Pressure washer with spring-less outlet to inlet bypass

Details Pressure washer with spring-less outlet to inlet bypass Pressure washer with spring-less outlet to inlet bypass

1990-12-26

1992-02-11

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

With system fluid relief or return to supply

239571, 92167, F04B 1700

Patent

active

050869752

ABSTRACT:
A pressure washer for delivering a liquid under high pressure has an inlet conduit connected to a liquid supply and an outlet conduit connected to a spray nozzle which can be operated to control the delivery of liquid through the nozzle. A bypass conduit enables recirculation of the liquid from the outlet conduit to the inlet conduit. A bypass system, disposed between the outlet conduit and the bypass conduit, includes a shuttle valve which moves between first and second positions at which it respectively blocks or opens the liquid path from the outlet conduit to the bypass conduit. The shuttle includes an axial passage from its inlet to its outlet side which passage has a narrowed jet outlet such that, when the liquid flows through the spray nozzle and the outlet conduit, the pressure drop across the shuttle moves the shuttle to the first position, while when the flow out the spray nozzle is stopped or significantly blocked, pressure on the side of the shuttle facing the spray nozzle rises to the level at the inlet side of the shuttle, which moves the shuttle to unblock the bypass conduit. A seal arrangement in the pressure washer pump comprises a pair of seals between each piston and cylinder wall of the pump. One of the seals pivots in response to side to side wobbling of the piston while maintaining the seal.

REFERENCES:
patent: 373072 (1887-11-01), Jarvis
patent: 3524465 (1970-08-01), Sadler
patent: 3529626 (1970-09-01), Geeman
patent: 3606904 (1971-09-01), Taylor
patent: 3855906 (1974-12-01), Mohrenstein-Ert et al.
patent: 4182354 (1980-01-01), Bergstedt
patent: 4324407 (1982-04-01), Upham et al.
patent: 4385690 (1983-05-01), Iverson
patent: 4653339 (1987-03-01), Kamatsu et al.
patent: 4951713 (1990-08-01), Jordan et al.

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