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HG7- BK

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Description

Double eccentric high performance lug type butterfly valve
The insert ring is screwed on pressure-resistant.
Butterfly valve can be flanged on both sides.
The max. operating pressure is to be observed.

Installation between flanges DIN EN 1092-1, PN 10 – PN 40, ANSI 150/300

GEFA-MULTITOP
Automation system
Exchangeable flange for direct mounting of actuators

Approvals

  • Production monitored by TÜV WO/TRD 100
  • TA-Luft - Stem sealing based on the new VDI 2440 directive
  • Firesafe approval according to BS 6755, part 2
  • CE identification complies with the safety standards of the
    European pressure equipment directive PED 97/23/EC
  • GOST-R Certificate for the Russian Federation
  • Pressure test:
    DIN EN12266-1, P10/P11/P12-A
    DIN 3230,T3 – BA/BO-1, DIN3230,T5,T6
  • Approvals:
    Germanischer Lloyd, Lloyd´s Register of Shipping, Det Norske Veritas (DNV)

Product features

On the numbered markings you receive further information      

1. Safety (Option: TA-Luft)

Shaft sealing The tension can be increased beneath the mounting flange, thus the shaft sealing is adjustable without dismounting the actuator

2. Automation

GEFA-MULTITOP Automation system
  • Standard mounting flange acc. to DIN 3337
  • Direct mounting of actuator without interrupting the stem
  • Variable and exchangeable for any actuator size

3. Long service life

The insert ring of the body efficiently protects the seat from the direct medium flow and prevents wear such as erosion and abrasion

4. Reliability

The double eccentric principle with spherical sealing surface at the disc allows operation with a minimum of wear and offers at the same time the highest level of tightness and lowest torques

5. Exact and variable installation

Face-to-face dimension: DIN 558-1, line 20/25/16 (DIN 3202-K1/K2/K3) Option: execution with Groove/Spring - construction acc. DIN 2512

6. Precise mounting

Easy mounting due to body location holes for all standard flanges

7. Easy service

The axial centering of the shaft can be easily reached and is prepared for later service works

8. Rational and safe

The cylindrical screws fix the mounting flange without transferring torques (driving torques)

9. Guarantee a free of play connection

  • The clamping sleeves transfer the driving torques and guarantee a free of play connection between the mounting flange and the body

Torque chart

 

PTFE seat

Metal seat

DN

NPS

kvs

Δp

10 bar

(Nm)

Δp

16 bar

(Nm)

Δp

25 bar

(Nm)

Δp

10 bar

(Nm)

Δp

16 bar

(Nm)

Δp

25 bar

(Nm)

50

2"

79

53

55

59

70

72

73

65

2½"

130

53

55

59

70

72

73

80

3"

225

55

60

66

78

80

86

100

4"

395

70

77

88

92

97

106

125

5"

655

93

104

130

131

143

156

150

6"

990

131

144

181

179

196

214

200

8"

1810

204

224

280

256

281

318

250

10"

2760

290

319

398

340

378

433

300

12"

4050

418

535

685

536

681

854

350

14"

5000

627

819

-

873

1219

-

400

16"

6900

943

1252

-

1316

1851

-

500

20"

12000

1461

1986

-

2044

2818

-

600

24"

18000

2282

-

-

3219

-

-

Product advantages

Easy and exact installation
Due to body location holes for all standard flanges

Easy service
The axial centering of the shaft can be easily reached and is prepared for later service works

The seat is easily accessible, if replacement is necessary only the insert ring needs to be removed, resulting in short repair time

Excellent tightness
With increasing differential pressure the contact pressure of the seat against the spherical sealing area of the disc is increased. The sealing function gets higher with rising differential pressure and ensures absolute tightness at lowest differential pressures up to PN 40 / PN 63

Safety (TA-Luft option)
The shaft sealing can be retightened and is located below the mounting flange, thus adjustment is possible without dismounting the actuator. Also certified for use with oxygen.

