Tapered Thread : A tapered thread is narrow at the front and becomes slightly wider at each thread pitch. Tapered threads are designed to seal at the thread itself and typically no O ring or bonded washer is used
TEE : A tee is a pipeline outlet at 90 degrees to the pipeline shaped like a "T" to fluid or gas media to be taken from the pipeline. Commonly used to replace large expensive 3 way solenoid valves by installing a T piece and two low cost 2/2 way solenoid valves on each leg or outlet, giving the advantage of total control of flow, both ports open or both ports closed, unlike a three way valve which is typically open to one or the other outlet.
Temperature : Temperature is a measurement of heat intensity, a very important factory when using valves to control a fluid or gas. The minimum and maximum media and ambient temperatures are normally required to assist in selecting the correct valve for the application. Temperature is typically measured in degrees Centigrade or degrees Fahrenheit.
Temperature Rating : The maximum or minimum working or operating temperature range of equipment typically given as degrees Centigrade or degrees Fahrenheit.
Tensile Strength : Tensile strength (TS) sometimes referred to as (UTS) Ultimate Tensile Strength is the maximum amount of tensile stretching or pulling "tension" force that a valve, pipework or material can withstand before rupturing, cracking or breaking.
Test Certificate : A test certificate, letter or document supplied by the valve manufacturer to document and certify that the equipment has been tested. Testing may involve pressure, function, sealing and or operation depending on the test certification requested. Test certificates should always be requested during the quotation stage so that the valve supplier or manufacturer may perform the test and the customer aware of the additional charges commonly applied.
Threaded Solenoid Valves : Typically an internal thread measured by size and thread type, for example 1/4" BSP thread would be 1/4" British standard pipe thread as found in most of Europe and sometimes referred to a "G" or in this case G1/4", in most parts of America NPT (National Pipe Taper) is the common thread and in most parts of Asia PT is the common thread.
Throttling Valve : A throttling valve is designed to restrict, reduce, regulate or control the flow of media rather than simple open or closed operation.
Thru Conduit : Through conduit is the terminology associated to a valve typically a ball valve where the passage or flow path through the valve is smooth or clear without any obstacle, obstruction, cavities or gaps to either restrict media flow or trap debris.
Thrust : Thrust is a force or push applied in one direction, such as the force exerted on a valve piston or solenoid valve armature assembly.
Tight Shut Off. (TSO) : A tight shut off valve is a valve that can close virtually leak free. Typically found on single seat valves (one sealing face) as double seat valves (two sealing faces) can leak between 1 to 3%. See bubble tight valves for better sealing.
Timer : Timers are electrical or sometimes mechanical devices installed into electrical circuits that control the electrical power supply to the valve and will offer a pre-set adjustable automated control for valves.
Torque : Torque is the measure of force or turning power typically measured in Kg/Cm Kilograms per centimetre or Ft/Lb foot / pounds, being the load or weight applied at a distance from the shaft axis. For example 50 foot pounds equates to 50 lbs applied to the end of a 12" or 1 foot long wrench or lever.
Torque Switch : A torque switch is a safety switch commonly found on electric motors in electric actuators that is designed to cut electrical power to the electric motor if the applied torque or turning forces of the motor are exceeded.
Torsional Spring : A torsional spring is a spring that is wound around a shaft or twisted to exert a rotational force or torque. Torsional springs are found in non return swing check valves and spring return actuators where the spring will automatically mechanically return the valve back to its default position.
Trim : Valve trim refers to the working parts of a valve, a solenoid valve trim would be the solenoid armature, core tube, seals and gaskets.
Trunnion : A trunnion are the ball valve parts that hold the internal rotating ball in a stable vertical axis, i.e. the same axis as the stem.
Turns to Operate : The number of turns to operate a rotating valve hand wheel, T bar, stem or shaft to move the valve from the ully open to the fully closed position, or visa versa. Most actuated valves will utilise a gear box to reduce the require torque but in doing so will increase the number of turns to operate according to the gear ratio.
U- CUP or Ring Packing : A "U" shaped ring found in some valves where grease can be pumped to seal the valve during an emergency, known as Emergency Seat Sealing.
UL Approval : UL is an American independent safety (Underwriters Laboratories) certification. A UL listing means that UL have tested samples of the product and determined that it meets UL's requirements. These requirements are based primarily on UL's published and nationally recognised American Standards of Safety. UL approved solenoid actuated valves can be verified by their UL number at the UL database on-line.
Ultimate Strength : The ultimate strength of a valve or material is the maximum applied stress at which the valve or material will break.
Ultrasonic Inspection : An ultrasonic inspection procedure using ultrasonic or high frequency sound waves to view the internal structure of metal castings and welds to locate imperfections, voids and cracks.
Underground Storage : Underground storage tanks (UST) have at least 10% of their structure under ground level or surface of surrounding soil and are connected to pipelines as an underground storage facility for liquids or gases.
Unions : A union is a pipeline pressure tight metal to metal faced two piece joint or union with a threaded connecting sleeve that applies sealing force between the two connecting metal faces. This allows a pipe to be disconnected without the need to rotate or remove any of the existing connecting pipework.
Union Bonnet : A valve bonnet or top cover that in screwed onto the valve body rather than bolted. Typically found on gate valves where the valve bonnet can be unscrewed for maintenance.
Universal : A universal solenoid valve is a function typically associated to a 3/2 way universal solenoid valve, whereby the inlet port can be any of the three ports with flow in any direction.