DATA SHEET ®BTG Pulp & Paper Sensors AB D2024/2en PDF

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Summary

DATA SHEET Pulptec™ VBW-1000 Basis Weight Valve ! High resolution - accurate flow control. ! Alt. A: Large capacity ball segment type valve with virtually linear characteristic for optimal control. ! Actuator and valve combined are virtually free from stiction and backlash to obtain highest repeatab...

Description

DATA SHEET

Pulptec™

VBW-1000

Basis Weight Valve

!

High resolution - accurate flow control.

!

Actuator and valve combined are virtually free from stiction and backlash to obtain highest repeatability.

!

!

Alt. A: Large capacity ball segment type valve with virtually linear characteristic for optimal control. Alt. B: Well proven, reliable ball sector type valve with a more equal flow characteristics integrated with the actuator provides a unique compact, sturdy design which directly can replace older BTG/Eur-Control valves type VBW/VBW-10.

Compact, sturdy and simple design for highest durability.

The BTG Basis Weight Valve is designed for precision control of the pulp flow to the paper machine. It is distinguished by its extremely high accuracy and resolution in process conditions. The virtually linear characteristic of the alt. A valve makes it ideal for precision control while alt. B valve is an option if a more equal flow characteristic is preferred. The design has proven to be extremely reliable in numerous installations worldwide.

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Basis weight valve VBW-1000



Design

.6 +4+ +6

Fig 1 CRC CT FT 1 2 3 4 5 6 7 8 9 10 11

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The actual control valve is either a ball segment type valve alt A, made by SOMAS, that is ideal for accurate flow control over the whole valve stroke, or a traditional ball sector type valve - alt. B, made by MKE under license from BTG. Due to its linear characteristics the alt. A valve type provides considerably higher flow capacity compared to valves of the same size of different design. Both valve types are as standard made for mounting between flanges (wafer design) for valve size up to 250 mm (10"). For the largest (300/350mm) valve sizes the valve is always flanged and made by Somas. The valve design for both models are based on a well-known standard design but adapted for the basis weight valve application. The ball segment/sector and spindle are hard-chromed for minimum friction and virtually maintenance-free operation. For the Somas type valves (alt. A), the ball segment can easily be replaced individually (for valve size > 80 mm) to provide a very low repair cost. The seat ring of carbon-filled PTFE provides a long lifetime and is very easy to replace. The stuffing box is designed for a virtually maintenance-free and low friction operation.

!

Typical basis weight control including consistency and flow Consistency Controller/Recorder Consistency Transmitter type MEK Flow Meter BTG Basis Weight Valve VBW-1000 Machine chest White water chest Consistency signal Flow signal Control signal to the basis weight valve Valve position signal 4 - 20 mA QCS (Quality Control System) / Basis weight control system Actual basis weight (from scanner) Basis weight set point Final consistency control

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The Somas valve (alt. A) can, on request, be supplied in other variants such as: flanged also for small sizes, stellite coated or hard-chromed body in different variants for abrasive service or in equal-flow (V-port) model etc. D2024/2en

P.1

This conversion makes it less sensitive to disturbances. This signal is not intended to be used as a feedback signal in the control circuit, only as an indication of the valve position.

An electric actuator, identical for both valve models, driven by a synchronous motor controls the valve. The motor is connected to the valve spindle via a special highly accurate gearbox type Harmonic Drive

The valve can be directly controlled by a controller/computer making potential-free closing contacts, or open collector with pulse duration output. Via a separate relay box - not provided by BTG - a SCR (thyristor-pulsed output) can be connected.

The standard actuating time is 260 s at 50 Hz and 217 s at 60 Hz which is fully sufficient for virtually all applications. The valve and actuator are tied together using special arrangements to provide a transmission virtually free from backlash (play) and stiction (valve friction). The valve accuracy is measured using an actual complete valve and remains during a very long time in operation.

As option the actuator can be supplied with double feedback potentiometers for redundancy service. Another option is a small sized remote control unit - VBW-10RC which is combined with the ordinary electronics unit. The unit is suitable to install in the control panel to obtain possibility to manoeuvre the valve from two separate locations.

