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Chapter 4 Hydraulic Control Components Mind Map
This is a mind map about Chapter 4 hydraulic control components, including directional control valves, pressure control valves, flow control valves, etc. Hope it helps you
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Chapter 4 Hydraulic Control Components Mind Map
- bacteria
This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
- Plant asexual reproduction
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- Reproductive development of animals
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- Outline
Hydraulic control components
Directional control valve
One-way valve: controls the one-way flow of oil
Ordinary one-way valve
Oil enters from the left end, and the pressure oil acts on the left end of the valve core. It overcomes the spring force at the right end to move the valve core to the right. The valve port opens and oil flows out from the right end. If oil enters from the right end, the pressure oil and the spring act in the same direction, pressing the valve core tightly. On the valve seat hole, the valve port is closed, and the oil is blocked and cannot pass through.
The pressure loss is small when the forward liquid flow passes through, and the sealing performance is good when the reverse flow is cut off.
Hydraulic controlled one-way valve: It has the function of an ordinary one-way valve and can flow in one direction under controlled conditions.
Directional valve: Utilizes the relative movement of the valve core to the valve body to connect the oil circuit, cut off or change the direction of the oil flow, thereby realizing the start, stop or change of movement direction of the hydraulic actuator and its driving mechanism.
Slide valve type reversing valve
Manual reversing valve: The control handle directly controls the movement of the valve core to realize oil circuit switching. The reversing accuracy and smoothness are not high. It is often used in situations where reversing is infrequent and automation is not required.
Motorized reversing valve: also known as stroke valve, it uses a stopper or cam installed on the workbench to force the valve core to move to control the direction of the liquid flow. It has high reversing accuracy and small impact, and is suitable for systems with large speed and inertia.
Electromagnetic reversing valve: It uses the electromagnet to energize and release and directly push the valve core to control the direction of the liquid flow. The thrust is limited and is suitable for small flow systems.
Hydraulic reversing valve: uses the pressure oil in the control oil circuit to change the position of the valve core. It has a large driving force and is suitable for systems with large flow rates.
Electro-hydraulic reversing valve: It is composed of an electromagnetic reversing valve and a hydraulic reversing valve. The electromagnetic reversing valve changes the direction of the hydraulic valve to control the oil circuit and is called a pilot valve; the hydraulic reversing valve realizes the reversal of the main oil circuit. , called the main valve; it combines the advantages of solenoid valves and hydraulic valves, with easy control and large flow.
Rotary valve type directional valve
pressure control valve
Hydraulic valve that controls the level of oil pressure
relief valve
Direct-acting relief valve: relies on the pressure oil in the system to directly act on the valve core to balance with the spring force to control the opening and closing action of the valve core.
Ignore the hydraulic force, self-weight of the valve core and friction.
Pilot-operated relief valve: It consists of a pilot valve and a main valve. The pilot valve is actually a small-flow direct-acting relief valve with a poppet valve core.
application
Pressure regulating valve: connected to the outlet of the pump to ensure constant system pressure
Safety valve: Bypassed at the outlet of the pump, it is used to limit the maximum pressure of the system and protect the system.
Unloading valve: When the remote control buckle is connected to the fuel tank through the two-position two-way electromagnetic reversing valve, it unloads the pump when the actuator is not working.
Back pressure valve: The relief valve is connected to the outlet of the actuator to ensure the smooth movement of the system.
Pressure reducing valve: uses liquid flow to generate pressure loss through the gap, so that the outlet pressure is lower than the inlet pressure
Fixed value pressure reducing valve
Direct acting pressure reducing valve
Pilot-operated pressure reducing valve: The pilot valve regulates pressure, and the main valve reduces and stabilizes pressure; when the set pressure of the pilot valve is greater than the inlet pressure of the pressure reducing valve, the pressure reducing valve does not work.
Fixed difference pressure reducing valve: After the spring force is adjusted, the pressure difference remains constant, so that the inlet and outlet pressure difference remains at a constant value. It is used for speed regulating valves.
Sequence valve: controls the sequence of actions of each actuator in the hydraulic system
Direct-acting internal control sequence valve: Internal control refers to using the oil inlet pressure of the valve to control the opening and closing of the valve core.
Direct-acting external control sequence valve
Pilot operated sequence valve
Application: As a back pressure valve: connected in series on the oil return path of the actuator, so that the return oil has a certain pressure to ensure smooth movement of the actuator
Pressure relay: an electro-hydraulic control element that converts the oil pressure signal into an electrical signal. The pressure when the signal is sent is called the opening pressure, and the pressure when the electrical signal is cut off is called the closing pressure. The opening of the pressure relay can be adjusted by adjusting the screw. pressure
flow control valve
Flow adjustment is achieved by changing the size of the valve port to change the liquid resistance
throttle valve
orifice
Thin-walled holes: best performance
elongated holes
Thick walled holes
Orifice structure
Needle valve type
Axial (circumferential) triangular groove type
Circumferential (axial) slot type
Stiffness: the ability to resist interference from load changes and maintain stable flow
Features and applications: Due to poor rigidity of ordinary throttle valves, the working flow through it is affected by changes in the working load (i.e. outlet pressure) under certain conditions of the throttle opening, and cannot maintain the stability of the movement speed of the actuator, so it is only suitable for working Occasions where load changes are not large and speed stability requirements are not high
Pressure compensation: Take measures to make the pressure difference before and after the throttle valve remain unchanged when the load changes. One is to connect the fixed difference pressure reducing valve and the throttle valve in series to form a speed control valve; the other is to connect the pressure-stabilizing relief valve Connected in parallel with the throttle valve to form overflow throttling
Speed regulating valve: a fixed difference pressure reducing valve and a throttle valve connected in series
Static characteristics: The minimum working pressure difference should be maintained above 0.4-0.5MPa
Application: Load changes, speed control systems with high requirements on motion stability
Relief throttle valve: pressure compensation throttle valve, which is a variable voltage system. It has the advantages of low power loss, low heat generation, high efficiency, and is suitable for throttling and speed regulation systems with high requirements for smooth motion and high power.
Temperature compensated speed regulating valve