Chapter 5 Hydraulic Control Valves Tab.5-1 Classification of hydraulic control valves Classification Contents attributes Types The pressure Relief,pressure reducing,sequence, proportional pressure control,pressure control switch,etc Throttle,speed control,overflow throttle, The functions The flow control dividing,combining,proportional flow control,etc Check,pilot-operated check,directional, The directional proportional direction change,etc control Manually Handle or handwheel,pedal,lever The Skid,spring,hydraulic,pneumatic manipulatio Mechanically n The solenoid-operated,electro-hydraulic Electrically control Homepage List Upwards Downward达 Return Exit
Chapter 5 Hydraulic Control Valves 6 Tab.5-1 Classification of hydraulic control valves Classification attributes Types Contents The functions The pressure control Relief , pressure reducing, sequence, proportional pressure control, pressure switch, etc The flow control Throttle, speed control, overflow throttle, dividing, combining, proportional flow control, etc The directional control Check, pilot-operated check, directional, proportional direction change, etc The manipulatio n Manually Handle or handwheel, pedal, lever Mechanically Skid, spring, hydraulic, pneumatic Electrically The solenoid-operated, electro-hydraulic control
Chapter 5 Hydraulic Control Valves Tab.5-1 Classification of hydraulic control valves The tubing The tubing and the flanged Sub-plate mounting or Single/double-plate mounting, Connection modular integration and sandwich valves The cartridge The screw,and the flanged The constant control The pressure control,the flow valves or switches control,the directional control The electro-hydraulic The electro-hydraulic pressure/flow/directional/combined proportional control valves Control The electro-hydraulic,air-hydraulic, The servo-control mechanical-hydraulic The digital control pressure/flow/ The digital control directional control valves Homepage List Upwards Dowrwards Return Exit
Chapter 5 Hydraulic Control Valves 7 Tab.5-1 Classification of hydraulic control valves Connection The tubing The tubing and the flanged Sub-plate mounting or modular Single/double-plate mounting, integration and sandwich valves The cartridge The screw, and the flanged Control The constant control valves or switches The pressure control, the flow control, the directional control The electro-hydraulic proportional control The electro-hydraulic pressure/flow/directional/combined valves The servo-control The electro-hydraulic, air-hydraulic, mechanical-hydraulic The digital control The digital control pressure/ flow/ directional control valves
Chapter 5 Hydraulic Control Valves 5.1.3 Basic requirements for hydraulic valves 1.Sensitive,credible,and low impact and vibration; 2.Low resistance when the orifice is opened completely, and has good sealing ability when the orifice is closed; 3.Controllable parameters(such as the pressure and the flow rate)should be stable and insensitive under disturbance; 4.Compact in structure and good in installation, adjustment and applications 8 Homepage List Upwards Downwards Return Exit
Chapter 5 Hydraulic Control Valves 8 5.1.3 Basic requirements for hydraulic valves 1. Sensitive, credible, and low impact and vibration; 2. Low resistance when the orifice is opened completely, and has good sealing ability when the orifice is closed; 3. Controllable parameters (such as the pressure and the flow rate) should be stable and insensitive under disturbance; 4. Compact in structure and good in installation, adjustment and applications
Chapter 5 Hydraulic Control Valves 5.2 Directional Control Valves 5.2.1 In-line Check 5.2.2 Directional control valves Homepage List Upwards Dowrwards Retun Exit
Chapter 5 Hydraulic Control Valves 9 5.2 Directional Control Valves 5.2.1 In-line Check 5.2.2 Directional control valves
Chapter 5 Hydraulic Control Valves 5.2 Directional Control Valves There are two types of general directional control valves:in-line check and direction changing. 5.2.1 In-line Check The in-line check valves include:the general type checks and hydraulic operated check valves. 1.The in-line check valves of general type Functions:This valve allows free flow in one direction and prevents flow in the reverse direction Fig.5-2 shows a general type check valve in a threaded pipe connection. 10 Homepage List Upwards Downwards Return Exit
Chapter 5 Hydraulic Control Valves 10 5.2 Directional Control Valves There are two types of general directional control valves: in-line check and direction changing. 5.2.1 In-line Check The in-line check valves include: the general type checks and hydraulic operated check valves. 1. The in-line check valves of general type Functions: This valve allows free flow in one direction and prevents flow in the reverse direction. Fig.5-2 shows a general type check valve in a threaded pipe connection