An electronics unit controls the valve. A digital instrument shows the valve position in %. The signal comes from a precision potentiometer in the valve. Before being sent to the electronics unit, this signal is transformed into a 4 - 20 mA current signal by an R/I-transducer located in the actuator. Fig 2 1 2 3 4 5 6 7 8 9

Cut-away of BTG Basis weight valve VBW-1000



!

Ballsegment valve Precision potentiometer for valve position signal 4 – 20 mA Actuator Electric synchronous motor with planetary gear Spindle coupling Gear box, type Harmonic drive R/I converter Travel limit switches Hand-operation wheel

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Technical Data General Manufacturer BTG, Säffle, Sweden Quality Assurance ISO 9000:2000 Product Safety Fulfills all relevant CE requirements and all Australian requirements.

Function Specifications Actuator Data Control Function Time-duration pulsed input.

P.2

Motor Type High-precision synchronous single-phase AC motor with built-in planetary gear box. Transmission Harmonic drive gear box, firmly clamped to valve shaft. End-limit Power Cut-off Dual microswitches for redundancy. Valve Data Type Ball segment valve (Somas) or ball section valve (MKE). Pressure Rating (counter flanges on pipe) Somas valves: PN 10 or ANSI 150 lb. (must be stated on order). MKE valves: PN 10 - 25

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Linear Characteristic Somas valve

MKE valve

Flow

100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

0° 10° 20° 30° 40° 50° 60° 70° 80° 90°

0° 10° 20° 30° 40° 50° 60° 70° 80° 90° Opening angle

Opening angle

Capacity Factors Table 1: Valve Size

Capacity factors for Somas valves Capacity Factor Kv (Cv = Kv/0.86) Opening Angle

Diameter mm (inch)

Kv 10°

Kv 20°

Kv 30°

Kv 40°

Kv 50°

Kv 60°

Kv 70°

Kv 80°

Kv 90°

40 (1.5)

4.3

11

19

29

39

53

66

84

96

40 (1.5) (ANSI 150)

4.3

11

19

29

39

53

66

84

96

50 (2)

4.3

11

19

29

39

53

66

84

96

50 (2) (ANSI 150)

6.8

17

30

45

61

82

103

131

150

65 (2.5)

9.8

25

43

65

87

113

139

171

191

65 (2.5) (ANSI 150)

9.8

25

43

65

87

113

139

171

191

80 (3)

15

39

67

102

138

184

231

295

340

80 (3) (ANSI 150)

15

39

67

102

138

184

231

295

340

100 (4)

23

58

101

154

208

276

348

444

510

150 (6)

43

109

189

288

390

519

652

817

925

200 (8)

66

167

288

439

594

790

994

1268

1450

250 (10)

97

245

425

646

875

1162

1463

1866

2150

300 (12)

219

552

959

1459

1977

2626

3303

4216

4850

350 (14)

308

780

1355

2058

2793

3708

4667

5952

6843

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D2024/2en

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Table 2: Valve Size

Power Consumption Maximum 60 VA

Capacity factors for MKE valves Capacity Factor Kv (Cv = Kv/0.86) Opening Angle

Process Specifications

Diameter mm (inch)

Kv 75°

Kv 90°

50 (1.5)

130

160

Media Temperature Somas valve: Maximum 150°C/302°F. MKE valve: Maximum 200°C/392°F

65 (2.5)

205

300

Ambient Temperature Maximum 60°C/121°F

80 (3)

280

410

100 (4)

390

570

150 (6)

675

990

200 (8)

1020

1500

250 (10)

1430

2100

Performance Specifications Actuator Resolution Better than 5000:1 for a pulse length of 0.05 s. See Fig 3. Backlash < 0.01° (< 25 ms), (including valve).

Electronics Unit

Start Friction (Stiction) Normally negligible. (Including valve).

Control In Auto from computer/controller, or in Manual from electronics unit. One potential-free contact indicates manual/auto. Necessity control by hand-wheel on motor.

