Cruisers Forum

Join CruisersForum Today

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 18-11-2016, 00:50   #1
Registered User

Join Date: Feb 2014
Location: Calgary
Posts: 22
Johnson SPX, WD vs. WPS

As far as I can tell the difference between the Johnson WD (wash down) and WPS (water pressure system) is only the settings on the pressure switch. The WD has a cutoff pressure of 70 psi while the WPS cutoff is 41 psi. This means that when you stop the flow of water the WD will charge your pipes and hoses to 70 psi. Unless you have a very large accumulator this 70 psi will immediately dissipate once you open a hose and you will get exactly the same flow that the WPS system would give you. Can anyone offer a reason to pressurize your system to 70 psi when the only time you will experience that pressure is for a fraction of a second? Additionally, after closing the hose valve, it seems to me that the pump will run longer in its most inefficient range thereby wasting power.
The reason I ask is that I need to purchase some of these as washdown pumps and it seems to me that I should buy the WPS with its lower pressure shutoff. If I am wrong, please explain why.
BTW, I know that some of the WD pumps are packaged with strainers, hoses and sprayers but I do not need those. I am only thinking about the pump itself.
got cake is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cockpit Pilot SPX-5 and Hydraulic Pump Possible ? ghaffy Marine Electronics 24 24-04-2015 20:49
Raymarine SPX 5 wheel autopilot drive unit Tide Roller Marine Electronics 9 20-07-2014 20:00
For Sale: Raymarine SPX-5 Wheelpilot Jimbo2010 Classifieds Archive 4 06-06-2013 08:27
For Sale: Raymarine SPX-5 Wheelpilot Corepack For Sale SailingChance Classifieds Archive 1 28-01-2013 15:17
SPX-10 autopilot st70 controller splicing cd30ketch Marine Electronics 2 21-01-2013 10:38

Advertise Here

All times are GMT -7. The time now is 17:10.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.