Pest Solutions Prevention

Pest Solutions are methods used to prevent or eliminate pest infestations. They can range from simple outdoor recipes to sophisticated microbe-based solutions engineered from bacteria.

There was a time when pest control involved using harsh chemicals to eliminate the problem. Today, there are a variety of green pest solutions that exterminators can use without posing a risk to people or pets. Click the https://www.apexpestky.com/ to learn more.

One of the best ways to prevent pests from infesting a home or business is to keep it clean. Pests are attracted to dirty areas, food sources and water. Keeping things clean can help deter many different types of pests, including rodents, cockroaches, ants, fleas and mosquitoes. Cleaning up crumbs, wiping down counters and floors, and vacuuming carpets can make a home less attractive to pests.

It is important to scout the area regularly to look for places where pests may lay eggs or have shelter. A good place to start is by examining the outside of a home, looking under leaves, along foundation walls and at bait stations. Also, look inside the house for places where pests can hide. For example, store clothes and linens in sealed containers to protect them from moths or use screens on windows to deny access to the interior of a home.

Changing the environment to reduce the amount of available food and shelter can also help prevent pests. This can be done by eliminating trash piles, increasing the frequency of garbage pickup, and storing garbage in closed containers. It is also important to avoid putting out pet food, milk, and other products that attract pests.

There are also things that can be done to change the environment to make it less favorable for pests, such as altering temperature and moisture levels. This can be accomplished by constructing barriers, using lights and other forms of energy, and controlling soil conditions.

Sometimes, the seriousness and scope of a pest problem will call for the use of a pesticide. In these cases, a pest control technician will choose a chemical that poses the least risk to people and pets, while still being effective against the pest in question. This is called integrated pest management (IPM). When the correct steps are taken in prevention, suppression and detection, the need for pesticides should be reduced. However, if the need arises, always follow environmental guidelines when applying any type of pesticide. This will ensure that the least possible harm is done to the environment and to people.

Suppression

Pest infestations are a nuisance, causing damage to property and health risks from droppings and gnawing. When left unchecked, pests can be a big problem for commercial and residential properties. These pests can destroy buildings, create fire hazards and contaminate food supplies.

The most common pest control solution is the use of chemicals to eliminate existing infestations and prevent future ones. However, there are many green alternatives to this type of treatment. For example, neem oil, peppermint oil, boric acid and vinegar can all be used to repel pests and stop them from entering your home or business. Many of these are also easily available from your local hardware or home improvement store.

A microbial pesticide, like the bacteria bacillus thuringiensis (better known as Bt), is another popular form of eco-friendly pest control. These bacteria are naturally occurring in soil and have been developed into strains that target specific insects. While effective, they have the added benefit of being safer for people and the environment than traditional chemical pesticides.

Threshold-based decision-making refers to a pest management technique that relies on scouting and monitoring, rather than preemptively taking action when a pest is detected. For example, a single wasp sighting may not warrant action, but a wasp colony should be monitored and if found, the nest should be located and destroyed. In some cases, thresholds can be crossed and a more aggressive approach to pest control may be required.

While prevention is the preferred method of pest control, there are times when it is simply not possible. The severity of the pest problem and the conducive conditions may necessitate the use of a more drastic measure. The chosen pesticide should always be one that poses the least risk to people, pets and the environment and is used with utmost discretion.

Green pest solutions are becoming more prevalent among high-quality professional pest control companies. If you want to learn more about how to keep pests out of your home or business, contact Attention Pest Solutions today. Our team is Commercial Applicator Certified and experienced in all facets of residential and commercial pest control.

Detection

Most pests invade buildings through cracks, crevices and holes in the structure. In addition, they enter through doors and windows that aren’t properly sealed. They can also sneak in through unsecured crawlspaces. Some pests come inside looking for shelter from cold weather, while others seek food.

