525 Pressure Regulator

[Instnapp]

Hi All,

Can someone explain how a 525 masoneilan pressure regulator double seated plug operates within the process?
Appreciate your feedback.

Thanks

 

[gerhardl]

The best expert on how a specific mechanical item works is always the producer! (Always search the net for answers, and if you still have problems, please specify and explain in detail when you ask !)

http://www.cashacme.net/files/Models_525_526.pdf

 

[EmmanuelTop]

From the manufacturer's catalog: "The 525 Series regulators are configured for pressure reduction, and the 526 Series is for back-pressure applications. They are also available for differential-pressure applications in multiple configurations that can meet various combinations of capacity, pressure, and temperature requirements."

http://www.powerflo.com.au/files/Masoneilan Condensed catalog.pdf

Based on this description, it looks like the 525 series can be employed in Nitrogen blanketing or fuel gas service, amongst others.

Dejan IVANOVIC
Process Engineer, MSChE

 

[LittleInch]

INstnapp,

maybe it's me, but I don't understand your question.

Are you asking how a double plug regulator works or how it works within your (unknown) process?

Double plug regulators in general have a lower actuator force requirement compared to single plug because the forces on the disc are balanced.

however tight shutoff becomes more difficult if one seat wears more than the other or is not adjusted correctly during commissioning.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Instnapp]

Thanks EmmanuelTop.

LittleInch

Sorry If I had you confused.

My understanding of the 525 regulator is that it controls downstream pressure,so when there is an increase in demand the regulator adjusts itself and opens up to allow more flowrate downstream whereas when there is a decrease in demand the regulator does the opposite by closing and reducing flowrate downstream. For the 526 back pressure regulator, all this does is control the upstream pressure.

For the 525 as attached in my sketch, I have read in the product manual about setting the regulator within the process. Can I be able to benchset this outside the process like in a workshop? I'm thinking and based on what I read that if I turn the adjusting screw on the Actuator/Yoke clockwise, for example a spring range of 15-40 PSI and reg-setting of 20PSI,if I apply air to the top of the actuator and just when the stem starts to move(20 PSI) will be my set point?
This means at 20 PSI in the field during operation the actuator will ONLY have control at the set point 20 PSI? If the pressure gets lower than 20 PSI,the valve starts closing and higher starts opening for a single seated plug 535H?

For a double seated plug 10,000 body series-operates on the same principle but all depends on the configuration of the plug,whether is open on air failure or close on air failure?

Thanks and Appreciate your feedback.

 

[Instnapp]

LittleInch

Please find attached sketch releated to previous posting.

 

[EmmanuelTop]

Now I am the one who is not sure if I understood the questions. Are you asking if the set point can be adjusted remotely, or if the set point can be adjusted in a workshop?

The answer on the first question is - No, the answer on the second question is - Yes.

Mechanical regulators are not controllers - which means that changing the set point remotely (e.g. via DCS or PLC) is not possible. Set point is adjusted mechanically by increasing/decreasing the spring compression force.



Dejan IVANOVIC
Process Engineer, MSChE