Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 30-06-2013, 10:49   #1
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Folks,

I'd like your opinions on the utilization of a flanged through hull mated with a ball value vs. the use of a flanged ball valve. I have to replace 9 of them on a boat and the difference in price is staggering. I am wondering just how much safe the single piece is vs. the 2 pieces (and maybe an elbow) mated.

I am only looking at high end bronze equipment from Groco like the BV series with inline bronze ball.

Thanks,

Z
__________________

__________________
zboss is offline   Reply With Quote
Old 30-06-2013, 18:15   #2
Sponsoring Vendor
 
HopCar's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 3,162
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

There is a good discussion of various ways to safely install thru-hull fittings and valves on the Groco website.

Click on Valves and Thru-Hull Fittings Installation

In my opinion it is unsafe to just screw a ball valve onto a thru-hull fitting because of the mismatched threads and because of the thin material thickness of the threaded portion of thru-hull fittings.

The Groco IBVF Flanged adapter eliminates both problems and allows you to change the valve if needed in the future without removing the thru-hull fitting.

If you're trying to save some money, the Groco FBV Series of seacock is a very good value.

I'd appreciate it if you would consider buying the parts you need from me.
Here is a link to Seacocks on my website: Seacocks by Groco and Apollo Conbraco

If you don't see what you need, send me an email, I'll be glad to quote you.
hopcarmarine@yahoo.com
__________________
Hopkins-Carter Marine Supplies & Fishing Tackle
What You Need, at the Price You Want...with Service!
HopCar is offline   Reply With Quote
Old 30-06-2013, 20:55   #3
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

My problem with the Groco FBV valves are the fact that they have a chromed stainless ball valve in contact with a bronze fitting... thus galvanic corrosion. The vessel currently has these and the result is not only that the ball valves have completely disappeared in some cases but the stainless steel handle and connector are also corroding away.
__________________
zboss is offline   Reply With Quote
Old 01-07-2013, 08:16   #4
Sponsoring Vendor
 
HopCar's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 3,162
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Actually it's the BV series that has a stainless steel ball (not chrome plated). The FBV has a chrome plated brass ball. The ball is not in contact with the bronze body in either one of them. The ball rides on the PTFE seals. Corrosion has not been a problem with either in the field. Groco did a recall on the FBV series more than ten years ago when they discovered that the stem wasn't the correct alloy but no problems since. The level of corrosion you describe sounds more like electrolosis caused by a stray current.

The BV is certainly a heavier duty seacock. I like the bronze handle. You can't go wrong with the BV series but they're pricey.

Another seacock to consider is the Apollo. Price wise I think it falls between the FBV and the BV Groco's. I've had them on my boat for more than twenty years and they are still fine.
__________________
Hopkins-Carter Marine Supplies & Fishing Tackle
What You Need, at the Price You Want...with Service!
HopCar is offline   Reply With Quote
Old 01-07-2013, 08:35   #5
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Are these no longer available?
Attached Thumbnails
Click image for larger version

Name:	DSC00496.jpg
Views:	207
Size:	379.4 KB
ID:	63411   Click image for larger version

Name:	DSC00497.jpg
Views:	114
Size:	402.6 KB
ID:	63412  

Click image for larger version

Name:	DSC00498.jpg
Views:	152
Size:	400.5 KB
ID:	63413   Click image for larger version

Name:	DSC00500.jpg
Views:	113
Size:	411.0 KB
ID:	63414  

__________________
Roy M is offline   Reply With Quote
Old 01-07-2013, 11:03   #6
Sponsoring Vendor
 
HopCar's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 3,162
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Roy those Groco SV series seacocks were discontinued twenty years ago. Groco no longer has parts for them. An aftermarket company started making the rubber plugs some years ago but I don't know if they are still in business.

The rubber had a long but limited life and needed to be replaced every so often. They were replaced by the BV series which should outlast the boat.

Here is a link to the service manual for the SV series.
http://www.kp44.org/ftp/GROCO_Seacocks.pdf
__________________
Hopkins-Carter Marine Supplies & Fishing Tackle
What You Need, at the Price You Want...with Service!
HopCar is offline   Reply With Quote
Old 01-07-2013, 15:55   #7
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Thanks, HopCar, I'm glad these things are in good shape so they can last the rest of MY life. Such a good, simple, serviceable product, now replaced by something else. Oh well. I installed them in 1978, and they look the same, only the bronze is greener.
__________________
Roy M is offline   Reply With Quote
Old 01-07-2013, 16:02   #8
Sponsoring Vendor
 
HopCar's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 3,162
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Roy, you can make the rubber last longer if you're careful to not tighten the T-bolt more than you need to. The failure mode is that the rubber extrudes into the openings and prevents the plug from turning. It will eventually happen but over tightening can hurry it along.
__________________
Hopkins-Carter Marine Supplies & Fishing Tackle
What You Need, at the Price You Want...with Service!
HopCar is offline   Reply With Quote
Old 01-07-2013, 16:05   #9
Senior Cruiser

Cruisers Forum Supporter

Join Date: May 2012
Location: Hailing Minny, MN
Boat: Vancouver 27
Posts: 751
Images: 1
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

FWIW, another option if you're in the market for high end: Spartan Seacocks
Seacocks (UL Approved) | Robinhood Marine Center

Not sure if you'll be thrilled about pricing out nine of them though...
__________________
laika is offline   Reply With Quote
Old 01-07-2013, 17:55   #10
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Quote:
Originally Posted by laika View Post
FWIW, another option if you're in the market for high end: Spartan Seacocks
Seacocks (UL Approved) | Robinhood Marine Center

Not sure if you'll be thrilled about pricing out nine of them though...
Those are actually our number one choice but - yes - they are priced right out of our range.

We have decided to go with the 4/5 part solution: mushroom, flange, elbow, seacock, pipe to hose adapter.

The single-piece flange and seacock was just way to expensive and if something went wrong with the one piece it would be a pain to replace.
__________________
zboss is offline   Reply With Quote
Old 02-07-2013, 07:50   #11
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

[QUOTE=

Not sure if you'll be thrilled about pricing out nine of them though...[/QUOTE]

I've only got three on a forty foot boat. One for the head and windlass washdown, one for the engine, and one for the galley sink and reefer pump. If I'd known what I know now, I'd have installed only one, with a manifold. All the discharges are above the waterline, including the holding tank discharge. Wave splash cleans it off.
__________________
Roy M is offline   Reply With Quote
Old 02-07-2013, 08:50   #12
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: 2-Piece Flanged Through-Hull/Value Vs. Flanged Seacock

Quote:
Originally Posted by Roy M View Post
I've only got three on a forty foot boat. One for the head and windlass washdown, one for the engine, and one for the galley sink and reefer pump. If I'd known what I know now, I'd have installed only one, with a manifold. All the discharges are above the waterline, including the holding tank discharge. Wave splash cleans it off.
There are 11 throughhulls on the boat: 2 x cockpit, sink discharge, auto bilge pump, head sink drain, sea water intake for head and deck hose, holding tank discharge, head discharge, shower sump, raw water intake, engine discharge.
__________________

__________________
zboss is offline   Reply With Quote
Reply

Thread Tools
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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:30.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.