Cable valve

What do you mean by "when cable tension is applied to the valve stem it closes?"

I've never heard of a cable-actuated valve. What's your application? Can it be electrically actuated? Will a ball valve work, regardless of actuation or 'normal' status?

I'm sure something can be put together if what you're looking for doesn't exist, but more information is needed.

Bill

These types of valves are used in commercial fire suppression systems for gas shutoff in restaurants. However those valves are for gas, Normally closed and rated for 5psi. I need one normaly open, rated for 50psi and used for water. Electric is not an option. Ball, gate, butterfly and any other type would work as long as it can satisify the above criteria.

Steve

You say electric is not an option so what pulls on the cable? Is there a control system in place or is this totally manual operation?

Ahhh . . . Like an "Ansul" system, for instance. Now I understand the kind of thing you're looking for.

What about hooking a cable to a hand operated ball valve? Does it have to return to open when tension is released? What flow rate?

http://www.watts.com/pro/_products_sub.asp?catId=64&parCat=221

I have seen cable actuated valves but they were built on site for specific reasons. The one that comes to mind is a ball valve located 15 feet down in a confined space. A spring was installed to keep the valve closed until an operator or maintenance team needed it open at which point they pulled on a handle that was connected to the valve handle via a cable and pulley system.

I

They make chain wheels for the remote opening and closing of valves. Most industrial supply company's have them. They attach to the valve stem. Come in different sizes to match the size if the valve. The 10 lbs pull will depend on the valve you use. Most are for larger valves. Not sure if it fits your application.

How about modifying a valve such as that used in toilet tanks? They actually use the water pressure to aid in opening/closing, so not much force is needed. I think the only problem might be that the flow is not too great with this valve type.

Tom

Looking in other fields: try looking at the back-head of an industrial-sized gas boiler installation. It could be that there is a mechanical fuse arrangement there, which would give a lead as to the style of thing that is needed in this particular case. On some boiler installations there is a thin piece of combustible material, sometimes little better than string(!), that is used to keep the gas supply running to the boiler. If there is a flame fault and the flame escapes from the back of the boiler it burns through the string, releasing the tension in it, and the local gas supply valve shuts under some kind of spring action. The connection between the string and the valve sounds as though it is the sort of thing that is wanted in this case.