Relief Valve

I. Product Introduction

Product Name: Direct-Acting Relief Valve

The DBD type valve is a direct-acting relief valve, serving as a key safety pressure regulation component for pressure pipelines, pressure vessels, and hydraulic energy storage systems. It combines system pressure stabilization, overload overflow, and overpressure protection functions, suitable for industrial high-pressure hydraulic system integration. The valve body features a protective cover adjustment screw pressure regulation structure with enhanced protection and stable pressure adjustment. It adopts a cartridge installation structure for convenient disassembly, excellent sealing, and precise system oil pressure control, ensuring long-term safe operation of hydraulic equipment and pressure vessels.

Relief valves are core safety components for pressure-bearing systems. To extend valve service life and ensure stable operation, regular inspections must be conducted to check for valve core jamming, spring corrosion, and valve body sticking. Inspect adjustment threads, adjustment ring set screws, and locknut fastening status; perform timely maintenance for any loose or faulty issues. Regularly disassemble the valve body for internal chamber cleaning, component inspection, and sealing surface grinding verification, and reuse after qualified repair and setting. Outdoor-installed valves require protection against rain, mist, dust, and corrosive impurity ingress into the valve body and discharge piping. When ambient temperature falls below 0°C, implement anti-freeze protection measures to ensure reliable valve opening/closing and pressure relief.

II. Basic Models and Pressure Specifications

Product Category: Industrial Direct-Acting Relief Valve

Pressure Regulation Range: 19MPa-23MPa

Pressure Rating: 31.5MPa

Factory Calibration Standard: Y25-20 type full-open pressure ≤23MPa±0.5MPa

III. Structure Description

1. Pressure Regulation Type: Equipped with protective adjustment screw and external protective cover, preventing external impact and accidental pressure adjustment, suitable for mining high-pressure harsh conditions.

2. Installation Connection: Cartridge connection, adaptable to standardized hydraulic valve ports, precise installation positioning, convenient disassembly and replacement, excellent sealing.

IV. Technical Parameters

Nominal Diameter: 20mm

Rated Flow: 100L/min

Rated Pressure: 31.5MPa

Closing Pressure: ≥19MPa

Factory Calibrated Full-Open Pressure: 23MPa±0.5MPa

V. Working Principle

Relying on built-in spring force for direct valve core control, this is a direct-acting pressure-bearing relief structure. When system oil pressure is below the closing pressure, the valve core closes and locks the oil circuit to maintain system pressure. When system oil pressure exceeds the opening pressure, the media directly pushes the valve core to displace and overflow for pressure relief, rapidly releasing excess pipeline pressure. After oil pressure falls back to the stabilization range, the spring directly resets to close the valve port, blocking overflow. The entire process features direct-acting response with fast pressure regulation feedback, suitable for industrial high-pressure hydraulic circuit pressure stabilization protection.

VI. Product Features

1. Precision manufacturing, high pressure-bearing accuracy, small pressure setting error, suitable for high-pressure precision hydraulic systems.

2. Direct-acting structure, no pilot transmission components, rapid overflow response, strong oil pressure shock resistance.

3. Protective cover adjustment screw, preventing accidental adjustment and impact, suitable for field and mining complex operating conditions.

4. Cartridge installation, compact valve body structure, small installation space, stable oil circuit sealing.

5. Strong pressure range adaptability, standard stabilization 19-23MPa, withstands 31.5MPa high pressure.

6. Easy maintenance, simple structure with low failure rate, convenient for disassembly, cleaning, grinding maintenance, and pressure readjustment.

VII. Application Fields

Mainly suitable for high-pressure hydraulic equipment, high-pressure hydraulic stations, bladder accumulator energy storage hydraulic systems, high-pressure vessels, and industrial high-pressure pipelines. Used for system pressure stabilization, overload overflow, and overpressure safety relief, controlling pipeline pressure-bearing limits.

VIII. Usage Precautions

1. Do not remove the pressure regulation protective cover to privately adjust the screw, avoiding pressure exceeding limits and damaging the hydraulic system and associated accumulators.

2. Regularly inspect valve body conditions, checking for valve core jamming, spring corrosion, thread looseness, and locknut displacement.

3. Periodically disassemble the valve body for chamber cleaning, grind and repair sealing surfaces, and verify calibrated pressure before reinstallation.

4. For outdoor exposed installations, add dustproof and waterproof protective components to prevent impurity ingress into the valve chamber and discharge piping.

5. In sub-zero low-temperature environments, implement valve body insulation and anti-freeze measures to prevent media freezing from causing valve core failure.

6. Operating pressure must not exceed the valve body 31.5MPa rated pressure, avoiding long-term overpressure operation leading to seal failure.

7. Ensure proper cartridge insertion during installation, fitting the valve port reference surface, to prevent installation offset causing high-pressure oil leakage and relief failure.