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for steam service, generally , means metal seat for high temperature and differential pressure (when shutoff). exposed--- same as wetted to process fluid?? some ball valve are single seat ring, which is always wetted (exposed design), but double seat ring ball valves, the body and...

add more to "valveexpert": you should choose 17-4PH HT1150 hardened cage, which is good for high temperature (410 C deg) erosion-corrosion resistance, and also higher strength at high temperature. the seat ring should be solid cobalt/stellite hardened,if you can make the cage seat surface...

no, you can not interchange it. B7M is for sour service. and it is not ok for chloride related corrosion if it is a wetted part. check ASME and NACE codes. Get help and return with helps!!.

Agree to gerhardl. [highlight #3465A4]Combined filter, regulator and water removing before the total system (possibly other places if long lines)[/highlight] 12 tubes venting at same time will draw down the pressure of the header, a regulator will be a good idea. venturi valve needs to be...

GOOD STORY. you did not say the temperature of the water, i guess 20C Deg? choked flow for liquid seems just a range between incipient bubbling and fully vapourization. for the gas choke flow is pretty clear defined as "sonic velocity in that fluid". you are lucky you guys did not test that...

yes, you need a PSV. Get help and return with helps!!.

by the way, oil hand pump is not very good for cold winter like in Canada, a mechanical hand wheel and clutch would be better. Get help and return with helps!!.

there are so many ESD ball valves can be used for your application, thost picked a right one for you. the only issue is that if it is for salty water or other corrosive liquid, trim material has to be carefully selected. Get help and return with helps!!.

i am new on choked flow too, just read a article says you can still control the mass flow when operating at choked flow condition. ...google it! Get help and return with helps!!.

your process data are wrong,,,,, it is not practical to get -14.69psig=-101.36kpag ,,,,,,which is absolute vacuum?????? no machine can make this!!!! and you donot have the temperature, so is the N2 liquid? Get help and return with helps!!.

5/1000" tungsten carbid i think is just good for anti-wearing (mechanical between two surfaces), it is not good enough for anti-cavitation. choke valves always use solid piece of carbid as a sleeve or plug coating for anti-cavitation/erosion-corrosion problems. it is welded on the plug ??? not...

SS316 and SS316L are different on hardness, therefore, a little different on process applications. example, H2S service needs SS316L not SS316. depends on where you are gonna use them. Get help and return with helps!!.

sizing a valve for 2 or 3 phases is really a trouble headache or puzzle, experience is very important, pay double attantion to your process data----never trust too much of your process data. ---my experience told me the process data could be wrong for sizing valves. Get help and return with...

1--- critical flow, choked or not, try FISHER control valve sizing software, it will tell you what condition your valve will work at. cavitation or flashing or not, depends on the process condition, it is just some number that you can estimate. when you choose your valve style or trim style ...

[bigears]Thanks, Gerhardl, I have given you a star on this answer. :) . I guess the cut-off was caused by erosion-corrosion on the cage. FISHER whisper I trim has to be flow-up, which means the flashing or cavatation (caused by water droplets?) on the cage. maybe it will be better if i change...

MACH=1.0, means your valve will work at choked condition. the velocity at valve outlet will be more than 400m/s (depends on the density of fluid), it is just simply too high. working at choked condition means this valve will not change the flow when you try to open/close the valve. suggest you...

thanks for all the comments above. this application is typically steam injection on the oil sand offsite pads (SAGD process). the quality of the steam is always nasty for the control valve. some control valves like FISHER/w whisper I trim has been found cut off by erosion-corrosion which may...

stellite is quite good for the stem, but I guess it is way too expensive for cage and plug. any more suggestions?

forgot the pressure drop for this valve: 500kpa @min@4000kg/h, 2271kpa-d@normal@20000kg/h, 1700kpa-d @ max@23850kg/h thanks folks.

316 with cobalt hard faced trim is good for high temperature and corrosive and wearing service, it depends on the process conditions. I used alot of this kind of trims for high pressure and high temperature steam service. the seat ring and plug is always 316 coated with cobalt. the stem is...