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**Dave Sutton** · 14th February 2008, 11:56

Quote: (Originally Posted by kwinter)

I'm confused, Dave. In the thread you started http://www.rebreatherworld.com/revo-...nice-pair.html
there is a picture you posted. Isn't that a switching block?

Hmmm......: It's my rEvo's version to gain the functionally of the internal onboard/offboard diluent valve that's on my Mark-15. It's a simple on/off valve, not a 2 port Gas "A" or gas "B" valve, so it's not 'really' a switch block. Or maybe it is.... dunno. I guess it's how we use the term.

Tomorrow I'll be posting photos of a combination Solenoid or ADV isolation valve with integral offboard gas connection as well, on another thread. I suppose you could call this a "switch block" too, although (again) it's a simple on/off valve, not a 3 port ball valve.

Let's define terms: "Switch Block" to me means a block with a valve that has 3 ports, and the possibilities of having either "A" or "B" (and sometimes "off") positions. I differentiate it from a simple on/off valve for my own nomenclatural use. Is the hard mounted 3 way ball valve on the side of a Mark-15 for onboard/offboard diluent selection a switchblock? Maybe it is, and that same function can be done externally on other rigs, so.... I guess you're right.

I think I was addressing the posters questions assuming that he was asking about open circuit gas access controls, in which case all that DrMike and myself wrote in response apply. For intentional diluent switching from onboard to offboard, my answer is that the blocks have value. I just had not toggled to that side of the question. So, Good point!

Studying the "Mother of all Switch Blocks" now for the CIS Mk-5P. Let's see: Active Diluent: ONBOARD/OFF/OFFBOARD. Active 02: ONBOARD/OFF/OFFBOARD. O2 Control: SOLENOID AND MANUAL/SOLENOID ISOLATED/O2 to BOV WITH SOLENOID OFF. Includes manual add valves for 02 and diluent as well, an also has the offboard gas plug-in points.... the funny thing is that it's intuitive, flexable, and compact. Hmmm........... I need to make one of these!

Dave

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14th February 2008, 11:56	#24 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Switching blocks Quote: (Originally Posted by kwinter) I'm confused, Dave. In the thread you started http://www.rebreatherworld.com/revo-...nice-pair.html there is a picture you posted. Isn't that a switching block? Hmmm......: It's my rEvo's version to gain the functionally of the internal onboard/offboard diluent valve that's on my Mark-15. It's a simple on/off valve, not a 2 port Gas "A" or gas "B" valve, so it's not 'really' a switch block. Or maybe it is.... dunno. I guess it's how we use the term. Tomorrow I'll be posting photos of a combination Solenoid or ADV isolation valve with integral offboard gas connection as well, on another thread. I suppose you could call this a "switch block" too, although (again) it's a simple on/off valve, not a 3 port ball valve. Let's define terms: "Switch Block" to me means a block with a valve that has 3 ports, and the possibilities of having either "A" or "B" (and sometimes "off") positions. I differentiate it from a simple on/off valve for my own nomenclatural use. Is the hard mounted 3 way ball valve on the side of a Mark-15 for onboard/offboard diluent selection a switchblock? Maybe it is, and that same function can be done externally on other rigs, so.... I guess you're right. I think I was addressing the posters questions assuming that he was asking about open circuit gas access controls, in which case all that DrMike and myself wrote in response apply. For intentional diluent switching from onboard to offboard, my answer is that the blocks have value. I just had not toggled to that side of the question. So, Good point! Studying the "Mother of all Switch Blocks" now for the CIS Mk-5P. Let's see: Active Diluent: ONBOARD/OFF/OFFBOARD. Active 02: ONBOARD/OFF/OFFBOARD. O2 Control: SOLENOID AND MANUAL/SOLENOID ISOLATED/O2 to BOV WITH SOLENOID OFF. Includes manual add valves for 02 and diluent as well, an also has the offboard gas plug-in points.... the funny thing is that it's intuitive, flexable, and compact. Hmmm........... I need to make one of these! Dave . __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com Last edited by Dave Sutton : 14th February 2008 at 12:05.
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