Butterfly Valves

Series U

Cat: 16UCATR08-E

Rev: 08 08/2009

Specification N :

Accessory :

16UGENR06-E

Butterfly valves Series U

Title :

1 of 4
Revision N :

Features, range of types, assembly and operation

1.0

Page N :

06 25.08.09

Features, range of types, assembly and operation

This specification concerns the general features, the range of types, the assembly and the operation of the butterfly valves Series U. Admitted environmental and operating conditions depend
generally from the compatibility of the materials and components and from the surface finish. The
compatibility of the gasket material is indicated by specification N 16UGUARxx.

2.0

Function
The butterfly valve permits to shut-off an oil pipe in order to be able to change one defective component of the circuit without having to lover the oil level below the level of the component. If fitted
with an electrical contact, the butterfly valve shows is the pipeline is open or closed.

3.0

Construction features
Butterfly valves Series U consist mainly of a flange with a butterfly mounted in the flange's free
passage, opened and shut by a driving shaft. The driving shaft has an hexagonal end protruding
from the flange in order to be turned by a spanner for opening or closing the butterfly.
A sealing cap protects the hexagonal end of the shaft when in service, assuring the oil tightness
and showing the position of the butterfly; the sealing cap can be padlocked in order to avoid undue
operation of the butterfly.

3.1.0
3.1.1.0

Materials
Standard execution

Pressed steel flange or, for the bigger diameters oxycut or Cr-Mo cast iron flange;

Driving shaft and countershaft of galvanised steel;

Sealing cap and position plate of glassfiber reinforced nylon;

Butterfly of sheet steel;

External screws and washers of stainless steel.

For the gasket material see specification N 16UGUARxx.
3.1.2.0 Special executions

Flange made of steel for low temperatures, stainless steel, aluminium, brass or bronze;

Driving shaft and countershaft of stainless steel or brass;

Butterfly of stainless steel or brass;

Operation of the driving shaft by lever;

Electrical contact indicating the open or shut position of the butterfly.

Special executions may require production tools not already available for all types.
3.2.0

Surface protection

The butterfly valves Series U can be supplied with one of the following surface protection treatments. Specification N 00VERRxx shows the detailed characteristics of the painting procedure.
3.2.1.0 Execution NOR
External non-machined surfaces rough as per hot pressing or oxycut, sandblasted and slightly
oiled; machined surfaces, butterfly and butterfly seat slightly oiled.
3.2.2.0 Execution WAS
Valve flange protected up to nominal diameter by one coat of 2-pack epoxy primer paint, thickness 50 mu; butterfly and butterfly seat slightly oiled.

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Specification N :

Accessory :

16UGENR06-E

Butterfly valves Series U

Page N :

2 of 4

Title :

Revision N :

Features, range of types, assembly and operation

3.2.3.0

3.2.4.0

3.2.5.0

06 25.08.09

Execution BCR
Valve flange, including butterfly seat, electro-galvanised and tropicalised thickness 10 mu; butterfly and butterfly seat slightly oiled.
Execution EPX
Valve flange protected as per execution WAS, then painted up to gasket seat with 2-pack polyurethane paint, colour RAL 7031; total paint thickness 110 mu; butterfly and butterfly seat slightly
oiled. For consistent quantities other final colours may be supplied. This protection withstands
the test of 500 hours in salty fog.
Execution BCR+EPX
This surface finish is a combination of executions BCR and EPX, designed in order to assure the
maximum protection against corrosion of the valve flange.

4.0

Operating features

4.1.0

Tightness of drive shaft

The tightness to oil leakage from the shaft on the butterfly valve mounted as in service, complete
with cap, is guaranteed by a gasket mounted into a seat on the cap and pressed against the machined upper part of the valve flange. This allows to obtain an excellent tightness and at the same
time to exchange the gasket easily.
When the cap is not in place, an O-Ring gasket on the shaft avoids excessive leakage.
No leakage is tolerated from drive shaft in service, with the cap in place.

4.2.0

Tightness of butterfly
The oil tightness of the butterfly is obtained by contact metal to metal, fitting butterfly to seat at assembly; thus a constant performance even after a long use is assured.
Leakage at the butterfly is tested at assembly with oil at 20 C, 1 bar and viscosity of 30,5 cSt.
Following values for leakage are tolerated, measured in 1 hour:

4.3.0

Nominal diameter of valve in mm

<= 100

>100 - <=175

>175

Admitted leakage in dm3/h measured in 1 hour

<= 0,5

<= 1,0

<= 2,0

Operating Torque
The operating torque measured by dynamometric spanner should not exceed following values:
Nominal diameter of valve in mm
Operating torque in Kgm.
Closing torque in Kgm.
Opening torque in Kgm.

