Duplomatic Solenoid Valve DSPE 7 DSP7 DS3 DS5 | Pilot Operated & Proportional Valves

The DS3, DS5, DSP7, and DSPE 7 solenoid directional and proportional valves by Chengyuan Hydraulic are high-performance control components fully compatible with Duplomatic industrial standards. This range spans from compact CETOP 3 direct-acting valves to high-flow CETOP 7 pilot-operated units. Models like the DSPE 7-C150 utilize advanced proportional technology for linear flow and pressure regulation, while the DSP7-S12 handles massive flow rates via a dual-stage pilot structure. As Chengyuan’s flagship valve assembly, every unit undergoes 100% dynamic response and high-pressure internal leakage testing, ensuring 100% original-place interchangeability for critical automated production lines.

Technical Specifications:

• Core Series: DS3 (CETOP 03), DS5 (CETOP 05), DSP7 (CETOP 07)

• Example Model Codes: DSPE 7-C150/20N-II/D24K1, DSP7-S12/20N-IE, DSP7-S6/20N-II

• Operating Pressure: Rated $35\text{ MPa (350 bar / 5000 psi)}$; T-port backpressure up to $21\text{ MPa}$

• Max Flow Rate: DS3 ($100\text{ L/min}$), DS5 ($150\text{ L/min}$), DSP7 ($300\text{ L/min}$)

• Control Voltages: 24V DC, 110V AC, 230V AC

• Electrical Connection: DIN 43650 plug, IP65 protection

• Spool Functions: S1, S2, S3, S4, S6, S12, C150 (Proportional) and more available

• Pilot Configurations: II (Internal Pilot/Internal Drain), IE (External Pilot/Internal Drain), etc.

Key Technical Advantages:

• High-Precision Spool-Body Matching: The spool and valve body are precision-lapped to nanometer tolerances, drastically reducing internal leakage. Even at a high pressure of $31.5\text{ MPa}$, leakage remains far below industry standards, maintaining system stability.

• Optimized Flow Paths & Low Pressure Drop: Internal geometries are optimized via CFD (Computational Fluid Dynamics) to minimize turbulence and resistance. This reduces power loss and controls the rate of oil temperature rise during high-frequency operation.

• Low Hysteresis & Precise Deadband: For the DSPE 7 proportional series, we use high-performance solenoids and low-friction spool supports. This ensures high linearity between command signals and flow output, ideal for precision molding and synchronized control.

• Heavy-Duty Wet Solenoid Technology: The armature operates fully immersed in oil, providing excellent heat dissipation and cushioning. This allows the valve to maintain electrical and mechanical integrity even during high-frequency switching cycles (e.g., $10000$ cycles/hour).

Application Areas:

• Metallurgy & Steel Industry: Continuous casting systems, hydraulic shears, and high-pressure pump stations.

• Plastic & Rubber Machinery: Injection control and large clamping systems.

• Heavy Machine Tools & Pressing: CNC press brakes, heavy hydraulic presses, and automated assembly line logic.

Expert Maintenance Tips:

• Pilot Pressure Management: For DSP7 valves using External Pilot (IE), ensure the pilot pressure is stable and at least $1\text{–}2\text{ MPa}$ lower than the main circuit pressure to prevent excessive spool impact.

• Fluid Cleanliness Standards: Proportional valves (DSPE series) are highly sensitive to contamination. Systems must utilize $10\mu\text{m}$ (or finer) filters, maintaining cleanliness to ISO 4406 18/16/13.

• Backpressure Control on T-Port: When using Internal Drain (II), ensure the return line (T port) is free from major backpressure spikes. Excessive backpressure can impair proportional regulation accuracy or lead to pilot malfunction.