Bürkert Type 643/653 Solenoid Valve | 00618556 00125832 | 2/2 & 3/2-Way Direct-Acting Valve

The Type 643/653 Series (often referred to as 0643/0653) from Chengyuan Hydraulic consists of high-performance, direct-acting 3/2-way solenoid valves fully compatible with Bürkert industrial standards. These valves are characterized by their ability to switch reliably without any differential pressure, making them ideal for vacuum systems and precision low-pressure fluid control. For core models like 00618556 and 00125832, we have enhanced the thermal dissipation of the solenoid coils and the surface hardness of the plungers. Every valve undergoes 100% action testing under simulated conditions to ensure zero internal leakage and reliable operation, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: Type 643 / Type 653 (Direct-acting)

• Function: 3/2-way (Two-position Three-way)

• Reference Part Numbers: 00618556, 00125832, 00125829

• Nominal Diameter: DN 6mm to DN 12mm

• Pressure Range: 0 to 16 bar (depending on orifice size)

• Body Material: Premium Brass / Stainless Steel 316L

• Sealing Material: NBR / FKM (Viton)

• Voltage Options: 24V DC, 230V AC (50-60Hz)

• Explosion Protection: Optional Ex m II T4 rating

Key Technical Advantages:

• Zero-Pressure Switching: Utilizing a robust direct-acting plunger design, actuation depends solely on electromagnetic force. The valve operates instantaneously even at 0 bar differential pressure or under vacuum, avoiding the limitations of servo-assisted valves.

• Vibration-Resistant Long-Life Plunger: The plunger is crafted from high-permeability stainless steel with specialized heat treatment. It offers exceptional wear resistance and mechanical durability, sustaining millions of cycles in high-frequency applications.

• Precision Seal-to-Seat Compensation: The valve seat features a precision compensation structure. Even with trace contaminants in the medium, the elastic deformation of the high-quality seal ensures tight shut-off, significantly reducing leakage risks.

• Versatile Flow Configuration: Type 643 supports various flow directions (distribution or mixing). This flexibility makes it easy to integrate into complex automated circuits as a pilot valve or a direct controller for small actuators.

Application Areas:

• Pneumatic Actuator Control: Controlling the opening/closing of pneumatic ball or butterfly valves.

• Chemical Process Automation: Handling aggressive gases or neutral fluids in hazardous (explosion-proof) environments.

• Sterilization & Cleaning Equipment: Fluid diversion and vacuum isolation in medical and laboratory devices.

Expert Maintenance Tips:

• Port 3 Protection: It is recommended to install a silencer or dust cap on Port 3 (exhaust) to prevent external debris from entering the valve body and damaging the internal seals.

• Coil Thermal Management: In continuous duty cycles, ensure adequate ventilation around the solenoid. If ambient temperatures exceed 55°C, consider upgrading to an H-class insulated coil.

• Mounting Orientation: While it can be mounted in any position, we recommend installing the coil vertically upward in systems with trace moisture to minimize the risk of sediment accumulation in the plunger tube.