When stored product pests, like flour and grain beetles, moths and weevils, infest food items, they can quickly spread throughout the facility. Infestation is often not detected until the presence of webbing on container surfaces, a musty odor or visible signs of pest activity, like gnats and fleas. Detection is crucial, and should include careful examination of food products including pet foods, dried flowers and foliage, potpourri, rice, bird seed, spices, candy and chocolates. It is also important to examine holiday decorations for signs of pests.

Detection can be achieved through monitoring the presence of pests using sticky traps, pheromone or light traps. Monitoring areas where food is being stored can also be accomplished by placing a pheromone-based tracking powder along the floorboards where pests are likely to roam. Organizing shelves and cabinets so that they are easy to inspect can help decrease the labor costs of a detection program. Clear lines of sight on floors also help reduce the time and effort needed to inspect.

Eliminating entry points is another way to prevent pests from entering a museum establishment. Inspecting new and existing windows, doors and floorboards for gaps, cracks or signs of rodent activity can be a good place to start. Adding weather stripping to doors and caulking around windows can go a long way toward denting the number of pests that can enter a home or building.

Pests can also enter a home through unsecured vents, chimneys and roof vents. Regular cleaning and repairing these areas can eliminate the insects that enter through them. Keeping woodpiles away from the foundation of buildings and removing debris can help stop pests from nesting in these areas as well. Similarly, keeping grass trimmed and not having overgrown shrubbery can reduce the chances of rodents living in it and coming into houses.

Treatment

Pests are organisms that affect human activities, crops and food supplies, spoil property, damage or spread disease, and disrupt natural ecosystems. Pest control is the process of managing or eliminating those unwanted organisms. Pest control measures include prevention, suppression and treatment. Pests can be rodents, birds, insects or weeds. Some of the most common pests include cockroaches, ants, bees, wasps, termites and mosquitoes.

The best way to avoid infestations is preventative pest control services. These services focus on keeping properties free of pests, both inside and out. This includes regular yard maintenance to remove any invasive plants and removing trash on a regular basis. It also includes fixing any leaky pipes and addressing high moisture areas to prevent pest breeding grounds.

Clutter can provide places for pests to hide or breed, so it’s important to keep the house and office clean and organized. Remove stacks of newspapers and magazines, vacuum and sweep regularly, and store foods in tightly-fitting containers. This can help to minimize pantry pests like drugstore beetles, flour beetles, grain beetles and Indian meal moths as well as flies and fruit flies.

If preventative measures aren’t enough, there may be times when a pest control company will need to resort to more aggressive methods of treatment. This can involve the use of pesticides or baits to eliminate pests that have already begun to breed or invade property. This is usually done by a professional pest control technician and is always discussed with the customer first.

Some chemical pesticides are more harmful than others, so pest control technicians should always try to use the least-toxic method of eradication. This is why it’s often better to let a professional do the job, as they can ensure that the right chemicals are used in the appropriate places and at the correct dosages to keep people, pets and the environment safe. Some green pest solutions are becoming more common and are considered safer than traditional pesticides. These include nematodes and microbial pesticides. The most well-known type of microbial pesticide is Bacillus thuringiensis, which has been developed into strains that target specific types of pests.

Link Juice – How Much Link Juice is Passed to a Page?

Link Juice is the power that a website has, influencing SEO rankings. Various tactics have been developed for acquiring and distributing Link Juice to websites. The most effective strategies are content marketing and relationship building.

Creating informative, authoritative content positions you as an authority in your industry and attracts natural backlinks. Participating regularly in industry forums also helps build your credibility and boosts SEO rankings.

Link building, also known as link equity, is one of the key factors that determine rankings within search engine results pages (SERPs). Boosting your page’s SERP ranking is an essential goal of any SEO campaign. By focusing on the quality of your backlinks and optimizing internal linking, you can create powerful networks of links that will help your page rank higher. There are a number of different ways to build a strong link network, including acquiring links from relevant websites, guest blogging, and relationship building.

