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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...

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...

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

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...

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

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...

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...

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

Material groups in B16.34 seems all for metallic materials. Is there any P/T table for non-metallic material defined in B16.34?

I think it is a designated reference class number. But which standard gives a clear definition of ANSI Class................? Thanks in advance.

Flowseal high performance butterfly valve trims: Seat: RPTFE Disc: 316 Shaft: 17-4PH Body: WCB (ANSI 150CLASS) Is there any risk to use the valve for oil service? Thanks Bao2ye

I have a question for the pressure test equipment capability. If I want to test a valve with 1000 psi shell pressure, can I use test equipment with 1200 psi maximum pressure capability? I heard that the hydrostastic pressure tester shall be 4 times the pressure rating of the valve. Please...

Anybody knows what this design is? What the theory for this design? Thanks

Can anybody tell me what silicon free butterfly valve means? free silicon means: no silicon content in rubber seat? no silicon in paint? no silicon in grease? no silicon in the metal? I heard that silicon free butterfly valve should be used in Auto industry? What is the reason? Thanks

Can anybody tell me what silicon free butterfly valve means? free silicon means: no silicon content in rubber seat? no silicon in paint? no silicon in grease? no silicon in the metal? I heard that silicon free butterfly valve should be used in Auto industry? What is the reason? Thanks

Hello , We got some butterfly valve disc coated with epoxy. After immerge the disc into the water and applied the hydrostatic pressure of 200 psi and put the disc in the water with 200 F, the coating got blisterling problem. Question: It is blistering on the coating surface a failure? After...

For the valve application, some terms confusing me and can anybody please give me some instructions? What does seat pressure rating means for valve product? How the valve manufacturing determine the seat material's pressure-temperature ratings? Thanks

The butterfly valve disc always has an angle when it is seating on the seat. It is impossible to make valve disc zeron degree alignment on the seat. It seems like if we mount the actuator directly on the valve, the valve can not be fully closed. In this case, do we need the actuator has angle...

For double offset soft seat high performance butterfly valve, the seating/unseating torque is different. The torque at the seat upstream positioned is lower than the seat is downsteam positioned. Is this due to the off set of the shaft centerline to the valve? Are most valve used in seat down...