Orifice Plate Flow Meter

Orifice Plate Flow Meter

Orifice Plate Flow Meter is a high range specific differential pressure flow device, which is composed of a standard orifice plate and multi-parameter differential pressure transmitter. (or differential pressure, temperature and pressure transmitter) It has a simple structure, convenient maintenance, and stable performance.

NO.SI-Orifice Plate Flow Meter
PaymentT/T, Paypal
Product OriginShaanxi, China
Shipping PortShanghai/Ningbo/Shenzhen
Lead Time3-5 days after payment received
(1) Product name:Orifice flow meter
(2) Power Supply:85~265VAC 45~63HZ
(3) Chamber Material:Stainless steel, carbon steel
(4) Repeatability Accuracy:+/-0.1%
(5) Output current:4~20mADC
(6) Pipe Size:DN10~DN1200
(7) CertificateISO9001:2000
(8) Working pressure :≤ 42.0MPa
(9) Medium temperature-40°C- 450°C
(10) Connection type:Flange or wafer type

High Accuracy

Orifice plate flow sensor is actually a flow rectifier, can effectively eliminate swirl and distorted velocity distribution improvements, the ideal state of the flow field approximation, the conventional measure for level 0.5, high accuracy measurement for level 0.2.

Differential Throttling Parts

Throttling pieces have many forms: standard orifice plate, standard nozzle, long diameter nozzle, round missing orifice, quarter orifice, orifice, venturi and so on

Low Pressure loss

Orifice plate flow meter multi-hole symmetrical design reduces the formation of vortices and turbulence of friction, reducing the kinetic energy loss. In the same working condition without reducing the differential pressure, the balance flow meter can reduce 1/2~1/3 permanent pressure loss compared with the conventional throttle device to reduce the cost.

Good Repeatability and Long-term Stability

The orifice flow meter is with the stable flow to improved repeatability up 0.1%.

Balanced flow meter multiple circulation holes dispersed by force, no acute wear, its β value of long-term unchanged to maintain stability, the whole instrument with no moving parts, extend the service life of 5 to 10 times faster than conventional throttling device.

Wide Application Range

Working temperature and pressure of a balanced flow sensor are decided by pipe and flange material, it can reach 800 ℃, 42MPa or higher temperature, pressure medium. Suitable for cryogenic fluid LNG \ liquid air, liquid ammonia, liquid oxygen, liquid fluoride, liquefied ethylene, liquid hydrogen, chlorine, etc., can effectively prevent vaporization, measuring the good effect.

Natural Gas

The orifice plate (orifice meter) is a differential pressure meter frequently used in natural gas measurement. It measures volumetric flow, though can also calculate mass flow depending on the calculation associated with the device. It uses the same principle as used in a Venturi-style meter (Bernoulli’s principle), suggesting that there is a relationship between the velocity and pressure of the fluid. That relationship is – as the velocity increases the pressure decreases. With an orifice meter, the flow is determined through the difference in pressure between the upstream and the downstream side of a partly impeded pipe.

Steam Flow

Steam has often been described as the ‘lifeblood’ of industry. It is the medium by which heat from a boiler is converted into an easily transportable form that can provide diverse services from office heating to the mechanical energy that drives turbine generators. Steam is still one of the most popular methods of providing an energy source to a process and its associated operations.

The orifice flow meter is not suitable for low-flow measurement, and can develop zero drift and span drift when the temperature/pressure conditions fluctuate beyond the design specifications. In order to measure larger turn downs with an orifice, the plates must be changed periodically and the pressure transmitters re-calibrated and spanned.

  • metallurgy,
  • electric power,
  • coal,
  • chemical,
  • petroleum,
  • transportation,
  • construction,
  • textile,
  • food,
  • medicine,
  • agriculture,
  • water,
  • artificial gas,
  • natural gas,
  • steam and oil
  • environmental protection
What is a flow orifice?

An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate). Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. It uses the same principle as a Venturi nozzle, namely Bernoulli’s principle which states that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases, and vice versa.

How does an orifice plate flow meter work?

A single-phase fluid-filled with a pipe, when it flows through a throttle in the pipe, the flow will form a local contraction at the throttle, so that the flow rate increases and the static pressure decreases so that a static pressure difference is generated before and after the throttle. The greater the fluid flow rate, the greater the pressure differential produced, which indirectly measures the flow rate based on the measured differential pressure. This measurement method is based on the flow continuity equation (the law of conservation of mass) and the Bernoulli equation (the law of conservation of energy). The magnitude of the pressure difference is not only related to the flow rate but also to many other factors. For example, when the physical properties (density, viscosity) of the fluid in the form of the throttling device or the pipe are different, the pressure difference generated at the same flow rate is also different. Transit time ultrasonic flowmeters send and receive ultrasonic waves between transducers in both the upstream and downstream directions in the pipe. At no flow conditions, it takes the same time to travel upstream and downstream between the transducers. Under flowing conditions, the upstream wave will travel slower and take more time than the (faster) downstream wave. When the fluid moves faster, the difference between the upstream and downstream times increases. The transmitter processes upstream and downstream times to determine the flow rate. They represent about 12% of all flowmeters sold.

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Kim Guo
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