Category Archives for Pressure Control Valves
Yuken Pressure Reducing Valves/Pressure Reducing and Check Valves
These valves set hydraulic circuit pressure equal to or below a pressure in the main circuit. When the outlet pressure reaches a preset level, the valve opens, and the balanced piston moves to throttle a passage to keep the outlet … Continue reading
Yuken Unloading Relief Valves
These valves are used to operate pumps at the minimum load in an accumulator circuit or in a high-low pump circuit. In an accumulator circuit, when the system pressure reaches a preset level (i.e. cut-out pressure), the valve opens to … Continue reading
Yuken Counterbalance Valves
These valves maintain hydraulic pressure in a hydraulic system or load backpressure on a cylinder. If the inlet pressure exceeds a preset level, flow is released to keep the pressure constant. They are accompanied with a check valve that allows … Continue reading
Yuken Sequence Valves
These valves control the sequential operation of two or more actuators. If the inlet pressure exceeds a preset level, they deliver effective pressure to the outlet side. The valves can serve as pressure holding valves to maintain hydraulic pressure in … Continue reading
Yuken Solenoid Controlled Relief Valves
These valves are a combination of a pilot operated relief valve and a small solenoid operated directional valve. Sending electrical signals to the directional valve can remotely unload pump pressure or conduct the two- or three-pressure control in hydraulic circuits. … Continue reading
Yuken Pilot Operated Relief Valves
These valves consist of a balanced piston for bypassing excess flow in hydraulic circuits and a pilot that controls the piston motion and pressure. Placed in a vent circuit, they can perform remote control, unloading, or two- pressure control. Specifications … Continue reading
Yuken Direct Type Relief Valves
These valves are small and have a simple structure for their capacity. However, they are likely to exhibit high- pressure override (a pressure characteristic observed when a fluid starts flowing from a valve and reaches the rated flow rate) and … Continue reading
Jet Control Valves
The principle of converting pressure into kinetic energy and then reconverting this energy into a controlled pressure can be utilized as a control means. The various types of jet control valves use this mode of operation. Proportional control is obtained … Continue reading
Hydraulic Pilot Operated Relief Valve
The direct acting and pilot operated relief valve have a different pressure vs. flow curve although both of them perform the same function. The pilot operated relief valve allows the operation over a wider pressure range. The figure above shows … Continue reading
Hydraulic Direct Acting Relief Valve Working Principle
The figure above illustrated the working principle of direct acting relief valve. When the hydraulic force Fh equals spring force Fs, the valve cracks open, meaning that the spool lifts off its seat and allows fluid to flow to the … Continue reading