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 drain valve for a compressed air system automatically discharges liquid separated from system air from a container in which the separated liquid is trapped when the trapped liquid activates the drain valve. A spring biases the valve element of the drain valve to an open position to drain the trapped liquid during system shut-down and is positioned in an outlet passage of the container so that the spring is accessible for replacement without dissassembly of the drain valve. A float in the container is responsive to the level of trapped liquid to open communication between the system pressure and a chamber on the upper side of a diaphragm type valve actuator to offset the system pressure in a chamber on the lower side of the valve actuator so that the spring and the pressure on the upper side of the valve actuator acting on the valve element moves the valve element to its open position for discharging the trapped liquid.

Abstract: A drain valve for a compressed air system automatically discharges liquid separated from system air from a container in which the separated liquid is trapped when the trapped liquid activates the drain valve. A spring biases the valve element of the drain valve to an open position to drain the trapped liquid during system shut-down and is positioned in an outlet passage of the container so that the spring is accessible for replacement without disassembly of the drain valve. A float in the container is responsive to the level of trapped liquid to open communication between the system pressure and a chamber on the upper side of a diaphragm type valve actuator to offset the system pressure in a chamber on the lower side of the valve actuator so that the spring and the pressure on the upper side of the valve actuator acting on the valve element moves the valve element to its open position for discharging the trapped liquid.