Sizing Back Pressure Valves
Sizing Back Pressure Valves
(OP)
Hi,
What is the most practical variable to considered when sizing the back pressure valve for the metering pump ?
In most of the cases, the pump process discharge flow is having a bigger size such as 2" port diameter
Given rated flowrates of the pump would allow me to determine max pulsating flow of the back pressure valvr stated in some manufacturer such as Grifco or plasomatic valve.
If based on this parameter the valve selected smaller such as
1. 1" back pressure valve for 2" process discharge pipe.
2.2" back pressure valve for 3" process discharge pipe.
And some I discovered the manufacturer do not manufacture the size matched to the pipe, howver the pulsating flow is sufficient.
Another question, most the curves pulsating flow vs Pressure are based on water,is it important to consider other correction factors such as viscosity and sg to get the correction factors. I have not seen there is such correction factors involved.
Appreciates your advise
What is the most practical variable to considered when sizing the back pressure valve for the metering pump ?
In most of the cases, the pump process discharge flow is having a bigger size such as 2" port diameter
Given rated flowrates of the pump would allow me to determine max pulsating flow of the back pressure valvr stated in some manufacturer such as Grifco or plasomatic valve.
If based on this parameter the valve selected smaller such as
1. 1" back pressure valve for 2" process discharge pipe.
2.2" back pressure valve for 3" process discharge pipe.
And some I discovered the manufacturer do not manufacture the size matched to the pipe, howver the pulsating flow is sufficient.
Another question, most the curves pulsating flow vs Pressure are based on water,is it important to consider other correction factors such as viscosity and sg to get the correction factors. I have not seen there is such correction factors involved.
Appreciates your advise





RE: Sizing Back Pressure Valves
Some questions are best answered by contacting the product supplier directly.
The reason for this is that for any correct valve-dimensioning a large number of details must be known, including in many cases details of the piping layout and all attached equipment, along with full details of all variables of flow and fluid.
At the same geometrical connection size valves of equal type will differ in inner solutions, flow characteristics, and capacity from model to model and producer to producer.
A general answer based on insufficient information may well lead you to a poor or wrong solution.
RE: Sizing Back Pressure Valves
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Sizing Back Pressure Valves
For a plunger or recip pump, a lot depends on pulsation attenuation at the discharge end - if you ask me, I wouldnt push my luck on this option anyway.
RE: Sizing Back Pressure Valves
RE: Sizing Back Pressure Valves
We normally size bassed on pulsating flow as per griffco website
http://www.griffcovalve.com/products/back-pressure...
In most of the time the pump port is larger than the valve despite merting pulsating flow