Hydraulic system questions?

[Garek]

Hi guys,

This is my first time on this forum. I wish I knew before about Eng-tips web site. Anyway, I am Engineering operator on a ship and I am learning the steering system. Looking at the manual and the technical drawing, I understand the entire system except 2 components in the system which are the "shuttle valve" and the 2 "Check-Q-Meters".

Let me explain the system more in details:

2 Hydraulic pumps are supplying the system, a main pump and a standbye pump. From the Directional valve, the flow goes to the "Check-Q-Meter" and also the shuttle valve (connected to the return line) . Then after the "Check-Q-Meter" it goes to your 2 steering motors and then the flow goes back to another "check-Q-Meters" and the the shuttle valve again (which is between the supply and the return side) and then back to the directional valve.



Garek
BC, Canada

 

[meintsi]

A shuttle valve is a type of directional control valve which permits a system to operate from either of the two fliud power sources. In you circuit is is probally acting as a safety. In the event that the main pump can no longer supply the power to operate the downstream devices, the shuttle valve will shift to allow fluid to flow from a secondary backup pump.

In other words, a shuttle valve will always select from the highest input pressure and route that flow to the output pory if the valve.

As far as a "Check-Q-Meter" see here:

http://www.boschrexroth.com/BoschRe...obile_Controls/Mobile_Valves/xM_brm_61444.jsp

Remember...
"If you don't use your head,
your going to have to use your feet."

 

[Garek]

Thanks for answer meintsi,

I finally understand. In my case, the shuttle valve is use when the system is in neutral to relieve the load on the pump and send the fluid back to the tank.

And for the 2 check Q-meters, they prevent the motors from uncontrolled movement under overrunning load when in neutral by acting like a check valve.

There is also two pressure relief-anti cavitation valves that serve as a secondary relief feature and prevent the hydraulic motors from cavitation.

Garek
BC, Canada