These devices rely on specific valves: check valves or two one-way valves. These valves get lined up in a series to prevent backflow from occurring. Think of it as a one-way door—once it’s gone out, there’s no other way for it to come back in. If any pressure coming back to the water main exceeds that of the route of flow, then the valves ...Backflow preventers are included in fire sprinkler systems to protect public health from contamination by preventing water flow back into the public water grid. In an opposite manner, the forward-flow test for backflow preventers was created to ensure the sprinkler system can be served by enough water in a fire condition. ...A backflow preventer is a device that prevents contaminants from entering a potable water source during a backflow event. Learn the types, functions, and installation of …Backflow Prevention Devices: Atmospheric Vacuum Breaker (Anti-Siphon) The atmospheric vacuum breaker is the simplest and least expensive backflow prevention device for one or two-zone anti-siphon irrigation systems. It is also the least reliable and least often recommended. Most large cities and suburbs do not allow the use of …Apr 28, 2020 · Backflow preventers vs. check valves: greater protection is needed for potable water supplies. Check valves are relied on to prevent backflow in a variety of applications, from HVAC systems to sump pumps to fire sprinkler systems with elevation changes. But when it comes to public health and safety, many water authorities and municipalities ... Best backflow preventers for sprinkler systems – Comparison table. Product Image. Backflow preventer. Febco 765-1” breaker. Zurn 720A Wilkins vacuum breaker. Homewerks worldwide pressure breaker. Hydrostatic testing pressure. 300 PSI. 300 PSI.Maintaining your Rain Bird sprinkler system is essential for keeping your lawn looking healthy and green. With proper care and maintenance, you can ensure that your sprinkler syste...Apr 8, 2021 ... The winter is over! Let's get the sprinklers going! Make sure you turn on your sprinklers correctly after winterizing for the winter.Are you tired of lugging your garden hose or sprinkler around to make sure all parts of your landscape are well watered? Sprinkler system installation is a big DIY project. If you ...To avoid this, follow the steps below to prepare your system for the cold: Turn off and drain water supply to the system. Drain water from the backflow preventer. Drain water from sprinkler pipes. Blow compressed air into the system to further clear the water. Insulate exposed pipes and properly set the valves.Why background checks alone are not enough. The National Rifle Association says the US needs to fix its flawed background check system to prevent deadly shootings as the one in Par...Jun 8, 2022 · Open the Main Valve. Slowly open the main shutoff valve to let water into the sprinkler system. For a ball valve, turn the lever handle one-quarter turn until the handle is parallel to the pipe; this is the fully open position. For an in-ground shutoff valve, use a sprinkler valve key to turn the valve counterclockwise until it stops. On average, a backflow preventer device costs between $35 and $600, though in some extreme cases, you might spend as little as $5 or as much as $1,000 for the device. For instance, the backflow ...BACKFLOW PREVENTERS REQUIRED · 1. irrigation and lawn sprinkler systems that do not add chemicals, · 2. flush valve toilets, hemodialysis units, · 3. units wit...Lawn care is important in maintaining a beautiful home. Learn everything you need to know about lawn care, from sprinklers to composting to planting a lawn. Advertisement Lawn care...Backflow preventers vs. check valves: greater protection is needed for potable water supplies. Check valves are relied on to prevent backflow in a variety of applications, from HVAC systems to sump pumps to fire sprinkler systems with elevation changes. But when it comes to public health and safety, many water authorities and …How to activate a sprinkler system in the spring. Backflow prevention device, also know as a Pressure-Vacuum Breaker (PVB) or an Reduced Pressure Assembly (R...Apr 25, 2018 ... We agree with the AWWA that irrigation lines need an RPZ backflow preventer or air gap. Irrigation backflow prevention is a must.Backflow prevention devices must be installed on all sprinkler systems (including sprinklers attached to hoses) using potable (fit for drinking) water. Backflow prevention …Backflow prevention is crucial to safeguard the potable water supply from contamination, and Wilkins does not take this responsibility for granted. Our Wilkins backflow preventers are engineered with precision and built to meet the highest industry standards. Ensure your irrigation system is secure and your water supply remains free from ... A backflow preventer is installed where the water main is routed into your home. It is also a good idea to