Looking for a steam pressure control valve 1

[jimpower]

We need to isolate and control the pressure of 1500 psig saturated steam supplied to sootblowers in a boiler. Up stream is 1500 psig, saturated with downstream controlled at approximately 380 psig, no desuperheating. Present arrangement is a fully open/close automatic isolating valve with a pressure control valve just downstream. We have poor experience with the isolating valve leaking after a couple of months. What suggestions do you have for a tight shutoff isolating valve that opens with 1500 psig upstream and atmospheric p[ressure downstream?

 

[gerhardl]

If not one of below valvetypes is suitable for your on/off application you might be able to find other types in the Gestra (Flowserve) valve selection.

http://www.flowserve.com/files/Files/Literature/ProductLiterature/FlowControl/Gestra/810750.pdf

http://www.flowserve.com/Products/S...rols/Intermittent-Blowdown-Valve-MPA-47,en_US

 

[rmw]

Copes Vulcan is good at this type of valve too. Once upon a time they not only did valves but soot blowers too, so some of their valve designs are tailored (were tailored) for that type of application.

rmw

 

[rmw]

And, are you trapping your steam line real good right before your isolation valve? I don't know what your operating cycle time is, but if you give your HP steam line enough time, it will cool off producing condensate, so what goes through your isolating valve first thing mignt be a good wad of trapped (or should I say un-trapped) condensate.

rmw

 

[JimCasey]

I gave RMW a star. I once worked for a valve company that made a balanced valve that shut off very tightly. We sold some for sootblowers, but did not police that the customer trapped the line properly.

A sonic slug of condensate does verrrrry bad things to a control valve, and the balancing mechanism cannot cope with transient conditions such as that. There were a lot of omega-shaped buckled valve stems related with that phenomenon.

 

[steamdog]

Condensate removal is important, but so is a good quality valve. We have recommended the Valvetechologies to power plants here in the NY area with excellent success. Be aware, these are not inexpensive.

 

[TenPenny]

Seems to me that back in the day, Yarway and Rockwell Edwards (? I think) were two of the good names in this niche.

 

[JimCasey]

It's a tricky question. Steamdog mention VTI. TenPenny mentioned Edwards. Those are good -for isolation. Usually when the Sootblowers come on they need some modulation. That's where the control valve companies that were mentioned come in.