Any advice would be greatly appreciated. Do the gate valves have manuals?
Answer Hmmm! Your explanation has confused me and I think we may have a “glossary” problem. Let me give you some definitions and statements (I’m not trying to be a smart aleck, I’m just trying to get us both on the same page). 1. A solenoid valve is actuated by electricity to open or close. Which happens when depends on whether it is ‘normally open’ or ‘normally closed’ before actuation. 2. A pneumatic valve is actuated by compressed air put into at one end of an actuation cylinder. Moving the valve in the ‘other’ direction is either by a return spring or by connecting the compressed air to the other end of the actuation cylinder. 3. Since the forces of atmospheric pressure can be very large on a big diameter valve, most are pneumatically actuated. Solenoid valves are reserved for small diameter vacuum valves. Indeed, while I know of many solenoid actuated foreline valves, I don’t know of any solenoid actuated gate valves. 4. However, connecting compressed air first to one end of a gat
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