Function DC3 - Two check valves with mounting face for size 03 pilot valve
The DC3 cover, provides parallel check functions in pilot control ports X and Z1. The higher of these two pressures is then available at pilot port P to close the insert via the size 03 solenoid operated valve. A second cartridge can be operated simultaneously from pilot port Z2.
The DC3 cover is similar to the type W13 cover but, whereas there is an open transient condition in the shuttle function (type W13), the DC3 design uses two check valves to ensure that no transient loss of pressure in port P can occur during pilot pressure change-over between ports X and Z1. This feature is of benefit in any application where there must be absolutely no risk of the cartridge even momentarily opening during pilot pressure changeover.