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3 week ago

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3 year

Product details

1. Definition & Function

ASolenoid-Operated Relief Valveis a pressure-relief valve controlled by an electromagnetic solenoid, used in hydraulic systems to limit maximum pressure and prevent overload damage. Its core functions include:

• Overpressure protection: Opens to relieve pressure when system pressure exceeds the set value.

• Remote control: Rapid response to pressure changes via electrical signals.

• Pressure adjustment: Integrated pressure regulation (available in some models).

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2. Working Principles

Direct-Acting Type

1. Solenoid energized: Generates magnetic force to push the spool, overcoming spring force to open the valve.

2. Pressure relief path: High-pressure oil flows from the inlet (P port) to the tank (T port), reducing system pressure.

3. De-energized reset: Spring force closes the spool, restoring system pressure.

Characteristics:

• Fast response (<50ms), but limited flow capacity (typically ≤60 L/min).

• Suitable for low-pressure, small-flow systems (e.g., machine tool fixtures).

Pilot-Operated Type

1. Solenoid controls pilot pressure: When energized, the pilot valve opens, reducing pressure in the main valve’s spring chamber.

2. Main valve opens: Pressure differential across the main spool pushes it open for high-flow relief.

3. De-energized reset: Pilot valve closes, restoring spring chamber pressure and closing the main valve.

Characteristics:

• High flow capacity (up to 3,000 L/min), but slower response (100–300ms).

• Suitable for high-pressure, large-flow systems (e.g., injection molding machines, presses).

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3. Key Technical Specifications

【表格】

Parameter Description

Rated Pressure (MPa) Maximum operating pressure (e.g., 21 MPa, 35 MPa).

Adjustment Range (MPa) Pressure-adjustable interval (e.g., 0.5–21 MPa).

Flow Rate (L/min) Maximum throughflow (direct-acting: <60 L/min; pilot-operated: up to 3,000 L/min).

Response Time (ms) Time from energization to full valve opening (direct-acting: <50ms; pilot-operated: 100–300ms).

Voltage (V) Solenoid operating voltage (common: 12VDC, 24VDC, 110VAC, 220VAC).

Seal Material Oil-resistant rubber (NBR), fluororubber (FKM), or PTFE.

Mounting Type Subplate mount, pipe mount, or thread mount.

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4. Typical Applications

1. Industrial Equipment:

• Injection molding machines: Controls clamping cylinder pressure to prevent mold damage.

• Presses: Limits hydraulic cylinder pressure to protect workpieces and equipment.

2. Construction Machinery:

• Excavators: Controls swing motor and boom cylinder pressure.

• Cranes: Prevents overload-induced structural failure.

3. Automated Production Lines:

• Hydraulic presses: Precisely controls stamping pressure for product consistency.

• Robots: Protects servo valves and actuators from overpressure.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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3 year

Main Product: hydraulic motor, gear box, hydraulic pump , hydraulic valve , hydraulic winch, hydraulic system

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