install a backflow preventer if you have a sprinkler system. For this application, the backflow preventer would be installed where the sprinkle lines feed into the ground. A backflow preventer might also be known as an air gap. Open the Main Valve. Slowly open the main shutoff valve to let water into the sprinkler system. For a ball valve, turn the lever handle one-quarter turn until the handle is parallel to the pipe; this is the fully open position. For an in-ground shutoff valve, use a sprinkler valve key to turn the valve counterclockwise until it stops.How to activate a sprinkler system in the spring. Backflow prevention device, also know as a Pressure-Vacuum Breaker (PVB) or an Reduced Pressure Assembly (R...Wilkins 710 PVB Backflow Preventer 3/4 in. FPT | WK710-075. SKU. WK710-075. Free Shipping on Orders over $149. Sales Price $88.48 Our Price $120.95 You save 27%. Add to Cart. Add to Project Add to Favorites Compare. Skip to the end of the images gallery.Apple Pay is the highest-ranking peer-to-peer payment (P2P) system in terms of payment authentication to prevent fraud and data privacy, according to Consumer Reports’s first ever ...Oct 19, 2021 · A backflow preventer is a device designed to ensure that water inside a building's fire sprinkler system flows in one direction only -- from the water main to the system's pipes. This is necessary to prevent any potential cross-contamination that can occur when water from the fire sprinkler system flows backward into the water main, carrying ... Feb 27, 2022 · Pressure Vacuum Breaker Basics. A pressure vacuum breaker (PVB) is an essential component of irrigation systems. It provides protection against backflow or back siphoning of water from the irrigation system to your home's freshwater supply—your drinking water. Most sprinkler systems have a PVB located outdoors either next to an exterior wall ... That’s why plumbing codes require a backflow preventer on hydronic heating systems, outdoor hose bibbs, and sprinkler systems. To remove a malfunctioning preventer, shut off the water-supply valve and purge the heating system so that its water level is below the preventer. If it’s connected to the supply pipe with a threaded fitting, use a ...Backflow preventers provide a critical interface between a building's fire protection system and the water supply that feeds it. A backflow preventer is a device …1-1/2 in. x 36 in. Vacuum Breaker/Backflow Preventer with Flush Tube in Polished Chrome. Add to Cart. Compare. See Low Price in Cart (1) Wilkins. 1 in. 950XL3 Double Check Backflow Preventer. Add to Cart. Compare $ 55. 20 (6) Cash Acme. 1 in. FIP BF-1 Series Dual Check Backflow Preventer. Add to Cart.Backflow Prevention Devices: Atmospheric Vacuum Breaker (Anti-Siphon) The atmospheric vacuum breaker is the simplest and least expensive backflow prevention device for one or two-zone anti-siphon irrigation systems. It is also the least reliable and least often recommended. Most large cities and suburbs do not allow the use of … 1. Backflow Preventer. Sprinkler system backflow preventer is a term used to describe a device that, upon detecting the presence of a contaminant, prevents it from flowing in the opposite direction (backward) through your sprinkler system. Sprinkler system backflow Prevention ensures that water flows only in one direction in a piping system. The code also looks at the design of the systems themselves Section 603.5.14.3 Hydraulic Design states : Where a backflow device is installed in the potable water supply to a fire protection system, the hydraulic design of the system shall account for the pressure drop. through the backflow device.It's a fairly standard quarter turn ball valve, for permanent repair, take the union loose, remove the valve and replace with like. No patch you can apply will properly seal against expansion propagating through the patch material or breaking the patch material off eventually.To avoid this, follow the steps below to prepare your system for the cold: Turn off and drain water supply to the system. Drain water from the backflow preventer. Drain water from sprinkler pipes. Blow compressed air into the system to further clear the water. Insulate exposed pipes and properly set the valves.Shop now: https://www.sprinklerwarehouse.com/product/lawn-irrigation/backflow-preventersThis video will help you understand the importance of installing a ba...Double check valve assemblies (DCVA) are the most commonly approved type of device for inline underground sprinkler systems and a good choice for interior or underground installations. These backflow preventers are less susceptible to frost damage because they are usually installed below ground or in a basement making sprinkler system ...About This Product. This double check valve assembly is designed to prevent the backflow of polluted water from entering into the potable …Backflow prevention devices must be installed