Differential pressure flowmeter

VH Series
OUTLINE
Wafer-Cone® Differential pressure flowmeter with wafer type connections among V-cone flowmeters is designed and fabricated by TOKYO KEISO CO., LTD under the license of McCROMETER, Inc. U.S.A.
Its newly born body is made of the precision casting using lost wax
process. The simple and rigid construction taking advantages of VCone flowmeter realized the low cost.

FEATURES

MEASUREMENT PRINCIPLE● Simple installation

The principle of Wafer-Cone flowmeter is the same as that of a com-

Wafer connection makes installation simple. Flowmeter body flanges

mon differential pressure type flowmeter, and it is based on the Ber-

designed to match the pipe flanges guides to the pipe center line.

noulli’s theorem of the conservation of a fluid energy.
As shown in Fig.1, the pressure P1 at the approaching point to V-Cone● Wide application

decreases to P2 at the edge point with increasing fluid velocity by

Wafer-Cone flow meter can measure almost all process fluids, i.e.

throttling the flow path along the contoured shape of Wafer-Cone.

liquids, gases and steam.

P1 and P2 are measured from the pressure taps and the difference ofthe two pressures is given as:● Short straight runs
The required straight runs are less than 1/5 of those required for¨P=P1–P2¨P is differential pressure output.

orifice and vortex flowmeters. The narrow installation space allows

Energy loss

simple and flexible piping arrangement plan. It leads to space andcost saving.
● Stable differential pressure output

P1

Velocity energy

Total energyof a fluid
Pressure energy

Stable measurement is assured if the differential pressure across theP2

meter is more than 0.025 kPa.
● Wide rangeability¨P

Since the differential pressure created by the meter is stable at low
flow rate, it can measure the flow rate in the range of the turn down
ratio 10:1 with the standard maximum differential pressure.
● Low pressure loss
Small differential pressure allows low pressure loss with less throt-P2

P1
FLOWtling.
CONE● High reliability
V shape cone has durable structure against wear or adhesion. Moreover, it is maintenance-free because of structure without a movingpart. For a long period, reliable flow measurement is assured.
[Fig. 1]

TG-F1017-2E
RevisedMay 2016 K
2nd edition Jun 2008 K

VH series Wafer-Cone® Differential pressure flowmeter

STANDARD SPECIFICAION● Meter size

25, 40, 50, 65, 80, 100 mm
1, 1-1/2, 2, 2-1/2, 3, 4 inch

● Required straight runs
[Measuring fluid : Liquids general, Gases*1 and Steam*1*1 Reynolds No. < 200,000]● Connection

Wafer type

● Rating

JIS10K, 20K

Type of joints

Upstream side

Downstream side

ANSI Class150, 300

1 piece of 90° bend

0D0D

DIN PN16, 40

2 pieces of 90° bend

0D0D

T joint

0D

0D

Butterfly valve(Flow control valve)

3D

3D

Butterfly valve (Fully open)

3D

0D

According to pressure andGate valve (Fully open)

0D

0D

temperature rating of flanges

Expander(Diameter 0.67D expands
to 1D, length 2.5D)

1D

1DReducer(Diameter 3D reduces
to 1D, length 3.5D)

1D

1D

GB PN1.6, 4.0● Connection size

Same as meter size

● Materials

SCS14A (Body)
SUS316 (Cone)● Measuring fluids● Fluid pressure/temperature

Liquids, Gases, Steam● Uncertainty of discharge coefficient ±1.0% (Standard)Turn down ratio

10:1 (Standard)

Reynolds No.

≧ 8000Differential pressure≧ 0.025 kPa● V-Cone β ratio

8 types are available.
0.45, 0.50, 0.55, 0.60
0.65, 0.70, 0.75, 0.80

● Differential pressure tappings

Taper pipe threads,

Type of joints

Rc1/4 or Rc1/8,
NPT1/4 or NPT1/8● Flow direcion[Measuring fluid : Gases and Steam Reynolds No. >200,000]

Horizontal or vertical

Upstream side

Downstream side

1 piece of 90° bend

1D1D

2 pieces of 90° bend

1D

1D

T joint

1D

1D

Butterfly valve(Flow control valve)

10D

5D

Butterfly valve (Fully open)

5D

3D

Gate valve (Fully open)

1D

1D

Expander(Diameter 0.67D expands
to 1D, length 2.5D)

2D

2D

Reducer(Diameter 3D reduces
to 1D, length 3.5D)

1D

1D[Notes]· D shows the nominal size of Wafer-Cone flowmeter.
· The required straight runs are the distance from the flange facesof Wafer-Cone flowmeter.
· Add 1D to the above mentioned figures for the service β ratio is0.65 or more.

