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Thanks for watching and pleased that you found it helpful.

You need to consult with a manufacturer. They do make plastic backflow preventers.

Thanks for viewing the video and you comment.

The supply pressure is where the water enters the backflow preventer. It is the inlet pressure or the pressure at TC#1. Supply pressure is typically higher than the outlet pressure. Backpressure is the exception.

Thanks for the comment and viewing the videos. I hope they were helpful.

The purpose of the video is to educate, entertain, and engage. Distractions are everywhere, so put them aside and concentrate on what is essential. You could turn off the sound.

Thanks for viewing the video and your comment. Hope it was helpful.

When the backflow preventer is in a static state no downstream demand the check valves are closed. When in a static state the pressure loss across the check valves is generated by the check valve springs. Typically, a minimum of one pound loss on each check valve. The check valves open when there is a flow through the device and a downstream demand. If there is a backpressure issue (higher pressure on the outlet side of the device) the second check valve should close drip tight if operating properly. I hope this answers your question and thanks for viewing the video. If you have any further questions, let me know.

Thanks for the comment. I have not encountered a video for making a backflow test kit, but I have tried unsuccessfully. The differential gauge is available, but purchasing a test kit in the long run was more economical. Also, the test kit would have to be calibrated. Getting used test kits and parts is an option that I have used.

The video that you are referring to assesses backpressure. In this procedure, the check valves do not have to be drip tight. If they are not drip-tight the pressure at test cock four would be the same as test cock one. If backpressure is present. the downstream shut-off valve is not closed drip-tight and the pressure reading at test cock four is greater than the pressure at test cock one. Thanks for watching the video and I hope this answers your question.

When conducting the "no-flow validation test,' the differential pressure gauge must record a positive reading. Therefore, the check valve must be working to perform the test. However, the video that you watch is assessing backpressure. In this procedure, the assessment can be performed with non-working check valves.

Thanks for the comment, and if you need any further information let me know.

There is a video without music for testing the RP. Sorry, you did not like the music; I may remake the videos without music when I have time. I am presently working on other videos without music. Nonetheless, I hope you found the videos useful. Thanks for the comment.

Andrew, thanks for the comment and watching the videos. There should not be a required test procedure because they are all identical. The test form does not indicate what procedure is used, it only asks for the differential pressure and does it meet the standard. All tests are the same; the only difference is the testing sequence. Every “procedure” measures the differential pressure to determine if the check valves are drip tight and if the assembly provides protection; they can be assessed in many ways, but again, the test should demonstrate the protective aspects of the backflow preventer. It is very unusual for a state to require a specific way of testing. I would question that requirement. Most states require the individual to be certified to perform the test. Regarding the line pressure - if you notice, the inlet pressure is noted when backpressure is assessed before testing the DCVA and RPZ. Just a note knowing the line pressure is not necessary when testing backflow preventers since it is a relative test-however, some forms require the recording of line pressure. Your correct line pressure can be recorded when conducting the PSID of the PVB check valve if there is a pressure gauge on the high-pressure hose. If not, use a standard pressure gauge like the one in the videos to measure line pressure.

@@JimmyBackflow I agree a testing procedure is a procedure. I have just out of curiosity tested assemblies in some of the other ways I've seen online and have gotten the exact same numbers as the ways my state teaches us to test. When initially getting certified 5 years ago before our practical test witnessed by proctor. I had been watching a lot of videos of testing so I would be fully prepared. I noticed it then the different ways tests would be done. I asked my proctor about it and he informed me "yes there are some 2 hose tests for this and single hose tests for that but only the way you are taught to test here is approved here." I am certified for my entire state, through training and municipal orientations. In the field if a meter is locked the municipality will send out someone from the cross connection department to unlock the meter and they have to witness you testing. They will quickly inform you if you miss a step or are about to. I have asked them as well have they ever seen the other ways assemblies are tested and they've all said yes however it is "not as accurate or approved here". Like I said though I have played around and done the different ways myself with the exact same numbers as our "approved" way. I will ask again this week when I get my re-certification and see what answer I get this time. I will let you know. Thank you for the reply you are very clearly well versed and knowledgeable, the name "Jimmy Backflow" would explain that haha.

Thanks for viewing and for the comment!

Thanks for the comment. Hope it helped with your recertification process.

It is state dependent. What state are you working in. Some states require internal inspections but only on testable devices installed for service protection. New Jersey regulations require a Physical Connection Permit be obtained by the owner of a facility where the physical connection installation is to be made with a community water supply (Physical Connection Permits are not required for private residences). Physical Connection Permit has to be renewed annually and requires each backflow prevention device covered by the permit to be tested quarterly and internally inspected annually.

Rob F. Please provide a more detailed statement regarding your comments. What are your qualifications for making such a statement? All test procedures measure the pressure loss across the check valve. The only difference is the sequence by which the tests are conducted. In the video, the first check valve differential is measured, the second check valve is back pressured, a validation test is preformed, and the relief valve is opened by introducing pressure into the zone. Also, which is not conducted by ABPA is the differential test of the second check valve. ABPA does the same but in a different order. I suggest you read up on how backflow prevention device assemblies are tested to confirm reliability. Let me know if you would like further training!.

