a sliding piston having a radially outer stop portion with a forward end, and a radially inner sliding portion connected to the radially outer stop portion by an arm; and

a housing including an outer housing body surrounding the piston, and the housing having a stop surface selectively in contact with the forward end of the radially outer stop portion of the piston to block flow from a housing inlet to a housing outlet, and the radially inner sliding portion slides on a support tube, and the radially inner sliding portion having a bushing formed of a first material having a better wear resistance than a second material forming the radially outer stop portion of the piston, and the second material having a greater resistance to high temperature and pressure than the first material;

wherein the bushing is provided by at least one distinct bushing providing in a groove formed in the radially inner sliding portion of the valve, with the remainder of the sliding portion of the valve formed of a material having a greater resistance to temperature and pressure than the material forming the bushing;

wherein the bushing is force fit into the groove;

wherein the bushing has an end stop axially outward of an axial end of the radially inner sliding portion formed by the second material; and

wherein the first material is a cobalt based alloy including chromium and tungsten, and the second material is a nickel alloy.