on all sprinkler systems (including sprinklers attached to hoses) using potable (fit for drinking) water. Backflow prevention … De-ice the system. By removing the frozen element, we can better assess the damage of your backflow. Repair the affected area. Sometimes, you simply need a de-icing treatment. Other times, specific parts of the system need replacement. Our team will determine the best course of action for your property. Mar 22, 2023 · You probably want 1 to 2 inches of water per week, depending on your vegetation. Measure water by placing a cup or other container in each zone. Run the system for a regular cycle and measure the amount of water in the container. This will tell you how long your system needs to run to get the right amount of water. BACKFLOW PREVENTERS REQUIRED · 1. irrigation and lawn sprinkler systems that do not add chemicals, · 2. flush valve toilets, hemodialysis units, · 3. units wit...One big technology by-product of the Covid-19 pandemic has been a much stronger focus on online education solutions — providing the tools for students to continue learning when the...1-1/2 in. x 36 in. Vacuum Breaker/Backflow Preventer with Flush Tube in Polished Chrome. Add to Cart. Compare. See Low Price in Cart (1) Wilkins. 1 in. 950XL3 Double Check Backflow Preventer. Add to Cart. Compare $ 55. 20 (6) Cash Acme. 1 in. FIP BF-1 Series Dual Check Backflow Preventer. Add to Cart.Measure Before Purchase - The outer size of sprinkler valve cover is about 16”W x 20”H. Fit up to 14” wide backflow preventer, sprinkler system, exterior pipe, etc. (Given the thickness of backflow valves, it's best to leave at least 2 inches for a better fit.) Please carefully measure your pipe size before purchase.It's a fairly standard quarter turn ball valve, for permanent repair, take the union loose, remove the valve and replace with like. No patch you can apply will properly seal against expansion propagating through the patch material or breaking the patch material off eventually.100-ASVF Flow: 0.2 to 40 GPM (0,05 to 9,085 m³/h; 0,01 to 2,52 l/s). For flows below 3 GPM (0,68 m³h; 0,19 l/s) or any Landscape Drip products application, use a 200 mesh filter installed upstream. Water temperature: Up to 110°F (43°C) Ambient air temperature: Up to 125°F (52°C) Solenoid coil resistance: 38 Ohms.A backflow prevention system… prevents backflow. Backflow prevention systems are devices installed onto a pipe that only allow water to flow in one direction. Think of it as a one-way gate that allows water from the city’s public water supply to flow into your home’s piping but stops water if and when it ever tries to flow backwards into ...See list of participating sites @NCIPrevention @NCISymptomMgmt @NCICastle The National Cancer Institute NCI Division of Cancer Prevention DCP Home Contact DCP Policies Disclaimer P...A backflow prevention assembly (BPA) prevents the potable (drinking) water in the public water supply from becoming contaminated if there’s a backflow of non-potable water from your …Wilkins 710 PVB Backflow Preventer 1 in. FPT | WK710-100. SKU. WK710-100. Free Shipping on Orders over $74. Sales Price $102.72 Our Price $135.95 You save 24%. Add to Cart. Add to Project Add to Favorites Compare. Skip to the end of the images gallery. De-ice the system. By removing the frozen element, we can better assess the damage of your backflow. Repair the affected area. Sometimes, you simply need a de-icing treatment. Other times, specific parts of the system need replacement. Our team will determine the best course of action for your property. New research reveals new ways that our prison system has failed. This item has been corrected. Last week, president Obama vowed to end mass incarceration, the imprisonment of 2.2 m...1-1/2 in. x 36 in. Vacuum Breaker/Backflow Preventer with Flush Tube in Polished Chrome. Add to Cart. Compare. See Low Price in Cart (1) Wilkins. 1 in. 950XL3 Double Check Backflow Preventer. Add to Cart. Compare $ 55. 20 (6) Cash Acme. 1 in. FIP BF-1 Series Dual Check Backflow Preventer. Add to Cart.Backflow preventers are a prime target for theft because they are made from valuable metals. With the replacement cost being as high as $500+ it is important that you take proper precautions to prevent theft. Do this by incorporating an anti-theft device with your backflow preventer. An example of this is a … See moreNOTE: If the water doesn't stop spitting out after a couple minutes, you haven't fully turned off the water in step 1. 3- Leave the smaller bleeder valves open - This will allow the water to expand and freeze without being hindered and causing damage. 