Displacement pump with control valve - has valve cone with collar which creates restrictor and pressure area

摘要

The piston (16) of a flow regulating valve (18) has a pressure limiting valve (21) comprising a valve cone (23) located in a shaft (33). The cone fits against a seat (24) and is activated by a spring (22). A collar (32) is connected to the valve cone (23) to form a restrictor (34), preferably narrow and annular in shape, with the shaft (33). The end of the collar (32) facing the valve cone (23) acts as a pressure surface (A2). ADVANTAGE - Prevents overheating and jamming of the flow regulating piston.