C
Cooler (Oil) - A heat exchanger which removes heat from a fluid. (See “Heat Exchanger.”) Corrosion Inhibitor - A compound or material deposited as a film on a metal surface that either provides physical protection against corrosive attack. Coupler - A device to connect two hoses or lines, or to connect hoses to valve receptacles. Cushion Valve - Cushion Valves (or crossover relief valve). These valves absorb pressure spikes caused if a motor or cylinder is brought to an abrupt stop while moving a heavy load. Both the inlet line and the outlet line are connected to each other inside the valve body by two relief valves, each facing opposite the other. If a spike occurs, the valve can discharge the flow to the opposite line. There are four ports on the cushion valve - two are connected to the cylinder or motor, and two are connected to the control valve, and slows down the piston. Cracking Pressure - The pressure at which a relief valve, etc., begins to open and pass fluid. Cross tube - Small pieces of pipe welded to the base plate or the rod of a cylinder which serve as a means to attach a cylinder to an application. Cycle - A single complete operation of a component which begins and ends in a neutral position. Cylinder - A device for converting fluid power into linear or circular motion. Referred to as an “actuator”. Customers also refer to these as “pistons” “rams” and “pushrods.” D Dead head - A situation that occurs when pressure within a system is stopped or blocked with no place to relief. Pump flow continues to build pressure until something gives way within the system, and thus resulting in damage. Detent - A device which maintains a preselected spool position (either “in” or “out”) on a directional control valve. Differential Pressure - The difference in pressure between any two points in a system or a component. (Also called a “pressure drop.”) Direct-Acting Solenoid Valves - The armature is directly linked to the spool and provides the physical force for lifting. Directional Control Valve - A valve which directs oil through selected passages. (Usually a spool or rotary valve design.) Displacement - The volume of oil displaced by one complete stroke or revolution (of a pump, motor, or cylinder). Usually expressed as CIR (cubic inches per revolution). For example, if a motor rated is at 2.2 CIR, this indicates that for every revolution, the motor displaces or expels 2.2 cubic inches of fluid. Double-Acting Cylinder - A cylinder in which fluid power can be exerted on both sides of the piston. Sometimes referred to as “power up, power down”. This cylinder can be controlled in both the extend and retract phases. Double pump - Two pumps in one housing. Two separate inlets and outlets are utilized. One shaft drives both pumps. There is a pump at the shaft end and one at the cover end. Drift - Motion of a cylinder or motor due to internal leakage past components in the hydraulic system. Dust Cap - A removable device that protects the male tip half when disconnected from the female coupling half. Excludes contamination. Dry Armature Coils - The coils operate in a dry environment, protected by solenoid housing. Dynamic - Capable of movement or motion Dynamic Seal - This is a seal that seals a moving surface like a rod or a barrel.
E
Eccentric - Uses a locking ring that fits onto the outside of the bearing, when the ring is rotated up to 180 degrees, the shaft is secured to the bearing. The letters HC indicate eccentric collar. Electro-Hydraulic / Solenoid Valve - A valve that is opened and closed by a solenoid. Extended length - The length of a cylinder measured from the center of the mounting hole on the rod end to the center of the mounting hole on the base end when the piston and rod are in the “out” position. The longest overall length of a cylinder.
For pricing, please refer to our website at Baileyhydraulics.com or call one of our Customer Experience Specialists at 1-800-800-1810. 181
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