Control valves come in two sorts: air to open, and air to close. Air to open valves are normally held closed by the spring and require air pressure (a control signal) to open them – they open progressively as the Read more…
Control valves come in two sorts: air to open, and air to close. Air to open valves are normally held closed by the spring and require air pressure (a control signal) to open them – they open progressively as the Read more…