Hydraulics Glossary: T

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A glossary of the key terms you may encounter when working with hydraulic systems. Introducing the letter 'T'…

TANDEM-CENTRE VALVES:
Using tandem centre valves when in a neutral position bypasses the flow of hydraulic oil to the return line. This is used to hold the hydraulic cylinder/piston in position with no load on the pumps. With this system the hydraulic pump is running constantly to keep a ready supply of hydraulic oil, but as long as the hydraulic cylinder/piston is not in operation the hydraulic pump is working under no pressure or load. This system keeps wear and tear on the hydraulic pump down to a minimum.
TANK:
See also under RESERVOIR.
A digital device that opens or closes a switch when the internal temperature changes state to a pre-set temperature limit.
Hydraulic pressure caused by expansion of the fluid due to heat from an external source such as sunlight.
THREE WAY:
A term used to describe a valve that has three ports, normally a pressure (inlet) port, a normally closed (n.c.) port and a normally open (n.o.) port. Used to block or open a common flow passage.
A valve with a three way functional capability that may be manually activated to directly control the operating spool. Movement of the spool from extreme end to extreme end reverses the flow paths of the ports.
A hydraulic valve with a three-way functional capability that may be proportionately actuated by a solenoid to control the operating spool in infinite resolution. Movement of the spool from extreme end to extreme rod completely reverses the flow paths of the ports.
A hydraulic valve with a  three way functional capability that may be solenoid activated to directly control the operating spool. Movement of the spool from extreme end to the other reverses the flow paths of the ports.
A valve with three-way functional capability that may be solenoid activated to directly control the operating spool which then controls a secondary, larger spool. Movement of the secondary spool from extreme end to extreme end reverses the flow paths of ports.
A spool valve with three ports.
A metal rod used to prevent two or more components from separating. Normally used to restrain the end plates of cylinders against the cylinder tube.

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Other nomenclature ‘male tip’, ‘nipple’, ‘plug’, ‘male half’.
The force exerted in rotation. The measure of force applied to a lever arm. Normally expressed in pounds/feet (lb/ft) or pounds/inches (lb/in).
A rotary fluid coupling that is capable of multiplying torque.
An analogue device that produces a change in signal level during state changes. Normally used for high speed control systems.
Pressurised fluid trapped behind closed valving in one of the quick-action coupling mating halves.
A type of hydraulic fluid conductor that joins other hydraulic components usually in a non-linear fashion. Despite being stronger than pipe, tubing is easily bent. Tube is available in varied wall thickness and is measured by its outside diameter.
A rotary device that is powered by the force of a moving fluid against blades or vanes.
A term used to describe a valve that has two ports, normally a pressure (inlet) port and an outlet port. Used to open or close a flow passage. May be configured as normally closed (n.c.) Or normally open (n.o.).
A valve with two-way functionality that may be solenoid activated to directly control the operating spool. Movement of the spool from extreme end to extreme end opens or closed the flow paths of the ports.
A valve with two-way functionality that may be manually activated to directly control the operating spool. Movement of the spool from extreme end to extreme end opens or closed the flow paths of the ports.
A valve with a two-way functional capability that may be solenoid activated to directly control the operating spool which then controls a secondary, larger spool. Movement of the secondary spool from extreme end to extreme end opens or closes the flow paths of the ports.

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