@JimmyBackflow guess you're not familiar with abpa. Nor with the terminology. Been a tester in the city of sioux falls for over a decade along with asse, Iowa and Nebraska specific. Also having no problem reading USC cross connections 9th or 10th edition. You should try multiple classes from multiple providers. Quit being so close minded. I watched your video and just felt a little sorry for you. Have a good one.

@@robf4605

@@robf4605 Rob, not sure where you are going with this, but you need to be more specific as to comments. Pay more attention to the testing aspects and less time criticizing what you do not know. Stop guessing! Read page 255 FFCCCHR 10th addition. The difference is the sequence of the tests. I am very familiar with all certification programs and provide instructions in all aspects of the testing methos taught by APBA instructors. I am very familiar with the methods stated in the USC Manual of Cross-connection Control. I provide instructions on all test methods in my training. I am not sure what you mean by being close minded because I am not sure what your problem is with the video. Please in the future provide constructive criticism --- I am not interested in your nonconstructive opinions. As you suggested, --- I have attended training from other certification programs and held certifications from several states and certification organizations. (Been around for a long time) The method in the video is taught by trainers throughout the New England states, NY, PA, and NJ. This method is listed in the AWWA M14 Manual and follows ASSE 5000. Why are you feeling sorry for me? (Strange statement!)

@JimmyBackflow lol, it's testing backflows. Possibly the easiest thing I've ever come across that you can get paid for. I'm just giving you shit. Just keep doing what you're doing bud.

The DCVA is approved for backpressure situations. I refer you to ASSE, USCFCCCAHR and AWWA. What are the bases for your statement?

For your entertainment and to keep you interested. In addition, it keeps other trainers from steeling my work. I like music. Nonetheless, I hope you learned the art of testing a PVB. Thanks for viewing the video and commenting.

Robert by your comment I take it that you are not a music lover but thanks for the comment. I enjoy all types of music and like to incorporate music into my training to make the videos more interesting. Nonetheless, I hope you gained some knowledge by watching the video and I hope you continue to watch other videos. If you do turn down the sound. As the song goes "you can't please everyone, so you got to please yourself."

Thanks a lot

Glad it helped!

Backpressure is greater than the inlet pressure and is prevented from flowing into the potable water system by a closed second check valve. If the second and first check valves are not drip tight, the backpressure non-potable water will lose pressure due to friction factors as it flows in the unwanted direction. When water flows through the backflow prevention device assembly, the pressure loss is due to the spring-loaded check valves. If both check valves are not holding drip tight against backpressure, the check valves are open, and the check valve springs are not creating the pressure loss with the water flowing in the unwanted direction. With backpressure, some pressure loss may be present in the body of the assembly but insignificant.

@@JimmyBackflow I got ya. Love the content of your videos and appreciate you making them. Thank you for taking the time to reply my question.

You can install a pressure vacuum breaker on the PVC vertical line that leads to the sprinkler system, providing that the pressure vacuum breaker is 12 inches above the highest sprinkler head. Without seeing a diagram, I can't say for sure what is the best solution.

Jonnny, no water flows from high to low pressure --- from left to right in this diagram. If backpressure is present downstream on the right side of the slide, this is now the high-pressure side. In this case, if operating correctly, the second check valve prevents the high pressure from flowing back into the inlet pressure. If a backshphonage situation is occurring in the inlet system, the pressure is subatmospheric and the pressure downstream of the backflow device assembly is atmospheric. The first check valve prevents non-potable from entering the system is operating correctly. The flow is from high to low.

Yes. Rick, if backpressure is present at test cock number four, the downstream shut-off valve is not drip tight. Try reclosing. If the backpressure does not diminish, replace, or repair the downstream shut-off valve. Test the assembly if you can eliminate the backpressure.

Not to worry. What is happening is you are diverting high-pressure water away from the sensing line which is keeping the relief valve closed when you open the high control valve on the test kit. Test cock number two is close to the sensing line. Close the high control valve and continue with the test.

@@JimmyBackflow should have stated, relief opens after shutting high side after bleeding air. So test would still be valid then? Thanks for your time,help,response.

@@connpiper If water did not discharge from the relief valve after closing the downstream shut-off valve, the first check is holding drip tight provided that the RP was in a static state. If after bleeding the air out the high side of the test kit and the relief valve discharged and stopped, fluctuating inlet pressure was the cause. Continue with the test.

Thank you Jimmy.

Thanks for watching the video. Simple test. To measure the differential pressure across the DCVA, check valves, close the downstream shut-off valve, and connect a standard pressure gauge (200 psi) to test cock #2. Open the test cock and record the pressure reading. Close test cock #2, remove the gauge, and connect it to test cock #3. Open test cock #3 and record the reading on the gauge. Subtract test cock #3 reading from test cock #2 reading. The pressure loss across the first check valve must be one psi or greater. For the second check valve differential, conduct the same steps using test cock #3 and #4. The pressure loss across the second check valve must also be one psi or greater. This procedure works, providing there is no downstream demand.

