Wenzhou Jieda Petrochemical Instrument Co., Ltd.

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Zhejiang province Wenzhou City Economic Development Zone Ouhai three West Road No. 2

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Home > Product > Venturi tube and Venturi nozzle throttling device

Summary

When the fluid flows through the throttling device, the flowing speed will form local contraction at the throttling parts, which causes the speed high and the static pressure low； Then there would appear static pressure difference (or differential pressure). The higher the speed is, the heavier the pressure. Therefore, to measure the differential pressure can know the flow through the throttling device. This is based on the theory of the law of the conservation of energy and flow continuity equation.

Throttling element code

Code	Name	Code	Name	Code	Name
O	Standard orifice plate	E	Eccentric orifice plate	P	Standard nozzle
S	Double orifice plate	V	Conical entrance orifice plate	C	Long diameter nozzle
Q	Segmental orifice plate	T	Lens plate	L	Venturi nozzle
X	Orifice plate	R	1/4 hole plate	W	Venturi pipe

Pressure form code

H:	Annular chamber
Z:	Flange hole
K:	wide margin

Straight sections of code

With upstream and downstream pipe

PF:

With upstream and downstream pipe The next with a connecting flange and process connection flange

PF1:

With upstream and downstream pipe The next with a connecting flange

Model example
Example 1
FCOHPF-63X100 means nominal pressure is 6.3MPa, nominal diameter is 100mm, with upstream and downstream pipe and the connecting flange, and ring chamber press the standard orifice plate throttling device
Example 2
FFOP-300#×50 means nominal pressure is 300lb, nominal diameter is 50mm, with upstream and downstream pipe and flange press the standard orifice plate throttling device.

Scope of application

Principle

Nominal pipe size: Venturi tube DN80-1600mm;

Nominal pressure: PN0.6, 1.0MPa;

Material: If there are no particular requirements, the orifice plate uses 1Cr18Ni9Ti, flange and pipe section made with steel No.20, or with other materials according to the requirements of the clients.

Structure form is as the pictures 41,42,43,44, install size as table 36:

Nominal pipe size: Venturi tube D_N 80～500mm

Nominal pressure:PN16.0, 25.0, 42.0MPa；

Table 36 Install size of P_N0.6MPa venturi tube (FTWP, FTWPF) and P_N1.0 venturi nozzle (FTLH)

Code	FTWP-0.6 x D_N					FTWPF-0.6 x D_N					FTLH-1.0 x D_N
D_N	D	L	L1	L2	Weight(kg)	D	L	L1	L2	Weight(kg)	D	L	L1	L2	Weight(kg)
65											180	1396	1000	260	43.2
80											195	1401	1000	260	47.5
100											215	1410	1000	260	63.5
125											245	1422	1000	260	82.6
150											280	1469	1000	300	104.9
175											310	1637	1100	360	129.6
200						488	1175	544	581	105.3	335	1786	1200	400	154.8
250						538	1478	689	735	151.6	390	2111	1400	500	232.2
300	692	1712	642	884	135.2	590	1766	828	884	210.5	440	763	230	364	200.3
350	744	2000	751	1033	171.8	640	2058	967	1033	262.1	500	831	230	413	268.6
400	793	2271	852	1173	210.7	690	2333	1098	1173	335.9	565	922	230	482	357.2
450	847	2570	965	1327	258.7	742	2632	1243	1327	401.7	615	998	230	541	429.2
500	897	2847	1069	1470	308.3	792	2913	1377	1470	457.2	670	1072	230	600	523.6
600	997	3401	1277	1756	421.0	892	3467	1645	1756	633.4
700	1087	3900	1464	2014	538.2	992	3970	1886	2014	810.4
800	1187	4454	1672	2300	686.0	1094	4524	2154	2300	1079.1
900	1287	5008	1880	2586	894.7	1194	5082	2422	2586	1392.0
1000	1387	5561	2087	2892	1038.1	1294	5639	2690	2892	1514.0
1100	1487	6093	2287	3146	1553.3
1200	1587	6647	2495	3432	1701.7
1300	1687	7201	2703	3718	2136.0
1400	1787	7755	2911	4004	2462.2
1500	1887	8309	3119	4290	2811.9
1600	1987	8863	3327	4587	3485.0

Note: the installment size and gross weight are all computed under the assumption that the diameter ratio is β=0.6， and in practice application, the calculation should use the data of real process pipe and diameter ratio.

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