Calculating Spring Force for Fluid Control Regulator

In summary, to calculate the spring force needed for a back pressure regulator for fluid control, the back pressure must exceed 3 bar to open the ball valve. The bore diameter of the inlet is 2 mm, which has an area of approximately 3.1 mm2. This means a force of 93 Newtons is required. The flow rate of 82mls/per min is not relevant. A freebody diagram of the sensing element, including poppet and spring, should be applied. The diaphragm element area can be estimated using the average diameter of backing plate and clamped diameters at the body. The poppet area should also be included as it is typically significant. The spring load will determine the cracking pressure and
  • #1
mkelly
1
0
I need to calculate the spring force required to make a back pressure regulator for fluid control the back pressure must exceed 3bar to open the ball valve the flow rate is 82mls/per min. the bore dia of the inlet is 2 mm dia. any help greatly appreciated
 
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  • #2
3 bar is 300000 N/m2 and your bore has an area of approximately 3.1 mm2= .00031 m2 so you are talking about a force of approximately 93 Newtons. The flow rate is irrelevant.
 
  • #3
Apply a freebody diagram to your sensing element, including poppet and spring. Diaphragm element area can be estimated by using the average diameter of backing plate diam and clamped diam at body. Don't forget to include poppet area as this is generally significant. Spring load then determines cracking pressure and 'droop'. You need to then determine valve lift above cracking pressure which produces a flow. Is that what you need? Are you familiar with calculating flow from Cv?
 

1. What is spring force?

Spring force is a type of force that occurs when a compressed or stretched spring returns to its original shape and length. This force is typically measured in units of newtons (N) or pounds (lbs) and is dependent on the stiffness of the spring.

2. Why is spring force important in fluid control regulators?

Spring force is important in fluid control regulators because it helps to maintain a constant pressure within the system. By adjusting the tension of the spring, the force exerted on the fluid can be controlled, allowing for precise regulation of flow rates and pressures.

3. How is spring force calculated for fluid control regulators?

Spring force for fluid control regulators can be calculated using the formula F = kx, where F is the force, k is the spring constant, and x is the displacement of the spring from its original position. The spring constant can be determined by dividing the force applied to the spring by the change in its length.

4. What factors can affect the spring force in a fluid control regulator?

The spring force in a fluid control regulator can be affected by several factors, including the stiffness of the spring, the amount of compression or tension applied to the spring, and the material and size of the spring. Other factors such as temperature and external forces can also impact the spring force.

5. How can the spring force be adjusted in a fluid control regulator?

The spring force in a fluid control regulator can be adjusted by changing the tension or compression of the spring. This can be achieved by manually adjusting the position of the spring or by using a control mechanism, such as a screw or knob, to change the tension. The spring itself can also be replaced with one of a different stiffness to alter the spring force.

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