US 12,422,045 B2
Hydraulic directional control valve
Mohammad Durali, Tehran (IR); Parastoo Ebrahimi, Tehran (IR); Maryam Sharifzadeh, Tehran (IR); Alireza Alem Rajabi, Robat karim (IR); and Seyed Mahdi Hosseini, Tehran (IR)
Filed by Mohammad Durali, Tehran (IR); Parastoo Ebrahimi, Tehran (IR); Maryam Sharifzadeh, Tehran (IR); Alireza Alem Rajabi, Robat karim (IR); and Seyed Mahdi Hosseini, Tehran (IR)
Filed on Jul. 4, 2023, as Appl. No. 18/346,830.
Application 18/346,830 is a continuation in part of application No. PCT/IB2022/050033, filed on Jan. 4, 2022.
Claims priority of provisional application 63/133,425, filed on Jan. 4, 2021.
Prior Publication US 2024/0003437 A1, Jan. 4, 2024
Int. Cl. F16K 11/07 (2006.01); F15B 13/02 (2006.01); F16K 27/04 (2006.01); F16K 31/363 (2006.01)
CPC F16K 11/07 (2013.01) [F15B 13/02 (2013.01); F16K 27/041 (2013.01); F16K 31/363 (2013.01); F15B 2211/329 (2013.01); F16K 11/0716 (2013.01); Y10T 137/86879 (2015.04)] 6 Claims
OG exemplary drawing
 
1. A pilot operated hydraulic directional control valve for hydraulic systems, the hydraulic directional control valve comprising:
a valve body with a hollow chamber, the valve body comprising:
a first top port provided at a top surface of the valve body, the first top port in fluid communication with an outer space of the valve body;
a first top semicircular cavity located between the first top port and the hollow chamber, the first top semicircular cavity configured to provide fluid communication between the first top port and the hollow chamber;
a first bottom port provided at a bottom surface of the valve body, the first bottom port associated with the first top port, the first bottom port in fluid communication with the outer space of the valve body;
a first bottom semicircular cavity located between the first bottom port and the hollow chamber, the first bottom semicircular cavity configured to provide fluid communication between the first bottom port and the hollow chamber;
a second top port provided at the top surface of the valve body, the second top port in fluid communication with the outer space of the valve body;
a second top semicircular cavity located between the second top port and the hollow chamber, the second top semicircular cavity configured to provide fluid communication between the second top port and the hollow chamber;
a second bottom port provided at the bottom surface of the valve body, the second bottom port associated with the second top port, the second bottom port in fluid communication with the outer space of the valve body;
a second bottom semicircular cavity located between the second bottom port and the hollow chamber, the second bottom semicircular cavity configured to provide fluid communication between the second bottom port and the hollow chamber;
a third top port provided at the top surface of the valve body, the third top port in fluid communication with an outer space of the valve body;
a third bottom port provided at the bottom surface of the valve body, the third bottom port associated with the third top port, the third bottom port in fluid communication with the outer space of the valve body;
a first connecting hole provided between the third top port and the third bottom port, the first connecting hole configured to provide fluid communication between the third top port and the third bottom port;
a fourth top port provided at the top surface of the valve body, the fourth top port in fluid communication with the outer space of the valve body;
a fourth bottom port provided at the bottom surface of the valve body, the fourth bottom port associated with the fourth top port, the fourth bottom port in fluid communication with the outer space of the valve body; and
a second connecting hole provided between the fourth top port and the fourth bottom port, the second connecting hole configured to provide fluid communication between the fourth top port and the fourth bottom port; and
a spool disposed slidably inside the hollow chamber, an outer diameter of the spool corresponding to an inner diameter of the hollow chamber, the spool comprising:
a first sealing part at a first end of the spool, an outer diameter of the first sealing part corresponding to the inner diameter of the hollow chamber;
a second sealing part at a second end of the spool, an outer diameter of the second sealing part corresponding to the inner diameter of the hollow chamber;
a middle sealing part at a middle of the spool, an outer diameter of the middle sealing part corresponding to the inner diameter of the hollow chamber;
a first circular gap between the first sealing part and the middle sealing part; and
a second circular gap between the second sealing part and the middle sealing part;
wherein:
responsive to the spool being placed at a first end of the hollow chamber:
the first circular gap is aligned with the first top semicircular cavity and the first bottom semicircular cavity and, thereby, the first circular gap, the first top semicircular cavity, and the first bottom semicircular cavity provide fluid communication between the first top port and the first bottom port; and
the second circular gap is aligned with the second top semicircular cavity and the second bottom semicircular cavity and, thereby, the second circular gap, the second top semicircular cavity, and the second bottom semicircular cavity provide fluid communication between the first top port and the first bottom port; and
responsive to the spool being placed at a second end of the hollow chamber:
the first circular gap is misaligned with the with the first top semicircular cavity;
the first sealing part blocks the first top semicircular cavity and the first top port;
the second circular gap is misaligned with the second top semicircular cavity;
the second sealing part blocks the second top semicircular cavity and the second top port; and
the second bottom port is connected to the second connecting hole.