Actually, the two actuators are very similar. The Gemu has a spring, diaphragm, and plates etc. to make everything work. The main difference is that the components for the 'typical' actuator are MUCH bigger, probably used for a larger valve or for higher pressures that need greater forces to...
It is funny, I used to work for Yarway in the 80's and now work for a Fisher rep. The 9300 is an 'ARC', which is a self controlling minimum flow valve. To replace this with a different style valve you will need to add a control loop to the system that measures flow and controls the recirc...
Remember that an orifice is a fixed flow device while the sump requires a variable flow due to changes in temperature. Also that a gate valve is not designed for regulating flow but a simple on/off device. Why not use, depending on pressure and line size, a pilot operated regulator with the...
Considering all of the above, if you have a control valve on the incoming steam sensing the liquid temperature in the tank, and a steam trap on the outlet that has atmospheric discharge, then the condensate that leaves the steam trap (no steam will leave) will be at or near the saturation...
Thrusterpump: The site discourages phone & email postings, to contact us, click on the link below and give my office a call. Ask for Joe.
Joe Lambert
http://www.control-associates.com/
I know sales are not allowed on this forum, and I have contributed many times keeping my salesmanship in check. However I must urge you to give this valve and company another shot, this is a great valve we have used with enormous success in many applications. It is NOT a standard ball valve...
Most pumps have a smaller outlet size than inlet, and both are usually smaller than the piping. As for speed, 1800 rpm seems to be a standard in most HVAC applications, however if you have high head and low flow, the 3600 rpm option will give a much more economical pump and also more efficient...
Why not use an actuated ball type valve rather than a solenoid. Many manufacturers make bubble tight shut-off valves with 100 psig in either direction.
Joe Lambert
http://www.control-associates.com/
I love traps.
I also like thermostatic traps for tracing and most drip trap applications, as long as the subcooling of condensate can be done in the piping and not in the steam line for drip traps.
Since bimetallic traps ARE thermostatic traps, I assume in your question that you are comparing...
We prefer to use bypass globe valves instead of handwheels on control valves. Both will let you run the process manually in case of control valve failure.
However, a handwheel on the control valve often can override the valves failure mode and could lead to safety issues. Also, with a bypass...
We use Trim 5 and Trim 8 in steam gate valves here in NYC as a standard. Where Trim 5 is full stellite and 8 is half stellite. Not all too much price difference, but the standard is Trim 8 for most manufacturers so delivery may be easier. If you need tighter longer lasting shut-off, where a...
Attached is a great report of a steam pipe rupture that happened in NYC this past year. I thought it was written really well, with excellent back-up pictures of a blown pipe that you may be able to use.
Joe Lambert
http://www.control-associates.com/http://www.coned.com/messages/ABSReport.pdf
Talk to your Emerson Process management rep, they know a lot about these systems. We are one but maybe not in your area. Get us a zip code and we can point you in the right direction or go to this map to find one:
http://www.emersonprocess.com/systems/reach/na.htm
Joe Lambert...
There are commercially available systems just for this need. They are sized pretty small, not for the initial fill but to keep the pressure in the system in case of small outflows and pressure drops. Look at attachment of one we have used.
Joe Lambert...
If I understand the question, it sounds like the initial fill of the system, where the city water pressure may be too low to top it off due to the static head. I have seen some contractors use a little pump they temporarily hook up, first letting the city water fill until the max pressure is...
Here in NYC, we use ball valves for tight shut-off on district steam at max 200 psig. 1/4 turn valves are not allowed in this service for fear of opening quickly and causing water hammer or thermal shock. So, we use a multi-turn gear operator on the steam rated ball valves. So, like the...
Interesting this came up, article on sustainability in this months ASHRAE journal. One of the recommendations is to use seamless pipe. If they recommend for HVAC, why not power?
http://mag1.olivesoftware.com/am/welcome/AJL/ASHRAE-07-2008.asp
by the way, I thought this was a well written...
I used to work for a company GESTRA, now part of Flowserve. I no longer work there but that is another story, still like their products.
They make a valve - AK-45 - that does exactly what you are looking for, opens at low pressure and closes on high, used for freeze protection.
check out...
I guess it depends upon exactly the manufacturer and model used, but in general most plug valves I have run into should hold the rated leakage in both directions.
Joe Lambert
http://www.control-associates.com/
