Hydraulic Terms A, Hydraulic words A, Hydraulic phrases A

Hydraulic Terms A speaks to hydraulic words A and hydraulic phrases A that designers, manufacturers, suppliers, sales and service people use in the hydraulics industry.

Absolute Pressure The gage is used to measure pressure and begins at the point where there is a complete absence of pressure. The units of measurement can be either psi or mm hg.

Accumulators This is a device used to apply a pressure to a confined liquid consisted of a movable piston on which the force is applied and a cylinder body to confine the liquid. An accumulator may store hydraulic pressure which is potential energy and this pressure can turn to working energy (flow and pressure).

Accumulator Bladder Type A bladder type accumulator consists of a synthetic rubber bladder inside a metal shell as the bladder contains the gas. As fluid enters the shell, the gas in the bladder is compressed. Gas pressure decreases as fluid flows from the shell. When all liquid has been discharged, gas pressure attempts to push the bladder through the outlet. As the bladder contacts the poppet valve at the outlet, flow from the shell is automatically shut off.

Accumulator Diaphragm Type A diaphragm type accumulator consists of two metal hemispheres which are bolted together, but whose interior volume is separated by a synthetic rubber, gas occupies the space. As fluid enters the other chamber, gas is compressed. Once all liquid has been discharged, the diaphragm covers the outlet retaining the gas within the accumulator. The diaphragm will not be pushed through the thickness of the diaphragm.

Accumulator Hydro Pneumatic A hydro pneumatic accumulator is the most commonly used in industrial hydraulic systems. This type accumulator applies a force to a liquid by using compressed air. There are two types, diaphragm and bladder. The name of each type indicates the device separating gas from liquid.

Accumulator Piston Type A piston type accumulator consists of a cylinder body and movable piston with resilient seals. Gas occupies the volume above the piston and is compressed as the cylinder body is charged with fluid. As fluid flows from the accumulator, gas pressure drops. When all liquid has been discharged, the piston has reached the end of its stroke and it covers the outlet keeping the gas within the accumulator.

Accumulator Spring Loaded A spring loaded accumulator applies a force to its stored liquid by means of a spring acting on a piston.

Hydraulic Terms A

Actuator, pneumatic/hydraulic A device in which power is transferred from one pressurized medium to another without intensification.

Additive A chemical added to a fluid to impart new properties or to enhance those which already exist.

Air Bleeder A device for the removal of air.

Air Breather A device permitting air movement between atmosphere and the component in which it is installed.

Air Cooler In an air cooler, fluid is pumped through tubes to which fins are attached. To dissipate heat, air is blown over the tubes and fins by a fan. The operation is exactly like an automobile radiator. Air coolers are generally used where water is not readily available or is too expensive.

Air Gap Solenoid This solenoid is basically an electromagnet made up of a T plunger and frame around the coil, this is sometimes called a CT solenoid. This the older kind of solenoid.

Antifoam Additives These are antifoam additives added to hydraulic oil to prevent foaming. These additives work by combining small air bubbles into large bubbles which rise to a fluid surface and burst. With other additives these function by interfering with air release which action reduces foaming but increases the amount of air bubbles in the system.

Hydraulic Terms A

Antiwear Additives Antiwear (AW) also known Wear resistant (WR) additives are available in 3 types. Type one, is known as an oiliness or lubricity agent, is a chemical made up of molecules that attach themselves vertically to metal surfaces, and this creates a chemical film which acts as a solid when an attempt is made at penetration.

Type two, chemically combines with a metal surface to form a protective film. This film forms as low frictional heat is generated between contacting points of moving surfaces which serve to smooth out or polish surfaces so that friction is reduces. Type 3. Is an antiwear agent, known as an extreme pressure (EP) additive which forms a film on a metal surface as high frictional heat is generated.


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