Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1994-04-08
1995-08-22
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137494, F16K 1710
Patent
active
054430909
ABSTRACT:
A pilot actuator and a pilot actuated tank vent valve that comprises: (a) a vent valve body having a pallet which seats on a nozzle to seal the valve; (b) a pallet actuator mounted on the vent valve body and mechanically linked to the pallet, the upper surface of the pallet actuator being in fluid communication with the pressure in the tank through; (c) a pilot valve mounted on the diaphragm actuator and having (1) a spring loaded sensing actuator, (2) a spindle connected to and operated by the sensing actuator, (3) an inlet port in fluid communication with the pressure in the tank, (4) a first passageway for communicating the pressure from the inlet port to the pallet actuator (5) a second passageway for communicating the pressure from the inlet port to the under side of the sensing actuator and (6) a seating mechanism connected to the spindle for sealing an opening between the first passageway and an outlet port, the first passageway being offset from the inlet port and preferably laterally to the second passageway such that any fluid flowing through the inlet port and along the second passageway must pass the opening of the first passageway. The pilot actuated tank vent valve fails in the open position because the passageway from the pilot inlet to the vent valve actuator is offset from the pilot inlet such that fluid passing to the sensing diaphragm of the pilot must pass the opening to the passageway to the vent valve actuator such that if the sensing diaphragm ruptures the flow through the rupture will cause a decrease in pressure on the vent valve actuator diaphragm allowing the vent to open. Additionally, the pilot spindle is terminated in a ball and socket or other self aligning arrangement so that the valve will still seat if the spindle is slightly misaligned.
REFERENCES:
patent: 3075544 (1963-01-01), Heideman
patent: 3583432 (1971-06-01), Powell
patent: 4368872 (1983-01-01), Machat
patent: 4445531 (1984-05-01), Powell
patent: 5163471 (1992-11-01), Powell
patent: 5249593 (1993-10-01), Higgins
Loose Leaf Catalogue Pages of Anderson, Greenwood & Co. Catalog 3-1900-89 & 3-9000-89, Nov. & Dec. 1989 (Marked as Exhibit A, A2, A3, A4, A5, A6 and A7).
Loose Leaf Catalogue Pages of The Protectoseal Company 1990, 1985 (marked as Exhibit B, B2, B3, B4, B5, B6 and B7).
Loose Leaf Catalogue Pages of Groth Corporation 1988 (Marked as Exhibit C, C2, C3, C4, C5, C6, C7, C8 and C9).
Johnson Kenneth H.
Nilson Robert G.
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