Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1977-06-16
1979-09-25
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137538, F16K 1506
Patent
active
041687213
ABSTRACT:
An improved pressure control valve which provides equal damping force in both directions of movement of the valve spool and which also provides negative feedback to partially negate fast transients leading to valve instability. The pressure control valve includes a valve body having an inlet chamber and an enlarged adjacent damping chamber. A valve spool is received within the chambers, the spool having a first portion and a second radially outwardly extending portion adjacent the first portion and disposed within the damping chamber. As the valve spool is shifted to an open position fluid will be expelled from the damping chamber through a first orifice, and as the valve spool returns towards its closed position fluid will be expelled through a second orifice, the orifices having cross-sectional areas proportionate to the volume of fluid being expelled so that equal damping will be obtained in either direction of movement of the valve spool. The valve spool is provided with an orifice passageway which permits fluid in the inlet chamber to be in communication with fluid in the damping chamber whereby transient peaks in the inlet may be transmitted to the damping chamber to provide for negative feedback.
REFERENCES:
patent: 1494135 (1924-05-01), Robison
patent: 2323021 (1943-06-01), Ernst
patent: 2506162 (1950-05-01), Metzgar
patent: 2993505 (1961-07-01), Towler
patent: 3029834 (1962-04-01), Vanden Hoek
patent: 3086551 (1963-04-01), Gordon
patent: 3103230 (1963-09-01), Kutsche
patent: 3547559 (1977-12-01), Tittmann
Massey-Ferguson Inc.
Nilson Robert G.
Thompson John C.
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