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Senior Valve Type Orifice Plate Flowmeter

2021-04-07 16:48:42 85


The valve-type orifice plate flowmeter produced by our company is a professional products with high quality. Flange pressure is generally adopted unless otherwise noted, for which senior, junior and simple types are available. All products feature reliable installation precision of orifice plate and accurate measurement. After calibration on-line, the instrument system can reach Class A (Class 1.0) specified in Table A1 of GB/T18603-2001 for the accuracy. If without any calibration, the system accuracy can get to Class 1.5 if the secondary instruments are properly installed with the optimized accuracy obtained. It is easy for operation, and replacement of orifice plate can be made conveniently without intervening doing anything on pipelines. For the senior orifice pressure device, the orifice plate can be inspected and replaced within 3 to 5 minutes without stopping medium transmission. Its reasonable structure, reliable seal, safety and economy make it an ideal accessory product for flow measuring instrument.

The pressure device and orifice plate are designed, produced and inspected as per JB/T 7252-94 “Valve-type Orifice Plate Throttle Device” and conform to the requirements stipulated in GB/T2624-2006 and GB/T 21446-2008.


1. Typical application: metering of natural gas and gas main pipelines, or gas distribution station with large flow.

2. Suitable medium: purified natural gas, sour natural gas, air and cleaning oil.

3. Medium temperature: -29℃~121℃

4. Pressure Class: PN1.6~16MPa (class150~900) (to be customized when over 16MPa/class900)

5. Size: DN50~DN600mm (to be customized when above 700mm.


1.Orifice plate can be replaced on line without affecting medium transmission. No additional pipeline  needed and small space required offers it a good cost performance.

2.It is recommended that the device be installed vertically and the pipeline concerned horizontally.

3.The diameter of pressure tapping is Φ8. The distance between the axis of pressure tapping and the face of adjacent orifice is 25.4mm (same for the below).

4.It is characterized by compact structure, less weight, smooth transmission, reliable sealing and accurate measurement.

5.The manufacturer can supply complete set of device shown, the size of the openings decided by the customer.


● MAIN STANDARDS                                                                      

AGA3/AGA8 Orifice Metering of Natural Gas/ Compressibility Factors of Natural Gas and other Related Hydrocarbon Gases

GB/T2624   Measurement of Fluid Flow by Means of Orifice Plates, Nozzles and Venturi Tubes Inserted in Circular Cross-section Conduits Running Full.        

GB/T21446  Metering the Flow Rate of Natural Gas With Standard Orifice Plate.

JB/T7252     Valve Type Orifice Plate Pressure Device.

JJG640        Pressure Differential flowmeter (Regulations governing metrological verification of the People’s Republic of China).

JB/T82         Steel Pipe Welding Neck Flanges with Male and Female Face (Male and Female Face as well when for low pressure).  

GB/T5464    General-purpose Specification for the Packaging of Instrumentation Products.

GB/T8603   Technical Requirements of Measuring Systems for Natural Gas

● MATERIAL OF MAIN PARTS                                                          

Name of Parts

Non-Sulphur resistant

Sulphur resistant

Body, Bonnet

WCB Casting steel

Orifice Plate

Austenitic Stainless Steel

Sealing Plate

Rubber 5080

Fluorine rubber F370

Valve Plate



Mating Flanges

20 (unless otherwise specified in contract)

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Chengdu Holy Valve & Complete Equipment Co.,Ltd.

Add:No. 10, Gaopeng Avenue, High-tech District, Chengdu City, Sichuan, China
Post Code:610041