초록 ▼

A combination vent valve/purge valve apparatus (10) for an automotive fuel vapor recovery system canister (14) comprises a purge valve (26) and a vent valve (16) in a single housing. When open, the vent valve (16) allows outside air to enter the canister (14). The purge valve (26), when open, allows

A combination vent valve/purge valve apparatus (10) for an automotive fuel vapor recovery system canister (14) comprises a purge valve (26) and a vent valve (16) in a single housing. When open, the vent valve (16) allows outside air to enter the canister (14). The purge valve (26), when open, allows fuel vapor to flow from the canister (14) into a vacuum source (12). A gas channel (28, 130, 168) extends between a vent chamber (18) within the vent valve (16) and a purge chamber (28) within the purge valve (26). When the purge valve (26) is open and a purge plunger (86) within the purge chamber (28) is positioned away from the gas channel (28, 130, 168), the manifold vacuum draws air from one side of a diaphragm (126) within the vent chamber (18) drawing the diaphragm (126) and a vent plunger (152) downward against a spring to close the vent valve (16). When the purge plunger (86) is positioned to block the gas channel (28, 130, 168), the spring forces the vent plunger (152) upward to open the vent valve (16). Therefore, a single actuator (36) is able to directly control purge closure position and to indirectly control vent closure position to either purge the canister (14) or evacuate the canister (14) to prepare for a leak check.

대표청구항 ▼

[ I claim:] [1.] In a valve apparatus (10) comprising:a master valve (26) including a master valve closure (34) movable to a shut position in which the master valve closure (34) prevents fluids from flowing through the master valve (26), the master valve closure (34) additionally movable to at least

[ I claim:] [1.] In a valve apparatus (10) comprising:a master valve (26) including a master valve closure (34) movable to a shut position in which the master valve closure (34) prevents fluids from flowing through the master valve (26), the master valve closure (34) additionally movable to at least one open position in which the master valve closure (34) allows fluids to flow through the master valve (26);a slave valve (16) including a slave valve closure (24) movable to a closed position in which the slave valve closure (24) prevents fluids from flowing through the slave valve (16), the slave valve closure (24) being additionally movable to an open position in which the slave valve closure (24) allows fluids to flow through the slave valve (16);an actuator (36) operably connected to the master valve closure (34) to move the master valve closure (34) between the shut and open positions; the improvement comprising:the slave valve (16) coupled to the master valve (26) so that master valve closure position controls slave valve closure position.