| 摘要 |
<p>A control system for controlling the pressure and pressure balance in two separate fluid pressure circuits. A valve being employed which comprises a balance piston and a regulating piston. Each of the pistons controls a connection of the first and second fluid pressure circuits to a respective relief line. Fluid pressure is applied to the regulating piston to regulate the pressure in one circuit and the balance piston regulates the pressure in the other circuits in relation to that regulated by the regulating piston. A three position switch and two air pressure regulators or a three position switch, two potentiometers and a servo control valve control the pressure applied to the regulating piston to control the pressures required in the first and second circuits for the desired modes of operation. A further balance valve may be disposed between the first and second circuits. The balance piston of the pressure and balance regulating valve may be provided with shock absorber means to resist the movement thereof in response to minor pressure fluctuations. Similarly, the balance piston of the additional balance valve may be provided with shock absorber means. The relief valve connection controlled by the balance valve of the pressure and balance regulating valve preferably has a triangular shaped opening.</p> |
