| 摘要 |
<p>A modulation control valve includes a modulating valve coupled by springs to an accumulator piston with both fluidly connected to a reservoir valve. The modulating valve is moved by pressurized fluid in an inlet port connected thereto when a predetermined fill pressure is reached. The fluid in the outlet port pressurizes the accumulator piston to move it to urge the modulating valve to pressure modulate fluid flow between the inlet and an outlet ports. Pressurized fluid in the outlet port acts on a return spring end of the reservoir valve to prevent the accumulator piston and on the other end of the reservoir valve from being relieved to a fluid reservoir. When the accumulator piston abuts the modulating valve, the inlet and outlet ports will be placed in full fluid communication to end modulation. Sudden demands acting on the modulation control valve reduce the pressure in the outlet port causing the accumulator piston pressure to move the reservoir valve to block the spring end of the reservoir valve from the outlet port and allow the accumulator piston pressure to be relieved past the reservoir valve. When the accumulator piston is relieved, the return spring urges the reservoir valve back to its initial position.</p> |