When a website links to yours, it is essentially vouching for your content. The more authoritative the site is, the more link equity it passes on to your page. This is why it’s important to focus on acquiring links from high-quality, relevant sites.

It’s important to note that the amount of link juice a page receives depends on its link profile, which includes both Dofollow and Nofollow links. Dofollow links generally have more value than Nofollow links, and you should strive to acquire dofollow links from authority sites in your niche. Linking to authority sites will help you increase your own domain’s authority, which in turn can lead to better search engine results.

The location of the link: Links in a footer or sidebar don’t get as much weight as those in the body of a post. Linking to the homepage of a site can also provide more juice than linking to an individual page.

Keywords: Incorporating relevant keywords in the title and text of a page can enhance its rank. It’s also beneficial to include LSI keywords and target phrases. However, it’s important to remember that over-using keywords can decrease a page’s ranking.

Using the correct keyword density is essential for optimizing your internal link structure. It’s also recommended to avoid over-using “click here” or other clickbait titles, which can have a negative impact on your ranking. You should also aim to have a balanced link structure, with some links that direct visitors to the homepage and others that direct visitors to specific landing pages. Finally, it’s important to consider how old a domain is, as this can influence the amount of link equity that it passes on to your page.

Anchor text

The anchor text of a hyperlink is the clickable text that is used to link to another page on your website. It is important to use descriptive anchor texts that are relevant to the target page’s content. Using keyword-rich anchor text can help generate more powerful link juice and improve overall SEO performance. However, you should avoid over-optimized keyword strings as they can look spammy to search engines. Instead, try to use synonyms or latent semantic keywords (LSI) when possible.

In addition to the anchor text, the linking page’s overall authority also plays a role in how much link juice is passed to a target page. The more authoritative the linking page, the more valuable the link. Additionally, the number of links on a referring page can influence how much link juice is passed to each one. This is because the linking page’s domain authority is divided among the number of outgoing links on the referring page.

Lastly, the relevance of the link to the target page is also important. For example, a link from a site that specializes in the topic of your blog will likely carry more weight than a link from a general website. The same applies for links from blogs and other websites that review specific products or services. These types of links are more valuable because they can attract qualified traffic that is interested in the product or service being reviewed.

While link juice is an important factor in determining a webpage’s ranking on search engine results pages, it’s important to understand how this ranking works. To begin, it’s important to understand that a page’s rank is determined by how many other pages on the web reference it. Then, Google takes that information into account when determining the ranking of a particular page. As a result, it is critical to build a strong network of high-quality backlinks in order to increase your page’s ranking. There are a few different ways to do this, including creating relevant content and participating in guest blogging. In addition to these strategies, you can also use internal linking to distribute link juice throughout your website.

Dofollow or nofollow

The link juice is a portion of a page’s ranking that is transferred to a linked page. The amount of link juice that is passed depends on a number of factors, including the authority of the source page and the number of outbound links on the page. The more authoritative the source page, the more link juice is passed to the destination page. The amount of link juice that is transferred also depends on how close the destination site is to the source page. This is why it is important to have a diverse link building strategy and to focus on creating valuable content.

Using the right anchor text is one of the best ways to increase your Link Juice. Using keyword rich and descriptive anchor text can help search engines understand the context of your link, and thus will pass more Link Juice to your linked pages. The position of the link in a text also plays an important role. Generally, more Link Juice is passed to links that are higher up in the text than those that are deeper within the article.

Another way to increase your Link Juice is by linking out to high-quality websites. Ideally, you should try to link out to websites with a similar niche as your own. For example, if your website is about technology, you can link to blogs or other sites that review specific technologies. Similarly, if your website is about travel, you can link out to blogs or other sites that review specific destinations. This will help your site to rank well in the SERPs for these related keywords, and it will also improve your reputation among your audience.

