Waterjet Group

Welcome to the ultimate waterjet forum, WaterjetGroup.com!
This forum will give you access to participate in discussions and attain resources via our vibrant waterjet community . This discussion board is intended for any waterjet user but the majority of the moderators are associates of Flow International Corporation. We will attempt to make this community an unbiased source of information regarding general waterjet topic areas. If you are a registered Flow Waterjet customer and require in-depth product support, please visit FlowParts.com.

Members Login
Username 
 
Password 
    Remember Me  
Waterjet Group -> General Chat & Discussion -> Problem with water pressure on nozzle
Post Info TOPIC: Problem with water pressure on nozzle
Mag


Newbie

Status: Offline
Posts: 3
Date:
Problem with water pressure on nozzle
Permalink  
 

We have an PTV waterjet which is assembeld with H2O parts(now KMT).
Problem is on the pump, normal working oil pressure is 200-220 bar and outgoing water pressure should be 3800 bar but as this problem appeared there is 2800-3000 bar water pressure. At first I thought that there is lekaing somwhere but there is no leaking anywhere. PTV says that they never heared for this problem and they don't know what to do so I'm asking you if you have any sugestion.


__________________
TFabian


Veteran Member

Status: Offline
Posts: 94
Date:
Permalink  
 

Sounds like it is either time for a seal change or there is an issue with the check valve.  Perhaps a bad seat or a hairline crack in it.  With any of these cases you would see oil pressure at normal, no signs of leakage, and loss of output pressure.

__________________
Do not waste today regretting yesterday.
Mag


Newbie

Status: Offline
Posts: 3
Date:
Permalink  
 

I've checked check valves and still nothing, I have only 3,100 Bars. I'm using CHUKAR parts, are they good?

__________________
TFabian


Veteran Member

Status: Offline
Posts: 94
Date:
Permalink  
 

I don't have any expeirence with Chukar parts and don't really have any experience with their quality.  Generally speaking, I would stick with OEM parts for pumps.  It makes less difference on cutting head parts, but at least with Flow, I know that there are alot of metallurgical processes on their pump parts that often get skipped when others make the same parts.

One other thing you may want to check is that the bleed down valve in the pump isn't bleeding water during cutting.  There should be two water drain lines coming out of the pump that usually for to a drain, one for cooling and the other to relieve pressure.  Check the one that relieves the pressure.  It shouldn't have water coming out of it during cutting.  If it does, it may need to be rebuilt.  I have less experience with these pumps, so it may also have an on/off valve in the pump that would perform the same function.

__________________
Do not waste today regretting yesterday.
gzsame


Newbie

Status: Offline
Posts: 2
Date:
Permalink  
 

there are many reasons for pressure loss except leaking, like diamond becoming old,high pressure seal old and etc. You need to check these fittings

We are a waterjet machine manufacturer in China. If anything can help please visit my profile for contact

__________________
Mag


Newbie

Status: Offline
Posts: 3
Date:
Permalink  
 

Problem Is solved. Problem was in the liner filter http://www.ptv.cz/ptv/jnp/en/produkty/nahradni_dily/Sestava_linioveho_filtru/index.html , it was never changed in 5000 hours of working because no one told us that this filter could be the problem.

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Waterjet Group -> General Chat & Discussion -> Problem with water pressure on nozzle
Please note, the views and recommendations expressed by employees of Flow or it's partners on this website do not necessarily represent those of Flow International Corporation. For more information on this site's Terms of Use , please visit the DXF Copyright and Community Guidelines pages.

Important: Do not upload any DXF's or images without permission unless they consist entirely of content you or your company created.

By clicking "Upload file", you are representing that this DXF or image does not violate the WaterjetGroup.com's forum's Terms of Use and that you own all copyrights to this file or have authorization to upload it.