Kunkle Valve or Spring loaded relief valve?

donaldsodav290

Active Member
Mar 15, 2010
697
34
28
Real Name
Mark Donaldson
Business Location
Canada
Free flow is my choice. 20$ of home depot pvc drilled to whatever HG setting you want. Lay out 150ft of hose and lock the wand down and drill whatever holes on your pvc cap as necessary to get you to 16hg".

Kunkle over spring though if I wanted to spend 300$.
 

pgcleaner

Active Member
Nov 4, 2020
276
55
28
Real Name
Matthew Olive
Free flow is my choice. 20$ of home depot pvc drilled to whatever HG setting you want. Lay out 150ft of hose and lock the wand down and drill whatever holes on your pvc cap as necessary to get you to 16hg".

Kunkle over spring though if I wanted to spend 300$.
Do you have to adjust it for each run depending on the type of carpet? Shaggy carpets don't lock down as much as a Berber.
 

sbsscn

Well-Known Member
Sep 17, 2009
2,863
1,017
113
california
Real Name
Arm Ben
Business Location
United States
I wouldn't mess with vacuum too much, especially if you have an aluminum waste tank. although Kunkle valves raise the relief break point, can still cause stress on the waste tank. Tanks are extremely expensive to repair and replace. Id only consider raising the break point if I have extreme long runs like over 300/350 foot long vac runs
 

pgcleaner

Active Member
Nov 4, 2020
276
55
28
Real Name
Matthew Olive
I wouldn't mess with vacuum too much, especially if you have an aluminum waste tank. although Kunkle valves raise the relief break point, can still cause stress on the waste tank. Tanks are extremely expensive to repair and replace. Id only consider raising the break point if I have extreme long runs like over 300/350 foot long vac runs
Thanks for the advice. I have a SS waste tank. My runs are either 100 or 150, but I sometimes go to 200. The suction is noticeably less with each 50 foot section. Considering using a kunkle to preserve my lift out to longer runs.
 

sbsscn

Well-Known Member
Sep 17, 2009
2,863
1,017
113
california
Real Name
Arm Ben
Business Location
United States
Thanks for the advice. I have a SS waste tank. My runs are either 100 or 150, but I sometimes go to 200. The suction is noticeably less with each 50 foot section. Considering using a kunkle to preserve my lift out to longer runs.

You could check your vacuum and set (calibrate)

If you have a spare vacuum gauge or you could use a autometer vacuum gauge
run your machine full rpm
connect all your hoses and connect to your machine
block vacuum and measure and record your vacuum

it should be within specs

if not make adjustment at vac relief valve

you might want to replace the traditional/standard ring worm stainless steel hose clamps. those will weaken and cause vacuum leaks
I replaced mine with stainless "T" bolt hose clamps found at a marine shop.
"T" bolt hose clamps are far superior that the ring worm traditional type
but "T" bolt hose clamps arent cheap expect to pay between $5.50-7.50 each and be careful not to over tighten them, they have superior clamping power and could warp or crush a port/pipe.

if you are not sure why you have so low vacuum then I suggest doing a vacuum leak test. Smoke test are superior in my opinion.
youll need to inject constant smoke into a vacuum port and look for smoke leaks

if a seal or gasket is leaking, youll see it.

I dont run 4 to the door. I do not believe in it unless im running 350 ft +

if you are mostly running 0-150 constantly then why all of the work, weight, and expense on large hoses, and Fuel ( for us hear its at $6.30 a gal regular) why waste money and time. Setup is a pain whenever dealing with 4 inch hoses, even if its at the first 50 (technically 100 ft ) and then a WYE reducer adaptor. TO me it makes no sense if you do not over saturate the carpet and do thorough dry passes.

I dont have issues with drying and im fine without the 4 to the door. usually the max drying time is 24hrs.
 
Last edited:

sbsscn

Well-Known Member
Sep 17, 2009
2,863
1,017
113
california
Real Name
Arm Ben
Business Location
United States
Thanks for the advice. I have a SS waste tank. My runs are either 100 or 150, but I sometimes go to 200. The suction is noticeably less with each 50 foot section. Considering using a kunkle to preserve my lift out to longer runs.

on my old timbuktoo symphony 454 machine It was all stainless steel. there was no PSI hoses, every line was stainless steel. tank was stainless steel.

I tweaked with the vacuum and did not use gauges to check, I went with feel and the vac release was barely opening until one day when I had finished a job and machine was off as I put everything away I began to notice water on the floor. Eventually I found that the weld had stressed and failed, and then the bottom (tank Floor) cracked at the supports. im pretty sure it was to much vacuum
 

gtech12v

Well-Known Member
Dec 2, 2008
1,574
460
83
California
Real Name
Gerson Anaya
Business Location
United States
Which is better and why?
The Kunkle will hold the set point independent from the hose runs if you have a small blower it will help ,
Do not use the PVC drill hack and set it at 150ft from the machine you will have good vacuum at 150ft only
If you want to use this method use an adjustable 2 1/2 valve that way you can play around with it like a kid with a new toy