Vacuum Regulator

[Bricklayer]

Was looking at making a vac regulator from a brass swing valve and stubble across this at grainger
I've seen the same vac regulators on small portable dairy milking machines.
My pump has a 1" vac inlet. This vac regulator is only 3/4 but it's $19.99. Jumping up to the 1" is $79.99. Huge difference. I'm going to try using the 3/4" and if it doesn't work I'll put 2 on. Still cheaper then the 1"

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Relief pressure adjustable from 0 to 30" Hg
3/4" male NPT threaded inlet connection
Brass construction and stainless steel spring for corrosion resistance
Proportional relief valve for variable opening rate

[Thompson's Tree Farm]

Is there a reason you need to limit your vacuum?

[maple maniac65]

The 1 inch regulator like pictured can be bought for 29.99. I bought mine through zorro

[Bricklayer]

Is there a reason you need to limit your vacuum?

Reason I need a regulator is because pump will be started early in morning before thaw and pump seems to run the coolest at 23-24" hg so I'd like to keep it from burning up. It's on a gas motor with 12v fan blowing on it.
Running a bender releaser also. Don't think the bender would handle 27-28" that the pump pulls with no regulator.

Looked at zoro.
They are a little more expensive then $29.99
https://www.zoro.com/cdi-control-dev...13/i/G2220093/

[maple flats]

On one pump I use 3 of those 3/4" regulators. That pump is on a vacuum tank and I hold the vac to 19". Then about 60-65% of the taps are on 3/16 and those taps get max or near max vacuum.
Before next season I've designed a method to add a releaser and will then be able to let the pump make 24-25", it's on an Alamo with after market oilers, don't trust it to try more than that.

[maple maniac65]

Reason I need a regulator is because pump will be started early in morning before thaw and pump seems to run the coolest at 23-24" hg so I'd like to keep it from burning up. It's on a gas motor with 12v fan blowing on it.
Running a bender releaser also. Don't think the bender would handle 27-28" that the pump pulls with no regulator.

Looked at zoro.
They are a little more expensive then $29.99
https://www.zoro.com/cdi-control-dev...13/i/G2220093/

I see the price skyrocketed since I bought 2 of them. Ouch

[Bricklayer]

Will I be ok with one 3/4" regulator or should I use 2?

[BreezyHill]

On a 73 you should only need one as long as the orfice is 1/8" or larger.

[Bricklayer]

I'm sure it is but I will double check when I pick it up this week.

[WESTMAPLES]

the bender will handle itself fine with as much vac you can put to it, i made my own reliefs with a pipe cap, rubber wiring gromet , 1/4 in X 3 in bolt with nut, and a light duty pushing spring. drill the center of the cap, put the proper size rubber gromet in the hole, put the bolt thru the gromet hole, then put the spring over the bolt with nut to adjust the spring pressure and there you go . mine is set by tightening or loosening the nut , mine sucks in drawing outside air in at 1 hg before max deadhead vac, my pumps draw small amount of cfm, so very little relief breathing is needed with frozen lines.