HAWE PMVP Series Proportional Relief Valve | PMVP 5-44-G24 PMVP 5-43-G24 | Pressure Control Valve

The PMVP Series Proportional Relief Valves by Chengyuan Hydraulic are pilot-operated pressure control units designed for high-pressure hydraulic applications. These valves offer 100% original-place interchangeability with HAWE standards. The PMVP series provides stepless adjustment of system pressure proportional to the input electrical current, making it ideal for load-sensing and dynamic pressure regulation. Built with high-strength steel housings, these valves maintain zero leakage and superior linear control even at pressures up to $700\text{ bar}$. Each unit is subjected to 100% simulated condition testing, ensuring response times and hysteresis levels that outperform industry standards.

Technical Specifications:

• Representative Models: PMVP 5-44-G24, PMVP 5-43-G24, PMVP 5-41-G24

• Size Standard: Size 5 (NG 6 subplate mounting)

• Maximum Operating Pressure: $700\text{ bar (70 MPa / 10,150 psi)}$

• Adjustable Pressure Ranges:

  • PMVP 5-44: Up to $700\text{ bar}$

  • PMVP 5-43: Up to $450\text{ bar}$

  • PMVP 5-41: Up to $200\text{ bar}$

• Control Voltage: G24 ($24\text{V DC}$)

• Rated Current: Approx. $0\text{–}0.8\text{ A}$

• Max Flow Rate: Approx. $12\text{–}15\text{ L/min}$ (as a pilot valve)

• Fluid Temperature: $-40\text{°C}$ to $+80\text{°C}$

Key Technical Advantages:

• High-Precision Proportional Solenoid: Features a wet-pin proportional solenoid where thrust varies linearly with current. Combined with a precision-lapped needle valve, it achieves low hysteresis ($\le 3\%$) and high repeatability for stable pressure control.

• Extreme High-Pressure Ceiling: Inheriting the all-steel construction, the valve body and internal parts undergo rigorous heat treatment. The PMVP 5-44 handles $700\text{ bar}$ extreme pressures with ease, making it the preferred choice for ultra-high-pressure hydraulic stations.

• Anti-Vibration & Sealing Performance: Optimized internal damping structures suppress high-frequency oscillations and noise in the pilot circuit. High-grade NBR or Viton seals with a hard-seated base ensure reliable cut-off capability at zero current.

• Compact Manifold Mounting: Standardized mounting patterns allow for easy integration into complex valve blocks. This design saves space and minimizes potential leakage points associated with pipe fittings.

Application Areas:

• Hydraulic Test Benches: Used for simulating various load pressure curves.

• Machine Tools & Stamping: Enables stepless proportional adjustment of stamping forces.

• Lifting Equipment: Acts as a pilot control for main relief valves to achieve soft starts and smooth braking in winching or luffing systems.

Expert Maintenance Tips:

• Dither Signal: It is recommended to use a dither frequency of $100\text{–}150\text{ Hz}$ in the controller. This overcomes static friction in the solenoid core, ensuring more sensitive and continuous pressure regulation.

• Filtration Standard: The pilot orifices inside the PMVP are extremely small (often $<1\text{mm}$). System filtration must be at least $10\mu\text{m}$ to prevent spool sticking or failure to regulate pressure.

• Connector Protection: Ensure the G24 plug is properly sealed. In high-humidity environments, moisture ingress can cause proportional signal drift.