Pushlok check valves

[Waxman]

Hi. I ordered these:

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

smile.amazon.com

I want them for my gravity wax and soap lines; 1/8" poly lines. The idea was to prevent weep from backfeeding into soap and wax tanks. But they do not work. If I pressurize the valves with air they will flow, but not with gravity. Is there anything that will work to 'check' a gravity flow of wax/soap?

 

[DiamondWash]

John Guest 14SCV | Acetal Push-Fit Check Valve | 1/4 Push

The John Guest 14SCV Check Valve is an acetal 1/4" in-line check valve for plumbing systems up to 150 PSI.

www.kleen-ritecorp.com

 

[PaulLovesJamie]

I think you're looking for a swing valve, it's normally open without requiring pressure, but pressure in the reverse direction closes it. I'm not aware of any push loc swing check valves, I've only seen brass.
I think the solenoid should be preventing back flow from your weep, doublecheck your solenoids.

 

[MEP001]

Hi. I ordered these:

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

smile.amazon.com

I want them for my gravity wax and soap lines; 1/8" poly lines. The idea was to prevent weep from backfeeding into soap and wax tanks. But they do not work. If I pressurize the valves with air they will flow, but not with gravity. Is there anything that will work to 'check' a gravity flow of wax/soap?

If there's an individual solenoid for each soap and wax, just swap the lines so the "IN" goes to the pump. The spring pressure should be enough to keep it from flowing with the solenoid closed. D/H equipment has been that way since the mid-70's.

 

[soapy]

I have used many of the john guest 3/8 OD push lock check valves with great success. I do not have many 1/4 od lines but think the John Guest 1/4 inch valves would work fine.

 

[GoBuckeyes]

Waxman that checks cracking pressure was probably too high. The JG check comes in either 5 lb or 1/3 lb cracking pressure. I would give the 1/3 lb a try and I would guess you'll be good to go.

 

[Waxman]

John Guest 14SCV | Acetal Push-Fit Check Valve | 1/4 Push

The John Guest 14SCV Check Valve is an acetal 1/4" in-line check valve for plumbing systems up to 150 PSI.

www.kleen-ritecorp.com

How do I tell if this is 1/3 lb cracking pressure?

 

[MEP001]

If you can blow through it, it's 1 PSI or less.

 

[Waxman]

I meant how do I tell so I buy the right one

 

[DiamondWash]

John Guest #1/4SCV Specifications

Mfr #: 1/4SCV
Cracking Pressure - Check Valves: 0.300 psi	Pipe or Tube Size - Check Valves: 1/4 in
Item - Check Valves: Check Valve	Mounting Orientation - Check Valves: Horizontal, Vertical
Standards: NSF-61 For Drinking Water, NSF-51 For Food And FDA For Food And Beverage	Full Flow - Valves: Yes
Application - Valves: General Purpose	Mechanism and Body Design: Inline Spring
Connection Type - Check Valves: Push x Push	Spring Material - Check Valves: Stainless Steel
Item: Spring Check Valve	Flow Design: Single
Max. Temp. - Valves: 150 Degrees F	Size: 1/4"
Body Material: Acetal Resin Copolymer	Max. Pressure: 150 psi
Sub-Category: Acetal Resin Copolymer	Cracking Pressure: 0.3 psi
Seat Material - Check Valves: EPDM	Max. Steam Pressure - Valves: Not Rated
The material of Construction: Acetal Resin Copolymer	Connection Type: Push
Body Material - Valves: Acetal Resin Copolymer	Min. Temp. - Valves: 33 Degrees F
Max. Temp.: 167 Degrees F	Max. Water Pressure - Valves: 150 psi
Max. Water Pressure: 150 psi	Seal Material - Check Valves: EPDM
Country of Origin (subject to change): United Kingdom

 

[mjwalsh]

The .3 cracking psi should be close enough if you are targeting 1/3of a psi. If not ... I wonder how many other brands of "tube push to connects" are available via an internet search?

Waxman, I am not sure what the cracking pressure specs on other brands besides JG but it might be worth looking into if they include specs with their information. Be sure & share if you take the time & effort ... like Steve did for JG.

On a side note ... just to share our "tube push to connects" in general" experiences ... we have had fewer "tube push to connects" problems with the plastic JG fitting ends than we seemed to have had when we used the more brass Parker. Others' experiences may differ though.

 

[CarWashBoy]

If there's an individual solenoid for each soap and wax, just swap the lines so the "IN" goes to the pump. The spring pressure should be enough to keep it from flowing with the solenoid closed. D/H equipment has been that way since the mid-70's.

The .3 cracking psi should be close enough if you are targeting 1/3of a psi. If not ... I wonder how many other brands of "tube push to connects" are available via an internet search?

Waxman, I am not sure what the cracking pressure specs on other brands besides JG but it might be worth looking into if they include specs with their information. Be sure & share if you take the time & effort ... like Steve did for JG.

On a side note ... just to share our "tube push to connects" in general" experiences ... we have had fewer "tube push to connects" problems with the plastic JG fitting ends than we seemed to have had when we used the more brass Parker. Others' experiences may differ though.

Hi. I ordered these:

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

PureSec 2020 Straight Check Valve 1/4-inch Tube O.D.Push to Connect Plastic valve for RODI System(5 Pack) - - Amazon.com

smile.amazon.com

I want them for my gravity wax and soap lines; 1/8" poly lines. The idea was to prevent weep from backfeeding into soap and wax tanks. But they do not work. If I pressurize the valves with air they will flow, but not with gravity. Is there anything that will work to 'check' a gravity flow of wax/soap?

What is the cracking pressure of the ones from Amazon? I need low cracking pressure..
Thank You..

 

[MEP001]

What is the cracking pressure of the ones from Amazon? I need low cracking pressure..
Thank You..

One of the answers on the Amazon page says 2 PSI.

 

[CarWashBoy]

Thanks.. I will it a shot..
Thanks again,
Doug