• y2j
In summary, a fluid can be transformed into a proportioning valve by using a hole through the piston and a metering valve at the inlet, which is similar to how brake systems work. A hand valve can also reduce pressure from 5 bar to 1 bar, but a regulator is needed to maintain a constant output pressure regardless of the input pressure. If the hand valve is gradually closed, the output pressure and flow will also decrease gradually.
y2j
if one want to reduce pressure from high pressure receiver to low pressure receiver for example in the range of (0 to 10 bar) what he must to do?
any valve can use it for this task?

Is this what you need?
http://www.hydroprocess.fr/images/amplification-pression.jpg​

If you need to keep the same fluid on both side, it can be transformed into a proportioning valve by putting a hole through the piston and a metering valve at the inlet (in orange) like this:

Every time P2 increases, it pushes the piston and opens the metering valve. As the pressure P1 builds up, it moves the piston back and closes the metering valve. A greater P2 needs to be created to open it again and increase P1 again (which is always smaller than P2 according to the diameter ratio). Brake systems use a similar valve, except that there is a spring acting on the piston (in the white zone) such that the pressure ratio is 1:1 up to a threshold pressure and then the proportioning starts once P1 X S1 is greater than P2 X s2 plus the spring force, which give an output as shown below (the valve shown can adjust the spring preload with the lever and thus change the threshold pressure):

Last edited by a moderator:
y2j
thanks
if I use a hand valve it could reduce pressure from (5 bar) to (1bar) (hand valve only not contain a spring regulator)?
Is this true ?

http://www.advancevalves.com/large-size-balancing-valve.aspx. A regulator keeps a constant output pressure no matter the input pressure as shown below.

y2j
OK my sir thanks again
Is hand valve can yield this pressure drop (5bar ) to (1bar) if the outlet flow is reduced to a very small amount comparing with that at inlet?

If you close the valve completely, you can reduce the output pressure to zero!

y2j
if closing the valve occurs gradually what happen ?

The output pressure (and flow) reduces gradually.

y2j

## What is the purpose of reducing pressure from a high pressure receiver to a low pressure receiver?

The purpose of reducing pressure from a high pressure receiver to a low pressure receiver is to allow for a controlled flow of gas or liquid between the two receivers. This helps to prevent damage to equipment and maintain safe operating conditions.

## What are the potential risks of not reducing pressure from a high pressure receiver to a low pressure receiver?

If pressure is not reduced between the two receivers, it can lead to equipment failure, leaks, and potential hazards to personnel. It can also cause an uncontrolled flow of gas or liquid, which can damage the receivers and surrounding equipment.

## How is pressure reduced between a high pressure receiver and a low pressure receiver?

Pressure can be reduced by using a pressure reducing valve, which is a mechanical device that controls the flow and reduces the pressure of the gas or liquid passing through it. The valve can be adjusted to maintain a specific pressure between the two receivers.

## What factors should be considered when selecting a pressure reducing valve for this process?

When selecting a pressure reducing valve, factors such as the type of gas or liquid being transferred, the desired pressure range, and the flow rate should be considered. It is also important to choose a valve that is compatible with the materials and conditions of the receivers.

## How can the effectiveness of the pressure reducing process be monitored?

The effectiveness of the pressure reducing process can be monitored by regularly checking the pressure readings at both the high pressure and low pressure receivers. Any significant changes in pressure could indicate a problem with the reducing valve or other components in the system.

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