<= 100
<= 1
<= 5
<= 3

>100 - <=150
<= 3
<= 10
<= 5

Operating torque:
Torque necessary to turn the shaft from the open to the closed position;
Closing torque:
Torque necessary to obtain the complete closure of the valve;
Opening torque:
Torque necessary to open the valve, after complete closure.

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>150
<= 3
<= 15
<= 5

Specification N :

Accessory :

16UGENR06-E

Butterfly valves Series U

Title :

Page N :

3 of 4
Revision N :

Features, range of types, assembly and operation

5.0

Assembling and operating instructions

5.1.0

Assembling instructions

06 25.08.09

The drawings referred to in chapter 6.0 as well as the table showing the gasket seat dimensions in
specification N 16UGUARxx give overall and mounting dimensions as well as dimensions and
references of the mounting gasket.
Assembly of the different type of valves is done as shown in drawings N 16.APP/1 and 16.APP/2.
Valves may be installed with the drive shaft in any position, vertical, horizontal or angled.
Protection 8 of drawing N 16.U/1 is present on all valves to protect the inscription plate 6 during
sandblasting and painting; in service it has to be eliminated
5.2.0

Operating instructions
Numbering of parts refers to drawing N 16.U/1.
The design of the operating system is common to all valves Series U; to open and close the valve
operate as follows:

The symbol or inscription on plate 6 indicates the valve position; the arrow on sealing cap 3
indicate in which direction drive shaft 5 has to be turned in order to open or close the valve;

To close the valve first remove the seal or padlock 1 if present, then unscrew and remove the
screws and washers 2 holding the sealing cap 3 in place;

Remove the sealing cap 3 and its gasket 4; the drive shaft 5 is now accessible and the crest
5.1 indicates the position of the butterfly. A second gasket on the drive shaft hinders excessive
oil leaks;

With the appropriate spanner turn the drive shaft 5 clockwise 90 to close the valve; crest 5.1
now indicates that the valve is closed;

Check integrity of gasket 4 and change it if necessary, then reassemble the sealing cap 3, after having turned it 180 on it's vertical axis;

Fasten cap 3 with it's screws and washers 2; the symbol or inscription on plate 6 indicates
now that the valve is closed;

Padlock or seal the valve if necessary.

To open the valve proceed the same way but turn the drive shaft 5 counter-clockwise.
Should the valve have been closed by fault in the wrong direction (counter-clockwise), crest
5.1 hinders to reassemble cap 3. Also, if the closing torque exceeds the maximum value, pin
7 hinders the butterfly to travel over the position of maximum tightness.

5.3.0

Changing the cap gasket

Oil tightness of the drive shaft is made by O-Ring gasket 4; should a leakage occur, check the surface on which the gasket is pressed as well as the gasket itself and make the necessary adjustments and/or change the gasket.

6.0

Range of types and reference drawings

The butterfly valves Series U have in standard execution flanges according to UNI PN10; flanges
according to other standards can be supplied as special execution.
Nominal diameters (MD) range from 25 mm to 400 mm in steps of 25 mm up to MD 200 mm and of
50 mm above MD 200. Not all series can be supplied in all nominal diameters; see table below.

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Specification N :

Accessory :

16UGENR06-E

Butterfly valves Series U

Page N :

4 of 4

Title :

Revision N :

