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JL Seagull and all, I'v asked Orbit for the tightness of the other side. The answer is that it depends on the force acted on the actuator, though they don't recommend to try that. But how to deal with the positioner requirement? Linde only gave their requirement, but would not tell me which...

mbeychok: Thank you for your reply. Now, I got the idea that for the ideal gas, they are same thing,right?

Hi all, That's a small question but really make me confused in the control valve calculation. Could "isentropic exponent" be treated same as "specific heat ratio" in control vavle calculation? Thanks

Montemayor: Thank you very much for your reply. The Orbit valve is "rising stem" type which have an " orbit" in the stem to guide the valve rotate. And the sealing face of the ball and seat is only in one side, that's why there is a flow direction "arrow" on the valve body. Also, I'v...

Dear expert, I have the following question on which need your help. Background: The adsorption towers are used for the SYNGAS (hydrogen) purification before it goes to COLD BOX. The licenser is Linde Engineering. My interest is in “the valves type selection used for the adsorption sequence...