Valve explanation Valve explanation garciaf (Mechanical) (OP) 14 Dec 16 19:56 Here´s my issue: I would like to know what is "A" and "B" in the photo attached. I dont have information (manual) Please help me I'll appreciate your comments. What is the purpose of "A" and "B". http://files.engineering.com/getfile.aspx?folder=0e62fbd2-6e7f-4c84-9ce6-5b RE: Valve explanation pennpiper (Mechanical) 14 Dec 16 21:23 garciaf, Please back the camera up a little so we get more of an overall shot. Sometimes its possible to do all the right things and still get bad results RE: Valve explanation garciaf (Mechanical) (OP) 14 Dec 16 22:01 Here is the image you're aksking thanks for your help. This valve is a ball valve. http://files.engineering.com/getfile.aspx?folder=9450c170-3554-47ad-b9b8-3f RE: Valve explanation pennpiper (Mechanical) 14 Dec 16 22:29 Garciaf,That Valves appears to be a High Pressure Trunnion Ball valve (http://www.jdbv.com/products/forgedtrunnionballval... "A"- This may be for lubrication of the Trunnion(Stem) "B"- This may be for lubrication of the upstream and downstream Seals Sometimes its possible to do all the right things and still get bad results RE: Valve explanation JohnGP (Mechanical) 14 Dec 16 22:52 I agree that "B" connections are injection points for lubrication of the seals, but "A" appears to be a bleed valve for typically checking seat tightness in a double block and bleed valve. The exhaust port is clearly visible. Cheers, John RE: Valve explanation SPDL310 (Mechanical) 15 Dec 16 13:21 I agree with JhonGP A = Bleed valve, and B = injection port. RE: Valve explanation LittleInch (Petroleum) 15 Dec 16 13:22 IMHO, A is a body vent - that's why it has a hole in side of it. Just be careful if you use it - sometimes these screw in to release gas and out to seal - caught me out once as we were gassing up - a fitter had gone through and what he thought has checked tightness of vents and the thing leaked like sieve as soon as we put gas into it! B I think are the lines to inject sealant onto the seal face. find the sectional drawing and all will be revealed. Remember - More details = better answers Also: If you get a response it's polite to respond to it. RE: Valve explanation zdas04 (Mechanical) 15 Dec 16 14:45 Yes "A" is a body bleed. Often there is a recessed Allen screw where the small bolt is, but it does the same thing, loosen the small bolt and a stem comes off a seat and bleeds the valve body through the hole on the big nut. There is also a bump on the big nut (you can see it in the picture on the top face of the nut) to let someone know that it is a bad idea to put a wrench on that part. I've never had the big nut loosen when I operated the bleed valve, but I suppose it could happen. "B" are seal fluid injection ports, not trunnion bearing lubricant (the trunnion bearings are in line with the actuator). David Simpson, PE MuleShoe Engineering In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist RE: Valve explanation hsemus (Petroleum) 15 Dec 16 22:37 those are bleed valves . in some valve manufacturer, they weld this bleed valve are prior to deployment to permanent subsea use.