weld on 3/4 ports where to get?

[*ryan]

upgraded a 3/4 valve
gonna do a 2 stage pump soon
want to change all my working lines to 3/4"

i've been looking for some weld on 3/4 ports but cannot seem to find them

do some of you just use 3/4" black pipe bungs and weld them on?

 

[lfnh]

surpluscenter has weld on flanges.
swagelok has true weld fittings.

 

[*ryan]

The ones on surplus center I saw said they were for the tank only
I'll search for swagelok

 

[nathon918]

sch 80 half couplings... could use standard couplings and just cut them in half too, any plumbing supply house should have or can get them, most hardware stores will only have sch 40 fittings, which aren't rated for the pressure

 

[olyman]

sch 80 half couplings... could use standard couplings and just cut them in half too, any plumbing supply house should have or can get them, most hardware stores will only have sch 40 fittings, which aren't rated for the pressure

which most people dont get.....this be for pressure side,, not return.........

 

[*ryan]

found out grainger has them
rated at 3000 psi
pretty inexpensive too $1.81 each
thank you all

 

[firebrick43]

Do you have the hoses yet. Why not use jic male fittings.

 

[*ryan]

What would be the advantage of using those fittings vs std pipe thread?

 

[firebrick43]

Jic hyd fittings are the standard and available everywhere as opposed to tracking down forged schedule 80 fittings.
Seal easier and connect/unconnected easier without using pipe dope or as much torque. If swivels are needed on hoses there a little cheaper
Pipe fittings are based on inside dimensions for the most part. Jic are outside dimensions of steel tubing. They are measured as a dash number. For example -8 is half inch. So for 3/4 equivalent is -12

http://www.surpluscenter.com/Hydrau...nion/JIC-12M-x-JIC-10M-UNION-9-2403-12-10.axd.

Every farm dealer worth anything or hydraulic shop should have fittings like this.

Cut the dash 10 side off leaving the hex. Sand the plating off the hex and weld on. I prefer Tig or brazing but people have had success with other processes as well. If arc welding put a cap or something over the threads and sealing face to prevent spatter(npt should be plugged to)

 

[nathon918]

Jic hyd fittings are the standard and available everywhere as opposed to tracking down forged schedule 80 fittings.
Seal easier and connect/unconnected easier without using pipe dope or as much torque. If swivels are needed on hoses there a little cheaper
Pipe fittings are based on inside dimensions for the most part. Jic are outside dimensions of steel tubing. They are measured as a dash number. For example -8 is half inch. So for 3/4 equivalent is -12

cylinders with welded on NPT ports use SCH 80 half couplings, they're a normal everyday fitting for pipe fitters/welders...
I wouldn't say JIC is the standard, I mean its popular sure, but so isn't 45 deg. flare, flange, O-ring, BSP...
not trying to be a dick, but I would just use NPT ports on the cylinder, for the $4.00 they cost, it makes it easier to use whatever hose connection you desire...

 

[*ryan]

Ok
well if i was taking it off and on all the time i would say that could be an advantage
seeing how i plan on it going together once and staying together i dont see a reason to swap

right next to all the npt stuff is the jic stuff, so availability isn't an advantage either in my opinion
i know if i need a line in a pinch i can run to TSC and they will have a 3/4 npt line already assembled i can grab and go cheap

 

[nathon918]

Ok
well if i was taking it off and on all the time i would say that could be an advantage
seeing how i plan on it going together once and staying together i dont see a reason to swap

right next to all the npt stuff is the jic stuff, so availability isn't an advantage either in my opinion
i know if i need a line in a pinch i can run to TSC and they will have a 3/4 npt line already assembled i can grab and go cheap

you're going to want a different connection on at least one end of the hose or fitting that the hose is going into... (something with a swivel)
for the price of JIC x NPT male adapters, its well worth using JIC on the entire machine, hose ends cost about the same as NPT, unless you get into sweeping 90's/45's then the cost goes up...

 

[*ryan]

you can get ntp couplers with swivels in them

 

[firebrick43]

Ok
well if i was taking it off and on all the time i would say that could be an advantage
seeing how i plan on it going together once and staying together i dont see a reason to swap

right next to all the npt stuff is the jic stuff, so availability isn't an advantage either in my opinion
i know if i need a line in a pinch i can run to TSC and they will have a 3/4 npt line already assembled i can grab and go cheap

The advantages of each is small and we could argue them till blue in the face. Just giving you another option. Schedule 80 fittings are an hour drive for me. Jic is 5 mins

 

[firebrick43]

you can get ntp couplers with swivels in them

Yes you can. They cost ~4$ more an end from my supplier than a JIC. Non swivel npt can make installing hoses a real b#)$h between two non moveable components.

Didn't realize tsc sold 3/4 hose?

Just an FYI most premade or standard grade hoses above 1/2" diameter are not 3000 psi rated. Most are. 2500 or 2250. So be careful and read the rating before buying.

 

[WoodTick007]

I just purchased some 3/4 inch hydraulic fittings.....cut then to the length I wanted and welded them into position.

 

[steveman12]

Yes you can. They cost ~4$ more an end from my supplier than a JIC. Non swivel npt can make installing hoses a real b#)$h between two non moveable components.

Didn't realize tsc sold 3/4 hose?

Just an FYI most premade or standard grade hoses above 1/2" diameter are not 3000 psi rated. Most are. 2500 or 2250. So be careful and read the rating before buying.

I found some swivel NPSM fittings here, maybe they'll be more affordable?

 

[kevin j]

hydraulic cylinder ports for industrial applications would normally be SAE O-ring boss. Then an adapter goes into that toJIC or face seal or whatever is needed. o-ring boss is a straight thread, seals with an O-ring and does not depend on interference fit like pipe thread does. leak free.