Soft-Start - a flow control valve in the supply line allows adjustment of the air supply into cylinder, hence the speed at which it moves. This gives a degree of "feel" to the system when "inching" equipment, without restricting the exhaust flow from the cylinder but also allowing immediate shut off.
Manual over-ride - this is available at all times. At rest, both pipes to the cylinder are "open to atmosphere", allowing for free movement of the piston, with return to centre when the system is deactivated.
