Energy Saving High Accuracy Flow Meter Venturi Tube Flow Meter

• Customization: Available
• Accuracy: ±0.6-1%
• Main Application: Water, Wastewater, Diesel Fuel, Fuel Oil
• Size: DN25-1000
• Sensor: Plug-in
• Application: Energy Metering
• Type: Variable Area Flow Meter
• Measuring Media: Liquid
• Measuring Principle: Mechanics
• Measurement Object: Closed Pipeline
• Certification: JIS, DIN, ANS, GB, CE, RoHS, ISO
• Material: Carbon Steel or Stainless
• Transport Package: Wooden Case
• Specification: customized
• Trademark: dd
• Origin: Dalian

Product Description

LG Series Orifice Flow Measurement Throttle Device

Summary

Throttle device is the most historic and most extensively used flow measurement instrument. Its features are simple structure, easy installation, stable performance and high accuracy, etc merits. It can be used for flow measurement for liquid, steam and gas in modern industries. There are many kinds of throttle devices with a whole variety (being conformability with Standard GB/T2624-2006, Standard ISO5167-1-20031, Standard BS1042-1989 and Standard ASME) that are manufactured with advanced calculation methods and precise manufacturing means. They are applied extensively in petroleum, chemical, power, light industry, water supply field, gas transmission field etc.

LG Series Orifice Flow Measurement Throttle Device

Model composition and meaning

LG                ---                
                                                                           
                                                                           
                                            Pipe straight section code. See table 5
                                  Nominal pressure code. See table 4
                            Nominal diameter code. See table 3
                 Pressure measuring style code. See table 2
                                                                           
      Throttling element code. See table 1
                                                                         
Series number

Table 1 Throttling element code and meaning

Code	Meaning	Code	Meaning
Y	Standard orifice plate	I	Eccentric orifice plate
Q	1/4 circle orifice plate	S	Segmental orifice plate
X	Small caliber orifice plate	Z	Raw cast contracted section (throat) Classic Venturi Tube
T	Taper inlet orifice plate	J	Machined contracted section (throat) Classic Venturi Tube
M	ISA1932 ejection nozzle	H	Iron plate welded contracted section (throat) Classic Venturi Tube
C	Major diameter ejection nozzle	W	Venturi ejection nozzle

Table 2 Pressure measuring code and meaning

Code	F	H	Z	D	T
Meaning	Pressure measuring with flange	Pressure measuring with angle joint ring chamber	Pressure measuring with drilling hole	Pressure measuring with two distanced holes	Special pressure measuring

Table 3 Nominal diameter code and meaning

Code			01		016		02		026		03		04		05		06		08		10
DN		mm	10		15		20		25		32		40		50		65		80		100
		in			1/2		3/4		1		1-1/4		1-1/2		2		2-1/2		3		4
Code			12		15		20		25		30		35		40		45		50		60
DN	mm		125		150		200		250		300		350		400		450		500		600
	in		5		6		8		10		12		14		16		18		20		24
Code				70		80		90		91

LG Series Orifice Flow Measurement Throttle Device

 

1.0MPa	Nominal diameter DN	D	LA	LB	LC
	10	90	126	276	422
	15	95	126	351	497
	20	105	128	428	586
	25	115	132	507	673
	32	135	132	612	786
	40	145	138	738	924
	50	160	139	889	1075
	65	180	141	1116	1314
	80	195	146	1346	1552
	100	215	146	1646	1860
	125	245	159	2034	2280
	150	280	159	2409	2655
	200	335	163	3163	3417
	For the above table, the length of the front straight section should be 10 times as long as the nominal diameter, the length of the rear straight section should be 5 times as long as the nominal diameter; For the below table, the length of the front straight section should be 2000mm, the length of the rear straight section should be 1000mm.
	250	390	166	3166	3432
	300	440	162	3162	3428
	350	500	164	3164	3430
	400	565	164	3164	3430
	450	615	176	3176	3462
	500	670	190	3190	3508
	600	780	212	3212	3578
	700	895	210	3210	3576
	800	1010	238	3238	3668
	900	1110	242	3242	3680
	1000	1220	242	3242	3680

LG Series Orifice Flow Measurement Throttle Device

Order requirements

1. When purchasing throttle device, please fill in the specification table of throttle device (see below)

					Throttle Device Parameters Table				Project NO.
									Table NO.
									Page.     Total.
Data							Calculation
Operation conditions	Fluid name						Throttle element type
	Operating temperature ºC						Pressure taking type
	Operating pressure  MPa						Select scale
	Flow	Liquid       kg/h		Max.			Select differential pressure  kPa
		Steam       kg/h		Nor.			Min. flow limit
		Gas(standard)    Nm^3/h		Min.			Reynolds number          Re (normal flow)
		Liquid           kg/m^3					Area expansion correction coefficient                   Fa
		Steam           kg/m^3					Expansion coefficient           ε
		Gas (standard)    kg/m^3					Flow coefficient               α
							Uncertainty                  %
							Permanent pressure loss        Pa
							Diameter ratio                βt
							Hole diameter of throttle      mm element or segmental height
							1/4 circle radius or eccentricity degree            mm
	Operating density          kg/m^3						Throttle device standard
	Dynamic viscosity         mPa.s
	Kinematic viscosity        mm^2/s						Specification
	Relative humidity (Φ)
	Compression coefficient (Z)						Model
	Isentropic exponent  (cp/cv)						Normal diameter (DN)
	Allowable pressure loss        Pa						Normal pressure (PN)           MPa
Pipe	Nominal diameter (DN)						Flange standard
	Pipe instrument number						Flange inner diameter         mm
	Outside diameter/inner diameter  mm						Structural length              mm
	Material						Pressure tape size             mm
							Pressure tape location
							material	Throttle element
								Flange
								Bolt
								Nut
								Gasket
Remark