A Safety Three-way Proportional Throttle Valve Structure

Abstract

The invention relates to the technical field of valves, and discloses a safe three-way proportional throttle valve structure. The safe three-way proportional throttle valve structure comprises a mainvalve seat, a displacement sensor and a pilot valve, wherein a P oil port, an A oil port and a T oil port which communicate with a main valve cavity are formed in the side surface of the main valve seat in sequence from top to bottom, a P through hole is formed in the corresponding position of the side surface of a valve sleeve and the P oil port, an A through hole is formed in the corresponding position of the side surface of the valve sleeve and the A oil port, a T through hole is formed in the corresponding position of the side surface of the valve sleeve and the T oil port, a driving cylinder is arranged on the outer side surface of a main valve cover, a hollow main valve element is arranged in the valve sleeve, a first main piston and a second main piston are arranged on the main valve element in sequence from top to bottom, a braking piston is arranged in the driving cylinder, a sensor positioning sleeve is arranged on the upper end of the driving cylinder, the upper end of the main valve element passes through the driving cylinder and extends into the sensor positioning sleeve, and the displacement sensor is fixed to the interior of a sensor positioning seat and coaxially extends into the main valve element. The safe three-way proportional throttle valve structure has the beneficial effects of good stability, safety in use and convenience in maintenance.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a structure of a safety three-way proportional throttle valve. Background technique [0002] The three-way proportional throttle valve is widely used in die-casting machines, forging presses, ceramic presses and other equipment. The basic working principle of the proportional throttle valve is formed by the small-sized pilot proportional servo valve and the displacement sensor on the main valve Closed-loop control of the spool displacement of the large-bore proportional throttle valve, so as to realize the precise control of the opening degree of the proportional throttle valve, so as to realize the proportional adjustment of the flow rate between the P port, the A port, and the A port and the T port Features. At present, the displacement sensor in the common three-way proportional throttle valve directly communicates with the A port. The A port is the working port, which is usua...

AI Technical Summary

Problems solved by technology

At present, the displacement sensor in the common three-way proportional throttle valve directly communicates with the A port. The A port is the working port, which is usually connected to the pipeline or the actuator. There is a large pressure shock or negative pressure at the A port. , pressure shock or negative pressure can easily cause fatal damage to the displacement sensor, and usually the volume and weight of this proportional throttle valve are large, the replacement of the displacement sensor is difficult, the maintenance is long, and the cost is high; and the common three-way proportional throttle The main spool and the valve sleeve of the valve adopt one-sided guiding flow. When the oil is under the condition of large flow and high pressure drop, it will inevitably cause the main spool to generate a large radial force during the movement process. On the one hand It affects the movement speed and accuracy of the main spool. On the other hand, when the radial force reaches a certain level, the main spool will be stuck, so that the main spool cannot move, which will affect the effective control of the equipment.

Images