Features, range of types, assembly and operation

6.1.0

06 25.08.09

Butterfly valves Series U in standard execution

Series

Description

DN

Ref. dwg

Assembly
dwg

Butterfly valves with gasket seat

JUZ

Circular wafer with threaded holes and gasket seats

25 to 80
125 to 400

16.JUZ

16.APP/3

RUZ

Circular wafer with threaded holes and gasket seat,

flange with recesses

25 to 100

16.RUZ

16.APP/3

SUZ

Circular wafer with flush holes and gasket seats, recessed flange

50 to 300

16.SUZ

16.APP/2

PUWZ

Square flange with threaded holes and gasket seats

50 to 100

16.PUWZ

16.APP/3

WUPZ

Recessed square flange with flush holes and gasket

seats

80 - 100

QUZ16.080.00
WUPZ16.100.00

16.APP/2

WUZ

Square flange, weld on type with short neck, with gasket

seats and flush or threaded holes

50 - 80

16.WUZ/WUTZ

16.APP/1

WUTZ

Square flange, weld on type with long neck, with gasket

seats and flush or threaded holes

80

16.WUZ/WUTZ

16.APP/1

Butterfly valves without gasket seat

6.2.0

JUX

Circular wafer with threaded holes, without gasket seats

25 to 80
125 to 400

16.JUX

16.APP/3

SUX

Circular wafer with flush holes and without gasket seats,

recessed flange

50 to 300

16.SU

16.APP/2

PUX

Square flange with threaded holes, without gasket seats

80

16.PUX

16.APP/3

Special executions
To meet special demands, valves with different executions can be supplied with:

flange dimensions to other standards and/or with special machining;

aluminium body for lower weight;

all or some parts of the valve made of stainless steel or brass;

lever to open or close the valve;

special gaskets;

special indication on position plate;

significantly lower oil leakage values from closed butterfly than indicated at point 4.2.0

7.0

Reference specifications

Gaskets, gasket seats and operating conditions

Painting

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N 16UGUARxx
N 00VERRxx

Specification N :

16UGUAR05-E

Accessory :

Page N :

Butterfly valves Series U

1 of 3

Title :

Revision N :

Dimensions and types of gaskets, dimensions of gasket seats

1.0

05 25/07/06

Dimensions and types of gaskets, dimensions of flange gasket seats

This specification indicates the dimensions and types of gaskets as well as the dimensions of the gasket seats and the admitted operating conditions depending on the gasket material. The gaskets are
colour coded in order to avoid confusion.

2.0

Admitted operating conditions

2.1.0

Standard execution NBR Nitrile rubber

2.2.0

Colour code
Black
Ambient conditions:
Ambient temperature
-25C to +50C
Relative humidity
95% to 20C - 80% to 40C - 50% to 50C

Insulating liquid and it's temperature:

Mineral oil
-25C to +110C
Silicone oil
-25C to +110C
Execution Nf HNBR Nitrile rubber for low temperature

2.3.0

Colour code
Ambient conditions:
Ambient temperature
Relative humidity

Insulating liquid and it's temperature:

Mineral oil
Silicone oil
Execution Sl SI Silicone rubber

2.4.0

Colour code
Ambient conditions:
Ambient temperature
Relative humidity

Insulating liquid and it's temperature:

Mineral oil
Silicone oil
Execution Vt FPM Fluorocarbon-rubber (Viton V)

Colour code
Ambient conditions:
Ambient temperature
Relative humidity
Insulating liquid and it's temperature:
Mineral oil
Silicone oil

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Military green RAL 6016

-45C to +50C
95% to 20C - 80% to 40C - 50% to 50C
-45C to +110C
-45C to +110C
Red
-60C to +50C
95% to 20C - 80% to 40C - 50% to 50C
-60C to +150C
not admitted
Green
-15C to +50C
95% to 20C - 80% to 40C - 50% to 50C
-15C to +150C
-15C to +150C

Specification N :

Accessory :

16UGUAR05-E

Page N :

Butterfly valves Series U

2 of 3

Title :

Revision N :

Dimensions and types of gaskets, dimensions of gasket seats

05 25/07/06

3.0

Tables of gasket types and flange gasket seats and dimensions

3.1.0

Gaskets are according to Italian (OR), British (BS) and French (R) standard.
Flange gasket seats are designed with uniform criteria:

gaskets are centred on the external diameter of the gasket seat with a play of 0,5 to 1,0 mm;

radial compression of the gasket is between 32% and 33%;

seat cross section is 12% to 16% bigger then gasket cross section;

seat volume is 11% to 15% bigger then gasket volume.

