Patent ID: 6866486

Claim:
A pressure washer, comprising a frame; an engine mounted to said frame; and a pump coupled to said engine, said pump further comprising: a piston assembly including a piston; an eccentric assembly suitable for converting rotary motion of a rotating shaft to rectilinear motion; and a strap for coupling said eccentric assembly and said piston assembly; a pulse hose for absorbing pressure pulsation in the liquid induced by pumping; and a pressure unloader valve including a valve body having a high pressure port and a low pressure port; a ball valve assembly received in the valve body, the ball valve assembly including a ball, a ball seat disposed against the high pressure port, a spring suitable for biasing the ball against the ball seat; and a plug received in the valve body, the plug being threaded into the valve body for controlling the amount of bias placed on the ball by the spring, wherein said strap is suitable for communicating the rectilinear motion of said eccentric assembly to said piston assembly for reciprocating said piston in said cylinder to pump said liquid.