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accumulator
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Hydraulic components used to store hydraulic fluid. Accumulators are designed to increase or relieve pressure in the system.
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cage
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A protective structure that separates a working machine tool from the operator. Cage doors must be closed in order for the machine to operate.
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check valve
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A hydraulic control valve that allows fluid to flow in one direction.
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contaminant
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Any foreign substance that may cause a loss of efficiency or a breakdown in a fluid system.
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Control of Hazardous Energy
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OSHA's proper title for the lockout/tagout safety standard. The standard protects employees by requiring practices and procedures that prevent accidental machine startup for machines that are undergoing maintenance.
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cylinder
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A type of linear actuator that uses a piston to produce motion in a straight line. A cylinder is also known as a piston actuator.
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earplug
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A protective device that blocks excessive noise from entering the ear. Earplugs vary in type and can be made from wax, cotton, foam, silicone, and rubber.
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electrical energy
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The energy created by the movement of electrons. Electrical energy can be converted into light, heat, or motion.
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emergency cut-off valve
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A safety device that halts all hydraulic action immediately. An emergency cut-off valve is located between the pump and the master valve in a hydraulic system.
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first degree burn
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A mild burn that affects the first layer of skin.
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force multiplication
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The exponential increase in available power usually associated with tools and power transmission systems.
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four-hand control
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A control that requires two operators to start and stop the machine. Four-hand controls are used as a safety precaution and can be pilot valves or electric push buttons.
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Frostbite
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Partial freezing of the body tissue. Frostbite is caused by exposure to extremely cold temperatures.
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gloves
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Protective hand covers that reduce the risk of injury and exposure to high temperature fluids.
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gown
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A protective body cover that reduces the risk of exposure to fluids and debris.
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hand pump
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A manual device that actuates valves in hydraulic systems. A hand pump can be used instead of a hydraulic pump.
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hydraulic safety valve
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A safety device that relieves excess pressure in a hydraulic system. Hydraulic safety valves are used used in conjunction with a rotating cylinder and a check valve.
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hydraulic system
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A power transmission system that uses the force of flowing liquids to transmit power.
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injection injury
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A puncture of the skin or body tissue caused by high-pressure fluid.
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kinetic energy
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Energy of motion.
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lockout device
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A device that uses positive means such as a lock and key or combination lock to hold an energy-isolating mechanism in a safe position and prevent equipment or machinery from being energized.
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lockout/tagout
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The common term for OSHA's Control of Hazardous Energy Standard. Lockout/tagout practices protect employees by preventing accidental machine startup through proper locking and labeling of machines that are undergoing maintenance.
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mask
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A protective cover that protects mucous membranes such as the nose and mouth from exposure to fluid, toxic fumes, dust, and debris.
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master valve
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A directional control valve used in hydraulic and pneumatic systems. Master valves are typically three-way or four-way valves.
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material safety data sheet
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Mandatory information that must accompany almost every chemical in the workplace except for items like cleaning supplies. An MSDS includes details such as the hazards, precautions, and first-aid procedures associated with the chemical.
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National Institute for Occupational Safety and Health
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A division of the Centers for Disease Control that is responsible for conducting research for the prevention of work-related illnesses and injuries. The National Institute for Occupational Safety and Health is abbreviated as NIOSH.
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Occupational Safety and Health Administration
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The United States government agency that regulates the conditions in working environments to ensure the health and safety of employees. The Occupational Safety & Health Administration is abbreviated as OSHA.
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Pascal's Law
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A hydrostatic principle that states when pressure is applied to a contained fluid, the force is transmitted equally in all directions.
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personal protective equipment
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Any example of various safety equipment that workers wear or use to prevent injury in the workplace. Safety glasses, gloves, masks, gowns, and earplugs are common personal protective equipment (PPE).
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pilot valve
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A valve that actuates the master valve.
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pinhole leak
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The loss of hydraulic or pneumatic fluid through a small hole, usually found on a fluid conductor. Pinhole leaks can reduce system efficiency and cause serious injection injuries.
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pneumatic system
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A power transmission system that uses the force of flowing gases to transmit power.
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potential energy
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Stored energy resulting from an object's position or from internal pressure.
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preventive maintenance
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Maintenance performed while a machine is in working order to keep it from breaking down.
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protective eyewear
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Eye covers that reduce the risk of injury and exposure to fluid, dust, and debris. Protective eyewear includes goggles and safety glasses.
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psi
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Pounds per square inch. Pounds per square inch is a unit of measurement for pressure.
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pump
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A mechanical device used to move liquids and gases.
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safety clip
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A latch on a power tool that prevents the trigger from being depressed. Safety clips can also secure the tool to the fluid line.
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second degree burn
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A more severe burn that affects the first and second layers of skin.
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tagout device
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A prominent warning device, such as a tag, that can be securely attached to an energy-isolating mechanism to alert employees that equipment is not to be operated until the tag is removed.
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thermal energy
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Energy resulting from the motion of particles. Thermal energy is a form of kinetic energy and is transferred as heat.
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third degree burn
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The most severe type of burn that affects the first, second, and third layers of the skin.
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two-hand control
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A control that requires both of an operator's hands to start and stop the machine. Two-hand controls are used as a safety precaution and can be pilot valves or electric push buttons.
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