Multi-component foam dispenser with improved flow metering means

A foam dispensing gun for dispensing a stream of foam formed by reacting two streams of foam components together, the gun comprising:

• a body portion, a handle depending from the body portion, a trigger for actuating said gun, a nozzle for dispensing said formed foam from said gun;
• said body portion including an integrally molded valve seat extending transversely therethrough, the valve seat including integrally molded seal passages formed therein and oriented transverse thereto, a spool valve capable of rotation disposed in said valve seat, the spool valve having a pair of flow passages extending therethrough;
• the spool valve operatively engaging said trigger such that movement of said trigger rotates said spool valve within said valve seat;
• said body portion further including a pair of inlet passages defined therein that extend longitudinally there through generally parallel to a longitudinal axis of said gun, whereby said trigger may be selectively moved to rotate said spool valve and bring said spool valve flow passages into communication with said seal passages to thereby define a path for foam components to flow through said spool valve to said nozzle;
• said spool valve flow passages and said seal passages having non-circular cross-sections.

A foam dispensing apparatus for dispensing a foam formed by mixing together two streams of reactive foam components, comprising:

• a body portion in the shape of a gun having a handle extending therefrom for grasping by a user, a pair of inlet material connections for respectively connecting to two sources of reactive foam components, the inlet material connections having bores extending longitudinally therethrough, a valve seat formed in said body portion for receiving a valve member, the valve seat including integrally molded seal passages formed therein and oriented transverse thereto, said body portion having a pair of inlet passages defined therein that include said inlet material connections and extend longitudinally through said body portion between said inlet material connections and said valve seat, said body portion further including a pair of exit passages formed therein and spaced apart from and in opposition to said seat passages and aligned therewith, said exit passages in communication with a dispensing nozzle;
• a spool valve disposed in said valve seat having a solid body portion and two flow passages formed therein extending through said solid body portion, the spool valve being rotatable in said valve seat and a trigger that is operatively connected to said spool valve, the trigger extending down from said body portion and being spaced apart therefrom, whereby, when a user of said dispenser squeezes said trigger toward said handle, said spool valve passages are bought into communication with said seal passages, thereby defining two paths so that foam components can travel from said inlet material connections to said nozzle;
• and,
• said spool valve passages having circular cross-sections and said seal passages having non-circular cross-sections.