Patent ID: 7866626

Claim:
A valve apparatus for failsafe control of liquid material passage through a line comprising: a dispensing control unit for in-line coupling, said dispensing control unit including: a housing having an inlet port, an outlet port, and a conduction port extending therebetween for selectively passing the liquid material received from the line therethrough, the housing including a control port offset from said inlet and outlet ports, said control port being configured to direct a flow path of at least a portion of a pressurized fluid stream received thereby; and, a response valve portion disposed in said housing, said response valve portion being reconfigurable between first and second states responsive to the pressurized fluid stream directed thereto by said control port, said response valve portion in said first state sealing said conduction port against passage of the liquid material, and in said second state opening said conduction port for passage of the liquid material therethrough; said response valve portion being resiliently biased to said first state, whereby flow of the liquid material in the line is interrupted in the absence of suitable fluid pressure actuation therefore; wherein said response valve portion includes a deflectable member disposed in said conduction port, said deflectable member having a pair of distension flap structures, said distension flap structures extending in a forward direction in said first state to be conjoined in sealed manner along a separable seam and in said second state distended to separate one from the other along at least a portion of said separable seam for the flow of liquid material in a reverse direction therebetween.