Pilot valve operated pressure reducing valve

Details Pilot valve operated pressure reducing valve Pilot valve operated pressure reducing valve

1984-06-18

1986-05-27

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91433, F15B 13043

Patent

active

045909687

ABSTRACT:
The invention refers to a pressure reducing valve including a pilot valve. The main piston of the pressure reducing valve allows to selectively connect a load port to either a port connected to a pressure source or to a port connected to the reservoir. The pilot valve is connected to a control pressure line and to the reservoir. The main piston controlled connection to the reservoir opens within the valve housing into a port connecting the pilot valve to the reservoir. This provides for a substantially simplified construction of the valve since there are only two operating ports and a reservoir port. Furthermore, the main piston is engaged by a spring which is capable of becoming activated such that dynamic stresses resulting from a change from high to low pressure values are avoided which vibrations are detrimental in generating pressure peaks as well as pressure breaks.

REFERENCES:
patent: 3286734 (1966-11-01), Hartshorne
patent: 3324890 (1967-06-01), Whitmore et al.
patent: 3486801 (1969-12-01), Frayer
patent: 3727487 (1973-04-01), Forster et al.
patent: 3791408 (1974-02-01), Saitou et al.
patent: 3856047 (1974-12-01), Takayama

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