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  • Explosion-Proof Proportional Relief Valve
  • Explosion-Proof Proportional Relief Valve
  • PRODUCT DETAILS
  • FAQ
Specific Applications

·Pressure control systems in petrochemical plants
·Hydraulic power units for offshore platforms
·Mining hydraulic equipment
·Explosion-proof hydraulic test benches
·Process control systems in chemical plants
·Industrial machinery requiring variable pressure regulation

Core Functions

Continuous Pressure Adjustment
The valve adjusts hydraulic pressure proportionally to the input electrical signal, allowing smooth and stepless pressure regulation instead of fixed pressure settings.

Stable Pressure Regulation
The proportional control design helps maintain consistent system pressure during load changes, improving hydraulic system stability and reducing pressure fluctuations.

Explosion-Proof Electrical Operation
Designed for hazardous industrial environments, the valve combines proportional pressure control with explosion-proof electrical protection for reliable operation.

Industrial Electrical Performance
The valve operates with a DC 24 V power supply, a rated current of 750 mA, and an IP55 protection rating, making it suitable for demanding industrial hydraulic applications.

Compatible with Common Hydraulic Fluids
The valve is designed for mineral hydraulic oil and phosphate ester hydraulic fluid, supporting a wide range of industrial hydraulic systems.

Technical Specifications
Specifications 02 
Maximum Operating Pressure(MPa) Oilports P 31.5 
Oilports T
Working pressure(Mpa) 7, 16, 25, 31.5
Max.Flow(L/min)
Working Fluid Mineral oil phosphate-ester
Fluid temp. (℃) -20~70
Viscosity(mm²/s) 15~380
Hysteresis (%) <2
Repeatability (%) <2
Linearity(%) <3.5
Working Voltage(V) DC24
Rated Current(mA) 750 
Coil Resistance (Ω) 19.5 
Insulating grade IP 55

taJu53

Fixing screw
Specification Amount Tightening Torque
M5×45-12.9 9Nm

OEM / ODM Customization

We provide OEM and ODM services for hydraulic equipment manufacturers and industrial system integrators, including:

·Pressure adjustment range customization
·Coil voltage and electrical connector options
·Hydraulic interface and mounting configuration
·Product labeling and customized packaging
·Technical support based on hydraulic system requirements

Purchasing Information

Item

Details

MOQ

Standard cartridge valves: 100 pcs/model; Custom manifold blocks: 30 pcs minimum. Small trial orders are accepted.

Lead Time

Stock valves: 2 weeks; Regular orders: 6–8 weeks; Custom products: about 8 weeks after drawing approval and deposit.

Payment Terms

30% T/T deposit, 70% balance before shipment. Sample orders require full payment. L/C is negotiable for long-term customers.

Trade Terms

FOB Ningbo by default. CIF quotations are available upon request.

Sample Policy

Stock samples are available. OEM/ODM samples can be produced based on drawings or samples.

OEM / ODM

Logo engraving, customized packaging, and product customization are supported.

Quality Assurance

Every valve is pressure-tested before shipment and covered by a 12-month warranty.

FAQ

1. What is an Explosion-Proof Proportional Relief Valve used for?
An Explosion-Proof Proportional Relief Valve is used to continuously regulate hydraulic system pressure through proportional electrical control while meeting explosion-proof requirements in hazardous environments.

2. How does a proportional relief valve differ from a conventional relief valve?
A conventional relief valve is typically adjusted manually to a fixed pressure, while a proportional relief valve changes the pressure continuously according to the input electrical signal, making it suitable for variable operating conditions.

3. What are the standard electrical specifications?
The standard configuration operates at DC 24 V with a rated current of 750 mA and features an IP55 protection rating.

4. Which hydraulic fluids are supported?
The valve is compatible with mineral hydraulic oil and phosphate ester hydraulic fluid commonly used in industrial hydraulic systems.

5. Can the Explosion-Proof Proportional Relief Valve be integrated into automated hydraulic systems?
Yes. The Explosion-Proof Proportional Relief Valve is designed for electrically controlled hydraulic systems and can be integrated with compatible controllers and amplifiers for precise pressure management.

Ningbo Stars Hydraulic Co., Ltd.

Founded in 2001, Ningbo Stars Hydraulic Co., Ltd. is a hydraulic valve manufacturer that upholds integrity and wins market recognition through superior quality and pragmatic craftsmanship. We introduced hydraulic valve technologies from Germany’s Rexroth and Japan’s Yuken series, and through years of dedicated research, digestion, absorption, modification and optimization, our products stand out in the market. Our valves sell well nationwide and are exported to overseas markets, earning praise and trust from numerous customers at home and abroad. Though compact in size, hydraulic valves deliver critical functions as indispensable core components enabling multi-functional and automatic operation of mechanical equipment. The quality of a hydraulic valve largely determines the overall operating performance of the entire machinery. Supported by national industrial policies, China’s machinery industry is striving to catch up with European and American counterparts to meet booming demands from agriculture, industry, construction, transportation, and land, sea and air defense sectors—this momentum has greatly boosted the domestic hydraulic industry. To embrace the new wave of machinery upgrading, our company has launched a new round of optimization and improvement for our valve products. Building on our existing valve manufacturing technologies and processes, and under the guidance of domestic and international industry experts as well as Taiwanese technical engineers, we have comprehensively upgraded product structures, internal workshop purification and precision of core components. We have implemented effective control over internal stress, thermal deformation, leakage and noise of valves. Every batch of raw materials, auxiliary parts, semi-finished and finished products undergoes rigorous item-by-item inspection. We have also strengthened full-process quality supervision, with zero tolerance for defective products leaving the factory, guaranteeing reliable and long-lasting product performance. Our after-sales service includes timely technical guidance and warranty support, plus follow-up tracking of product operating conditions throughout their service life. Product competition is essentially a contest of technology, workforce dedication, team competence and corporate management. More importantly, it hinges on the founder’s philosophy, integrity and service mindset. There is no end to pursuing premium quality. Committed to specialization, refinement, quality excellence and technological innovation, our company adheres to the manufacturing principle of “Better fewer than shoddy goods” and the service tenet of “Put ourselves in customers’ shoes”. Standing at a new developmental milestone, all staff at Stars sincerely seek cooperation with clients worldwide. We aim to build mutual trust and shared prosperity, and jointly create a brighter future for the hydraulic industry.

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