Delivery valve.

摘要

A delivery valve for location in or adjacent the outlet of a fuel injection pump includes a valve body 11 having a bore 12 and a seating 13 defined at one end of the bore. A valve member 17 includes a head 19 shaped for engagement with the seating under the action of a spring and a tubular portion 18 slidable in the bore. A groove 23 is formed in the tubular portion adjacent the head and a by pass port 24 connects the groove with the interior of the tubular portion. Formed in the tubular portion is an opening 25 and extending from the opening towards the head is a flat 26 which is closed off by the walls of the bore as the head following delivery of fuel is moved into engagement with the seating by the spring.