Table 1 - Butterfly valves Series SUZ - WUPZ
Measures in mm.
Flange gaskets
MD

Cap and plug gasket

O-Ring gasket
Seat

25

34,7 x 48,7 x 3,6

50

70,0 x 84,0 x 3,6

65

76,0 x 90,0 x 3,6

80

98,5 x 112,5 x 3,6

100

115,7 x 134,5 x 4,7

125

141,5 x 160,3 x 4,7

150

167,0 x 185,8 x 4,7

175

186,0 x 204,8 x 4,7

200

211,5 x 230,3 x 4,7

250

275,0 x 293,8 x 4,7

300

325,5 x 344,3 x 4,7

Notes

O-Ring gasket

OR6150 BS325

Dimensions
int x cord x ext
37,47x5,34x48,15

R28

37,47x5,33x48,13

OR6287 BS332

72,39x5,34x83,07

R39

72,39x5,33x83,05

OR6312 BS338

78,74x5,34x89,42

R41

78,74x5,33x89,40

OR6400 BS345

101,00x5,34x111,68

R48

100,97x5,33x111,65

OR8475 BS427

120,00x6,99X133,98

R55

120,02x6,99X134,00

OR8575 BS435

145,40x6,99x159,38

OR146

41,28x3,53

R63

145,42x6,99x159,40

OR4087

21,82x3,53

OR8675 BS440

170,80x6,99x184,78

OR146

41,28x3,53

R68

170,82x6,99x184,80

OR4087

21,82x3,53

OR8750 BS443

189,90x6,99x203,88

OR146

41,28x3,53

References

Ref.

Dimensions
int. x cord

OR4112

28,17x3,53

OR4112

28,17x3,53

OR4112

28,17x3,53

1-2

OR4112

28,17x3,53

OR4112

28,17x3,53

R71

189,87x6,99x203,85

OR4087

21,82x3,53

OR8850 BS446

215,30x6,99x229,28

OR146

41,28x3,53

R74

215,27x6,99x229,25

OR4087

21,82x3,53

OR81100 BS451

278,70x6,99x292,68

OR146

41,28x3,53

R79

278,77x6,99x292,75

OR4087

21,82x3,53

OR81300 BS455

329,50x6,99x343,48

OR162

58,74x3,53

R83

329,57x6,99x343,55

OR4087

21,82x3,53

Notes:
1 = MD to be avoided
2 = Cap gasket

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3 = Countershaft plug gasket

Specification N :

Accessory :

16UGUAR05-E

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Butterfly valves Series U

3 of 3

Title :

Revision N :

Dimensions and types of gaskets, dimensions of gasket seats

3.2.0

05 25/07/06

Table 2 - Butterfly valves Series JUZ RUZ PUWZ WUZ - WUTZ

Gasket seats are designed to be compatible with ISO PN 10 slip on flanges
Measures in mm.
Flange gaskets
MD

Cap and plug gasket

O-Ring gasket
Seat

25

44,2 x 58,2 x 3,6

50

70,0 x 84,0 x 3,6

65

85,5 x 99,5 x 3,6

80

98,5 x 112,5 x 3,6

100

128,5 x 147,3 x 4,7

125

154,2 x 173,0 x 4,7

150

186,0 x 204,8 x 4,7

175

211,5 x 230,3 x 4,7

200

237,0 x 255,8 x 4,7

250

287,5 x 306,3 x 4,7

300

338,5 x 357,3 x 4,7

Notes

O-Ring gasket

OR6187 BS328

Dimensions
int x cord x ext
47,00x5,34x57,68

R31

46,99x5,33x57,65

OR6287 BS332

72,39x5,34x83,07

R39

72,39x5,33x83,05

OR6350 BS341

88,27x5,34X98,95

R44

88,27x5,33X98,93

OR6400 BS345

101,00x5,34x111,68

R48

100,97x5,33x111,65

OR8525 BS431

132,70x6,99x146,68

R59

132,72x6,99x146,70

OR8625 BS438

158,10x6,99x172,10

OR146

41,28x3,53

R66

158,12x6,99x172,108

OR4087

21,82x3,53

OR8750 BS443

189,90x6,99x203,88

OR146

41,28x3,53

References

Ref.

Dimensions
int. x cord

OR4112

28,17x3,53

OR4112

28,17x3,53

OR4112

28,17x3,53

1-2

OR4112

28,17x3,53

OR4112

28,17x3,53

R71

189,87x6,99x203,85

OR4087

21,82x3,53

OR8850 BS446

215,30x6,99x229,28

OR146

41,28x3,53

R74

215,27x6,99x229,25

OR4087

21,82x3,53

OR8950 BS448

240,70x6,99x254,68

OR146

41,28x3,53

R76

240,67x6,99x254,65

OR4087

21,82x3,53

OR81150 BS452

291,50x6,99x305,48

OR146

41,28x3,53

R80

291,47x6,99x305,45

OR4087

21,82x3,53

OR81350 - BS456

342,30x6,99x356,28

OR162

58,74x3,53

R84

342,27x6,99x356,25

OR4087

21,82x3,53

Notes:
1 = MD to be avoided
2 = Cap gasket

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3 = Countershaft plug gasket