Reliability
The double eccentric principle with spherical sealing surface at the disc allows operation with a minimum of wear and offers at the same time the highest level of tightness and lowest torques

The double-eccentric principle
Due to the double displacement of the shaft the disc is raised up from the seat at the beginning of the opening movement. The seat is then free from heavy pressure over the whole circumference, this means that 90° turning is frictionless at even reduced torques.

Extremely long service life
The insert ring of the body protects the seat efficiently against the medium and prevents wear such as erosion and abrasion

Economic and easy automation
The standard mounting flange according to DIN 3337 allows mounting of the actuator without interrupting the stem, thus no additional hysteresis occurs  

Application range

Industries and applications

  • Water / Sewage

  • Engineering

  • Food industry

  • Chemical, petrochemical

  • and pharmaceutical industry

  • Colouring, Varnish, Dyeing factories

Technical Data

High performance valve with lugs for use as flanged valve

The insert ring is screwed pressure-resistant.
The valve can be flanged on both sides.
Maximum working pressures is to be observed

Installation between flanges DIN EN 1092-1, PN 10 – PN 40, ANSI 150 lbs/300

Nominal sizes:
DN 50 – DN 600

Pressure class
please refer to security advice - Download Data Sheets documentation

Face-to-face dimension:
DIN 3202 - K1 (K2 / K3)
EN 558 T1 - line 20 (25 / 16)

Control range:
10° -90° opening angle
15° - 70° linear characteristic

Top flange:
DIN 3337 - ISO 5211
GEFA-MULTITOP Automation system

Options

  • TA-Luft

  • Pressure ranges: PN 40/PN 63

  • Special materials

  • Throttle valve cavity-free

  • O-ring sealing for bearing and shaft guidance

  • 3-way combination

  • Firesafe

  • Low-temperature application

  • Different seat materials for extreme applications

The Seat System

R-PTFE seat

Highly flexible design - chemically almost unlimited resistance. Pressure stable due to glass fibre contend, also at high temperatures.
Tightness: DIN 3230, Part 3/BO-1

Metal seat

Very good resilience through special molding, high temperature resistance due to seat ring construction made off: 1.4571 nitrated sealing: DIN 3230, part 3/BO-2

The double eccentric concept provides reliable, almost wear free sealing. The dual shifting of the torque enables the valve disc to lift itself up at the beginning of the opening movement of the seat. The recommended flow direction (arrow signs on the body) guarantees absolute tightness. The differential pressure of the medium also supports the sealing function through the pressure effect of the seat against the seal face of the disc.The seat ring, being a functional part, is easily accessible and in this way very maintenance friendly. It can be quickly changed on-site without using special tools. 
 

Materials

Descrition
HG ... 4466 TG
HG ... 6666 TG
max. working temperature + 220 °C + 220 °C
Body GS-C 25 1.4408
Disc 1.4408 1.4408
Stem 1.4571 1.4571
* Seat PTFE/Glass PTFE/Glass
Bearing 1.4401/PTFE 1.4401/PTFE
* Packing PTFE PTFE
Insert ring C-Steel 1.4571
 
 
Descrition
HG ... 4466 M
HG ... 6666 M
max. working temperature + 220 °C + 220 °C
Body GS-C 25 1.4408
Disc 1.4408 / nitrated 1.4408 / nitrated
Stem 1.4571 1.4571
* Seat 1.4571 / nitrated 1.4571 / nitrated
Bearing 1.4401/PTFE 1.4401/PTFE
* Packing PTFE PTFE
Insert ring C-Steel 1.4571
 
 
Descrition
HG ... 4466 HM
HG ... 6666 HM
max. working temperature + 450 °C + 450 °C
Body GS-C 25 1.4408
Disc 1.4408 / nitrated 1.4408 / nitrated
Stem 1.4571 1.4571
* Seat 1.4571 / nitrated 1.4571 / nitrated
Bearing 1.4571 / nitrated 1.4571 / nitrated
* Packing Graphite Graphite
Insert ring C-Steel 1.4571
 
 


* Spare parts/ wearing parts

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