Hydraulic Terms KLM speaks to hydraulic phrases KLM and hydraulic glossary KLM are words and phrases in common use in the hydraulic industry.
Kinetic Energy Energy in the kinetic state is moving and it is an indication of the amount of work done or the amount of work an object can do.
Law of Conservation of Energy This principle says that energy can neither be created nor destroyed although it may change from one form to another.
Liquid Molecules As in all liquids petroleum Base hydraulic fluid is made up of molecules which are attracted to one another.
Load Lock Valve This is a two pilot operated check valves in one valve body.
Lubrication Lubrication is a process used to reduce friction between moving surfaces which are in contact. It is very important of hydraulic fluid as friction will cause systems components to wear excessively and excessive heat to be generated.
Lubricity Lubricity refers to a liquid’s ability to form a durable fluid film between contacting surfaces This ability is related to a fluid’s natural film thickness and a fluid’s tendency to adhere to a surface. Petroleum oil has good lubricity.
Lunge Control This is the proper operation of a pressure compensated of temperature pressure flow control valve. It depends on the compensator spool partially restricting flow to the orifice and the transferring of excess pressure into heat.
Makeup Check Valves In a bidirectional motor circuit, supply liquid to the motor inlet during braking is usually done with low pressure check valves positioned in each line.
Mechanical Motions Cylinders convert hydraulic working energy into straight line, linear or mechanical motion. Depending on the way in which they are attached to mechanical linkages, cylinders provide many different mechanical motions.
Meter In Circuit This circuit is used to control the speed of an actuator which works against a positive load. In other words, while the orifice is metering fluid to an actuator, the workload pressure is continuously a positive value. An example of a constant load would be any load that is vertically lifted.
Meter Out Circuit
In some cases, the work load changes direction or the work load
pressure suddenly changes from full to zero pressure, such as a drill
breaking through stock. This causes the cylinder to run away. A flow control
valve placed at the outlet port of an actuator controls the rate of flow exiting
the actuator. This is a meter out circuit anf gives positive speed control to
actuators used in drilling, sawing boring and dumping.
Motor A device which converts low pressure fluid power into higher pressure fluid power.
Hydraulic Terms KLM
Motor Cavitation A motor will cavitate the same as a pump if a sufficient supply of fluid is not received at its inlet port while turning.
Motor Drains Motors used in industrial hydraulic systems are almost exclusively designed to be bidirectional. Even motors which operate in a system in only one direction are probably bidirectional motors in design. To protect its shaft seal, vane, gear and piston bidirectional motors are generally drained.
Non Jump Control This is a type of lunge control.
Needle Valve The fluid going through a needle valve must turn 90 degrees and pass through an opening which is the seat for a rod with a cone shaped tip. The size of the opening is changed by the positioning of the cone in relation to its seat. The orifice size can be changed very gradually because of fine threads on the valve stem and the shape of the cone. A needle valve is the most frequently used variable orifice in an industrial hydraulic system.