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Hyd. Valve fittings question

J

jfharper

Member
Given the price of hydraulic fluid now a days, I'm thinking its better to fix my leaks then keep buying fluid.

In my rear valve for the 3 pt rams on my mf 205 industrial, there are fitting holes (female) that are 1/2" that have fittings going into them that are 1/2" NPT tapered thread going to female 1/"4 NPT swivel that seal by I think that mechanical seat...the 1/4" hose as an inside bevel.

The questions is, if the female holes on the valve that have the fitting (1/2" NPT tapered thread) cranked into are producing leaks (which they are) could I buy the o-ring boss or o-ring boss face seal fitting which have straight threads thus fixing the leaks with the o-ring instead of the tapered thread cranked down? Are the female holes tapered too or just the fitting that goes into it? Anyone know of these old valves?
 
Can't put a straight thread fitting into a pipe thread. It will fit
but it won't seal. A true male o-ring boss fitting screws into
the female hole and the female has a chamfered bevel on the
top for the o-ring to seat and seal. A pipe female port does
not have this. Take out your old pipe fittings and check for
cracks. Also the fittings just might be loose. Either reuse the
old ones or buy new use a good liquid pipe sealant and put
the correct fittings back in and tighten accordingly.
 
I like Loctite 565 or equivalent. I dont like pipe tape in a
hydraulic application due to the possibility it could get into the
system especially valves/pumps and cause problems.
 

I have to say that the NEW "Gasket Maker" Silicone sealer is Superior to anything I have used lately...
REALLY works well on Fuel pump (Storage) supply lines...
DO NOT try to use "Liquid Teflon" on Fuel Fittings..!!!
Why, using the New Gasket Maker and a Loop of Dental Floss, you can seal about any normal mating surface in an emergency and it WILL Hold well..
Just use a LIGHT coat of Gasket Maker, lay the Floss inside the bolt holes, Lightly tighten, let set for 20-30 minutes and tighten it down...

Ron..
 
Are you sure the treads are NPT sometimes you need an adapter to go to NPT. Cause is they are NPT they arent that hard to seal you must need an adapter to get to NPT.
 
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