QDF Series Ball-Type Solenoid Directional Valve

I. Product Introduction

The solenoid valve is an electromagnetic-driven industrial automatic control equipment, a basic automatic control element for fluid media control, classified as an electrically controlled actuator, suitable for hydraulic and pneumatic fluid control systems. It can be integrated into industrial automatic control systems to regulate medium flow direction, velocity, pressure and other operating parameters, compatible with circuit-linked control, ensuring fluid control precision and operational flexibility, suitable for automated closed-loop control operations.

II. Basic Structure and Principle

The solenoid valve has a built-in sealed chamber structure with multiple connecting ports in the chamber, respectively connected to external oil and gas pipelines; a movable piston is assembled in the middle of the chamber, with electromagnetic coils symmetrically arranged on both sides. By switching the magnetic force direction through energizing and de-energizing the coils on both sides, the piston is magnetically attracted to shift position, switching and connecting different ports in the chamber, thereby opening and closing various medium ports and switching pipeline medium flow paths.

III. Linked Transmission Process

The valve body ports normally maintain a conductive state. After electromagnetic directional switching is completed, the working medium is diverted into corresponding discharge pipelines, and the medium oil or gas pressure drives the cylinder piston to reciprocate; the piston is linked with the piston rod to operate, thereby driving the downstream mechanical equipment to run. The whole machine relies on electromagnetic coil energizing/de-energizing and current on/off control to precisely control the start-stop and reciprocating motion of downstream machinery, realizing linked operation of electrical control of fluid and fluid control of machinery.

IV. Categories and Functions

Solenoid valves have complete categories, suitable for different installation positions in automatic control systems, each performing its control function. Common industry categories include: solenoid check valves, solenoid safety valves, solenoid directional control valves, and solenoid speed regulating valves, suitable for pipeline backflow prevention, overpressure relief, flow direction switching, and flow velocity control across all dimensions of automatic control operations.

V. Core Product Features

1. High degree of electrical automation control, fast electromagnetic on/off response, suitable for industrial control system automated linked regulation;

2. Diverse circuit compatibility, can match various electrical control circuits, suitable for customized automatic control logic, high control flexibility;

3. Integrated sealed chamber structure, stable sealing, precise medium diversion and directional switching, extremely low medium leakage;

4. Wide medium adaptability, not limited to hydraulic oil and compressed air, suitable for various gas-liquid fluid medium automatic control;

5. Strong linked closed-loop performance, smooth electromagnetic, fluid, and mechanical linkage, can remotely electrically control equipment actions;

6. Rich category selection, can choose directional, speed regulating, pressure relief, and pressure maintaining models as needed, suitable for all industrial control pipelines.

VI. Core Applications

Widely used with hydraulic and pneumatic automatic control systems, industrial automation production lines, machine tool electrical control oil circuits, construction machinery fluid control, and energy storage electrical control oil circuits, for medium flow direction switching, flow velocity pressure regulation, pipeline safety relief, and medium one-way protection, realizing automated unattended fluid control.

VII. Usage Precautions

1. Connect voltage and current matching the valve body rated electrical control parameters to avoid voltage overload burning the electromagnetic coil;

2. Pre-filter and purify the medium to prevent impurities from entering the chamber and jamming the piston, causing directional switching jamming and port blockage;

3. Verify pipeline connection port positions, correspondingly connect oil and gas ports, to avoid connection misalignment affecting mechanical linkage actions;

4. For humid conditions, provide coil waterproof protection to prevent circuit moisture short circuits, ensuring stable electromagnetic attraction action;

5. Select valve type according to working conditions: directional control valve for switching, safety valve for pressure stabilization, do not mix valve types;

6. Regularly clean chamber oil contamination and impurities, check coil aging degree, ensuring sensitive piston directional switching and magnetic attraction action;

7. For long-term shutdown operations, cut off the valve body power supply to avoid coil long-term energizing heat accumulation and component life loss.