Chapter 5 Hydraulic Control Valves Chapter list 5.1 Introduction 5.2 Directional Control Valves 5.3 Pressure Operated Valves 5.4 Flow Control Valves 5.5 Manifold Valves and Cartridge Valves 5.6 Electro-Hydraulic Servo Valves 5.7 Electro-Hydraulic Proportional Valves 5.8 Electro-Hydraulic Digital Valves Homepage List Upwards Dowrwards Retum Exit
Chapter 5 Hydraulic Control Valves 1 5.1 Introduction 5.2 Directional Control Valves 5.3 Pressure Operated Valves 5.4 Flow Control Valves 5.5 Manifold Valves and Cartridge Valves 5.6 Electro-Hydraulic Servo Valves 5.7 Electro-Hydraulic Proportional Valves 5.8 Electro-Hydraulic Digital Valves Chapter list
Chapter 5 Hydraulic Control Valves 5.1 Introduction 5.1.1 Basic characteristics 5.1.2 Classification 5.1.3 Basic requirements for hydraulic valves Homepage List Upwards Downward止s Retumn Exit
Chapter 5 Hydraulic Control Valves 2 5.1 Introduction 5.1.1 Basic characteristics 5.1.2 Classification 5.1.3 Basic requirements for hydraulic valves
Chapter 5 Hydraulic Control Valves 5.1 Introduction The types of control valves used today are too numerous to be mentioned.Most valves,however,perform three primary functions in the hydraulic system:to control the oil pressure (pressure control valves),the flow rate(flow control valves)and the direction of oil flow(directional control valves)in the system to ensure the actuators in proper working on order the load requested. 5.1.1 Basic characteristics Although there are many types of hydraulic control valves and they might be quite different from each other in either the functions or configurations,there exist basic characteristics. Homepage List Upwards Downward达 Return Exit
Chapter 5 Hydraulic Control Valves 3 5.1 Introduction 5.1.1 Basic characteristics The types of control valves used today are too numerous to be mentioned. Most valves, however, perform three primary functionsin the hydraulic system: to control the oil pressure (pressure control valves), the flow rate (flow control valves) and the direction of oil flow (directional control valves) in the system to ensure the actuators in proper working on order the load requested. Although there are many types of hydraulic control valves and they might be quite different from each other in either the functions or configurations, there exist basic characteristics
Chapter 5 Hydraulic Control Valves 1.In structure,all hydraulic control valves consist of the valve body,the valve core(spool,cone or ball)and the operating elements used to control the valve core. The three basic types of cores are shown in Fig.5-1. 2.In operating principle,the orifice flow formula should be kept true for the orifice size,the pressure differences between the inlet and outlet and the flow rate of through the valves. Homepage List Upwards Downwards Retum Exit
Chapter 5 Hydraulic Control Valves 4 1. In structure, all hydraulic control valves consist of the valve body, the valve core (spool, cone or ball) and the operating elements used to control the valve core. The three basic types of cores are shown in Fig.5-1. 2. In operating principle, the orifice flow formula should be kept true for the orifice size, the pressure differences between the inlet and outlet and the flow rate of through the valves
Chapter 5 Hydraulic Control Valves b) c) Fig.5-1 Configuration types a)Spoolvalve b)Cone valve c)Ball valve 5.1.2 Classification The hydraulic control valves can be categorized according to different classification attributes,see Tab.5-1 Homepage List Upwards Downward达s Return Exit
Chapter 5 Hydraulic Control Valves 5 Fig. 5-1 Configuration types a) Spool valve b) Cone valve c) Ball valve 5.1.2 Classification The hydraulic control valves can be categorized according to different classification attributes, see Tab.5-1