Is this a Back Pressure Regulator? 2

[Iomcube]

I cannot understand is it just a pilot operated SOV or a Pressure Regulator. If it is SOV I simply cannot adjust back pressure value, but why there are x2 pressure lines attached to solenoid?

ref:

https://www.kunag.com/index.php/product/index/g/e/id/5400.html

 

[LittleInch]

Looks like a pilot operated on off valve to me.

The second line is somewhere for the actuating fluid to go when the valve opens is my guess.



Remember - More details = better answers
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[1503-44]

Solenoid operated devices are either 1, or 0, on or off. There are no intermediate positions.
This one seems to be normally valve open, closing with an energized coil.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[MJCronin]

https://v-flowsolutions.co.uk/solenoid-valves/solenoid-valves/large-orifice-solenoid-valves/

MJCronin
Sr. Process Engineer

 

[LittleInch]

Look up how these valves work. Basically you need to connect the two sides of the valve diaphragm for the valve to open and then disconnect the two for it to close. Hence two pipes to to either side of the valve.

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

 

[Iomcube]

@ MJCronin (Mechanical)
@ LittleInch (Petroleum)

Thanks for the answers but pardon me I still don't understand the mechanism. I mean how & when this valve can be used?


In this brochure what does these x2 statements mean?

- diaphragm solenoid valves are 2/2 way normally closed and pilot operated
- Minimum operating differential pressure 1 and 1,5 bar

ref:

https://v-flowsolutions.co.uk/wp-content/uploads/2019/01/s1070-and-s1080-catalogue-4824-d.pdf

 

[Snickster]

From what it looks like the valve is a solenoid actuated diaphram on-off full port valve. The following link shows the diaphram in a manually operated valve:

https://v-flowsolutions.co.uk/wp-content/uploads/2014/08/VF-ART-520-530-10-14-Inch.pdf

As can be seen in the diagram in the attached data sheet when the diaphram is in the full up position the flow path is full flow through the valve. The manual operator pushes the diaphragm "compressor" down over the ports to close the valve.

In an automatic solenoid actuated valve the compressor of the manual operator is replace with the upstream pressure that closes the valve diaphram against the openings of the upstream and downstream ports. This is due to upstream pressure forcing the diaphram down. Although the upstream pressure is just equalized with the upstream piping side of the valve, the upstream pressure applied to the diaphram is greater than the downstream piping side so there is a net force pushing the diaphram down over the outlet port and valve remains closed.

The valve closes by closing the solenoid valve so that the upstream pressure cannot bleed into the downstream side and is applied to the top of the diaphram. To open the valve the solenoid valve opens to allow flow from upstream to downstream side to bleed of the diaphragm. although still exposed to upstream pressure there enough pressure drop in tubing such that there is not enough force to close the diaphram.

The valve is used to provide a large diameter full flow solenoid operated valve by using the solenoid valve indirectly to operate the diaphram valve since solenoids connected directly to valves are usually low flow and small diameter solenoid valves.

The reference to 1 and 1.5 bar refers to the two maximum allowable minimum inlet pressure ranges of the valves as noted in the tables.

I believe the 2/2 way refers to the fact that the valve is 2-way (not 3-way) and can flow in both directions. Normally closed I believe indicates that when solenoid valve is de-energized the solenoid valve port is spring loaded closed to keep full inlet pressure on top of diaphram with port to outlet sice of solenoid valve closed. When solenoid is energized the port of the solenoid valve opens against the spring to allow flow in control tubing from upstream to downstream to bleed of the diaphragm.

 

[Snickster]

If you want a back pressure regulating valve see the following link:

https://www.cla-val.com/waterworks/pressure-control-valves/pressure-relief-valves

 

[Iomcube]

@ Snickster (Mechanical)
Thanks for the comprehensive reply. I now understand it. Thanks for the time