Dual rate valve assembly

Details Dual rate valve assembly Dual rate valve assembly

1974-07-22

1976-04-27

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Compulsory cut-off after flow period

303 40, F16K 2116

Patent

active

039529932

ABSTRACT:
A valve assembly in an air brake truck system which meets minimum response time specifications required by authorities and the maximum response rate required by the wheel lock control system for efficient operation. The valve assembly varies the effective orifice size between the air supply inlet and the outlet to the relay valve. The high minimum specified rate is provided for a short period of time for initial response and the lower maximum rate for efficient operation is provided for the remainder of the stop. The valve assembly has a timing section and a variable orifice section. An initially effective large orifice area is provided by moving the valve from its rest or low rate position with an initial application of control pressure, and passing control pressure through a timing orifice to counterbalance the initially applied pressure in a desired short period of time, thereby permitting the valve to return to its first position which establishes a smaller effective orifice area through which the supply pressure flows. The valve is balanced by suitable balance ports and areas so that the operating conditions of the variable orifice section do not affect the operation of the timing section.

REFERENCES:
patent: 1115244 (1914-10-01), Reynolds
patent: 1885363 (1932-11-01), Leitner
patent: 2783020 (1957-02-01), Kleczek
patent: 3099282 (1963-07-01), Miller et al.
patent: 3357255 (1967-12-01), Reynolds
patent: 3648968 (1972-03-01), Reid et al.

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