Valve Pulse length, s

Input Signal Time duration pulsed signal output from QCS/controller. Standard alternatives: • Closing contacts (for controller use) •

Potential free closing contact, 24 VDC, min.50 mA. 24VDC supply from external source.

•

Open collector, 24 VDC, min. 50 mA. 24VDC supply from external source.

The input signal operation is solid state relays to operate the motor.

1

Output Signals 4 - 20 mA, limited to 20 mA. Two adjustable limit switches with potential free closing contacts. One MAN/Auto status indication with potential free closing contact.

2 3

Load Limitations Maximum 950 Ω at 20 mA output signal. The load dependency is negligible.

Resolution factor

Fig 3

Support System Specifications Power Supply Actuator Motor Supplied from standard electronics unit: 120 VAC, 50/60 Hz. Electronics Unit (Standard option) 230/115 VAC ± 10%, 50/60 Hz.

The graph shows the possible number of adjustments for the valve from closed to opened position (opening angle 0° to 90°). Valve travel times: 1 2 3

Customer Supplied Relay Box (non-standard option to replace std. electronics unit) Mains voltage for actuator motor must be specified at order. 120 VAC 60 Hz and 240 VAC 50 Hz motors available.

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Pulse duration dependency for the resolution at some different valve travel times, according to practical tests.

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260 s at 50 Hz / 217 s at 60 Hz -standard 131 s at 50 Hz / 109 s at 60 Hz -special option 78 s at 50Hz / 65 s at 60 Hz -special option

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Physical Specifications

Actuator Weight 16 kg (35.2 lbs)

Wetted Parts (Control valve) Valve Body Material Stainless steel to SS 2343 (corresponding to ASTM A351-78 Grade CF8M (AISI 316), W-stoff 1.4408).

Electronics Unit Enclosure Material Self-extinguishing thermoplastic type makrolon with transparent cover for wall mounting. Electronics Unit Degree of Protection IP 65 (corresponding to Nema 4X).

Ball Segment and Spindle Material Stainless steel to SS 2324 (corresponding to ASTM 329 W-stoff 1.4460)-hard-chromed. Seat Material Carbon-filled PTFE standard. PTFE 53 (stainless steel powder filled PTFE) and stellite as option. Stuffing Box Double seal, radial seal ring and glide ring of PTFE (size 150-350 mm). Standard PTFE packings (size 50-100 mm)

Electronics Unit Connection Cable Connection cable between basis weight valve and electronics unit, 10 x 0.5 mm² (equivalent to 10 x AWG 20), common shield. Approximate maximum length is 100 m/ 330' (not included in delivery). Electronics Unit Weights Electronics unit. 3.9 kg / 8.7 lbs Remote control unit. 1 kg / 2.2 lb Remote Control Unit Type: BTG VBW-10RC. Must be used together with ordinary electronics unit wich supplies the power. Mounting: In panel, only mounted in series. Weight: 1 kg / 2.2 lbs

Non-wetted Parts Actuator Degree of Protection IP 55. Actuator Material Housing of cast silumin, epoxypolurethane painted.

Dimensions Basis weight valve VBW-1000 A

B

Electronics unit (standard) 430 16.9”

196 7.7” 164 6.5"

175 7"

158 6.2"

Hig h Valve positi on %

Limi t

TY P E NO

III

N1619

50 / 60 Hz

FR E QUE NCY

INS TA LLA TI ON CAT E GOR Y

BT G Pulp & Paper Sensors A B Bo x 602 66129 Säffle SW EDEN www. btg.se

230 / 115 V

Max 60 VA

VBW-1000

VOL T AGE

AP P AR E NT P OWE R

Low

Open

158 6.2"

278 300 11.9" 12"

Close

Man

Auto

Power

o

Open

Close

Ind

On Fus e 2,5 T Off

C

210 8.3"

Electronics unit for panel mounting 220 8.6" ~110 4.3"

Remote control unit, type VBW-10RC - Panel mounted

192 6.5"

