Solenoid Valve Terminology V - Z

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Solenoid Valve Terminology V

Vacuum : Vacuum is negative pressure or suction, typically measures as Torr or mmHG, Micron, psia, inches mercury gauge, inches mercury absolute and kPa. The maximum possible achievable vacuum is -1 bar or - 1 atmosphere such as outer space.

Valve : A valve is a mechanical device designed to control, prevent or restrict the flow of gas or liquid media along a pipeline.

Valve Body : The valve body is the main part of the solenoid valve in which the connecting ports, seals and seats are located

Valve Specifications : Valve specifications include valve type, size, materials of construction, minimum and maximum operating pressures and temperatures, function, connection type and minimum and maximum operating and working pressures. Some valve specifications and dictated by globally recognised standards such as:

  • ASTM A126-04 Standard Specification for Gray Iron Castings for Valves, Flanges and Pipe Fittings.
  • ASTM A182/A182M-04 Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings and Valves and Parts for High-Temperature Service.
  • ASTM A338 Standard Specification for Malleable Iron Flanges, Pipe Fittings and Valve Parts for Rail road, Marine and Other Heavy Duty Service at Temperatures Up to 650°F (345ºC).
  • ASTM A522/A522M-01 Standard Specification for Forged or Rolled 8 and 9% Nickel Alloy Steel Flanges, Fittings, Valves and Parts for Low Temperature Service
  • ASTM A694/A694M-03 Standard Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves and Parts for High Pressure Transmission Service.
  • ASTM A961-04 Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves and Parts for Piping Applications.
  • ASTM A988/A988M Standard Specification for Hot Isostatic-ally-Pressed Stainless Steel Flanges, Fittings, Valves and Parts for High Temperature Service.
  • ASTM A989/A989M Standard Specification for Hot Isostatic ally-Pressed Alloy Steel Flanges, Fittings, Valves and Parts for High Temperature Service.
  • ASTM B61-2 Standard Specification for Steam or Valve Bronze Castings
  • ASTM B763 Standard Specification for Copper Alloy Sand Castings for Valve Application.
  • ASTM B834 Standard Specification for Pressure Consolidated Powder Metallurgy Iron Nickel Chromium Molybdenum (UNS N08367) and Nickel Chromium Molybdenum Columbium (Nb) (UNS N06625) Alloy Pipe Flanges, Fittings, Valves and Parts
  • ASTM C1129 Standard Practice for Estimation of Heat Savings by Adding Thermal Insulation to Bare Valves and Flanges.
  • ASTM F885 Standard Specification for Envelope Dimensions for Bronze Globe Valves NPS 1/4 to 2.
  • ASTM F992 Standard Specification for Valve Label Plates.
  • ASTM F993 Standard Specification for Valve Locking Devices.
  • ASTM F1020 Standard Specification for Line-Blind Valves for Marine Applications.
  • ASTM F1030 Standard Practice for Selection of Valve Operators.
  • ASTM F1098 Standard Specification for Envelope Dimensions for Butterfly Valves NPS 2 to 24.
  • ASTM F1271 Standard Specification for Spill Valves for Use in Marine Tank Liquid Overpressure Protections Applications.
  • ASTM F1370 Standard Specification for Pressure-Reducing Valves for Water Systems Shipboard.
  • ASTM F1394 Standard Test Method for Determination of Particle Contribution from Gas Distribution System Valves.
  • ASTM F1565 Standard Specification for Pressure-Reducing Valves for Steam Service.
  • ASTM F1792 Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service.
  • ASTM F1793 Standard Specification for Automatic Shut-Off Valves (also Known as Excess Flow Valves, EFV) for Air Or Nitrogen Service.
  • ASTM F1794 Standard Specification for Hand Operated, Globe-Style Valves for Gas (Except Oxygen Gas) and Hydraulic Systems.
  • ASTM F1795 Standard Specification for Pressure Reducing Valves for Air or Nitrogen Systems.
  • ASTM F1802 Standard Test Method for Performance Testing of Excess Flow Valves.
  • ASTM F1970 Standard Specification for Special Engineered Fittings or Valves for use in Polyvinyl chloride (PVC) or Chlorinated PolyVinyl Chloride (CPVC) Systems.
  • ASTM F1985 Standard Specification for Pneumatic Operated, Globe-Style, Control Valves.
  • ASTM F2138 Standard Specification for Excess Flow Valves for Natural Gas Service.
  • ASTM F2215 Standard Specification for Balls, Bearings, Ferrous and Nonferrous for Use in Bearings, Valves and Bearing Applications.
  • ASTM F2324 Standard Test Method for Prerinse Spray Valves.

Velocity : Velocity is speed of an object, gas or liquid measured as distance over time. The velocity of a gas or liquid along a pipeline is commonly given as Ft/Sec or feet per second.

Vent Plug : A vent plug a threaded nipple or plug that is screwed into a pipeline or valve body, which when removed will allow the contents of the pipeline or valve cavity to vent out to atmosphere, so that the pipe or valve can be inspected or maintained.

Vertical Pattern : A vertical pattern valve is a valve whose ports (inlet and outlet) share a common axis (in line with each other) and are suited for mounting in a vertical position.

Viscosity : Viscosity of fluids can be measured in different ways, Say-bolt Universal Seconds, Engler degrees, Kinematic centistokes. See table below that show

Visual Position Indicator (VPI) : A visible mechanical indicator or arrow that shows the position of a valve, normally protected by a transparent plastic cover or shield.

Voltage : Voltage or volts is an electrical measurement or electromotive force, the difference of potential that would carry one ampere of current against one ohm resistance. Voltage (Volts) is a measure of force. Amperes typically a measure of electric current.

Volume : Volume is a capacity measurement usually measured in litres, gallons, pint or fluid ounces. Typically used to show how much fluid can pass through a valve over a given period.

  • 1 gallon (UK) = 4.54 litres
  • 1 gallon (USA) = 3.79 litres
  • 1 Pint (UK) = 0.57 litres
  • 1 Pint (USA) = 0.47 litres
  • 1 fluid once (UK) = 28.4 cm³
  • 1 fluid once (USA) = 29.6 cm³

Solenoid Valve Terminology W

Wall Thickness : The wall thickness of the material of a pressure bearing pipe, tube or pressure vessel. For example a pipe with an outside diameter (OD) of 25mm with a wall thickness of 2.5mm will have an internal diameter of 20mm. (25mm - 2x 2.5mm of pipe thickness each side).

Water : Water (H₂O) is typically a clear, transparent odourless liquid with density or specific gravity of 1, turns into a solid (ice) at 0°C or steam at 100°C at atmospheric pressure. water forms the sea, lakes, rivers and rain and is the foundation of life on earth. Water is the most common fluid controlled in process systems and there is a wide range of valves designed to control water. Water is available in many forms, such as sea water, clean process water and even pure or de-mineralised water. We drink water, wash with water, process food and drinks with water, even cool, wash and flush process systems with water.

Water Hammer : The audible effects of pressure waves generated by rapid changes in fluid velocity or speed