cap 5cp2120 or 310 cap shooting off head????

[jack954]

i had water coming out of one of the top valve caps. found the valve on the floor but couldn’t find the cap. i put another cap on then started the pump right there at the pump stand and the cap shot up to the ceiling like a bullet. that has happened before on a different pump only because I had the check valve on backwards. This pump is only four years old, has anyone ever had this problem or no why it would do that?

 

[Keno]

stripped threads?

 

[jack954]

they definitely are now that the caps were forced out, but how would the first one shoot out if the cap was tight and only 4 years old?
seems very random and odd

 

[jack954]

so the check valve guts came apart and lodged perfectly into this nipple

 

[Fatboy769]

I’m curious as to why you’re using a check valve on the discharge side of the pump?

 

[1carwash1]

I’m curious as to why you’re using a check valve on the discharge side of the pump?

Sometimes to stop dripping from the wand when the pump is off

 

[Fatboy769]

Sometimes to stop dripping from the wand when the pump is off

I guess I’ve been fortunate or lucky, but the washes I have owned and the ones I have serviced have never had a check valve on the discharge side of the pump and as long as everything else in the equipment room was functioning properly, I never had an issue with water constantly dripping out of the wand.

 

[Randy]

so the check valve guts came apart and lodged perfectly into this nipple

It looks to me like the check failed and the pressure has to go somewhere, a Cat pump will build a tremendous amount of pressure if it doesn't have anyplace to go. Like Fatboy769 why do you have a check valve on the discharge of the pump, it should an open all the way to the nozzle.

 

[jack954]

it was set up that way when i bought the wash over 20 years ago, i was told i needed it for the weep. i am open to other thoughts if that is incorrect!?

 

[Randy]

it was set up that way when i bought the wash over 20 years ago, i was told i needed it for the weep. i am open to other thoughts if that is incorrect!?

It is incorrect. Coming off of the pump I have a 3/8" brass "T" one leg goes out to the bay the other leg off the "T" I have a 3/8" X 1/4" reducer and a high pressure stainless steel check valve and 1/4" needle valve to adjust the weep water flow. It's been that way for 42 years.

 

[Blanco]

There is no reason for that check valve to be there especially in the direction it is. It is pointless and doing nothing. Get rid to it.

 

[jack954]

thanks for the info!

 

[Blanco]

The only reason I can think of having a check valve there in that direction is if your weep is introduced after it or in the attic and they were trying not have it back flow into your tank. If that is the case thats an easy fix. Put a tee at the end of the pump HP line going out from the top and then a elbow with a ball valve + check valve and tie the weep in there at the bottom of the check valve flowing up to the pump. The check valve will be used to stop the HP water from getting into weep system. The ball valve is for service or in case weep solenoid fails you can temporally close it.

The ball valve is also used when watching someone wash with weep water you close it when they go to put the gun back open it once they get to their car again close it and mess with them for a few minutes to get a good FU laugh until they put money in.