* Hig h

Valve positi on %

Limi t

TY P E NO

III

N1619

50 / 60 Hz

FR E QUE NCY

INS TA LLA TI ON CAT E GOR Y

BT G Pulp & Paper Sensors A B Bo x 602 66129 Säffle SW EDEN www. btg.se

230 / 115 V

Max 60 VA

VBW-1000

VOL T AGE

AP P AR E NT P OWE R

Low

*

Open

288 11.3"

315 12.4"

Close

Man

Auto

Power

Open

o

Close

Ind

On Fus e 2,5 T Off

®BTG Pulp & Paper Sensors AB

D2024/2en

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Table 3: Valve Size Diameter mm (inch)

Dimensions and weight for Somas ball segment valves Dimensions in mm (inch) (see fig above)

Free Throughput

Weight incl. Actuator

Weight Valve

Diameter mm (inch)

kg (lbs)

kg (lbs)

A

B

C

40 (1.5)

64 (2.6)

198 (7.8)

85 (3.4)

40 (1.6)

28 (62)

12 (24)

40 (1.5) (ANSI 150)

65 (2.6)

198 (7.8)

190 (7.5)

40 (1.6)

34 (75)

18 (40)

50 (2)

72 (2.8)

208 (8.2)

95 (3.7)

50 (2)

30 (66)

14 (31)

50 (2) (ANSI 150)

74 (2.8)

208 (8.2)

216 (8.5)

50 (2)

36 (79)

20 (44)

65 (2.5)

108 (4.3)

271 (10.7)

120 (4.7)

65 (2.6)

37 (82)

21 (46)

65 (2.5) (ANSI 150)

108 (4.3)

271 (10.7)

120 (4.7)

60 (2.4)

37 (82)

21 (46)

80 (3)

102 (4)

243 (9.6)

111 (4.4)

75 (3)

32 (70)

16 (35)

80 (3) (ANSI 150)

102 (4)

243 (9.6)

111 (4.4)

75 (3)

32 (70)

16 (35)

100 (4)

116 (4.5)

268 (10.6)

125 (4.9)

92 (3.6)

35 (77)

19 (42)

150 (6)

151 (5.9)

217 (8.5)

170 (6.7)

124 (4.9)

42 (93)

26 (57)

200 (8)

186 (7.3)

249 (9.8)

215 (8.5)

156 (6.1)

62 (137)

46 (101)

250 (10)

228 (9.0)

289 (11.4)

260 (10)

189 (11.4)

89 (196)

73 (161)

300 (12)

340 (13.4)

433 (17)

500 (19.7)

282 (11.1)

235 (518)

219 (483)

350 (14)

385 (15.2)

473 (18.6)

550 (21.7)

326 (12.8)

325 (717)

309 (681)

Free Throughput

Weight incl. Actuator

Weight Valve

Diameter mm (inch)

kg (lbs)

kg (lbs)

Table 4: Valve Size Diameter mm (inch)

Dimensions and weight for MKE ball section valves Dimensions in mm (inch) (see fig above) A

B

C

50 (2)

85 (3.3)

129 (5.1)

100 (4)

50 (2)

21 (46)

6 (13)

65 (2.5)

100 (4)

144 (5.7)

105 (4.1)

65 (2.5)

23 (51)

8 (18)

80 (3)

110 (4.3)

149 (5.9)

122 (4.8)

75 (3)

26 (57)

10 (22)

100 (4)

120 (4.7)

164 (6.5)

140 (5.5)

90 (3.5)

30 (66)

14 (31)

150 (6)

160 (6.3)

209 (8.2)

190 (7.5)

121 (4.8)

42 (93)

26 (57)

200 (8)

185 (7.3)

234 (9.2)

243 (9.6)

160 (6.3)

62 (137)

46 (101)

250 (10)

210 (8.3)

274 (10.8)

297 (11.7)

195 (7.7)

90 (198)

74 (163)

BTG reserves the right to make technical improvements without previous notice.

BTG Pulp & Paper Sensors AB Box 606, SE-661 29 Säffle Sweden P.6

Tel: +46 533 426 00 Fax: +46 533 125 00

[email protected] www.btg.com D2024/2en

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