Jump to content
Aero Precision provides military aviation aftermarket solutions for c-130
Sign in to follow this  
munirabbasi

Hydraulic Fire SOV

Recommended Posts

Hello Hydraulic Mechanic Expertise 

How sixteenth, relief valve of Hyd  Firewall shutoff valve works (at What pressure it relief the hyd and reset at what pressure)

Munir Abbasi

Home of hercules Pakistan

Share this post


Link to post
Share on other sites

I'm sure you know but to clarify the Hyd relief valve and the Firewall shutoff valve are two different valves.

 

The relief valve:

If the hyd pump pressure regulator fails and pressure increases the relief valve opens to bypass fluid (pressure) starting at 3450. if the pressure continues to increase the relief vale will fully open at 3850 and bypass aprox 16 gallons per min. Once pressure decreases the relief valve will close (reset) at 3100.

 

The Firewall shutoff valve is actually two valves both energized closed by the pump switch and/or the fire handle. One valve (supply side) is motor driven and closes slower than the second valve which is on the pressure outlet and is a solenoid valve.   

 

Share this post


Link to post
Share on other sites

So there is a relief valve in the suction shutoff valve on the firewall.  Is that what you are asking about or are you asking about the system relief valve?

System relief valve opens at 3450, full open (flows more than engine pumps) at 3850 and reseats at 3150.

Suction shutoff valve has a relief valve that opens to prevent a rupture in suction line.  opens around 135 psi and reseats around 105.  I would have to 100% double check those two numbers but thats what I remember.

Share this post


Link to post
Share on other sites
On 11/21/2018 at 9:23 PM, hehe said:

So there is a relief valve in the suction shutoff valve on the firewall.  Is that what you are asking about or are you asking about the system relief valve?

System relief valve opens at 3450, full open (flows more than engine pumps) at 3850 and reseats at 3150.

Suction shutoff valve has a relief valve that opens to prevent a rupture in suction line.  opens around 135 psi and reseats around 105.  I would have to 100% double check those two numbers but thats what I remember.

Thanks

Munir Abbasi

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×