Yong heng bleed valve system

Dont know the lay out of your system but here is mine: Hose from compressor into Dissicant filter, filter has a one way Foster male on the entrance side. When i bleed the compressor (it's mainly because of water and this way) i do not get blow back.. From the filter (male Foster without one way valve) i connect my fill probe/system wich has a bleed valve (that i use when the bottle is full). That way my filters are only one way.

If you are going to ad a bleed in the line, position it before the filter. You want to drain any condensed liquid before it enters your filtration, one to preserve the media and two there shouldn't be ant moisture upstream anyway. I'm adding a bleed with a check valve at the compressor outlet block for those reasons. The check valve allows me to shut down and restart without depressurising, using the bleed on the compressor. The bleed before the line lets me purge any moisture in there that would otherwise get sucked into the filter when bleeding at the bottle. I also use a check and bleed at the bottle in case something blows or leaks downstream resulting in a loss of all stored air. This is the one that I will be using before the filter. https://www.aliexpress.com/item/4000125018554.html?spm=a2g0s.9042311.0.0.54294c4dBSezsy I have ordered the basic version and I have a male QD plug with a non-return insert that can be bought from the same or other suppliers for a couple of bucks. https://www.aliexpress.com/item/32829057845.html?spm=a2g0o.detail.1000014.25.74c54584ScIk4A&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=d5413c57-031d-474f-9632-fe7b49211dec BTW, if you aren't using stop valves, none of this is necessary. The bleed on the compressor is more than adequate to purge the system. There is nothing wrong with letting air flow back through the filter/filters.

The Yong Heng has bleeder valves in the correct place and they werq quite well. Eaglebeak's suggestion makes sense but if your filter is higher than your compressor, which it should be, there shouldn't be much in the way of moisture there. I would suggest if you are worried about moisture that you make sure to open the purge valves every 3-5 minutes, while running the compressor, for a second to purge any moisture. Then take the tiny YH filter out every 10 to 20 minutes of run time, set it aside to dry, and put another filter in. Next time put the filter you set out to dry back in. It's a very easy thing to do saves filters and keeps trace amount of moisture out of your tanks/guns.

I would swap the position of the bottle and pump. Moisture will condense and gather at the lowest point and that's where the bleed should be. If you must have a bleed on the bottle side, get a DIN 300 fill adaptor with a hose, gauge and built-in bleed valve. You will need a fill adaptor with a bleed to fill your gun anyway.

The check valve should be installed here. The bleed valve is best located immediately after the check valve although anywhere after that is OK as well. If you have already got a bleed valve at the tank, you dont need any extra.

moisture / water will go up no matter where your filter is placed

the inner diameter of these hoses are really small

i would attach a small filter direct on to the compressor to have a first barrier for oil

less oil in your bigger filters will keep the molecular sieve / active charcoal more effective!



i had a check valve in my yh after the last bleed valve (factory made at first i was not aware of it) but the o-ring fell apart and i did not replaced it for good reason (on my opionion)

if my tank is full, i turn off the compressor, close the tank valve and open the second bleed valve and all the remaining air in the filters flushes backwards through the bleeding valve and a ton of moisture is coming out (after longer runs more)

you dont need extra bleed valve, just use the one on the yh itself and put a oneway check valve between the last filter and your scba.

I bleed every 3 mins and use two filters(black then gold).

the black only has the cotton media and it usually only has moisture halfway through it after 15mins.

you dont need extra bleed valve, just use the one on the yh itself and put a oneway check valve between the last filter and your scba.

I bleed every 3 mins and use two filters(black then gold).

the black only has the cotton media and it usually only has moisture halfway through it after 15mins.

Click to expand...

If you are going to install a non-return valve anywhere in your system, you will need a bleed upstream or you will find that you can't uncouple anything. The op is not using an SCBA tank and the SCUBA valve in the picture does not appear to have a bleed. I may be wrong because I can't see it clearly. If the SCUBA tank valve does have a bleed, why is he asking if he should add one? The set up that he has now will work fine. Adding check and bleed valves will just insure against losing a tank full of air if something bursts or leaks and at the other end allows the pump to be shut down and restarted without having to drain and repressurise the lines and filters, causing more wear and tear. I install mine at the tank and at the pump outlet because that's where, I believe, they will be the most effective.

Thank you to everyone involved in this thread.

I'm learning a great deal just following along

Ed

I think that you are going to have to work this out yourself. I have tried to explain to you in a very simple way the reasons for why and where to install and left links to things I use myself. If you don't understand the advice I have given you, there is no point going any further. You have to work out why you need to add these things. Once you understand why you think you need these accessories, then you'll have a better idea of where to position them. The setup you have now will be just fine until you have a better understanding of what you want to achieve and to find the right fittings which is another can of worms. Asking for advice on this forum will only confuse you more unless you have a basic understanding of what you are playing with.