Fluid handling – Systems – Dividing into parallel flow paths with recombining
Patent
1988-10-12
1989-05-16
Rivell, John
Fluid handling
Systems
Dividing into parallel flow paths with recombining
251 33, F15B 13042
Patent
active
048300500
ABSTRACT:
A fluid control valve so constructed that when a spool arranged in a valve housing is at its neutral position, a neutral passage communicates with a tank passage, whereas when the spool is changed over, communication therebetween is blocked, to thereby supply fluid in the neutral passage to an actuator. The spool is formed with a first oil communication passage communicating with a parallel passage and a second oil communication passage communicating with the actuator. Also, the spool is provided therein with a sub-spool, which is provided on an outer periphery thereof with a land and an annular groove for selectively carrying out communication between the first oil communication passage and the second oil communication passage depending on its moved position. The sub-spool has one end facing a pilot passage, which communicates at one end with the parallel passage and at the other end thereof through an orifice with an on-off valve. Opening of the on-off valve causes fluid to pass through the orifice, so that pressure loss of the fluid occurs across the orifice to lead to an increase in pressure on an upstream side thereof, resulting in the sub-spool being changed over.
REFERENCES:
patent: 4355565 (1982-10-01), Bianchetta
patent: 4466336 (1984-08-01), Broome et al.
patent: 4579044 (1986-04-01), Johnson
Kayaba Industry Co. Ltd.
Rivell John
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