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Thanks Tovmania and gerhardl, We checked all parts and did not find any wear or damage on the sealing couple. Also no yield on the parts. Then we reassemble the valve using the same parts, the valve works again. After that, we drive the valve for 200 cycles, it failed...

Hi, Gentlemen There is a 12 inch class 300 triple offset valve under cycle tests. This is a solid seal ring valve, different from commonly used laminate seal. The valve performs very well with water and gas test when is assembled. However, after 50 cycles, it starts to leak. Then we...

Using the four offset concept, the seal shape changed from oval shape to circular shape. This change makes the seal a circular ring shape instead of ellipse shape with a circle hole. Considering thermal expansion and cold shrinkage, circular shape might generate more uniform shape variation...

Hello, valve experts, Do we need to cryogenic treat valve parts, made of SS316 and SS304 in casting and forging, which will serve at -196 Celsius, before machining? I am worry about phase transition at low temperature: austenite transforms to martensite phase and cause shape changing. Thank...

Many thanks to Peter and BCD.

I have a question on the triple offset butterfly valve torque and hope the experts here can help. Question: why the ETC torque is lower than BTO torque for triple offset butterfly valve products? Many thanks

t1" and t2" are the local BFV neck thickness corresponding to d1' and d2'

In triple offset butterfly valve, the laminate seal will scrubbing the metal seat and make lots of scratches on the surface. The scratches will cause leakage problem and shorten the valve service time. To extend the service life of the valve, we need to increase the anti-wear capability of...

Thanks you so much gerhardl

Hi, all, another question about butterfly valve. How to determine the top works thickness and how to determine butterfly valve body neck length? Thanks in advance Bao2

Thanks gerhardl Tenpenny tenipiper, hsbcn's reply. I agree with all of your ideas. Use API 600 Face to Face dimension to develop the valve.

"Butterfly valve with globe valve type of body" means: the flow regulation part uses butterfly valve disc, while the valve shell uses globe valve's face to face dimension

Hello, Experts, I want to determine the valve body min thickness for butterfly valve with globe valve type of body. The min thickness of the butterfly valve body should follow ASME 16.34 or API600? My understanding is : Face to face: API 600 since the customer asked me to develop butterfly...

Hi, Great valve engineers and experts, I have a question and need your valuable suggestions. I am using the basic equations to calculate the MAST of ball valve stem. However, the calculated results are lower than the test results. The shaft drive end is 2 keyways design. I used the...

Double offset can reduce a little bit of wear between disc and liner compared with single offset but not significant. That is the reason why we have to rely on triple offset design.

I would like to get my answer from you expertise. In ASME 16.34 Section 6.1.3(c) Valve Body Necks The thickness of local valve body neck over distance of L shall be equal to t'. The standard says: the t' value can be obtained from Table 3A. However, Table 3A only gives Tm ( minimum...

Make a drawing and you will find your answer. Good luck.

Torque= force X distance ( the vertical distance between rotational point to the force vector).

The torque definitely will increase. How much the torque is depends on your valve structure design, size, service condition. You can calculate or test the torque. Regards Bao

API 609, API 598 ?? Thanks in advance. Bao2