4-20mA Orifice Water Flow Meter With Indicator 85~265VAC 45~63HZ

LG throttling gear is a primary device in a differential pressure flow measurement system, which consists of a throttle, a pressure-receiving device and a straight pipe section. Throttling device is divided into standard throttling device and non-standard throttling device, the one is coincident with IS05167 and GB/T2624 standard is the standard throttling device, the others are non-standard throttling deivce.
When the pipe filled fluid flows through the throttling device in the pipe, according to the law of conservation of energy and the equation of flow continuity, the stream will form a local contraction at the throttle, thereby increasing the flow rate, static pressure reduction, static pressure difference ΔP(or named differential pressure) before and after the throttle. The greater the flow rate of the fluid, the greater the differential pressure generated before and after the throttle, and the amount of fluid flow is measured by measuring the differential pressure before and after the throttle.
Standard throttling devices should normally be used whenever possible, and non-standard throttling devices can be used only when the fluid Reynolds number is small or contains impurities.

Technical Parameters
Nominal diameter:DN15~1200(More than 1200 negotiated orders)
Nominal pressure:≤42MPa
Inaccuracy:±0.5%~±1.5%
Installation method:Flange connection, Welded connection(or customized)
Pressure method: Corner connection pressure (ring chamber or separate drilling), Flange pressure, Span pressure or else
Straight pipe: Upstream5~10D,downstream2~5D

Throttling device classification

classification	Pressure method		Reference model	Nominal diameter(mm)	Nominal pressure(MPa)	Diameter ratio
Orifice plate	Small orifice plate	Corner connection pressure	LG-XH-40/25	15~40	1.0~42	0.1~0.7
		Flange pressure	LG-XF-40/25	25~40	1.0~42	0.15~0.7
	Standard orifice	Corner connection pressure	LG-BH-320/100	50~400	1.0~42	0.23~0.8
			LG-BH-100/65	50~250	1.0~42
			LG-BH-63/50	15~150	1.0~42
			LG-BZ-16/600	450~1600	0.6~2.5
			LG-BZ-10/50	450~1000	0.6~1.6
		Flange pressure	LG-BF-25/300	50~750	1.0~20	0.25~0.75
			LG-BZ-40/150	50~400	1.0~20
		Span pressure	LG-BJ-63/150	50~400	1.0~63
	Built-in orifice		LG-BFC-260/80	50~400	1.0~42
	Double orifice		LG-SH-16/100	25~400	1.0~10	0.19~0.82
	1/4 round orifice		LG-HH-160/100	25~400	1.0~26	0.32~0.71
	Conical inlet orifice plate		LG-VH-16/100	25~200	1.0~4.0	0.12~0.32
	Round hole plate		LG-QH-6/1000	50~1600	0.25~2.5	0.32~0.71
			LG-QH-25/600	50~1400	0.25~2.5
Nozzle	Small nozzle		LG-MH-40/32	25~40	1.0~26	0.3~0.71
	Standard nozzle		LG-PH-40/150	50~600	1.0~32	0.30~0.8
			LG-PH-63/200	50~600	1.0~32
	Long neck nozzle		LG-CJ-260/80	50~400	1.0~32	0.22~0.8
Venturi tube	Venturi nozzle		LG-LT-16/150	65~400	0.6~2.5	0.32~0.78
	Classical venturi	Machining	LG-WT-6/200	50~600	0.6~40	0.38~0.75
		Rough welding	LG-WT-6/1200	200~2000	0.6~2.5	0.38~0.73

 

Small orifice plate, Small nozzle Reference size table

Pressure Level	Size	DN15	DN25	DN32	DN40
PN25	D	95	115	135	145
	L	126	128	143	149
PN40	D	95	115	135	148
	L	126	147	148	148
PN63	D	105	135	150	165
	L	126	152	159	177
PN100	D	95	135	150	165
	L	126	155	162	178

Note: The length L is based on the actual size, and the dimensions in the table are for reference only.

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