Abstract: A seal construction for a pneumatic valve (66) reduces resistance to movement of a stem (76) which directs flow through the valve. The seals (78) (108) are generally "v" shaped in cross section. The seals include heel portions (86) (110) which are supported on supporting surfaces (80) (112). The seals include first lip portions (92) (122) that extend from the heel portions to a surface that is moveable relative to the seal. Second lip portions (98) (128) extend from the heel portion to surfaces that are stationary relative to the seal. Spaces (104) (134) between radially extending projections (102) (132) and spaces (90) (120) between axially extending projections (88) (118) enable fluid entering pressure relief areas (106) (136) to escape to atmosphere. The seal construction avoids seal deformation that would otherwise increase resistance to stem movement.

Abstract: A pilot-operated poppet valve with integral flow control, the latter being adjustable and direction sensitive to provide free or metered flow. Pressure actuated slidable metering seats having integral lip seals are disposed at load ports and are responsive to pressure therein to move relative to adjustable needles between a metering position and a spaced free flow position. The poppet valves include piston seals consisting of cup-shaped elastomeric elements with a central domed bumper structure disposed freely at the piston head.

Abstract: A pneumatic circuit includes a source of fluid pressure 11, a selector valve 12, a control valve 14, and a power cylinder 15. The control valve 14 includes main valves 35 and 45 and a pilot interlock valve 27. The main valves 35 and 45 include a main inlet port 36, a main exhaust port 38, and cylinder ports 37 and 47. The pilot interlock valve 27 includes a pilot inlet port 28, an interlock port 30, and a signal port 29 which communicates with signal chambers 39 and 49. The control valve 14 is mounted on a motor vehicle transmission, and a mechanical actuator 16 moves between an extended position when the transmission is out of the neutral position and a retracted position when the transmission is in the neutral position. When the actuator 16 is in the extended position, the pilot interlock valve 27 is retained in an interlocked position to maintain the pressure condition existing in the signal chambers 39 and 49.

Abstract: A valve selectively supplies air pressure to two pneumatic devices on the transmission housing of a motor vehicle. The selector valve includes a stationary base mounted on the top of the gearshift lever of the vehicle. First and second valve plates are mounted for individual movement between two positions relative to the base to selectively connect and disconnect an air pressure source with the two pneumatic devices. Cooperating engaging surfaces on the first and second valve plates insure proper sequencing of the selector valve by the operator.