multivalve

Adjective

 * 1) Having or involving multiple valves (in any context); thus:
 * 2)  Having multiple intake valves and multiple exhaust valves per cylinder (typically two of each instead of one of each).
 * 3)  Having multiple biological valves.
 * 4)  Involving multiple heart valves.
 * 1)  Involving multiple heart valves.

Usage notes
, multivalve is the adjective usually used in reference to internal combustion engines, whereas is the adjective usually used in reference to heart disease.

Noun

 * 1)  A multivalve mollusc.