4- Insulate your Backflow - At almost all home improvements stores, they carry pipe insulation ...A Safe Sprinkler System In Cold Weather. This article explains how to winterize your system. Winterization is an important part of maintaining a properly running lawn sprinkler system. Following these steps can help you protect your backflow preventer device from freeze damage. Where you live plays a big part in which steps you will need to follow.Note: The installation of a backflow prevention assembly does not automatically constitute approval for agricultural rates. Auxiliary water sources including, but not limited to, reclaimed water, swimming pools, catchment tanks and ponds. Construction Activities; Commercial Activities; Government Facilities; Irrigation/sprinkler systemsApr 25, 2018 ... We agree with the AWWA that irrigation lines need an RPZ backflow preventer or air gap. Irrigation backflow prevention is a must.How to activate a sprinkler system in the spring. Backflow prevention device, also know as a Pressure-Vacuum Breaker (PVB) or an Reduced Pressure Assembly (R...Another popular option for backflow prevention in indoor and outdoor plumbing systems is a double-check valve assembly (DCVA). It is the most frequent type of subterranean or in-line backflow preventer. Source An inlet shutoff valve and a valve body with two spring-loaded, independently working check valves, four test valves, and an …A backflow is required for any sprinkler system supplied from culinary water (drinking water). ... RP is the best protection available for sprinkler systems connected directly to a pressurized culinary / potable water system. The RP backflow preventer is also the most expensive option in most cases.Sentinel3-in ABS Backflow Preventer with 4-in Outlet Diameter, Holmes Approved, Maximum Pressure 65 PSI. 4. • Sentinel is the only consumer backwater valve on the market that is a Holmes approved product. • Fits 3 in. (75 mm) floor drain and 4 in. (100 mm) floor drain with included adapter. • Sits in an open position so normal drainage ...Why is a backflow preventer required on lawn sprinkler systems? Monday, July 9, 2018. The science behind the problem is fairly simple. Warm air expands and can hold more humidity (moisture) than cool air, but when it comes in contact with window glass that is significantly colder than the air, the surface chills and shrinks the air volume. This ...backflow preventer cover. Related Products. ... The Orbit Wireless Rain and Freeze Sensor prevents your automatic sprinkler system from watering during a storm and is controlled by remote so there is no wiring to string to your timer.This wireless system is easy to set up and adjust, and it works with 24-volt sprinkler timers. ...Jun 5, 2018 · The code also looks at the design of the systems themselves Section 603.5.14.3 Hydraulic Design states : Where a backflow device is installed in the potable water supply to a fire protection system, the hydraulic design of the system shall account for the pressure drop. through the backflow device. Having a dog that is constipated can be distressing for both you and your furry friend. Constipation in dogs can cause discomfort and even lead to more serious health issues if lef...Measure Before Purchase - The outer size of sprinkler valve cover is about 16”W x 20”H. Fit up to 14” wide backflow preventer, sprinkler system, exterior pipe, etc. (Given the thickness of backflow valves, it's best to leave at least 2 inches for a better fit.) Please carefully measure your pipe size before purchase.3 Steps to Winterize Your Backflow Preventer. 1. Turn Off the Isolation Valve. After locating your isolation valve step one is simply turning it off. Not all systems will have a ball valve as pictured, some will have a gate valve (like the one on your hose bib) but a ball valve is most common. A ball valve will only turn a quarter of a turn in ...A video of water flowing in the kitchen sink to stop the spewing water. (Also, full size images.) Your backflow preventer is a Reduced Pressure Principle (RPP) (sometimes called RPZ for Reduced Pressure Zone) unit, and these are required to be tested by a plumber or other qualified serviceperson on a periodic basis -- have you tried …Step 1: Shut Off the Water. You can turn off the water to the system with the main valve, which you can find near your water meter. Some systems have valves to prevent backflow, which you’ll also need to shut off, but if your system doesn’t use potable water, it might not have a backflow preventer. Step 2: Turn Off the Timer.The backflow prevention device is a complex mechanical unit that prevents the reversal of water flow and subsequent contamination of the water supply from irrigation systems, etc. This may occur when there is a loss of water pressure in the street water main due to a water main break, over pumping of fire hydrants or a generalized system ...Backflow Prevention Devices: Atmospheric Vacuum Breaker (Anti-Siphon) The atmospheric vacuum breaker is the simplest and least expensive backflow prevention device for one or two-zone anti-siphon irrigation systems. It is also the least reliable and least often recommended. Most large cities and suburbs do not allow the use of …Serial Number visible in any installed orientation. Top access for easy maintainability. Protects against back siphonage. Typical application: irrigation system. The owner must protect from freeze damage. Maximum working water pressure: 150 PSI. Maximum working water temperature: 110F. Hydrostatic test pressure: 300 PSI.3/4 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Tee Handles, Flood Sensor. Add to Cart. Compare $ 40. 