instance, safety valves used in the oil and gas industry will vary significantly from those used in the beverage and food industry. Some of the common certifications and standards in the market include ASME, TUV, and ISO 4126.


A safety valve is an important mechanical device that helps solve the problems associated with overpressure. There are three main types of safety valves: spring-loaded valves, pilot-operated valves, and those with balanced bellows.

When the inlet pressure is higher than the maximum allowable working pressure, safety valves open up to avoid pressure build-up. This, in turn, avoids damages, fires, explosions, and injuries.

The right choice of safety valve will largely depend on your unique needs. Some of the critical factors to consider are response pressure, operating temperature, seal and valve material, discharge capacity, and backpressure. You may also want to do thorough research before choosing a safety valve from a given manufacturer.

For instance, check the manufacturer’s reputation, warranty, industry experience, customer reviews, etc.

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Big Data Capable Of Predicting The Next Best-Selling Book And Author

Is Big Data Capable Of Predicting The Next Best-Selling Book And Author: An Analysis

The applications of data in various fields are becoming more relevant than ever. From sports to music, the applications of data and technology are finding new uses, applications, and results. If you have seen the Brad Pitt baseball movie, ‘Moneyball’, you would know exactly what I am talking about. Many argue that the applications of big data cannot apply to creative fields like music or writing. However, experts who are getting big data analytics certification think otherwise. Books, people point out cannot be judged according to big data. In other words, whether a specific book will become successful is a creative function that is dependent on experience, expertise, and audience reception. Not quite so! It appears that scientists and data practitioners have come up with a method to analyze and understand whether a book can become a best-seller or not. How does the Big Data Algorithm work? In the last few years, experts like Jodie Archer and Matthew Jockers have analyzed the last 30 years of New York Times bestsellers. They have then applied scientifically and tech-developed algorithms to look at various trends, patterns, and learnings to figure out what is common in all these books. The results are striking. Bestseller-Ometer, the algorithm has data fed into it from more than 20000 books and novels. For publishers, this comes as a welcome advancement. They do not need to take a risk call on every manuscript that passes through their doors. They can easily just run the software and figure out which novel is going to work and which is not going to sell. If you are looking at percentages of success, the makers are confident of 80%! That is a huge percentage to take into consideration at any given point in time. Is this a Reality that is going to change the Publishing World forever? To be honest, the application of the data is not the first in terms of the idea. This was first assessed and put into work in the jewelry industry. Inkitt, a German-based start-up was the first to look at the various inputs and reading perceptions of the readers and come up with an algorithm that assesses what is liked and what is not. The algorithm takes into account, the following factors- What is the rate of repetition of the pages that the readers go over? How long do they dwell on a specific section? Are there any thematic points that are considered more? Where are the books purchased and read from? Once all these inputs are fed into the software, the algorithm runs its course and gives out suggestions, and shows definite patterns. The Human Factor- Can this be Completely Discounted? Both Jockers and Archer feel that even though the algorithm is great, it is not 100% thanks to the human factor. You might ask what is this factor? This factor is called the human intimacy factor. It refers to the emotional and intimate bond that forms between a book’s characters and the reader. Think about Harry Potter novels and how they have become a household name for everyone of this generation. It also means that new genres, one that has still not been discovered are subject to the human emotional connection and chance. An algorithm can only assess data that is in front of it. If there is something completely new and unique, the algorithm will not be able to give a cohesive reading of the same. In such cases, editors need to depend on their experience to understand whether the said work can be successful or not. The Bottom Line: Big data analytics is changing the creative and arts industry in a major way. As more research and developments take place, it is only a matter of time before we see more full-proof connections emerge in this industry. Read Also: YouTubNow: An Honest Review in 2021 CustomEssayOrder – Custom Writing Service Review Want an Amazing Photobook? Choose Mixbook

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