While some SEOs have argued that nofollow links do not pass any link juice, the truth is that they may still offer some value. In fact, according to Google’s Matt Cutts, nofollow links may actually help you if the link is from a high-quality website. However, it is important to avoid linking to low-quality or irrelevant content.

It is also worth noting that shortened URLs and URL shorteners do not count as links for purposes of Link Juice. Moreover, the use of 301 redirects may negatively impact your SEO rankings, so it is important to use them sparingly.

Internal structure

The internal structure of a website can influence how much Link Juice is passed to a particular page. In general, pages that are linked from other sites of high authority will receive more link juice than those that are not. This is because links from high-authority pages are considered more valuable by search engines, and they help improve the rank of the page they connect to.

In addition, the number of links on a page can affect how much Link Juice is passed. The more links on a page, the less likely it is that a single page will receive the full amount of Link Juice. For this reason, it is recommended to include fewer links in each page. In addition, the quality of the links can also affect how much Link Juice is passed. It is better to have a few good links than many poor ones.

The way Link Juice is distributed depends on several factors, including the number of links on a page, the quality of the links, and the relevance of the content on both sites. Additionally, the type of domain is important, as.gov and.edu sites are considered more authoritative than other types of websites. The PageRank of the linking site is another important factor, as it is a measure of the overall ranking of the site.

Despite the fact that Google no longer offers a toolbar to show PageRank, SEO tools such as Ahrefs and Moz still give users a glimpse into the amount of Link Juice a page has. These tools allow users to identify which pages on a site are receiving the most Link Juice and which pages should be prioritized.

One of the best ways to increase your Link Juice is to create high-quality content that is relevant and informative. You can also reach out to other authoritative websites in your niche and build relationships with them. This will also increase your Link Juice, as it will be shared with other websites that have similar topics. In addition, it is important to keep in mind that Google’s algorithms are constantly changing. As a result, strategies that worked in the past may no longer be effective in the future.

How to Properly Prepare Your Home for Carpet Cleaning

Carpets trap dust and dirt particles that harm our health, especially if our homes have kids or pets. Keeping up with regular cleaning can help prevent these problems and prolong the life of our rugs.

Always treat stains as soon as they happen, blotting (not rubbing) them. The longer stain materials remain, the greater the chance of permanent color change or odor damage. Contact Carpet Cleaning El Dorado Hills CA now!

Carpet acts like a filter for many airborne pollutants, such as pet dander, dust, bacteria, mold spores, and other allergens. These particles stick to the fibers and are released back into the air when people walk on the floor, making regular deep cleaning essential for health. The best way to keep your carpet clean is to vacuum it regularly, especially with a vacuum cleaner that has a HEPA filter. However, even with frequent vacuuming, routine cleaning is needed to eliminate deep dirt and stains.

A professional carpet cleaning service can use powerful steamers to penetrate and loosen ingrained dirt and oil-based stains. They also provide deodorizing treatments to remove unpleasant odors from the flooring. Regular cleaning of your carpeting can restore the color and help it look more faithful to its original shade.

Other household carpet cleaning methods aren’t as effective. Vacuuming alone won’t get rid of dirt that’s deeply embedded within the fibers, and these methods may even make stains worse. They’re better used as supplements to the more thorough cleaning methods accepted by the industry.

One of the most commonly used professional carpet cleaning methods is hot water extraction, or steam cleaning. In this process, a special chemical is applied to the carpet before the steam is generated by a high-powered machine that injects the chemical into the carpet. The hot steam liquefies the deposited dirt, killing any bugs and odor-causing organisms. Then the loosened dirt is extracted with clean water, leaving no residue or odors.

Another popular method is shampooing. This involves the application of specialty detergents with lots of water, similar to shampooing hair. A rotating brush is then used to scrub the carpet, and a machine extracts the shampoo along with the dissolved dirt. Shampooing is effective, but it doesn’t produce the same level of cleanliness as steam cleaning. Plus, shampoo residue can collect and attract dirt, causing the carpet to become dirtier faster than it was before the cleaning. This is why it’s best to use truck-mounted hot water extraction for the most effective results.