15 (6) Model# BF13434. Cash Acme. 3/4 in. BF-1 Series Dual Check Backflow Preventer. Add to Cart. Compare. See Low Price in Cart (10) Model# 34-975XL2.Connect the Air Compressor. In order to blow out the sprinkler system, you will need an air compressor that can produce air at a volume of at least 30 to 50 cubic feet per minute (cfm) and at pressures of 40 to 80 pounds per square inch (PSI). Close the airflow valves on the compressor and attach the air compressor to the irrigation system …The backflow prevention device is a complex mechanical unit that prevents the reversal of water flow and subsequent contamination of the water supply from irrigation systems, etc. This may occur when there is a loss of water pressure in the street water main due to a water main break, over pumping of fire hydrants or a generalized system ...Having a lush, green lawn is the envy of many homeowners. But without a proper irrigation system, it can be difficult to keep your lawn looking its best. The first step in designin...How to properly and quickly winterize your sprinkler system by blowing it out using your existing backflow preventer. This is a step-by-step tutorial on how...Shop for Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer 1 in. FPT, CDC4A-505-A2F for fast shipping today. Sprinkler Warehouse carries Conbraco pressure vacuum breakers for sale online or in-store. ... In rural areas, the exact regulations for landscape sprinkler systems may not be covered in local plumbing codes and enforcement of ...Backflow preventers vs. check valves: greater protection is needed for potable water supplies. Check valves are relied on to prevent backflow in a variety of applications, from HVAC systems to sump pumps to fire sprinkler systems with elevation changes. But when it comes to public health and safety, many water authorities and … The separate fire service must be protected by a backflow preventer (see Section P-806.3 of the Philadelphia Plumbing Code). If the builder determines to install a sprinkler system designed under the NFPA 13R or 13 Standards, or stand alone sprinkler systems complying with the NFPA 13D Standard, there will be additional costs encountered from Shop for Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer 1 in. FPT, CDC4A-505-A2F for fast shipping today. Sprinkler Warehouse carries Conbraco pressure vacuum breakers for sale online or in-store. ... In rural areas, the exact regulations for landscape sprinkler systems may not be covered in local plumbing codes and enforcement of ...1-1/2 in. x 36 in. Vacuum Breaker/Backflow Preventer with Flush Tube in Polished Chrome. Add to Cart. Compare. See Low Price in Cart (1) Wilkins. 1 in. 950XL3 Double Check Backflow Preventer. Add to Cart. Compare $ 55. 20 (6) Cash Acme. 1 in. FIP BF-1 Series Dual Check Backflow Preventer. Add to Cart.For more information, call our main Water Supply Division line, 512-239-4691, and ask for the Cross-Connection Control and Backflow Prevention Program coordinator. You may also e-mail your question or comment to [email protected]. Please include “Cross-Connection/Backflow Prevention” in the subject line of your e … Blue Heron Backflow Preventer Test Cock Winterization Blowout Fitting 1/4 in. FPT | TC-100. On-Sale $5.51 List Price $12.95. SKU: TC-100. Add to Cart. Insulated BackFlow Bag 16 in. x 21 in. Tan Insulation Pouch | BFA2116T. On-Sale $41.48 List Price $66.95. SKU: BFA2116T. Reduced Pressure Zone (RPZ) valve is another name for a backflow device, according to Ravinia Plumbing. Plumbers install RPZ valves in pipes to protect drinking water and municipal...There are many variables in a sprinkler system, and the kinds of parts you need to repair your system will rely entirely on the nature of your problem.. Here's a breakdown, according to HomeAdvisor, of some of the items you may need to replace and their typical costs:. Head: $3–$30 Valve: $13–$150 Backflow preventer: $125–$900 …May 20, 2014 · It's a fairly standard quarter turn ball valve, for permanent repair, take the union loose, remove the valve and replace with like. No patch you can apply will properly seal against expansion propagating through the patch material or breaking the patch material off eventually.
Line up the pressure vacuum breaker assembly, centering the outlet at the height of the second mark and the inlet is downward. Place a third mark on the riser at the bottom of the pressure vacuum breaker assembly inlet valve. Cut the riser on the third mark. Open the isolation valve to flush out any foreign material in the supply line.. Phone with the best camera
