Fabricated Valve : Fabricated valve in which the valve body and valve hub parts are not cast but are formed from sheet plate or pipe and then welded and or bolted together.
Face to Face : The valve length or overall dimension from the inlet face of the valve to the outlet face of the valve (one end to the other end). This dimension is governed by ANSI B16.10 and API—6D to ensure that such valves are mutually interchangeable, regardless of the manufacturer.
Facing : The finish of the front or contact surfaces of flanged fittings, pipework or flanged valves.
Fail-safe Valve : A valve designed to have a fail safe position by means of a return spring so that in the event of power failure the valve will "fail safe" into the desired position. A fail safe closed solenoid valve will automatically return to closed position, a fail-safe open solenoid valve will automatically return to the open position upon power failure.
F.A.S. Free Along Side : FAS or free along side shipping is a term used for sea freight shipping, vendor pays transportation charges to shipping dock alongside the ship.
Female Thread : A female thread is an internal thread ID Internal Diameter of a hole, a male thread will happily screw into a compatible female thread.
Field Serviceable Valve : A field serviceable valve is a valve that can be repaired or serviced whilst installed out in the field or on site, without the need to be returned to the valve supplier or manufacturer.
Fire Gate : A gate or isolation valve that is positioned in a pipeline that can be closed in case of fire and closing the valve prevents the gas in the pipeline from feeding the fire.
Fire Safe : Fire safe is a statement of valve design which indicates the valve is capable of passing certain specified leakage and operational tests after exposure to fire, typically referenced to a particular fire safe classification or specification.
Fittings : Fittings are small adaptors for connecting liquid or gas lines together, such as elbows, tees, nipples, unions, flanges, push in fittings, threaded adaptors and sockets.
FFKM seals : FFKM is an upgraded FKM (see below) elastomer seal with higher working temperature range up to +250°C and offers great chemical resistance to most solvents and chemicals, but being much more difficult to manufacture makes FFKM a very expensive valve seal option.
FKM seals : FKM known more often by its Brand name Viton® (Dupont Brand) as an Flour-elastomer seal which is a common option available with many solenoid valves.
FKM has excellent heat resistance to 150 degrees centigrade and is commonly used for hot water, acid, alkali, oils, hydrocarbons and salt solutions, Hydrocarbons, many aggressive chemicals, diluted acids, weak alkali's, mineral oils, aliphatic and aromatic hydrocarbons, chlorinated hydrocarbons, sunlight and ozone. FKM has poor resistance to Ketone's and Acetone.
Flange : A flange is a projecting radial collar with bolt holes allowing pipe connection without threads. Flanges are bolted together and provide a means of installing or removing process valves into or out of pipelines without the need to disassemble additional pipework upstream or downstream.
Flanged solenoid valves : Flanges are designated by flange type, pressure rating and size for example PN16 DN50 flange (diameter nominal) 50mm flange type PN with pressure rating 16 bar, alternatively an ANSI150Lb DN100 flange would be a flange type ANSI with internal diameter 100mm or 4" and a pressure rating of 150 psi.
Flat Face : A flange radial surface in which the gasket sealing area or end connecting face is completely flat without any raised point.
Flexible Tube Valve : A special valve using a flexible sleeve or tube which acts as the closure element. Pressure applied to the jacket space surrounding the outside of the tube, controls the opening and closing of the valve.
Float Valves : Pilot operated or float valve is remotely actuated by a small float valve that rises or drops as it floats at a tank water level. The opening or closing of this pilot floating valve directly controls the main tank inlet valve my means of this pilot pressure, without the need for external power supply or control.
Flow : Flow is the movement of liquid or gas media along a pipeline system.
Flow Coefficient : A measure of flow in gallons per minute of water at 20ºC that will flow through a valve with a pressure drop or pressure differential of 1 psi. Other measurements of flow coefficients such as Kv or litres per minute at 1 bar ΔP can also be used, when stipulated.
Flow Factors : Solenoid controlled valves are commonly assigned with a flow coefficient factor, which refers to the amount of media typically water that would be expected to pass though the valve in the open position under certain pressures. As flow rates vary according to system pressures valve users and design engineers can calculate the expected flow for any given valve according to their specific requirements.
Cv flow factor = gallons of water per minute at 60°F which will flow with a 1psig pressure difference. i.e. USGPM flow with 1 psi at inlet and outlet open ended or 10 psi inlet and 9 psi at outlet.
Flow Meters : A flow meter is an instrument designed to measure the flow rate or volume of media travelling along a pipe.
Flow Rate ( K Value) : Kv values or flow coefficients define the flow through a solenoid valve by the metric measurement of water in cubic meters an hour with a pressure differential of 1 bar (difference between inlet and outlet pressure across the solenoid valve) between 5 and 40 degrees Celsius.
Cv values or flow coefficients define the flow through a solenoid valve by the imperial measurement of water in US gallons per minute with a pressure differential of 1 PSI at 60 degree Fahrenheit.
Qn values or flow coefficients define the flow through a pneumatic solenoid valve by the metric measurement of air in litres per minute at 6 bar with 1 bar differential at 20 degree Celsius.
Fluid : A fluid is a liquid or second state of matter, the other states are first state solids which maintain shape and third state gases. Gases can be compressed such as air, oxygen, helium, nitrogen, argon. Liquids or fluids are the second state which are between solid and gas form, which can flow through a pipe or valve and cannot be compressed. Basic fluids would include water and oils etc. Most liquids when cooled sufficiently will condense into solids or when sufficiently heated will turn into a gas form.
F.O.B. Free On Board : Transportation charges are paid by the vendor to the F.O.B. point. Typically freight is FOB factory which means case, title and transportation charges pass to the customer or client at the point the shipment or freight leaves the factory.
Force (Newtons) : Force is measured in Newtons. When a solenoid coil is energised it will exert a magnetic pull or force upon the armature or "Pull in Force", as the plunger moves further into the magnetic field the force applied will increase until the maximum force is achieved at the end of the stroke.
Forging : A metal part that has been formed by heating close to melting point and hammered or pounded into a specific shape.
FPC - Federal Power Commission : FPC is the United States government agency that governs and regulates the natural gas and pipeline industry, as well as other energy industries.
Friction : Friction is the resistance to movement between two contacting surfaces, can also apply to liquids or gases passing along a pipe inner wall generating a drop in pressure ΔP.
Full Bore : A valve whose orifice or smallest point of flow is at least equal to or greater than the size of the connecting port, thus offering very high flow rate and greatly reduced pressure drop.
Full Opening : A valve whose orifice or bore is equal in size to the connecting port, allowing for full flow or similar to full bore.
Full Penetration Weld : Full penetration weld describes the type of weld wherein the weld metal extends across the entire wall thickness of the joint.
Function (Solenoid Valve) : The function of a solenoid valve is given as the number of ports, the number of positions and the fail safe positions. For example of 2/2 way normally closed solenoid valve will be 2 ports (inlet and outlet) with 2 positions (open or closed) with fail-safe position closed i.e. shut preventing flow of media without electrical supply, a 3/2 way normally closed solenoid valve will have 3 ports and 2 positions with fail safe inlet port closed, 5/2 way 5 ports 2 positions or 5/3 way 5 ports 3 positions.