Preparation

Getting your carpets professionally cleaned is a great way to remove deep-seated dirt and stains, leaving you with fresh-looking, healthy carpeting. However, proper preparation is vital for the cleaning process to be effective. There are a number of easy things you can do to prepare your home for professional carpet cleaners, and these simple steps will make the cleaning process go much more smoothly.

Vacuuming the area before the carpet cleaner arrives is an important first step. This will help to remove loose dirt particles, allowing the cleaners to focus on the deep-seated dirt. It is also a good idea to identify problem areas of the room and point them out to the cleaners, as this will allow them to give those areas extra attention.

Next, you should pick up any full-length draperies that touch the floor and pin them up or reposition them so that they are at least six inches off of the ground. This will protect them from moisture and any heavy cleaning equipment that may be used during the cleaning process. It is a good idea to do the same for any upholstered furniture with skirts that touch the floor. It is also a good idea to move any breakable items from the area to be cleaned. This includes things like knick-knacks, delicate decorations, and any fragile heirlooms that you may have on display. If you have a particularly fragile item that cannot be moved, be sure to let the cleaners know and ask them to use extra caution when moving around it.

A basic carpet cleaning process involves using a rotating buffer with an absorbent covering that is sprayed with a mist of cleaning solution and then rubbed over the entire area of the carpet. As the covering is rubbed, it works to pull up dirt from the carpet, which is then vacuumed away. This method is typically faster and more thorough than other methods, but it can leave your carpets with a slightly damp smell for a few hours afterward.

During this time, it is a good idea to open windows and use fans for increased ventilation in the room. This will help to remove the excess moisture and prevent mold and mildew from forming in the room. It is also a good idea to wait until your carpets are completely dry before replacing any furniture or walking on them.

Removal

When your carpet is clean, it’s important to protect it from future dirt and stains. Vacuum it at least once a week (more often if you have a lot of foot traffic) to keep dirt from being ground in and trapped in the fibers. Regular vacuuming also helps to extend the life of your carpet by preventing it from becoming worn and soiled.

When vacuuming, be sure to use a rotating brush attachment. These are more effective than suction only attachments. After you vacuum, turn up the heat to 75 degrees if possible. Warm air evaporates moisture more effectively and helps the carpet dry faster. You should also crack open your windows to allow the humidity in your home to escape.

Carpets are typically held down during installation with tack strips that have small nails sticking out of them to hold the carpet in place. These need to be removed before removing the old carpet. A crowbar and a hammer are required for removal (a flat head screwdriver works as well if a crowbar is unavailable). Wearing gloves is strongly recommended to avoid scratching or damaging the floor underneath.

After you remove the old carpet, you’ll need to inspect the space for signs of mold or mildew growth. Dark spots or musty odors are indicative of these problems and should be treated immediately.

Once you’ve cleaned the space, it’s time to install your new carpet. You’ll need to move your furniture back into place after the carpet is completely dry. Moving heavy furniture back on wet carpet can dent and discolor the fibers. It’s recommended that you wait 24 hours for this step, but your technician can give you a better idea of when it will be safe to replace the furniture. You should also vacuum the area again once your carpet is back in place to help prevent dirt from being pushed deep into the fibers. This will keep the color and style of your carpet looking vibrant. You should also rotate your furniture every few months to ensure even wear and reduce the chance of permanent stains or rust marks from metal legs.

Drying

After carpets are cleaned it’s important to let them dry as much as possible. This will prevent the formation of mildew, mold and other microorganisms that can have serious health consequences for occupants of a building. It will also help to reduce odors and give the carpet a clean, fresh appearance.

