Figure 5-13 shows a sliding-spool valve. The valve element slides back and forth to block and uncover ports in the housing. Sometimes called a piston…
Figure 5-12, shows a simple poppet valve. It consists primarily of a movable poppet that closes against a valve seat. Pressure from the inlet tends…
Directional-control valves also control flow direction. However, they vary considerably in physical characteristics and operation. The valves may be a • Poppet type, in which…
Pressure switches are used in various applications that require an adjustable, pressure-actuated electrical switch to make or break an electrical circuit at a predetermined pressure.…
A counterbalance valve allows free flow of fluid in one direction and maintains a resistance to flow in another direction until a certain pressure is…
Sequence valves control the operating sequence between two branches of a circuit. The valves are commonly used to regulate an operating sequence of two separate…
These valves limit pressure on a branch circuit to a lesser amount than required in a main circuit. For example, in a system, a branch-circuit…
Relief valves are the most common type of pressure-control valves. The relief valves’ function may vary, depending on a system’s needs. They can provide overload…
A pressure-control valve may limit or regulate pressure, create a particular pressure condition required for control, or cause actuators to operate in a specific order.…
Hydraulic power is an efficient method of delivering HP by pumping a fluid through a closed system. If the amount of flow or the pressure…