SIZING
Based on a selected Wafer-Cone β ratio, the differential pressure
at maximum flow range is determined by the meter size and fluidproperties. The maximum differential pressure corresponds to themaximum flow range of indicator. The maximum differential pressure can be selected as required by designating a Wafer-Cone βratio and a flow range if meter size and fluid properties are given.
The Wafer-Cone® sizing program presents a solution to meet yourrequirements such as low pressure loss measurement or more precise flow measurement.
Please contact TOKYO KEISO for further information of the WaferCone® sizing program.

2TOKYO KEISO CO., LTD.

TG-F1017-2E

VH series Wafer-Cone® Differential pressure flowmeter

MODEL CODESMODEL CODESVH□Materials

1□□□

–□□–□

CONTENTS□SCS14A/SUS316

325A

1"

DN25

440A

1-1/2"

DN40

Meter size

550A

2"

DN50/Connection size

665A

2-1/2"

DN65

780A

3"

DN80

8100A

4"

DN100

Connection rating

J1

JIS10K

J2

JIS20K

A2

ANSI Class 150

A5ANSI Class 300

G1GB PN1.6

G4GB PN4.0

D1

DIN PN16

D4DIN PN40

V-Cone β ratio

– 45

0.45

– 50

0.50

– 55

0.55

– 60

0.60

– 65

0.65

–70

0.70

– 75

0.75

– 80

0.80

Screws of pressure taps

–1Rc–2NPT
1Type 1 (Standard)

2Type 2Differential pressure tap location

3Type 3(See tap location below)

4Type 45Type 5

6Type 6

Differential pressure tap location type
Type
1

AB

2

AC

3

D

C

4

D

B

5E

B

6E

C

TG-F1017-2EEEHigh pressure Low pressuretaptapFLOWAFLOWBCDTOKYO KEISO CO., LTD.

3

VH series Wafer-Cone® Differential pressure flowmeter

Low pressure tap
Following size of stud bolts are recommended.
JISConnection rating
Meter size

ANSI

DIN

GB

10K(mm)20K(mm)Class150(inch)

Class300(inch)

PN16(mm)

PN40(mm)

PN1.6(mm)PN4.0(mm)

25A

1"

DN25

M16×130

M16×140

1/2×5

5/8×5-1/4

M12×130

M12×130

M12×130

M12×13040A

1-1/2"

DN40

M16×160

M16×160

1/2×6

3/4×6-3/4

M16×160

M16×160

M16×160

M16×160

50A

2"

DN50

M16×170

M16×170

1/2×6-1/2

5/8×6-3/4

M16×170

M16×170

M16×170

M16×170

65A

2-1/2"

DN65

M16×190

M16×190

5/8×7-1/2

3/4×8

M16×190

M16×190

M16×190

M16×190

80A

3"

DN80

M16×210

M20×220

5/8×8-1/4

3/4×9

M16×210

M16×220

M16×210

M16×220

100A

4"

DN100

M16×240

M20×260

5/8×9-1/2 3/4×10-1/2 M16×240

M20×260

M16×240

M20×260

DIMENSIONS
B

②C2-E

①

● Materials
Part name

Materials

1

Body

SCS14A2

Cone

SUS3163

Support

SUS316

4

Fastening bolts SUS316L

Part No.

③∅dFLOW④L● Dimension list
Meter size
(mm)

L(mm)

\d(mm)

B(mm)C(mm)E(Rc or NPT)

Weight(kg)

2557

24.31

12.7

31.8

1/8

1.0

4076

38.1

16.5

43.2

1/8

2.0

50

86

49.25

19.0

47.8

1/4

2.5

65

102

59.0

19.0

63.5

1/4

4.5

80

121

73.66

25.4

69.9

1/4

6.5

100

152

97.18

31.8

88.9

1/4

12

Wafer-Cone® is registered trademarks of McCROMETER, Inc.

* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : http://www.tokyokeiso.co.jp
4TG-F1017-2E