A valve cover lock assembly for a pump having a fluid end module can include a ring adapted to couple to the module, an insert comprising a plurality of segments, and a cone adapted to couple with the insert, wherein the ring comprises a first coupler and the insert comprises a second coupler configured to couple with the first coupler, wherein the cone is configured to move one or more of the plurality of segments when the cone is moved, and wherein the first and second couplers are adapted to at least partially resist movement of the insert. A method of locking a valve cover can include coupling a ring to a valve cover opening, disposing an insert comprising a plurality of segments at least partially within the ring, coupling an actuator to the insert, and coupling the insert to the ring.