Slow starting valve

Details Slow starting valve Slow starting valve

1992-03-31

1995-01-17

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91443, 91447, 137599, F15B 13043

Patent

active

053818288

ABSTRACT:
A valve for slowly starting an actuator includes a block having an inlet port, an outlet port, and a passage providing communication between the inlet and outlet ports. A first valve body is disposed in the passage for selectively opening and closing the passage, and a second valve body is disposed downstream of the first valve body with respect to the passage for selectively opening and closing the passage. A needle valve is disposed in the block parallel to the second valve body between the passage and the outlet port for restricting the fluid under pressure discharged from the outlet port. The second valve body has a passage defined therein and communicating from one end to the other end thereof, and first and second pressure-bearing surfaces on the one and other ends, respectively, the first pressure-bearing surface is wider than the second pressure-bearing surface.

REFERENCES:
patent: Re30403 (1980-09-01), Bitonti
patent: 4596271 (1986-06-01), Brundage

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