Combination high-low pilot valve

Fluid handling – Systems – Supply and exhaust

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Details

137458, 13762566, F16K 1100

Patent

active

040846130

ABSTRACT:
A combination high-low pilot valve includes an elongate slide valve in a central bore of the pilot valve biased by a low pressure spring toward an open end of the bore which is in fluid communication with a primary fluid system. A secondary valve member in the bore controls the opening and closing of a high pressure bleed port and is positioned between the elongate slide valve and a high pressure spring in concentric relation to the low pressure spring. The high pressure spring biases the secondary valve member continuously toward the slide valve. The slide valve is spaced longitudinally from the secondary valve member in normal operating position and upon a continued movement after the high pressure is reached contacts the secondary valve member and moves the secondary valve member to a bleed position. The high pressure bleed port is connected directly to the fluid outlet line from the pilot valve mechanism and upon the reaching of a high pressure above the operating range, fluid is bled from the outlet line directly through the high pressure bleed port which is opened by the secondary valve member and by-passes the outlet port which is blocked by the slide valve.

REFERENCES:
patent: 3621881 (1971-11-01), Vicari
patent: 3716074 (1973-02-01), Peters
patent: 3746047 (1973-07-01), Peters
patent: 3863672 (1975-02-01), Theriot et al.
patent: 3943974 (1976-03-01), Connelly et al.
patent: 3977438 (1976-08-01), Muchow
patent: 3996965 (1976-12-01), Peters

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