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Jboggs, I have a very defined rotation that i need to maintain (90deg) i may be able to find a shelf item but i'm thinking it will need to be custom. If you have some helpful references though i'm all ears. thank you.

Yes the actuator can drive in both directions, but its slow. I need to snap in one direction, hence the spring. I was going to set up a switch with a cam on the shaft to tell the actuator when to stop. There will be an external signal for telling the actuator when to start in either direction...

I'm looking at making a design using an acme thread power screw. the basis of the design is a rotary actuator will slowly turn a shaft at 600 in-lb of torque plus also being turned will be an ACME thread power screw which will be compressing some belleville spring washers. the shaft will have...

Image is a 1/4 model of a cylindrical piece The Fy load = the full load generated by 100% torque on the 8 bolts. I'm using inventor 2020 nastran. The load is on the blue surface. The pressure load is the perpendicular to surface component of the load. I did not include the load parallel to the...

So i'm trying to model the effect of the RTJ Ring on the RTJ groove. I'm using 100% torque value x 2(for safety) x 8 (number of bolts) = force of ring into joint. I modeled the force down onto the 23.5deg angled surface where the ring was hitting and got a stress. Then I thought the program...

So i've showed the PFI ES-3 standard to a few welding shops and the general comment was "Dude, that kinda tight huh?" Is that a reasonable standard to hold shops to? These shops are welding 2" Cl1500 RFF flanges to valve bodies for us. We have had a couple valves come back from customers with...

The certificate lists maximums for most of the other elements so I assume that if those are at or below those maximums the remainder would still be valid, however for the elements Sn (tin), and Ca (Calcium) there is no limit listed. Now the concentrations shown from the ladle for those 2...

The main 4 chemicals that everyone cites for 1018 are all within the specification. But they also list a very large number of other chemicals that when combined equal to less that what those same cites list for Fe, if they list at all. Most just say "Remainder". The cites that do list the...

Well actually (lol can't believe i said that), for the flanges that i deal with mostly, the 1mm on 25cm would be too tight, especially if we are talking about the raised face. Most of the flanges we deal with are 3" and under and most of those are 2". Most of the raised faces i have are well...

Is this the right category for this question? Should I try it in a different place like the "Welding Bonding Fastening" sub forum under "Structural Engineering"?

For "Alignment of facings or ends" it states that they "shall not deviate from the indicated position measured across any diameter more than 3/64" per foot or 1/32 whichever is greater." My question is does this apply to the raised face section or the OD of the flange. For instance, the raised...

I had been using ASME VIII div 2 design by analysis. Thanks to a reply on one of my other posts I was reminded about the elastic perfectly plastic Limit-Load method Section 5.2.3. The valve analysis converged at 2x working pressure which is adequate for our applications. Thank you all for...

TGS4 - Thank you. Thats section pointed me toward the limit load analysis which might be just what the doctor ordered. As in prototyping we are consistently hydrotesting this part to 1.5 working pressure. I'm sure the analysis will reflect the soundness of the part. Thank you.

thank you. I'm doing a valve design analysis and i have an area at an intersecting bore where the von mises is exceding the Pl+Pb <= Spl or 1.5 allowable. I think this area is a secondary stress area that would justify a a larger allowable stress like 2Sa or Sps but i'm a little fuzzy on...

the section states 5.3.3 Secondary Stress The primary plus secondary stress variation, delta Q, for any sequence of test or operating conditions, shall not exceed 3Sm· Is this more than the Pl+Pb for the secondary stress? This seems to say that is Pm + Secondary stress, so... PM + Pl + Pb...

I know double posting is frowned upon, but i'm trying to get the asme guys opinion as well as the api guys opinion. Hoping to get a consensus in the middle somewhere i guess. If these were on the christmas tree i would definitely go with API as that is the spec usually called out for that...

Our company manufactures valves for the oil and gas industry. Our valves usually don't fall into the normal api valve listings as these are throttle valves 5 ksi range using dual orifice discs to control flow (think willis or baker forum or taylor throttle valve). We are gearing up for ISO...

Our company manufactures valves for the oil and gas industry. Our valves usually don't fall into the normal api valve listings as these are throttle valves 5 ksi range using dual orifice discs to control flow (think willis or baker forum or taylor throttle valve). We are gearing up for ISO...

I'm looking for any documents that contain the stress strain curves for ASME A216 WCB. I have the "Atlas of Stress-Strain Curves - Second Edition", and i've looked but i don't see it in there. I could have missed it, like i missed the ketchup bottle in the fridge that was right in front of my...