There are a few different methods for drying carpets, the most common of which is vacuuming. This helps to remove as much water as possible and is usually sufficient for most homes. In more severe cases, you may need to use a dehumidifier and/or a fan to help the process along.

Another way to dry a carpet is by using towels. This method involves spreading a large towel over the wet carpet and walking over it to help with absorption. You can then repeat this as necessary until the carpet is completely dry. This is especially effective in the case of small areas where a spill or other accident occurred.

You can also use fans to promote airflow in the room and help the carpet dry faster. This is particularly helpful when it’s humid outside or in the case of a rainy day that makes it difficult to open windows.

If you have a dryer that can be used on carpet, this is a great option for reducing drying times. However, it is important to remember that some cleaning solutions can leave behind soapy residue on the carpet that attracts dirt and dust particles while it’s damp, causing them to become permanently affixed when the carpet dries.

Another method for reducing drying time is to use a carpet grooming brush and absorbent compound after the traditional cleaning. This will help to suck up any remaining moisture, as well as reducing odors and minimizing the chance of mold or mildew.

Another popular method for shortening the drying time of a carpet is encapsulation. In this process, a machine applies a liquid or foam cleaning agent to the carpet that is then brushed over the carpet. The agent clings to the dirt and debris, creating a powder that can then be vacuumed up. This can cut drying times by as much as 50%, although it is not recommended for heavily stained or heavily soiled carpets.

How to Become a Plumber

Plumbing is a demanding career that requires a lot of hard work and dedication. However, it can also be a very rewarding career for those who are willing to put in the time and effort to become a plumber.

Plumber

Plumber Aurora CO installs, repairs, and maintains plumbing systems in residential and commercial settings. They also interpret blueprints and ensure that plumbing projects meet local building codes and regulations.

Test cocks, also called valves, are an essential part of backflow testing. They are used to identify the type of backflow preventer assembly and its overall function and direction of water flow. They are numbered and attached to the backflow assembly. Testers are required to follow specific tests and procedures when examining the valves and reading the gauges. Test cocks can also be used to flush out the body of the backflow preventer during a maintenance or repair service.

For example, a double check assembly (DCV) consists of an input shut off valve; two independently working spring-loaded, check valves; and four test cocks. During backflow testing, each of these test cocks is opened and closed to verify that both of the check valves are functioning properly. This will help to prevent backflow leakage and ensure that the city’s water supply remains safe.

The test cocks are located on the inlet and outlet of each of the two check valves. They are also found on the relief valve diaphragm and upstream of the upstream and downstream shut off valves. It is important to flush the cocks before and after pressurizing your test kit to make sure no dirt or debris is introduced into the gauge, which could affect its accuracy. To avoid this, you can use a special tool called the Test Cock Wrench that fits perfectly with Deringer and Magnum devices.

Pressure gauges

During backflow testing, pressure gauges monitor the pressure of water and air in tanks and systems. If the pressure differs from what it should be, the plumber will note the difference and take the appropriate action to correct the problem. Pressure gauges are very important for backflow testing because they allow the tester to verify that check valves prevent backflow, air ports open when they should and relief valves open before the pressure builds too high. This allows the tester to verify that all parts of a system are functioning as they should and that any errors in the testing are due to equipment malfunction or human error rather than a backflow issue.

A pressure gauge consists of a flexible measuring element, an indicator and a case. The measuring element is an elastic tube that moves in response to a change in pressure. This movement is translated into a rotary motion that drives the pointer and scale face of the gauge so we can read the reading. Currently, there are three different types of elastic elements used in mechanical pressure gauges: diaphragms, bellows and transducers. The type of gauge that best meets the needs of a particular application depends on the operating conditions, installation environment and desired accuracy.

The indicators of pressure gauges are either directly connected to the movement of the elastic element or indirectly connected via a range spring. Those that are directly connected (as in the bellow design) cause the needle on the scale to move immediately in response to a pressure change. The range spring in a diaphragm gauge, on the other hand, causes the needle to move linearly in proportion to the differences between two pressures.

