delta T circulator

[in hot water]

Look into a motorized ball valve, they consume power to open and power to close, no power consumption while open. just like a manual valve. They tend to have a higher Cv also with a full port opening. They do need a signal to open and close, they are not spring return. more $$ than a spring return valve of course.

Here is a simple thermostatic zone valve a friend built.

A greenhouse window operator, connected to a ball valve that he wound a spring around. as the room warms, the ball valve closes down. No power to open or close!

hr

 

[Gooserider]

Look into a motorized ball valve, they consume power to open and power to close, no power consumption while open. just like a manual valve. They tend to have a higher Cv also with a full port opening. They do need a signal to open and close, they are not spring return. more $$ than a spring return valve of course.

Here is a simple thermostatic zone valve a friend built.

A greenhouse window operator, connected to a ball valve that he wound a spring around. as the room warms, the ball valve closes down. No power to open or close!

hr

If you had a link or a picture, it didn't come through, but the motorized ball valve does sound like what I had in mind for sure...

Gooserider

 

[julien]

Here you have a very good White Rodgers zone valve,

(broken link removed to http://www.white-rodgers.com/wrdhom/pdfs/instruction_sheets/0037-5422.pdf)

(broken link removed to http://www.white-rodgers.com/wrdhom/common/ptech/hydronic/info_list_zone.htm#1361-102)