A backflow prevention device is a product that ensures water can only flow in one direction. There are multiple types of backflow prevention devices, and they all work best in specific applications. All backflow preventers, no matter the type, protect clean water lines from wastewater contaminants.To avoid this, follow the steps below to prepare your system for the cold: Turn off and drain water supply to the system. Drain water from the backflow preventer. Drain water from sprinkler pipes. Blow compressed air into the system to further clear the water. Insulate exposed pipes and properly set the valves. To protect the system, backflow prevention assemblies (devices that prevent the backflow of water) are required for all connections that may present a potential source of contamination to the public water system. For more information on the backflow ordinance or the program, please call the Backflow Prevention section at 210-233-2421. Outdoor Backflow Preventer Insulation Cover Pipe Insulation Backflow Covers for Pipe Freeze Protection Sprinkler Valve System Cover Preventer Cover Insulated Pouch (30"W x 26"H,White) 109. $1469. FREE delivery Sat, Feb 17 on $35 of items shipped by Amazon. Or fastest delivery Fri, Feb 16. Only 5 left in stock - order soon.It is important to maintain a properly functioning irrigation system. To discuss backflow testing, need repairs or have sprinkler irrigation issues to discuss in the Central Florida and Orlando areas, contact us at 407-302-2227 today.ProPlumberYard Hydrant Vacuum Breaker Brass FNPT 3/4-in Vacuum Breaker. 27. • Prevent back siphon of liquid from the garden hose back into the water supply line. • 3/4-In female x 3/4-In male garden hose threads. • Solid-brass design meets federal low lead regulations. Find My Store. 1. Backflow Preventer. Sprinkler system backflow preventer is a term used to describe a device that, upon detecting the presence of a contaminant, prevents it from flowing in the opposite direction (backward) through your sprinkler system. Sprinkler system backflow Prevention ensures that water flows only in one direction in a piping system. DCDA backflow prevention devices are designed to provide the highest level of protection from contaminants in fire sprinkler systems flowing back into the water supply. Fire sprinkler systems can contain or suffer contamination from non-potable, stagnant water that shouldn’t return to the drinking water supply or from booster pumps …Top Features & Benefits Of The Febco 765 1" Backflow Preventer. FEBCO® Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against …One big technology by-product of the Covid-19 pandemic has been a much stronger focus on online education solutions — providing the tools for students to continue learning when the...Step 2: Shut off the control system. You’ll also need to turn off your system’s automatic timer. Set your system to “off” or “rain mode” to prevent it from trying to turn on during the ...Buy Winterize Sprinkler System Blow Out Adapter: Air Compressor to National Pipe Threads (NPT) Set with Shut Off Valve - Contains all common sizes!: Watering Equipment - Amazon.com FREE DELIVERY possible on eligible purchases ... Adapters to Winterize Blow out Backflow Preventer and Pressure Vacuum Breaker (PVB) for …BACKFLOW PREVENTERS REQUIRED · 1. irrigation and lawn sprinkler systems that do not add chemicals, · 2. flush valve toilets, hemodialysis units, · 3. units wit...This 1/2 in. dual check valve backflow preventer with intermediate atmospheric vent helps prevent the reverse flow of hot or cold polluted water from entering into the potable water supply. This valve is designed for continuous pressure non-health hazard applications in smaller supply lines, such as laboratory equipment, processing tanks ...Febco 765 backflow preventers and pressure vacuum breakers help prevent freeze damage. Shop Febco irrigation supplies online for fast shipping. ... going from the house to the mainline, it creates a siphon effect and will pull anything in the sprinkler system and in the puddles around the sprinkler system with it. If your garden hose was on at ...Locate the main water supply for your irrigation system and turn the valve fully off. Drain backflow preventer. There should be two “check valves” on your backflow preventer that can be drained using a flathead screwdriver. Turn these to their open position, let them drain fully, and leave them open. Turn ball valves to half open.These devices rely on specific valves: check valves or two one-way valves. These valves get lined up in a series to prevent backflow from occurring. Think of it as a one-way door—once it’s gone out, there’s no other way for it to come back in. If any pressure coming back to the water main exceeds that of the route of flow, then the valves ....