Finally, the case of a pressure gauge is designed to protect the sensitive components inside. The most common cases are made of thermoplastic, aluminum or stainless steel. Some models offer an internal pressure relief plug feature that vents the case in the event of a pressure overload.

Whether to choose an analog or digital display, a solid front gauge or open front gauge and the size of the dial are other features that need to be considered when choosing a pressure gauge. The location of the threaded mount and how it will be mounted also dictates the gauge’s use. For example, if the gauge is going to be used in an area where it may be hard to see, then a larger dial might be a good choice.

Check valves

Check valves are a vital part of piping systems that provide a cost-effective solution to basic backflow prevention. They are easy to install and operate, and can be used in a variety of applications and working conditions. However, their performance can be compromised by improper selection and installation. This is why it’s important for plumbers to understand the basics of check valve design and function.

There are many different types of check valves, but they all operate the same way: a movable component allows flow in one direction and blocks it in the opposite direction. Depending on the style, this movable component can be a disc, plate, ball, or hinged element. The most common type is the swing check valve, which uses a hinged disc that opens when pressure increases and stays open when the system pressure decreases. Other types include the lift, wafer, center guided, and dual plate check valves.

The main reason for installing check valves is to prevent back siphonage, which can occur when a non-potable source of water enters the public water supply through the spout of a municipal backflow preventer. This can cause contamination of the potable water supply and result in expensive clean-up costs.

To avoid this, the city has installed hundreds of new check valves on water pipes in high-rise buildings and other vulnerable locations. These valves are designed to stop the leaking of non-potable water from fire hydrants and other sources.

Check valves are also effective in preventing water hammer, which can damage piping and equipment. This condition occurs when a fast change in velocity causes a sudden closure of a valve or other obstruction. The resulting pulses in the fluid cause a large increase in pressure that can damage pipes and equipment.

To avoid this, plumbers should use a non-slam check valve alongside an end damper to reduce the pressure changes caused by the closing of a valve. They should also ensure that the valve is at least 10 pipe diameters upstream of the point where it will be located. This distance will allow a nice laminar flow through the valve and help to prevent premature wear.

Relief valves

When a backflow preventer’s pressure drops or when the check valve fails, the relief valve is there to keep the system from overpressure. The relief valve can be set to open at a pressure lower than the system’s maximum operating pressure. The set pressure is determined by determining the system size and flow rate. It is important to install the correct type and size of relief valve to handle the system’s expected load.

The design of the pressure-relief valve depends on the application and can include different configurations of internal parts to withstand different pressure ranges. Many codes and standards around the world address the design of pressure relief valves. The most widely recognized is the ASME Boiler and Pressure Vessel Code. It is important to select and install the right pressure-relief valve for a backflow preventer installation.

There are several things that can cause a relief valve to fail to reseat. One is a reduction in the water supply side pressure caused by an outage or by a high demand from activities such as fire fighting. The other is a failure of the second check valve due to a leak, which allows the higher pressure from the customer side to go past the failing second check valve and act on the relief valve diaphragm. This causes the relief valve to open and discharge.

Another reason is the overpressure of the piping upstream of the valve, which can cause the relief valve to rapidly cycle, or chirp, in response to the pressure loss. This occurs when the pressure at the relief valve inlet decreases during the flow below the reseat point, then quickly rises to the reseat point once the flow stops. This rapid cycling can also occur when the reseat point is too high.

To reduce the chance of overpressure in critical process applications, it is common practice to install two relief valves. They are typically piped in parallel and have “car sealed” full-port ball or gate block valves on the inlet and outlet of each valve. These block valves are car sealed to keep them open when the relief valve is in operation and closed when the valve is removed for maintenance. Another option is to use an ASME-approved selector valve, which simplifies the operation of the relief valve and eliminates the need for a car seal when the valve is in service.