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Product details
1、 Overview
Orifice plate, V-cone, nozzle, Venturi, Delta bar, Velbar and other flow meters are typical differential pressure flow meters. Their working principles are the same, but the way of taking differential pressure is different (i.e. the throttle element is different). They have the same flow formula (see formula one), and the basic configuration of the flow meter is also the same. A typical differential pressure flowmeter consists of throttling elements (orifice plate, V-cone, nozzle, etc.), differential pressure transmitter, three valve group, pressure transmitter, Pt-100 platinum resistance thermometer, intelligent flow integrator, etc.
Differential pressure flow meters are mainly used in high temperature and high pressure or non high temperature and high pressure but with a diameter greater than DN300. They can measure media such as steam, gas, and liquid, and their specific application ranges vary. Orifice flowmeter is the most classic differential pressure flowmeter, which has been widely used due to standardized production; However, due to its high pressure loss, narrow range, easy wear, and many alternative instruments, its selection has been limited. The V-cone flowmeter has low pressure loss and wide range, making it an ideal substitute for orifice flowmeters. The nozzle flowmeter is not easily worn out and is particularly suitable for measuring steam under high temperature and high pressure conditions such as boiler outlets. Other differential pressure flow meters such as Venturi, Delta, and Velbar are also selected under different operating conditions, and each has its own advantages and disadvantages. Please contact the manufacturer by phone, mail or email for detailed instructions on various differential pressure flow meters. Usually, when the diameter is below DN300 (including DN300) and the temperature is below 350 ℃, a vortex flowmeter can be used. It has many advantages, which are detailed in the vortex flowmeter section and flow knowledge on this website.
2、 Working principle and structure
1. Working principle
2. Schematic diagram of typical ring chamber pressure tapping and throttling device
3、 Ordering Notice
1 When ordering a differential pressure flowmeter, a consultation form should be filled out by the user. The consultation form should be filled out accurately item by item, and after review, it cannot be altered arbitrarily.
2 The data must be filled in correctly and uniformly. If the data units are inconsistent, please fill in clearly for conversion.
3 The measuring medium is water and water vapor, and the density and viscosity may not be filled in, but the density and viscosity of oils and solvents should be filled in.
4 When measuring the medium as a gas, the flow rate, gas composition, density, viscosity, and relative humidity must be clearly filled in. The density and viscosity of general gases may not be filled in, but the density and viscosity of rare gases must be filled in.
5 Differential pressure should generally be designed by the manufacturer and does not need to be filled in; But if the form has already been ordered, it can be filled in as a reference. If it is unreasonable, please contact the buyer again.
6 Users should fill in data carefully and be responsible for the data; The manufacturer designs based on the data filled in by the user and is responsible for the design data.
4、 Consultation Letter for Ordering Throttle Devices
1. Tested medium_____________
2. Maximum flow rate _________ t/h, kg/h, m ³/h, Nm ³/h, maximum differential pressure _________ KPa
3. Common flow rate: _________ t/h, Kg/h, m ³/h, Nm ³/h Common differential pressure: _________ KPa
4. Minimum flow rate _________ t/h, Kg/h, m ³/h, Nm ³/h Minimum differential pressure _________ KPa
5. Maximum pressure _________ MPa, maximum temperature _________ ℃
6. Common pressure _________ MPa Common temperature _________ ℃
7. Minimum pressure _________ MPa Minimum temperature _________ ℃
8. Local average atmospheric pressure ________ KPa, allowable pressure loss ________ KPa
9. Medium density __________ kg/m ³ Working condition Medium viscosity_____________
10. At 20 ℃, the actual inner diameter of the pipeline is __________ mm, and the outer diameter is multiplied by the wall thickness of __________ mm
11. The length of the existing straight pipe section at the throttling element of the pipeline material is ___________ mm
12. Installation method (1) Horizontal __________ (2) Vertical up __________ (3) Vertical down__________
13. Is it equipped with pressure compensation, temperature compensation, or flow accumulator
14. Accumulator signal output
15. Contact person: [insert phone number] [insert phone number] [insert fax number]______________
16. Unit Name__________________________
5、 Differential pressure flowmeter type spectrum
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