My goal is not to create conflict but to clarify to other visitors to this site that there are differences in the items and the details are important. A vacuum breaker, vacuum relief valve and back flow preventer are all different for different applications. Purchasing the wrong item, installing it then NOT being able to return it could become costly for a consumer.
I've been reading between the lines for a few years with customers and it's always a crap-shoot if we actually hit the nail on the head. But if you can post a vacuum breaker for domestic hot water tank supply or post a code specifying a breaker, not a relief valve I'll keep an open mind. I see the issue now Sometimes, I get to reading so many of these I do, hopefully only on occasion, mistype something.
I appreciate the correction on that so others can't get screwed up by it all. As noted in my original post, however, the placement s of the vacuum relief valve is correct! Thanks again! Dec 8, , PM. Thanks for clearing that up. Vacuum relief valve is the right answer for that application. But do you need a vacuum relif valve on a domestic heat exchanger when the heat is by a steam coil?
Dec 9, , AM. Hi Rcmeke Nope, a vacuum relief valve is not commonly installed on a tankless coil. Dec 16, , PM. Hello, could you possible explain to me the difference between the two? PowerPlantMech Posts: 1, Reputation: 1. Aug 15, , AM. Still wondering in ? Usually a vacuum breaker is what is considered to protect the water system from syphoning contaminated water into the piping system, as in toilets, urinals, etc.
A vacuum relief valve does in fact break vacuum but is more used in the line of "letting air in" so the hot water tank can be drained for service, like for heating element replacements, etc. A more complicated system like indurtrial plants and the like use backflow preventer valves. These protect the main water supply from contamination by preventing "back flow" from the facility to the water line in the event of a pressure drop or loss in the line.
Good information can be found on Wikipedia as well. JVK Posts: 1, Reputation: 1. Aug 13, , AM. Yes power plant mech is correct a vacuum breaker is to prevent syphoning,u will find these on application which will have a hose or some means of cross connection from water to sewer.
So when at times there's a drop in city pressure an a syph comes on,if your running your sprinkler, before it comes back threw your hose bib your vacuum breaker will stop it. Your vacuum relief is designed to watch your heater not so much for draining an service purposes.
It's a relief to help your TMP valve so in case it does pop off for extreme heat it will help TMP discharge faster by letting air in as well as cold water to prevent your house turning in to a mini nasa rocket lauch place.
We thank you for the information, however, You're responding to a 4 year old dead thread. Please check the date before you post. Thanks Tom. Not your question? Ask your question View similar questions. Cold water supply line noises [ 12 Answers ] When I turn on any household faucet, specifically the cold water, it makes noises as if their may be air in the line. Cold water pressure relief valve leaking [ 6 Answers ] My pressure relief valve is leaking.
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Find latest posts by pghplumber. Find latest posts by rcmeke. Find latest posts by mattwm. Send a private message to PowerPlantMech. Find latest posts by PowerPlantMech. Send a private message to JVK For flanged valves, be sure to draw the bolts down evenly.
This is especially crucial for cast iron valves. If you tighten one side all of the way and then the other, not only will you not be able to tighten it completely, but you could crack the valve.
Avoid overtightening the valve. This can damage both the inlet and the outlet threads and cause leakage. Apply pipe dope to the male threads only.
Pipe dope is a compound that prevents valves from leaking, but if you apply it to the female threads, it could contaminate your system. Inlet piping The inlet piping should be short and direct. The inlet should never have a smaller diameter than the valve itself. This will constrict the flow of steam, air, or other media.
The inlet should never be located near excessive turbulence on the vessel. Outlet piping The outlet piping should always be supported. This can lead to excessive leakage. The nominal size of the outlet piping should be as large or larger than the valve outlet size.
The outlet piping should not produce any strain due to thermal expansion.
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