Patent ID: 6968861

Claim:
A valve apparatus for controlling the discharge of material pumped by a material pump through a discharge hose, said valve apparatus comprising: (a) a casing; (b) a bladder; (c) said bladder being flexible; (d) said casing substantially surrounding said bladder; (e) said bladder encompassing at least a portion of an outer perimeter of the discharge hose; (f) a compressed gas supply; (g) a pneumatic control valve; (h) said pneumatic control valve being in pneumatic connection with said compressed gas supply and said bladder; (i) a quick exhaust valve; (j) said quick exhaust valve being in pneumatic connection with said bladder; (k) a breather vent; (l) said breather vent being in pneumatic connection with said pneumatic control valve; (m) said pneumatic control valve controlling the flow of compressed gas from said compressed gas supply into said bladder, and causing said bladder to expand, such expansion constricting the discharge hose; and (n) said pneumatic control valve further controlling the flow of compressed gas from said bladder, such flow unconstricting the discharge hose.