ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,422,045, issued on Sept. 23.
"Hydraulic directional control valve" was invented by Mohammad Durali (Tehran, Iran), Parastoo Ebrahimi (Tehran, Iran), Maryam Sharifzadeh (Tehran, Iran), Alireza Alem Rajabi (Robat karim, Iran) and Seyed Mahdi Hosseini (Tehran, Iran).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pilot operated hydraulic directional control valve. The hydraulic directional control valve comprises a valve body, a spool, a spring and a control piston. The valve body comprises four top ports and four bottom ports. When a spring force which is applied to a first end of the spool is less than a piston force which is applied to a second end of ...