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SL/SV Hydraulic Controlled Check Valve
SL/SV hydraulic controlled check valve is a key fluid control element in hydraulic systems and is widely used in situations where precise control of the oil flow direction is required. The following is an introduction from the aspects of structure, working principle, technical parameters, application fields and usage precautions:
1. Structural characteristics
Valve body material: high-strength cast iron or steel parts ensure pressure resistance and durability.
Valve spool design: conical valve spool structure, tightly matched with the valve seat, excellent sealing performance.
Control method: Opening and closing the valve core through an external control oil circuit (pilot oil circuit).
Oil drainage method: SV type: Internal oil drainage, suitable for occasions without leakage requirements.
SL type: External oil drain, suitable for systems that require external oil drain ports.
2. Working principle
Forward flow: When oil flows from port A to port B, the valve core opens under the action of oil pressure and the oil passes freely.
Reverse cutoff: When oil is trying to flow from port B to port A, the valve core is closed under the action of spring force and oil pressure to prevent reverse flow.
Hydraulic control opening: When pressure oil is passed into the control oil port X, the control piston pushes the valve core, so that the oil circuit from port B to port A is conductive, and the reverse flow is achieved.
3. Technical parameters
Parameter specification description
Diameter range of 10mm to 30mm (such as SV10, SV20, SV30 and other models)
Nominal pressure can reach 31.5 MPa
Flow range can range from 400 L/min to 550 L/min (varies under different models and operating conditions)
The opening pressure can be selected from 0.35 MPa, 1.5 MPa, 3.5 MPa, etc., and customized according to application requirements.
Temperature range -30℃ to +80℃
Connection method threaded connection (metric/indian), plate connection
IV. Application areas
Hydraulic system: Pressure holding circuit: When the hydraulic cylinder is kept, prevent oil leakage and ensure stable system pressure.
Locking circuit: cooperate with hydraulic lock to achieve reliable positioning of the hydraulic cylinder.
Dual speed loop: Fast forward and manual forward switching is achieved through a hydraulically controlled check valve.
Construction machinery: In excavators, cranes and other equipment, it is used to control the operating sequence and speed of hydraulic cylinders.
Aerospace: In the aircraft hydraulic system, ensure the stable operation of key components.
Industrial equipment: In injection molding machines, die-casting machines and other equipment, precise control of oil is achieved.
5. Precautions for use
Installation direction: Make sure the valve body arrow pointing in line with the oil flow direction to avoid system failure caused by reverse installation.
Control oil circuit: The control oil port X needs to be connected to a stable pressure oil source to ensure that the valve core is opened reliably.
Oil drain treatment: The SL type check valve needs to be connected to an external oil drain port to ensure that the oil drain is unobstructed and avoid back pressure affecting the valve core movement.
Pressure matching: The working pressure should be lower than the rated value to avoid damage to the valve body due to overpressure use.
Maintenance: Check the wear of the valve core and valve seat regularly, replace the seals in time to ensure sealing performance.
6. Model and selection suggestions
SV type: suitable for internal oil drainage occasions, compact structure and easy to install.
SL type: suitable for systems that require external oil drain ports, which are easy to maintain and debug.
Selection basis: Select the appropriate diameter and model according to system pressure, flow rate and installation space.
Select the appropriate opening pressure and oil drainage method according to the control requirements.
7. Advantages
High reliability: Use high-quality materials and precision processing to ensure long-term and stable operation.
Flexible control: Reverse flow is achieved through hydraulic control to meet the needs of complex working conditions.
Widely applicable: suitable for a variety of hydraulic systems and industrial equipment, with a wide range of applications.
SL/SV hydraulic controlled check valve is a key fluid control element in hydraulic systems and is widely used in situations where precise control of the oil flow direction is required. The following is an introduction from the aspects of structure, working principle, technical parameters, application fields and usage precautions:
1. Structural characteristics
Valve body material: high-strength cast iron or steel parts ensure pressure resistance and durability.
Valve spool design: conical valve spool structure, tightly matched with the valve seat, excellent sealing performance.
Control method: Opening and closing the valve core through an external control oil circuit (pilot oil circuit).
Oil drainage method: SV type: Internal oil drainage, suitable for occasions without leakage requirements.
SL type: External oil drain, suitable for systems that require external oil drain ports.
2. Working principle
Forward flow: When oil flows from port A to port B, the valve core opens under the action of oil pressure and the oil passes freely.
Reverse cutoff: When oil is trying to flow from port B to port A, the valve core is closed under the action of spring force and oil pressure to prevent reverse flow.
Hydraulic control opening: When pressure oil is passed into the control oil port X, the control piston pushes the valve core, so that the oil circuit from port B to port A is conductive, and the reverse flow is achieved.
3. Technical parameters
Parameter specification description
Diameter range of 10mm to 30mm (such as SV10, SV20, SV30 and other models)
Nominal pressure can reach 31.5 MPa
Flow range can range from 400 L/min to 550 L/min (varies under different models and operating conditions)
The opening pressure can be selected from 0.35 MPa, 1.5 MPa, 3.5 MPa, etc., and customized according to application requirements.
Temperature range -30℃ to +80℃
Connection method threaded connection (metric/indian), plate connection
IV. Application areas
Hydraulic system: Pressure holding circuit: When the hydraulic cylinder is kept, prevent oil leakage and ensure stable system pressure.
Locking circuit: cooperate with hydraulic lock to achieve reliable positioning of the hydraulic cylinder.
Dual speed loop: Fast forward and manual forward switching is achieved through a hydraulically controlled check valve.
Construction machinery: In excavators, cranes and other equipment, it is used to control the operating sequence and speed of hydraulic cylinders.
Aerospace: In the aircraft hydraulic system, ensure the stable operation of key components.
Industrial equipment: In injection molding machines, die-casting machines and other equipment, precise control of oil is achieved.
5. Precautions for use
Installation direction: Make sure the valve body arrow pointing in line with the oil flow direction to avoid system failure caused by reverse installation.
Control oil circuit: The control oil port X needs to be connected to a stable pressure oil source to ensure that the valve core is opened reliably.
Oil drain treatment: The SL type check valve needs to be connected to an external oil drain port to ensure that the oil drain is unobstructed and avoid back pressure affecting the valve core movement.
Pressure matching: The working pressure should be lower than the rated value to avoid damage to the valve body due to overpressure use.
Maintenance: Check the wear of the valve core and valve seat regularly, replace the seals in time to ensure sealing performance.
6. Model and selection suggestions
SV type: suitable for internal oil drainage occasions, compact structure and easy to install.
SL type: suitable for systems that require external oil drain ports, which are easy to maintain and debug.
Selection basis: Select the appropriate diameter and model according to system pressure, flow rate and installation space.
Select the appropriate opening pressure and oil drainage method according to the control requirements.
7. Advantages
High reliability: Use high-quality materials and precision processing to ensure long-term and stable operation.
Flexible control: Reverse flow is achieved through hydraulic control to meet the needs of complex working conditions.
Widely applicable: suitable for a variety of hydraulic systems and industrial equipment, with a wide range of applications.
