Hydraulically synchronized pumps where the hydraulic motor of the master pump hydraulically drives the hydraulic motor of the slave pump

A pump system, comprising:

• a first pump for pumping a first component of a mixture, supplied to an inlet of said first pump, out from an outlet of said first pump so as to be dispensed toward a mixer;
• a second pump for pumping a second component of the mixture, supplied to an inlet of said second pump, out from an outlet of said second pump so as to be dispensed toward said mixer;
• a first hydraulic motor operatively connected to said first pump;
• a second hydraulic motor operatively connected to said second pump;
• a hydraulic fluid reservoir tank containing hydraulic fluid, separate and distinct from the first and second components of the mixture being respectively pumped out from said first and second pumps;
• a first two-position valve interposed between said first hydraulic motor and said second hydraulic motor for controlling hydraulic fluid flow into and out from opposite ends of said first hydraulic motor and between said first hydraulic motor and said second hydraulic motor when said first two-position valve is at first and second positions;
• a pump, interposed between said hydraulic fluid reservoir tank and said first two-position valve, for withdrawing the hydraulic fluid from said hydraulic fluid reservoir tank and for pumping the hydraulic fluid toward said first two-position valve;
• and
• a second two-position valve operatively associated with said second hydraulic motor and said second pump for controlling the hydraulic fluid flow into and out from opposite ends of said second hydraulic motor as received from said first hydraulic motor so as to permit said second hydraulic motor to operate said second pump when said second two-position valve is disposed at a first position, and to permit the hydraulic fluid to be conducted out to said hydraulic fluid reservoir tank when said second two-position valve is disposed at a second position;
• wherein a closed circuit hydraulic fluid flow path is defined as a result of the hydraulic fluid being withdrawn from said hydraulic fluid reservoir tank by said pump, said hydraulic fluid being pumped by said pump toward said first hydraulic motor, said first hydraulic motor driving said second hydraulic motor as a result of the hydraulic fluid being conducted from said first hydraulic motor to said second hydraulic motor when said first, two-position valve is disposed at either one of said first and second positions, and said second hydraulic motor outputting the hydraulic fluid back toward said hydraulic fluid reservoir tank when said second two-position valve is disposed at said second position,
• whereby continuous operation of said first and second hydraulic motors permits continuous operation of said first and second pumps for pumping the first and second components of the mixture to be dispensed.