Down valve for the down speed control of a hydraulic elevator

Details Down valve for the down speed control of a hydraulic elevator Down valve for the down speed control of a hydraulic elevator

1984-04-17

1986-07-22

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 28, 187 68, 13750513, 91443, F15B 13042

Patent

active

046013660

ABSTRACT:
A down valve (1) consists of a sealing spool device (6) which in its closed position separates a pressure chamber (3), which is connected with the elevator hydraulic cylinder (9), from a return flow chamber (5). The sealing spool device (6) includes a sealing plug (32) which seals off the two chambers (3 and 5) and a metering plug (33) which is intended for the connecting of the two chambers (3 and 5). The return flow orifices (51) are governed by a control edge (57). The metering plug (33) is influenced toward a given position relative to the sealing spool (6) by pressure in a positioning chamber (44) against the force of a compensating spring (56) such that the return flow orifices (51) are choked down. The operating pressure present in the pressure chamber (3) is fed through the pressure sensing orifice (46) to the positioning chamber (44).

REFERENCES:
patent: 2737197 (1956-03-01), Jaseph
patent: 2785660 (1957-03-01), Jaseph
patent: 2888909 (1959-06-01), Gratzmuller
patent: 2988060 (1961-06-01), Arbogast et al.
patent: 4153074 (1979-05-01), Risk

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