Having a pond, with a waterfall myself, I just keep the same rate of flow to the waterfall at all times. This helps with the circulation and filtration of the water naturally.
If there is need to slow the flow or restrict it I use a small diverter valve thta you get at any pond supply store.
The...
The pressure regulating valve works by a force being applied to the spring which is the desired set point, this pushes down on the diaphragm holding the valve in an open position allowing flow through the valve. Somewhere downstream a pressure reading is taken and transfered to the underside of...
You should contact the manufacturer and give them the information in regards to flow and pressure drops that you wish to maintain. the manufacturer will then be able to tell you what valve you need after doing the appropriate sizing calculations.
Look at several websites and you may find what you are looking for:
Jordan
Fisher/Bauman
Masonealan
Kammer
All of these companies have Bellows valves. Jordan Kammer and Bauman offer Bellows in several models.
here is a simple look at the most common leakage classes and how valves are tested to establish that leakage rate.
ANSI CLASS Class III
Maximum Seat Leakage 0.1% of rated valve capacity Test Conditions
Air or water @ 50 - 125 F. 45 - 60 psig or Maximum operating...
Try the websites of various valve manufacturers, a lot of them have sizing programs on the site or downloadable from the site.
Jordan has one on site. that you can download. It offers globe style, sliding gate and low flow sizing for contro valves and regulators as well as both flow and Cv sizing.
If you do not need safetey relief you may want to try a back pressure regulator.
The valve will stay closed to hold pressure in the line up to the set point and then open to relieve the pressure when it rises above the set point, the media can then be piped back into the system at some other...
There are many valve companies that make 6" pressure reducing valves in 316 stainless steel. Jordan and Fisher come to mind. Check out their websites.
The point made by Albeto is very valid. try getting the valve sized and you may find that you do not require a 6" valve.
If you are regulating pressure with a control valve you still need the by-pass line. If you use just a control valve, it will restrict flow as the demand decreases and the pressure upstream of your valve can raise and can cause problems with your pump.
If you have a by-pass line installed, you...
Abeltio is right look at the attached ANSI test Standards for valve shut off. They are very specific as to what the test media is. By changing the test media you change the shutoff of the valve as Abeltio pointed out.
The manufacturer of the valve should be able to assist you if you need to test...
Look on the Jordan Valve web site. www.jordanvalve.com
This is a sliding gate valve which I think that you are referring to in your question.
You can on this siste see an electronic presentation of how the sliding gate operates.
This may assist you in making your decision.
It is different from a...
I sympathize with you on this one.
It sounds like what you need is a solenoid valve that just turns on and off very quickly. Doing this is a small line that has little pressure in the line should enable you to get a small amount of water through the solenoid and to "drip" into your...
Depending on the actual flow rate of the system, and the required Cv to pass the flow, you might be able to go with any number of some of the globe style fractioanl flow valves on the market. Some can handle Delta p's as high as 344 bar (5000 psig).
Again this if dependent on the flow...
Any valve sold under that classification would have to meet the standard.
To attain the ANSI Standard you would have to go to their website and order a copy of the standard.
If you are worried that a valve has worn out after being in use, it would be best have the manufacturer evaluate it for...
