Three-Position Four-Way Rotary Valve

I. Product Introduction

The four-way hydraulic valve is a fluid directional control valve with four built-in oil ports, and is also an essential core reversing component for refrigeration and heat exchange equipment. Relying on electromagnetic pilot control and pressure differential piston linkage structure, it switches pipeline media flow direction to switch equipment between refrigeration and heating circulation modes. It is suitable for central air conditioning and industrial chiller unit heat exchange reversing operations, with sensitive valve linkage and stable reversing performance.

II. Power-Off Refrigeration Working Principle

Under power-off conditions of the solenoid valve coil, the pilot slide valve is pushed leftward by the right-side compression spring force. High-pressure media is introduced into the right piston chamber through the capillary tube; simultaneously, media in the left piston chamber is discharged outward, creating a pressure differential across the piston, pushing the piston and main slide valve assembly to move left. At this time, the equipment discharge pipe connects to the outdoor unit pipeline, and the other two pipelines are interconnected, allowing the unit to stably operate in the refrigeration cycle.

III. Power-On Heating Working Principle

Under power-on conditions of the solenoid valve coil, the electromagnetic coil generates magnetic force, overcoming the compression spring force to drive the pilot slide valve rightward. High-pressure media is introduced into the left piston chamber through the capillary tube; simultaneously, media in the right piston chamber is discharged outward, creating a reverse pressure differential across the piston, pushing the piston and main slide valve assembly to move right. At this time, the equipment discharge pipe connects to the indoor unit connection pipe, and the other two pipelines are interconnected, allowing the unit to switch to the heating cycle.

IV. Structure Components

1. Valve Body Main Body: Built-in four interconnected oil ports, controlling pipeline media flow direction switching.

2. Electromagnetic Pilot Assembly: Composed of electromagnetic coil and pilot slide valve, providing reversing drive force.

3. Elastic Reset Assembly: Equipped with compression spring, achieving power-off automatic reset reversing.

4. Pressure Differential Actuator: Piston and main slide valve linkage, completing main valve reversing through chamber internal/external pressure differential.

5. Guide Capillary Tube: Flow limiting and guiding, balancing high/low pressure media flow direction, ensuring stable piston pressure differential.

V. Product Features

1. Four oil port integrated structure, single valve completes cold/hot bidirectional circulation reversing, high component integration.

2. Electromagnetic + pressure differential linkage reversing, low opening/closing energy consumption, smooth reversing action, low valve body impact noise.

3. Spring automatic reset, power-off automatic switching to refrigeration mode, high operating condition fault tolerance, strong use safety.

4. Adaptable to refrigerant media, good sealing adaptability, refrigerant corrosion resistant, long-term reciprocating reversing without internal leakage.

5. Fast reversing response, short cold/hot mode switching time, suitable for unit frequent start/stop switching operations.

VI. Application Fields

Mainly suitable for commercial central air conditioning, industrial chiller units, constant temperature heat exchange equipment, and integrated cooling/heating refrigeration equipment. Exclusively switches refrigerant flow direction to achieve one-key switching between unit refrigeration and heating modes, widely used with HVAC cooling/heating complete equipment.

VII. Usage Precautions

1. Adaptable to dedicated refrigerant media; do not mix impurities and oil contamination to avoid blocking capillary tubes and pilot valve ports.

2. Verify coil rated voltage, match unit electronic control parameters, and prevent voltage abnormalities from causing reversing failure.

3. Maintain horizontal valve body installation to ensure smooth piston and slide valve sliding, avoiding jamming reversing faults.

4. Regularly test spring elasticity; replace promptly when elasticity decays to ensure reliable power-off reset reversing.

5. Provide cooling protection during pipeline welding installation to avoid high-temperature damage to internal valve body sealing components.