A pressure responsive driver couples a reciprocating motor output to a reciprocable piston of a double-acting pump. In one embodiment, the driver comprises a single spring and in another a pair of springs, which transfer reciprocation forces of the motor output to the piston to reciprocate the piston...http://www.google.fr/patents/US5004403?utm_source=gb-gplus-shareBrevet US5004403 - Pressure responsive drivers for reciprocating pump and method
Pressure responsive drivers for reciprocating pump and method
