![]() Why does the pressure decrease? Where does the fluid go if the pathway is constricted? When fluid starts to flow, its velocity around the orifice in the pipe increases significantly because of the restriction in the cross-section. This principle is counter intuitive to common sense. Ĭonstricting a pipe where fluid flows through results in lower pressure. The static pressure in the first measuring tube (1) is higher than at the second (2), and the fluid speed at “1” is lower than at “2”, because the cross-sectional area at “1” is greater than at “2”. Compressed air runs through the initial chamber, then a smaller portal that opens into another larger chamber, which is like the first one. A Venturi vacuum is created by a pump with compressed air running through it, yet the pump has no moving parts. In 1797, Giovanni Battista Venturi performed experiments on flow in a cone-shaped tube and built the first flowmeter for closed pipes called the “Venturi tube”. Vortex Tube And Industrial Spot CoolingĪ Venturi System reduces pressure when a fluid flows through a constricted section (or choke) of a pipe.This actually makes a domestic ASME container into more of a distribution supply source. The hose and hose-end fittings allow propane liquid to be transferred into smaller tanks and cylinders for use on forklifts, gas grills or other appliances utilizing propane cylinders as an energy source. The valve attached to the liquid withdrawal valve is used as a service valve in this capacity. They are also used in consumer applications as a means for refueling portable cylinders. Used primarily by propane companies, the liquid withdrawal valve allows the tanks to be emptied of liquid propane before they are transported or moved. If the flow of liquid reaches a rate in excess of its design, the valve will close, hence the name "excess flow valve". The liquid withdrawal valve has a safety mechanism built in called an excess flow valve. Once the liquid withdrawal valve has been successfully opened by attaching the second valve to the exterior portion of the liquid withdrawal connection, propane liquid can be withdrawn. This secondary valve is available only through a licensed propane company. The seat disc (left) is opened by attaching a second valve to the exterior of the liquid withdrawal valve outside the tank. The valve itself is consists of a powerful spring holding a seat disc in a firmly closed position. The liquid withdrawal valve is attached to the tank and itself is in the vapor space.The diptube that reaches the bottom of the tank is in direct communication with the liquid space of the propane tank which allows it to be used for liquid propane service or liquid withdrawal. Without these required fittings, the liquid withdrawal valve is unusable. ![]() The liquid withdrawal valve functions only with additional specialized fittings supplied by a propane company for liquid evacuation. Propane Liquid Withdrawal Valve Operation Contact your propane company concerning the operation of the propane tank liquid withdrawal valve. It also is used in other applications requiring the use of liquid propane.ĭo not attempt to extract liquid from a propane tank through this valve. However, the proper name is "actuated liquid withdrawal excess flow valve" and it serves a vital role in propane tank liquid evacuation. The liquid withdrawal valve is often known by its manufacturers given name such as Chek-Lok or Checkmate. ![]()
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