working of solenoid operated relief valve 1

[ISBind]

greetings everyone

can anyone explain me working of solenoid operated relief valve???? (picture of which is attached, valve is marked 18)

i know it is used for cutting off the pump when pressure starts building. but not able to grab the concept how it works???

thanx in advance

Regards

 

[HPost]

It is generally known as a vented relief valve.

The solenoid labelled S5 is used to switch the valve on and off.

When the solenoid is not energised, there can be no pressure at the top of the valve and it will open at a low pressure.

When pressure is required, the solenoid is energised, pressure builds in the top of the valve, holding it closed. The valve just above the relief valve is compensator and it is operated by the rising pressure and works to keep the valve stable.

Pressure will rise until the value of the spring is reached and the valve will open to maintain the set pressure (high pressure)

Turning the solenoid off will cause the pressure to decay on the top of the relief valve, the valve will open (low pressure).

These valves are used to turn the pressure on and off, whilst having the ability to limit pressure at the same time.

I hope this helps...

Adrian

 

[ISBind]

Thanx Adrian

Can u tell the name of valve used as compensator above relief valve???

Regards

 

[ISBind]

If u can explain how this compensator work, that will be really helpful???

 

[HPost]

Have a look at this thread from a while back...its the same sort of valve and will give you more details about how they work...

http://www.eng-tips.com/viewthread.cfm?qid=388816

Cheers

Adrian

Adrian Wright CEng MIMechE
Engineering Specialist
Hydraulic Systems Team
Caterpillar

 

[ISBind]

thanx adrian that was helpful