Cruisers Forum

  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 15-05-2021, 14:07   #1
Registered User

Join Date: Jan 2021
Posts: 12
Using Seacock of bronze and stainless sheet in ocean

hi - i am about the install a Groco BV seacock in sailboat used on the ocean. The body is bronze, the ball is stainless steel -PTFE seats and seals. Is there any problem or possibility of corrosion because of dissimilar metals ?

tx P
PHK1 is offline   Reply With Quote
Old 15-05-2021, 14:52   #2
Registered User

Join Date: Oct 2019
Location: Kennebunk ME
Boat: Owner built 60í Aluminum Expedition Yacht.
Posts: 1,854
Re: Using Seacock of bronze and stainless sheet in ocean

You donít state hull material bu Iím guessing fiberglass. I have an aluminum hull and Iím removing all my Forespar Marelon seacocks because two are frozen open and there are a number of sailors who have had the handles snap off.
Iím replacing the Forespar with Groco stainless adaptor plates and 316 stainless commercial ball valves. The adaptor plates will be isolated from the 1/2Ē aluminum backing plates which are TIG welded to the hull. Iíll bolt the Groco adaptor plates to the welded plates. Groco adaptor plates let you change the ball valves, or examine them or take them apart without hauling the boat. All you need is a nerf ball . One test I will run is to CeraKote the bore of the ball valve...another, the entire ball...and see if there is any ďcorrosionĒ difference vs non coated or simply greased with Tef-Gel.
I have a custom Bruce King cutter I built 40 years ago which has been at anchor for 25+ years, never pulled out. The seacocks are bronze Apollo with stainless balls. They are a bit stiffer than new, but open and close completely. I havenít seen the need to pull them out or cut them apart.
I find it useful to add a tee above a seacock with a plug facing up. You can clear any obstructions by removing the plug and ramming a stick straight down and out the hull. I only use this for the main engine raw water.
I donít consider thru hull supported valves true seacocks. This type includes TruDesign and Forespar. To me, a seacock is a valve bolted to the hull not a valve which depends on a thru hull for support.
Commercial 316 stainless ball valves are used to shut off some nasty chemicals.
I find Nickel Teflon tape and Tef-Gel nice for stainless pipe threads.
If you are still concerned about mixing metals, you can CeraKote your pieces or Tef-Gel them but I donít think itís needed. Iím only suggesting you use real seacocks not supported ball valves. Iíve been running a DC electric valve on my gen set supply upstream from a seacock and it works well. Simply my opinion? Iím very impressed with Groco products.
Happy trails to you.
Captain Mark and his frightfully spoiled manatee crew.
Manateeman is offline   Reply With Quote
Old 15-05-2021, 15:12   #3
Registered User

Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 4,069
Re: Using Seacock of bronze and stainless sheet in ocean

You won’t have any trouble with the Groco BV seacock. It will outlast the boat.
The new BV seacocks come with a zerk fitting to allow you to grease the ball. The valve should be open or partially closed. When you pump grease into a closed ball valve you just fill the center of the ball.
Retired from Hopkins-Carter Marine Supplies
HopCar 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
Bronze chainplates silicone bronze or aluminum bronze Eastward ho 24 Deck hardware: Rigging, Sails & Hoisting 33 24-01-2018 19:50
[SOLD] Groco Bronze Thru Hull and Seacock woodguy Classifieds Archive 1 08-10-2015 11:36
For Sale: Sailing Books, Bronze WC Seacock JoeFdz Classifieds Archive 2 13-06-2011 13:23
Stainless Bolts on Bronze Seacock duncan_ellison Construction, Maintenance & Refit 23 16-06-2010 16:08

Advertise Here

All times are GMT -7. The time now is 10:26.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.