Why Use Safety Valves? Introduction to Safety Valves

Published on: 05 March 2022 Last Updated on: 14 February 2025

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

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

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

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.

Summary

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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For Android: If you want to know how to call someone who blocked you on Android, follow the steps below: Open the “Settings” app. Select the “Additional Settings” option. Tap the “Caller ID” option. Choose the “Hide Number” option. 4. Change Your Phone Number Admittedly, this one's a bit extreme. Changing your phone number just to bypass a block is quite the hassle, involving updating contacts and contact information across the board. However, it's an option worth mentioning, even if it's not the most practical for a single phone call. Changing your phone number is relatively straightforward and usually free. Just call your service provider and request a new number. Keep in mind that once you change it, there's no turning back—you'll permanently lose access to your old number. How To Call Someone Who Has Blocked You On WhatsApp? In this age of digital communication, WhatsApp stands as one of the pillars of staying connected. But what happens when the digital door gets slammed in your face, and you find yourself blocked by someone you need to reach? Fear not, for we're about to embark on a journey to decode the mysteries of calling someone who has blocked you on WhatsApp. The Art Of WhatsApp Blocking First, let's decode what happens when you're blocked on WhatsApp. You'll notice a distinct lack of updates on their profile picture, a blank last-seen status, and no more read receipts for your messages. It's like they've vanished into the digital ether. But don't despair; there are ways to pierce this virtual veil. Try Sending A Message Believe it or not, sometimes a blocked contact can still receive your messages. They won't see them in real time, but the messages will be there waiting when they eventually unblock you. So, go ahead and craft that heartfelt message or apology, and press send. It's like sending a message in a digital bottle, waiting to wash up on their shore someday. 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So, whether you're seeking reconciliation or just trying to reconnect, don't let a blocked contact hold you back in the WhatsApp world. Things To Keep In Mind While You Try To Reconnect! Now, before you embark on your mission to reconnect, there are a few crucial considerations. Here are some of the things that you should keep in mind while you try to call someone who has blocked your number: 1. Think About Why They Blocked You: Remember that blocking doesn't typically happen by accident. The person who blocked you did so deliberately for a reason. Reflect on what led to this action and whether a call will genuinely resolve the issue. Surprising someone who blocked you might not yield the desired outcome. 2. Beware of Legal Ramifications: The Truth In Caller ID Act of 2009 made it illegal to use Caller ID spoofing technology to harm or defraud someone. Depending on how the person who blocked you feels, your attempts to contact them through unconventional means could be deemed harassment. Ensure that reaching out won't lead to legal trouble. 3. Consider Alternative Communication: While a phone call might be the most direct approach, it's not always the most effective or considerate one. Explore other avenues, such as asking a mutual friend to mediate, using social media or email, or even sending a heartfelt handwritten letter. These methods respect their need for space and provide them with something to ponder while maintaining a less intrusive approach. Wrapping It Up! Reconnecting with someone who's blocked your number may seem like a daunting task, but it's not impossible. You have several strategies at your disposal, each with its own set of pros and cons. However, before attempting any of these methods, it's wise to consider whether reaching out is genuinely in the best interest of all parties involved. Sometimes, the best course of action is to exercise patience and allow time to heal wounds, knowing that they can reach out when they're ready. After all, respect for their boundaries and feelings should be your top priority. In case you wanted to know how to call someone who blocked you, I hope that this blog has been of help to you. If there are any other queries related to the same, please feel free to let me know. All that you need to do is scroll down till you reach the bottom of the page. Then leave your comments and queries in the box below. And I will be there to answer them all for you! Learn More About: How To Delete A Page In Google Docs? What Data Does Google Analytics Prohibit Collecting? How To See Someone’s Imessages Without Their Phone?

Why Use Safety Valves? Introduction to Safety Valves

Safety Valve Working Principle