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