@@JimmyBackflow Thank you for your answer. Actually I have watts LF909 and i know the Backflow is tested on RPZ. Is it same way to test #1&2 check valve for RPZ ? I am not sure if you receive my email. Please see it and kindly reply when you are free. Thank you again.

@@jeonghwanbae2111 A simple test for the RPZ would be to follow the procedure previously stated to confirm the DCVA check valves. To test the opening point of the RPZ, connect a pressure gauge with a bleed attachment as seen in the DCVA video (best to use 0 to 100 Psi or less) to test cock #2. Open test cock #2. With the gauge reading pressure, close the upstream and downstream shut-off valves. Next, open test cock #3. When the water stops flowing out of the test cock, the gauge reads the static pressure upstream of the first check valve. Next, open the bleed valve on the pressure gauge. Water discharges out of the relief valve, and the gauge reads the opening point of the relief valve.

@@JimmyBackflow Thank you so much. I measured the pressures for each cock #2&3&4 and found the differences between them. I tried to measure 2&3 in one time per your class but I am in difficulty to find correct gauge with my tool. I am going to send 4 pictures showing the pressure of each cock for your advice, if you don’t mind. Thanks

I can see clearly now, the rain is gone I can see all obstacles in my way Gone are the dark clouds that had me blind It's gonna be a bright (bright), bright (bright) Sun-shiny day. (Johnny Nash) I like music and my purpose is to educate, entertain and engage. if you watched the complete video, you would have noticed that at the time of the test, the music was muted. it is possible to learn how to test a backflow preventer by just watching without the sound. Just pay attention to what is being done. I will provide you a copy of the written instructions if you provide me with your email address. Jorge, sorry you did not like the music.

I was just about to leave the same comment. Ruthless music at that. Makes me suicidal

Thanks

TC#1 is typically used for maintenance purposes and can be used to create a static state when the downstream shut-off valve is not drip tight. The purpose of TC#2 is to measure the pressure upstream of the first check valve. The purpose of TC#3 is to measure the pressure downstream of the first check valve and upstream of the second check valve. The purpose of TC#4 is to measure the pressure downstream of the second check valve. By knowing the pressure upstream and downstream of the check valve one can determine the pressure loss across the check valves. The differential pressure across the check valves of a DCVA shall be 1PSID or greater to comply with the industry standards. I suggest you view the testing videos for further information on testing.

Yes, sure ---- Use any of the videos. I use these videos to promote my online cross-connection control and backflow tester training offered at www.ceuplan.com.

Yes, and the third part will be the relief valve.

The "Z" stands for the area between the first and second check valve "the Zone" - Some manufacturers refer to this type of backflow preventer as a "Reduced Pressure Zone Assembly" while other manufacturers refer to them as a "Reduced Pressure Principle Assembly"

@@JimmyBackflow oh wow, this comment was really helpful! Thanks!

Very interesting question! Not sure that a drip line will create backpressure since the drip line will be subjected to the atmosphere pressure. Therefore no need for a check valve to prevent backpressure. However the installation of the check valve will not impact the operation of the pressure vacuum breaker. The pressure vacuum breaker can be subjected to pressure downstream that is less than the inlet pressure. So as long as the pressure downstream of the pressure vacuum breaker is less than the inlet pressure it will work just fine with regular maintenance and testing.

Thanks for viewing the video, and you insightful comment -- I hope you learned something.

Dude you fail to understand how pressure vacuum breaker works --- just because the steps are not the same it does not mean that the test of the pressure vacuum breaker was not conducted correctly. This is not the USC 10th edition video on how to test a pressure vacuum breaker but it is a video that effectively demonstrates the operational condition of a pressure vacuum breaker. As a tester you should understand how a pressure vacuum breaker functions and what is required to perform test to determine that the pressure vacuum breaker is providing protection. The test of the check valve and air inlet valve are performed the same way as the USC 10th edition but conducted in a different sequence. A well trained tester should be able to see that the process of testing is the same. Test the check valve to determine that is closes drip tight and test the air inlet valve to determine that is opens. The test is conducted during a static state. Understanding how a backflow prevention device functions is critical in the understand of how and why the test are performed. Keep reading to understand what you are required to do to perform the test. Just reading the instruction without understand what is being done does not make for a good tester. Thanks for viewing the videos and you comments. I hope viewing the video caused you to think about what you are actually doing when conducting the tests.

This video shows how to measure the differential pressure across the check valve by my measuring the pressure at test cock number one and test cock number two. The test kit calculates the difference. This procedure is conducted as the PVB is in a pressurized state. Note that the upstream shut-off valve is in an open position. The procedure that you are referring to and most likely taught, measures the pressure at test cock number one while removing the pressure downstream of the check valve. The test kit does not calculate the difference in pressure but measures the pressure at test cock number one. I both cases the pressure reading shall be 1 PSID or greater. Both way are industry acceptable. In both test procedures the air inlet valve opening point is measured by removing the pressure upstream of the air inlet valve and downstream of the check valve, simulating a backsiphonage situation. Hope this helps you better understand the process of conducting the test of a pressure vacuum breaker.

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